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Diffstat (limited to '')
| -rw-r--r-- | utils/update-alternatives.c | 2870 |
1 files changed, 2870 insertions, 0 deletions
diff --git a/utils/update-alternatives.c b/utils/update-alternatives.c new file mode 100644 index 0000000..a57e970 --- /dev/null +++ b/utils/update-alternatives.c @@ -0,0 +1,2870 @@ +/* + * update-alternatives + * + * Copyright © 1995 Ian Jackson <ijackson@chiark.greenend.org.uk> + * Copyright © 2000-2002 Wichert Akkerman <wakkerma@debian.org> + * Copyright © 2006-2017 Guillem Jover <guillem@debian.org> + * Copyright © 2008 Pierre Habouzit <madcoder@debian.org> + * Copyright © 2009-2010 Raphaël Hertzog <hertzog@debian.org> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see <https://www.gnu.org/licenses/>. + */ + +#include <config.h> +#include <compat.h> + +#include <sys/types.h> +#include <sys/stat.h> +#include <sys/wait.h> + +#include <errno.h> +#include <stdarg.h> +#include <stdbool.h> +#include <stdlib.h> +#include <stdio.h> +#include <unistd.h> +#include <string.h> +#include <dirent.h> +#include <time.h> +#include <setjmp.h> +#include <assert.h> +#include <locale.h> +#include <ctype.h> +#include <limits.h> + +#include <dpkg/macros.h> +#include <dpkg/i18n.h> + +/* Global variables: */ + +#define PROGNAME "update-alternatives" + +static const char *altdir = SYSCONFDIR "/alternatives"; +static const char *admdir; + +static const char *prog_path = "update-alternatives"; + +enum action { + ACTION_NONE, + ACTION_INSTALL, + ACTION_SET, + ACTION_SET_SELECTIONS, + ACTION_GET_SELECTIONS, + ACTION_AUTO, + ACTION_CONFIG, + ACTION_CONFIG_ALL, + ACTION_REMOVE, + ACTION_REMOVE_ALL, + ACTION_LIST, + ACTION_QUERY, + ACTION_DISPLAY, +}; + +struct action_name { + enum action action; + const char *name; +} action_names[] = { + { ACTION_NONE, "" }, + { ACTION_INSTALL, "install" }, + { ACTION_SET, "set" }, + { ACTION_SET_SELECTIONS, "set-selections" }, + { ACTION_GET_SELECTIONS, "get-selections" }, + { ACTION_AUTO, "auto" }, + { ACTION_CONFIG, "config" }, + { ACTION_CONFIG_ALL, "all" }, + { ACTION_REMOVE, "remove" }, + { ACTION_REMOVE_ALL, "remove-all" }, + { ACTION_LIST, "list" }, + { ACTION_QUERY, "query" }, + { ACTION_DISPLAY, "display" }, +}; + +enum output_mode { + OUTPUT_QUIET = -1, + OUTPUT_NORMAL = 0, + OUTPUT_VERBOSE = 1, + OUTPUT_DEBUG = 2, +}; + +/* Action to perform */ +static enum action action = ACTION_NONE; +static const char *log_file = LOGDIR "/alternatives.log"; +/* Skip alternatives properly configured in auto mode (for --config) */ +static int opt_skip_auto = 0; +static int opt_verbose = OUTPUT_NORMAL; +static int opt_force = 0; + +/* + * Functions. + */ + +static void +version(void) +{ + printf(_("Debian %s version %s.\n"), PROGNAME, VERSION); + printf("\n"); + + printf(_( +"This is free software; see the GNU General Public License version 2 or\n" +"later for copying conditions. There is NO warranty.\n")); +} + +static void +usage(void) +{ + printf(_( +"Usage: %s [<option> ...] <command>\n" +"\n"), PROGNAME); + + printf(_( +"Commands:\n" +" --install <link> <name> <path> <priority>\n" +" [--slave <link> <name> <path>] ...\n" +" add a group of alternatives to the system.\n" +" --remove <name> <path> remove <path> from the <name> group alternative.\n" +" --remove-all <name> remove <name> group from the alternatives system.\n" +" --auto <name> switch the master link <name> to automatic mode.\n" +" --display <name> display information about the <name> group.\n" +" --query <name> machine parseable version of --display <name>.\n" +" --list <name> display all targets of the <name> group.\n" +" --get-selections list master alternative names and their status.\n" +" --set-selections read alternative status from standard input.\n" +" --config <name> show alternatives for the <name> group and ask the\n" +" user to select which one to use.\n" +" --set <name> <path> set <path> as alternative for <name>.\n" +" --all call --config on all alternatives.\n" +"\n")); + + printf(_( +"<link> is the symlink pointing to %s/<name>.\n" +" (e.g. /usr/bin/pager)\n" +"<name> is the master name for this link group.\n" +" (e.g. pager)\n" +"<path> is the location of one of the alternative target files.\n" +" (e.g. /usr/bin/less)\n" +"<priority> is an integer; options with higher numbers have higher priority in\n" +" automatic mode.\n" +"\n"), altdir); + + printf(_( +"Options:\n" +" --altdir <directory> change the alternatives directory.\n" +" --admindir <directory> change the administrative directory.\n" +" --log <file> change the log file.\n" +" --force allow replacing files with alternative links.\n" +" --skip-auto skip prompt for alternatives correctly configured\n" +" in automatic mode (relevant for --config only)\n" +" --quiet quiet operation, minimal output.\n" +" --verbose verbose operation, more output.\n" +" --debug debug output, way more output.\n" +" --help show this help message.\n" +" --version show the version.\n" +)); +} + +static void DPKG_ATTR_NORET DPKG_ATTR_PRINTF(1) +error(char const *fmt, ...) +{ + va_list args; + + fprintf(stderr, "%s: %s: ", PROGNAME, _("error")); + va_start(args, fmt); + vfprintf(stderr, fmt, args); + va_end(args); + fprintf(stderr, "\n"); + exit(2); +} + +static void DPKG_ATTR_NORET DPKG_ATTR_PRINTF(1) +syserr(char const *fmt, ...) +{ + va_list args; + + fprintf(stderr, "%s: %s: ", PROGNAME, _("error")); + va_start(args, fmt); + vfprintf(stderr, fmt, args); + va_end(args); + fprintf(stderr, ": %s\n", strerror(errno)); + exit(2); +} + +static void DPKG_ATTR_NORET DPKG_ATTR_PRINTF(1) +badusage(char const *fmt, ...) +{ + va_list args; + + fprintf(stderr, "%s: ", PROGNAME); + va_start(args, fmt); + vfprintf(stderr, fmt, args); + va_end(args); + fprintf(stderr, "\n\n"); + fprintf(stderr, _("Use '%s --help' for program usage information."), + PROGNAME); + fprintf(stderr, "\n"); + exit(2); +} + +static void DPKG_ATTR_PRINTF(1) +warning(char const *fmt, ...) +{ + va_list args; + + if (opt_verbose < OUTPUT_NORMAL) + return; + + fprintf(stderr, "%s: %s: ", PROGNAME, _("warning")); + va_start(args, fmt); + vfprintf(stderr, fmt, args); + va_end(args); + fprintf(stderr, "\n"); +} + +static void DPKG_ATTR_PRINTF(1) +debug(char const *fmt, ...) +{ + va_list args; + + if (opt_verbose < OUTPUT_DEBUG) + return; + + fprintf(stderr, "DEBUG: "); + va_start(args, fmt); + vfprintf(stderr, fmt, args); + va_end(args); + fprintf(stderr, "\n"); +} + +static void DPKG_ATTR_PRINTF(1) +verbose(char const *fmt, ...) +{ + va_list args; + + if (opt_verbose < OUTPUT_VERBOSE) + return; + + printf("%s: ", PROGNAME); + va_start(args, fmt); + vprintf(fmt, args); + va_end(args); + printf("\n"); +} + +static void DPKG_ATTR_PRINTF(1) +info(char const *fmt, ...) +{ + va_list args; + + if (opt_verbose < OUTPUT_NORMAL) + return; + + printf("%s: ", PROGNAME); + va_start(args, fmt); + vprintf(fmt, args); + va_end(args); + printf("\n"); +} + +static void DPKG_ATTR_PRINTF(1) +pr(char const *fmt, ...) +{ + va_list args; + + va_start(args, fmt); + vprintf(fmt, args); + va_end(args); + printf("\n"); +} + +static void * +xmalloc(size_t size) +{ + void *ptr; + + ptr = malloc(size); + if (!ptr) + error(_("malloc failed (%zu bytes)"), size); + + return ptr; +} + +static char * +xstrdup(const char *str) +{ + char *new_str; + + if (!str) + return NULL; + + new_str = strdup(str); + if (!new_str) + error(_("failed to allocate memory")); + + return new_str; +} + +static char * DPKG_ATTR_VPRINTF(1) +xvasprintf(const char *fmt, va_list args) +{ + char *str; + + if (vasprintf(&str, fmt, args) < 0) + error(_("failed to allocate memory")); + + return str; +} + +static char * DPKG_ATTR_PRINTF(1) +xasprintf(const char *fmt, ...) +{ + va_list args; + char *str; + + va_start(args, fmt); + str = xvasprintf(fmt, args); + va_end(args); + + return str; +} + +static char * +areadlink(const char *linkname) +{ + struct stat st; + char *buf; + ssize_t size; + + /* Allocate required memory to store the value of the symlink */ + if (lstat(linkname, &st)) + return NULL; + + if (!S_ISLNK(st.st_mode)) { + errno = EINVAL; + return NULL; + } + + buf = xmalloc(st.st_size + 1); + + /* Read it and terminate the string properly */ + size = readlink(linkname, buf, st.st_size); + if (size == -1) { + int saved_errno = errno; + + free(buf); + errno = saved_errno; + + return NULL; + } + buf[size] = '\0'; + + return buf; +} + +static char * +xreadlink(const char *linkname) +{ + char *buf; + + buf = areadlink(linkname); + if (buf == NULL) + syserr(_("unable to read link '%.255s'"), linkname); + + return buf; +} + +static bool +pathname_is_missing(const char *pathname) +{ + struct stat st; + + errno = 0; + if (stat(pathname, &st) == 0) + return false; + + if (errno == ENOENT) + return true; + + syserr(_("cannot stat file '%s'"), pathname); +} + +static void +set_action(enum action new_action) +{ + if (action) + badusage(_("two commands specified: --%s and --%s"), + action_names[action].name, action_names[new_action].name); + action = new_action; +} + +static void +set_action_from_name(const char *new_action) +{ + size_t i; + + for (i = 0; i < array_count(action_names); i++) { + if (strcmp(new_action, action_names[i].name) == 0) { + set_action(action_names[i].action); + return; + } + } + + assert(!"unknown action name"); +} + +static const char * +admindir_init(void) +{ + const char *basedir, *basedir_env; + + /* Try to get the admindir from an environment variable, usually set + * by the system package manager. */ + basedir_env = getenv(ADMINDIR_ENVVAR); + if (basedir_env) + basedir = basedir_env; + else + basedir = ADMINDIR; + + return xasprintf("%s/%s", basedir, "alternatives"); +} + +static FILE *fh_log = NULL; + +static void DPKG_ATTR_PRINTF(1) +log_msg(const char *fmt, ...) +{ + va_list args; + + if (fh_log == NULL) { + fh_log = fopen(log_file, "a"); + if (fh_log == NULL && errno != EACCES) + syserr(_("cannot append to '%s'"), log_file); + } + + if (fh_log) { + char timestamp[64]; + time_t now; + + time(&now); + strftime(timestamp, sizeof(timestamp), "%Y-%m-%d %H:%M:%S", + localtime(&now)); + fprintf(fh_log, "%s %s: ", PROGNAME, timestamp); + va_start(args, fmt); + vfprintf(fh_log, fmt, args); + va_end(args); + fprintf(fh_log, "\n"); + } +} + +static int +spawn(const char *prog, const char *args[]) +{ + pid_t pid, dead_pid; + int status; + + pid = fork(); + if (pid == -1) + error(_("fork failed")); + if (pid == 0) { + execvp(prog, (char *const *)args); + syserr(_("unable to execute %s (%s)"), prog, prog); + } + while ((dead_pid = waitpid(pid, &status, 0)) == -1 && errno == EINTR) ; + if (dead_pid != pid) + error(_("wait for subprocess %s failed"), prog); + + return status; +} + +static bool +rename_mv(const char *src, const char *dst) +{ + const char *args[] = { "mv", src, dst, NULL }; + int rc; + + if (rename(src, dst) == 0) + return true; + if (errno == ENOENT) + return false; + + rc = spawn("mv", args); + if (WIFEXITED(rc) && WEXITSTATUS(rc) == 0) + return true; + + return false; +} + +static void +checked_symlink(const char *filename, const char *linkname) +{ + if (symlink(filename, linkname)) + syserr(_("error creating symbolic link '%.255s'"), linkname); +} + +static void +checked_mv(const char *src, const char *dst) +{ + if (!rename_mv(src, dst)) + syserr(_("unable to install '%.250s' as '%.250s'"), src, dst); +} + +static void +checked_rm(const char *f) +{ + if (!unlink(f)) + return; + + if (errno != ENOENT) + syserr(_("unable to remove '%s'"), f); +} + +static void DPKG_ATTR_PRINTF(1) +checked_rm_args(const char *fmt, ...) +{ + va_list args; + char *path; + + va_start(args, fmt); + path = xvasprintf(fmt, args); + va_end(args); + + checked_rm(path); + free(path); +} + +/* + * OBJECTS + */ + +struct fileset { + struct fileset *next; + + char *master_file; + int priority; + + struct slave_file { + struct slave_file *next; + char *name; + char *file; + } *slaves; +}; + +static struct fileset * +fileset_new(const char *master_file, int prio) +{ + struct fileset *fs; + + fs = xmalloc(sizeof(*fs)); + fs->next = NULL; + fs->master_file = xstrdup(master_file); + fs->priority = prio; + fs->slaves = NULL; + + return fs; +} + +static void +fileset_free(struct fileset *fs) +{ + struct slave_file *slave, *next; + + free(fs->master_file); + for (slave = fs->slaves; slave; slave = next) { + next = slave->next; + free(slave->name); + free(slave->file); + free(slave); + } + free(fs); +} + +static void +fileset_add_slave(struct fileset *fs, const char *name, const char *file) +{ + struct slave_file *sl, *cur, *prev = NULL; + + /* Replace existing first */ + for (cur = fs->slaves; cur; cur = cur->next) { + if (strcmp(cur->name, name) == 0) { + free(cur->file); + cur->file = xstrdup(file); + return; + } + prev = cur; + } + + /* Otherwise add new at the end */ + sl = xmalloc(sizeof(*sl)); + sl->next = NULL; + sl->name = xstrdup(name); + sl->file = xstrdup(file); + if (prev) + prev->next = sl; + else + fs->slaves = sl; +} + +static const char * +fileset_get_slave(struct fileset *fs, const char *name) +{ + struct slave_file *slave; + + for (slave = fs->slaves; slave; slave = slave->next) { + if (strcmp(slave->name, name) == 0) + return slave->file; + } + + return NULL; +} + +static bool +fileset_has_slave(struct fileset *fs, const char *name) +{ + const char *file = fileset_get_slave(fs, name); + + if (file == NULL) + return false; + + return file[0] != '\0'; +} + +static bool +fileset_can_install_slave(struct fileset *fs, const char *slave_name) +{ + /* Decide whether the slave alternative must be setup */ + if (fileset_has_slave(fs, slave_name)) { + const char *slave = fileset_get_slave(fs, slave_name); + + if (!pathname_is_missing(slave)) + return true; + } + + return false; +} + +struct slave_link { + struct slave_link *next; + char *name; + char *link; + bool updated; +}; + +struct commit_operation { + struct commit_operation *next; + + enum opcode { + OPCODE_NOP, + OPCODE_RM, + OPCODE_MV, + } opcode; + + char *arg_a; + char *arg_b; +}; + +enum alternative_update_reason { + ALT_UPDATE_NO, + ALT_UPDATE_SLAVE_CHANGED, + ALT_UPDATE_LINK_BROKEN, +}; + +struct alternative { + char *master_name; + char *master_link; + char *current; + + enum alternative_status { + ALT_ST_UNKNOWN, + ALT_ST_AUTO, + ALT_ST_MANUAL, + } status; + + struct slave_link *slaves; + struct fileset *choices; + + struct commit_operation *commit_ops; + + int ref_count; + bool modified; + bool known_current; +}; + +static void +slave_link_free(struct slave_link *slave) +{ + free(slave->name); + free(slave->link); + free(slave); +} + +static void +commit_operation_free(struct commit_operation *commit_op) +{ + free(commit_op->arg_a); + free(commit_op->arg_b); + free(commit_op); +} + +static struct alternative * +alternative_new(const char *name) +{ + struct alternative *alt; + + alt = xmalloc(sizeof(*alt)); + alt->master_name = xstrdup(name); + alt->master_link = NULL; + alt->current = NULL; + alt->status = ALT_ST_UNKNOWN; + alt->slaves = NULL; + alt->choices = NULL; + alt->commit_ops = NULL; + alt->modified = false; + alt->known_current = false; + alt->ref_count = 1; + + return alt; +} + +static inline void +alternative_ref(struct alternative *a) +{ + a->ref_count++; +} + +static inline bool +alternative_unref(struct alternative *a) +{ + return --a->ref_count == 0; +} + +static void +alternative_choices_free(struct alternative *a) +{ + struct fileset *fs; + + if (a->choices) + a->modified = true; + + while (a->choices) { + fs = a->choices; + a->choices = fs->next; + fileset_free(fs); + } +} + +static void +alternative_commit_operations_free(struct alternative *a) +{ + struct commit_operation *op; + + while (a->commit_ops) { + op = a->commit_ops; + a->commit_ops = op->next; + commit_operation_free(op); + } +} + +static void +alternative_reset(struct alternative *alt) +{ + struct slave_link *slave; + + free(alt->current); + alt->current = NULL; + free(alt->master_link); + alt->master_link = NULL; + while (alt->slaves) { + slave = alt->slaves; + alt->slaves = slave->next; + slave_link_free(slave); + } + alternative_choices_free(alt); + alternative_commit_operations_free(alt); + alt->modified = false; + alt->known_current = false; +} + +static void +alternative_free(struct alternative *alt) +{ + if (!alternative_unref(alt)) + return; + + alternative_reset(alt); + free(alt->master_name); + free(alt); +} + +static int +alternative_choices_count(struct alternative *alt) +{ + struct fileset *fs; + int count = 0; + + for (fs = alt->choices; fs; fs = fs->next) + count++; + + return count; +} + +static int +alternative_slaves_count(struct alternative *alt) +{ + struct slave_link *sl; + int count = 0; + + for (sl = alt->slaves; sl; sl = sl->next) + count++; + + return count; +} + +static int +compare_fileset(const void *va, const void *vb) +{ + const struct fileset *a = *(const struct fileset **)va; + const struct fileset *b = *(const struct fileset **)vb; + + assert(a && a->master_file); + assert(b && b->master_file); + + return strcmp(a->master_file, b->master_file); +} + +static int +compare_slave_link(const void *va, const void *vb) +{ + const struct slave_link *a = *(const struct slave_link **)va; + const struct slave_link *b = *(const struct slave_link **)vb; + + assert(a && a->name); + assert(b && b->name); + + return strcmp(a->name, b->name); +} + +static void +alternative_sort_choices(struct alternative *a) +{ + int count, i; + struct fileset **table, *fs; + + count = alternative_choices_count(a); + if (count < 2) /* Nothing to sort */ + return; + + /* Store objects in a table instead of a linked list */ + table = xmalloc(sizeof(fs) * count); + for (fs = a->choices, i = 0; fs; fs = fs->next) { + assert(fs->master_file); + table[i++] = fs; + } + + qsort(table, count, sizeof(fs), compare_fileset); + + /* Rewrite the linked list from the sorted table */ + a->choices = fs = table[0]; + table[count - 1]->next = NULL; + for (i = 1; i < count; fs = fs->next, i++) + fs->next = table[i]; + free(table); +} + +static void +alternative_sort_slaves(struct alternative *a) +{ + int count, i; + struct slave_link **table, *sl; + + count = alternative_slaves_count(a); + if (count < 2) /* Nothing to sort */ + return; + + /* Store objects in a table instead of a linked list */ + table = xmalloc(sizeof(sl) * count); + for (sl = a->slaves, i = 0; sl; sl = sl->next, i++) { + table[i] = sl; + } + + qsort(table, count, sizeof(sl), compare_slave_link); + + /* Rewrite the linked list from the sorted table */ + a->slaves = sl = table[0]; + table[count - 1]->next = NULL; + for (i = 1; i < count; sl = sl->next, i++) + sl->next = table[i]; + free(table); +} + +static struct fileset * +alternative_get_fileset(struct alternative *a, const char *file) +{ + struct fileset *fs; + + for (fs = a->choices; fs; fs = fs->next) + if (strcmp(fs->master_file, file) == 0) + return fs; + + return NULL; +} + +static struct slave_link * +alternative_get_slave(struct alternative *a, const char *name) +{ + struct slave_link *sl; + + for (sl = a->slaves; sl; sl = sl->next) + if (strcmp(sl->name, name) == 0) + return sl; + + return NULL; +} + +static bool +alternative_has_slave(struct alternative *a, const char *name) +{ + return alternative_get_slave(a, name) != NULL; +} + +static bool +alternative_has_choice(struct alternative *a, const char *file) +{ + return alternative_get_fileset(a, file) != NULL; +} + +static void +alternative_add_choice(struct alternative *a, struct fileset *fs) +{ + struct fileset *cur, *prev = NULL; + + /* Replace if already existing */ + for (cur = a->choices; cur; cur = cur->next) { + if (strcmp(cur->master_file, fs->master_file) == 0) { + fs->next = cur->next; + fileset_free(cur); + if (prev) + prev->next = fs; + else + a->choices = fs; + + /* XXX: Be smarter in detecting change? */ + a->modified = true; + return; + } + prev = cur; + } + + /* Otherwise add at the end */ + if (prev == NULL) + a->choices = fs; + else + prev->next = fs; + fs->next = NULL; + a->modified = true; +} + +static struct slave_link * +alternative_add_slave(struct alternative *a, + const char *slave_name, const char *slave_link) +{ + struct slave_link *sl, *new; + + /* Replace if already existing */ + for (sl = a->slaves; sl; sl = sl->next) { + if (strcmp(sl->name, slave_name) == 0) { + free(sl->link); + sl->link = xstrdup(slave_link); + return sl; + } + if (sl->next == NULL) + break; + } + + /* Otherwise create new and add at the end */ + new = xmalloc(sizeof(*new)); + new->name = xstrdup(slave_name); + new->link = xstrdup(slave_link); + new->updated = false; + new->next = NULL; + if (sl) + sl->next = new; + else + a->slaves = new; + + return new; +} + +static void +alternative_copy_slave(struct alternative *a, struct slave_link *sl) +{ + struct slave_link *sl_new; + + sl_new = alternative_add_slave(a, sl->name, sl->link); + sl_new->updated = sl->updated; +} + +static const char * +alternative_status_string(enum alternative_status status) +{ + return (status == ALT_ST_AUTO) ? "auto" : "manual"; +} + +static const char * +alternative_status_describe(enum alternative_status status) +{ + return (status == ALT_ST_AUTO) ? _("auto mode") : _("manual mode"); +} + +static void +alternative_set_status(struct alternative *a, enum alternative_status status) +{ + if (a->status == ALT_ST_UNKNOWN || status != a->status) + a->modified = true; + + if (a->status != ALT_ST_UNKNOWN && status != a->status) + log_msg("status of link group %s set to %s", a->master_link, + alternative_status_string(status)); + + a->status = status; +} + +static void +alternative_set_link(struct alternative *a, const char *linkname) +{ + if (a->master_link == NULL || strcmp(linkname, a->master_link) != 0) + a->modified = true; + + free(a->master_link); + a->master_link = xstrdup(linkname); +} + +static bool +alternative_remove_choice(struct alternative *a, const char *file) +{ + struct fileset *fs, *fs_prev; + + fs_prev = NULL; + for (fs = a->choices; fs; fs = fs->next) { + if (strcmp(fs->master_file, file) != 0) { + fs_prev = fs; + continue; + } + if (fs_prev) + fs_prev->next = fs->next; + else + a->choices = fs->next; + fileset_free(fs); + a->modified = true; + return true; + } + + return false; +} + +/* + * Alternatives Database Load/Store functions. + */ + +enum altdb_flags { + ALTDB_LAX_PARSER = 1 << 0, + ALTDB_WARN_PARSER = 1 << 1, +}; + +struct altdb_context { + FILE *fh; + char *filename; + enum altdb_flags flags; + bool modified; + void DPKG_ATTR_NORET DPKG_ATTR_PRINTF(2) + (*bad_format)(struct altdb_context *, const char *format, ...); + jmp_buf on_error; +}; + +static int +altdb_filter_namelist(const struct dirent *entry) +{ + if (strcmp(entry->d_name, ".") == 0 || + strcmp(entry->d_name, "..") == 0 || + (strlen(entry->d_name) > strlen(ALT_TMP_EXT) && + strcmp(entry->d_name + strlen(entry->d_name) - + strlen(ALT_TMP_EXT), ALT_TMP_EXT) == 0)) + return 0; + return 1; +} + +static int +altdb_get_namelist(struct dirent ***table) +{ + int count; + + count = scandir(admdir, table, altdb_filter_namelist, alphasort); + if (count < 0) + syserr(_("cannot scan directory '%.255s'"), admdir); + + return count; +} + +static void +altdb_free_namelist(struct dirent **table, int n) +{ + while (n--) + free(table[n]); + free(table); +} + +static char * +altdb_get_line(struct altdb_context *ctx, const char *name) +{ + char *buf, *line; + size_t len, bufsz, i; + + bufsz = 1024; + buf = xmalloc(bufsz); + + for (i = 0; true; i += strlen(line)) { + errno = 0; + line = fgets(buf + i, bufsz - i, ctx->fh); + if (line) { + if (strlen(buf) < bufsz - 1 || buf[bufsz - 2] == '\n') + break; + /* Need more space */ + bufsz *= 2; + buf = realloc(buf, bufsz); + if (!buf) + error(_("failed to allocate memory")); + continue; + } + if (feof(ctx->fh)) + ctx->bad_format(ctx, _("unexpected end of file while trying " + "to read %s"), name); + ctx->bad_format(ctx, _("while reading %s: %s"), + name, strerror(errno)); + } + + len = strlen(buf); + if (len == 0 || buf[len - 1] != '\n') { + ctx->bad_format(ctx, _("line not terminated while trying " + "to read %s"), name); + } + line[len - 1] = '\0'; + + return buf; +} + +static void DPKG_ATTR_NORET DPKG_ATTR_PRINTF(2) +altdb_parse_error(struct altdb_context *ctx, const char *format, ...) +{ + char *msg; + va_list args; + + va_start(args, format); + msg = xvasprintf(format, args); + va_end(args); + + error(_("%s corrupt: %s"), ctx->filename, msg); +} + +static void DPKG_ATTR_NORET DPKG_ATTR_PRINTF(2) +altdb_parse_stop(struct altdb_context *ctx, const char *format, ...) +{ + longjmp(ctx->on_error, 1); +} + +static void +altdb_print_line(struct altdb_context *ctx, const char *line) +{ + if (strchr(line, '\n') != NULL) + error(_("newlines prohibited in update-alternatives files (%s)"), + line); + + if (fprintf(ctx->fh, "%s\n", line) < (int) strlen(line) + 1) + syserr(_("unable to write file '%s'"), ctx->filename); +} + +static bool +alternative_parse_slave(struct alternative *a, struct altdb_context *ctx) +{ + char *name, *linkname; + struct slave_link *sl; + + name = altdb_get_line(ctx, _("slave name")); + if (!strlen(name)) { /* End of list */ + free(name); + return false; + } + sl = alternative_get_slave(a, name); + if (sl) { + free(name); + ctx->bad_format(ctx, _("duplicate slave name %s"), sl->name); + } + + linkname = altdb_get_line(ctx, _("slave link")); + if (strcmp(linkname, a->master_link) == 0) { + free(linkname); + free(name); + ctx->bad_format(ctx, _("slave link same as main link %s"), + a->master_link); + } + for (sl = a->slaves; sl; sl = sl->next) { + if (strcmp(linkname, sl->link) == 0) { + free(linkname); + free(name); + ctx->bad_format(ctx, _("duplicate slave link %s"), + sl->link); + } + } + + alternative_add_slave(a, name, linkname); + free(linkname); + free(name); + + return true; +} + +static bool +alternative_parse_fileset(struct alternative *a, struct altdb_context *ctx) +{ + struct fileset *fs; + struct slave_link *sl; + char *master_file; + + master_file = altdb_get_line(ctx, _("master file")); + if (!strlen(master_file)) { /* End of list */ + free(master_file); + return false; + } + + fs = alternative_get_fileset(a, master_file); + if (fs) + ctx->bad_format(ctx, _("duplicate path %s"), master_file); + + if (pathname_is_missing(master_file)) { + char *junk; + + /* File not found - remove. */ + if (ctx->flags & ALTDB_WARN_PARSER) + warning(_("alternative %s (part of link group %s) " + "doesn't exist; removing from list of " + "alternatives"), master_file, a->master_name); + junk = altdb_get_line(ctx, _("priority")); + free(junk); + for (sl = a->slaves; sl; sl = sl->next) { + junk = altdb_get_line(ctx, _("slave file")); + free(junk); + } + ctx->modified = true; + } else { + char *prio_str, *prio_end; + long prio; + + prio_str = altdb_get_line(ctx, _("priority")); + errno = 0; + prio = strtol(prio_str, &prio_end, 10); + /* XXX: Leak master_file/prio_str on non-fatal error */ + if (prio_str == prio_end || *prio_end != '\0') + ctx->bad_format(ctx, _("priority of %s: %s"), + master_file, prio_str); + if (prio < INT_MIN || prio > INT_MAX || errno == ERANGE) + ctx->bad_format(ctx, + _("priority of %s is out of range: %s"), + master_file, prio_str); + free(prio_str); + + fs = fileset_new(master_file, prio); + for (sl = a->slaves; sl; sl = sl->next) { + char *slave_file = altdb_get_line(ctx, _("slave file")); + fileset_add_slave(fs, sl->name, slave_file); + free(slave_file); + } + alternative_add_choice(a, fs); + } + free(master_file); + + return true; +} + +static bool +alternative_load(struct alternative *a, enum altdb_flags flags) +{ + struct altdb_context ctx; + struct stat st; + char *status; + char *master_link; + + /* Initialize parse context */ + if (setjmp(ctx.on_error)) { + if (ctx.fh) + fclose(ctx.fh); + free(ctx.filename); + alternative_reset(a); + return false; + } + ctx.modified = false; + ctx.flags = flags; + if (flags & ALTDB_LAX_PARSER) + ctx.bad_format = altdb_parse_stop; + else + ctx.bad_format = altdb_parse_error; + ctx.filename = xasprintf("%s/%s", admdir, a->master_name); + + /* Open the alternative file. */ + ctx.fh = fopen(ctx.filename, "r"); + if (ctx.fh == NULL) { + if (errno == ENOENT) + return false; + + syserr(_("unable to open file '%s'"), ctx.filename); + } + + /* Verify the alternative is not empty. */ + if (fstat(fileno(ctx.fh), &st) == -1) + syserr(_("cannot stat file '%s'"), ctx.filename); + if (st.st_size == 0) + return false; + + /* Start parsing mandatory attributes (link+status) of the alternative */ + alternative_reset(a); + status = altdb_get_line(&ctx, _("status")); + if (strcmp(status, "auto") != 0 && strcmp(status, "manual") != 0) + ctx.bad_format(&ctx, _("invalid status")); + alternative_set_status(a, (strcmp(status, "auto") == 0) ? + ALT_ST_AUTO : ALT_ST_MANUAL); + free(status); + + master_link = altdb_get_line(&ctx, _("master link")); + alternative_set_link(a, master_link); + free(master_link); + + /* Parse the description of the slaves links of the alternative */ + while (alternative_parse_slave(a, &ctx)); + + /* Parse the available choices in the alternative */ + while (alternative_parse_fileset(a, &ctx)) ; + + /* Close database file */ + if (fclose(ctx.fh)) + syserr(_("unable to close file '%s'"), ctx.filename); + free(ctx.filename); + + /* Initialize the modified field which has been erroneously changed + * by the various alternative_(add|set)_* calls: + * false unless a choice has been auto-cleaned */ + a->modified = ctx.modified; + + return true; +} + +static void +alternative_save(struct alternative *a) +{ + struct altdb_context ctx; + struct slave_link *sl, *sl_prev; + struct fileset *fs; + char *filenew, *file; + + /* Cleanup unused slaves before writing admin file. */ + sl_prev = NULL; + sl = a->slaves; + while (sl) { + bool has_slave = false; + + for (fs = a->choices; fs; fs = fs->next) { + if (fileset_has_slave(fs, sl->name)) { + has_slave = true; + break; + } + } + + if (!has_slave) { + struct slave_link *sl_rm; + + verbose(_("discarding obsolete slave link %s (%s)"), + sl->name, sl->link); + if (sl_prev) + sl_prev->next = sl->next; + else + a->slaves = sl->next; + sl_rm = sl; + sl = sl->next; + slave_link_free(sl_rm); + } else { + sl_prev = sl; + sl = sl->next; + } + } + + /* Sort entries */ + alternative_sort_slaves(a); + alternative_sort_choices(a); + + /* Write admin file. */ + file = xasprintf("%s/%s", admdir, a->master_name); + filenew = xasprintf("%s" ALT_TMP_EXT, file); + + ctx.filename = filenew; + ctx.fh = fopen(ctx.filename, "w"); + if (ctx.fh == NULL) + syserr(_("unable to create file '%s'"), ctx.filename); + + altdb_print_line(&ctx, alternative_status_string(a->status)); + altdb_print_line(&ctx, a->master_link); + for (sl = a->slaves; sl; sl = sl->next) { + altdb_print_line(&ctx, sl->name); + altdb_print_line(&ctx, sl->link); + } + altdb_print_line(&ctx, ""); + + for (fs = a->choices; fs; fs = fs->next) { + char *prio; + + altdb_print_line(&ctx, fs->master_file); + + prio = xasprintf("%d", fs->priority); + altdb_print_line(&ctx, prio); + free(prio); + + for (sl = a->slaves; sl; sl = sl->next) { + if (fileset_has_slave(fs, sl->name)) + altdb_print_line(&ctx, + fileset_get_slave(fs, sl->name)); + else + altdb_print_line(&ctx, ""); + } + } + altdb_print_line(&ctx, ""); + + /* Close database file */ + if (fflush(ctx.fh)) + syserr(_("unable to flush file '%s'"), ctx.filename); + if (fsync(fileno(ctx.fh))) + syserr(_("unable to sync file '%s'"), ctx.filename); + if (fclose(ctx.fh)) + syserr(_("unable to close file '%s'"), ctx.filename); + + /* Put in place atomically. */ + checked_mv(filenew, file); + + free(filenew); + free(file); +} + +static const char * +alternative_set_current(struct alternative *a, char *new_choice) +{ + a->known_current = true; + a->current = new_choice; + + return new_choice; +} + +static const char * +alternative_get_current(struct alternative *a) +{ + char *curlink; + char *file; + + if (a->known_current) + return a->current; + + curlink = xasprintf("%s/%s", altdir, a->master_name); + file = areadlink(curlink); + if (file == NULL && errno != ENOENT) + syserr(_("cannot stat file '%s'"), curlink); + free(curlink); + + return alternative_set_current(a, file); +} + +static struct fileset * +alternative_get_best(struct alternative *a) +{ + struct fileset *fs, *best; + const char *current; + + current = alternative_get_current(a); + if (current) + best = alternative_get_fileset(a, current); + else + best = NULL; + + if (best == NULL) + best = a->choices; + + for (fs = a->choices; fs; fs = fs->next) + if (fs->priority > best->priority) + best = fs; + + return best; +} + +static void +alternative_display_query(struct alternative *a) +{ + struct fileset *best, *fs; + struct slave_link *sl; + const char *current; + + pr("Name: %s", a->master_name); + pr("Link: %s", a->master_link); + if (alternative_slaves_count(a) > 0) { + pr("Slaves:"); + for (sl = a->slaves; sl; sl = sl->next) + pr(" %s %s", sl->name, sl->link); + } + pr("Status: %s", alternative_status_string(a->status)); + best = alternative_get_best(a); + if (best) + pr("Best: %s", best->master_file); + current = alternative_get_current(a); + pr("Value: %s", current ? current : "none"); + + for (fs = a->choices; fs; fs = fs->next) { + printf("\n"); + pr("Alternative: %s", fs->master_file); + pr("Priority: %d", fs->priority); + if (alternative_slaves_count(a) == 0) + continue; + pr("Slaves:"); + for (sl = a->slaves; sl; sl = sl->next) { + if (fileset_has_slave(fs, sl->name)) + pr(" %s %s", sl->name, + fileset_get_slave(fs, sl->name)); + } + } +} + +static void +alternative_display_user(struct alternative *a) +{ + const char *current; + struct fileset *fs; + struct slave_link *sl; + + pr("%s - %s", a->master_name, alternative_status_describe(a->status)); + fs = alternative_get_best(a); + if (fs) + pr(_(" link best version is %s"), fs->master_file); + else + pr(_(" link best version not available")); + current = alternative_get_current(a); + if (current) { + pr(_(" link currently points to %s"), current); + } else { + pr(_(" link currently absent")); + } + pr(_(" link %s is %s"), a->master_name, a->master_link); + for (sl = a->slaves; sl; sl = sl->next) + pr(_(" slave %s is %s"), sl->name, sl->link); + + for (fs = a->choices; fs; fs = fs->next) { + pr(_("%s - priority %d"), fs->master_file, fs->priority); + for (sl = a->slaves; sl; sl = sl->next) { + if (fileset_has_slave(fs, sl->name)) + pr(_(" slave %s: %s"), sl->name, + fileset_get_slave(fs, sl->name)); + } + } +} + +static void +alternative_display_list(struct alternative *a) +{ + struct fileset *fs; + + for (fs = a->choices; fs; fs = fs->next) + pr("%s", fs->master_file); +} + +static void +alternative_print_choice(struct alternative *a, enum alternative_status status, + struct fileset *fs, int idx, int len) +{ + const char *current = alternative_get_current(a); + int mark; + + if (a->status == status && + current && strcmp(current, fs->master_file) == 0) + mark = '*'; + else + mark = ' '; + + pr("%c %-12d %-*s % -10d %s", mark, idx, len, + fs->master_file, fs->priority, alternative_status_describe(status)); +} + +static char * +alternative_select_choice(struct alternative *a) +{ + const char *current; + char *ret, selection[_POSIX_PATH_MAX]; + struct fileset *best, *fs; + int n_choices; + int len, idx; + + n_choices = alternative_choices_count(a); + current = alternative_get_current(a); + best = alternative_get_best(a); + assert(best); + + len = 15; + for (fs = a->choices; fs; fs = fs->next) + len = max(len, (int)strlen(fs->master_file) + 1); + + for (;;) { + pr(P_("There is %d choice for the alternative %s (providing %s).", + "There are %d choices for the alternative %s (providing %s).", + n_choices), n_choices, a->master_name, a->master_link); + printf("\n"); + + pr(" %-12.12s %-*.*s %-10.10s %s", _("Selection"), len, len, + _("Path"), _("Priority"), _("Status")); + pr("------------------------------------------------------------"); + idx = 0; + alternative_print_choice(a, ALT_ST_AUTO, best, idx++, len); + for (fs = a->choices; fs; fs = fs->next, idx++) + alternative_print_choice(a, ALT_ST_MANUAL, fs, idx, len); + printf("\n"); + printf(_("Press <enter> to keep the current choice[*], " + "or type selection number: ")); + ret = fgets(selection, sizeof(selection), stdin); + if (ret == NULL || strlen(selection) == 0) { + return NULL; + } + selection[strlen(selection) - 1] = '\0'; + if (strlen(selection) == 0) + return xstrdup(current); + errno = 0; + idx = strtol(selection, &ret, 10); + if (idx >= 0 && errno == 0 && *ret == '\0') { + /* Look up by index */ + if (idx == 0) { + alternative_set_status(a, ALT_ST_AUTO); + return xstrdup(best->master_file); + } + idx--; + for (fs = a->choices; idx && fs; idx--) + fs = fs->next; + if (fs) { + alternative_set_status(a, ALT_ST_MANUAL); + return xstrdup(fs->master_file); + } + } else { + /* Look up by name */ + fs = alternative_get_fileset(a, selection); + if (fs) { + alternative_set_status(a, ALT_ST_MANUAL); + return xstrdup(selection); + } + } + } +} + +static char * +alternative_config(struct alternative *a, const char *current_choice) +{ + char *new_choice = NULL; + + if (alternative_choices_count(a) == 0) { + pr(_("There is no program which provides %s."), + a->master_name); + pr(_("Nothing to configure.")); + } else if (opt_skip_auto && a->status == ALT_ST_AUTO) { + alternative_display_user(a); + } else if (alternative_choices_count(a) == 1 && + a->status == ALT_ST_AUTO && + current_choice != NULL) { + pr(_("There is only one alternative in link group %s (providing %s): %s"), + a->master_name, a->master_link, current_choice); + pr(_("Nothing to configure.")); + } else { + new_choice = alternative_select_choice(a); + } + + return new_choice; +} + +static void +alternative_add_commit_op(struct alternative *a, enum opcode opcode, + const char *arg_a, const char *arg_b) +{ + struct commit_operation *op, *cur; + + op = xmalloc(sizeof(*op)); + op->opcode = opcode; + op->arg_a = xstrdup(arg_a); + op->arg_b = xstrdup(arg_b); + op->next = NULL; + + /* Add at the end */ + cur = a->commit_ops; + while (cur && cur->next) + cur = cur->next; + if (cur) + cur->next = op; + else + a->commit_ops = op; +} + +static void +alternative_commit(struct alternative *a) +{ + struct commit_operation *op; + + for (op = a->commit_ops; op; op = op->next) { + switch (op->opcode) { + case OPCODE_NOP: + break; + case OPCODE_RM: + checked_rm(op->arg_a); + break; + case OPCODE_MV: + checked_mv(op->arg_a, op->arg_b); + break; + } + } + + alternative_commit_operations_free(a); +} + +enum alternative_path_status { + ALT_PATH_SYMLINK, + ALT_PATH_MISSING, + ALT_PATH_OTHER, +}; + +static enum alternative_path_status +alternative_path_classify(const char *linkname) +{ + struct stat st; + + errno = 0; + if (lstat(linkname, &st) == -1) { + if (errno != ENOENT) + syserr(_("cannot stat file '%s'"), linkname); + return ALT_PATH_MISSING; + } else if (S_ISLNK(st.st_mode)) { + return ALT_PATH_SYMLINK; + } else { + return ALT_PATH_OTHER; + } +} + +static bool +alternative_path_can_remove(const char *linkname) +{ + if (opt_force) + return true; + + if (alternative_path_classify(linkname) == ALT_PATH_OTHER) + return false; + else + return true; +} + +static bool +alternative_path_needs_update(const char *linkname, const char *filename) +{ + char *linktarget; + bool update; + + if (opt_force) + return true; + + switch (alternative_path_classify(linkname)) { + case ALT_PATH_SYMLINK: + linktarget = xreadlink(linkname); + if (strcmp(linktarget, filename) == 0) + update = false; + else + update = true; + free(linktarget); + + return update; + case ALT_PATH_OTHER: + warning(_("not replacing %s with a link"), linkname); + return false; + case ALT_PATH_MISSING: + default: + return true; + } +} + +static void +alternative_prepare_install_single(struct alternative *a, const char *name, + const char *linkname, const char *file) +{ + char *fntmp, *fn; + + /* Create link in /etc/alternatives. */ + fntmp = xasprintf("%s/%s" ALT_TMP_EXT, altdir, name); + fn = xasprintf("%s/%s", altdir, name); + checked_rm(fntmp); + checked_symlink(file, fntmp); + alternative_add_commit_op(a, OPCODE_MV, fntmp, fn); + free(fntmp); + + if (alternative_path_needs_update(linkname, fn)) { + /* Create alternative link. */ + fntmp = xasprintf("%s" ALT_TMP_EXT, linkname); + checked_rm(fntmp); + checked_symlink(fn, fntmp); + alternative_add_commit_op(a, OPCODE_MV, fntmp, linkname); + free(fntmp); + } + free(fn); +} + +static void +alternative_prepare_install(struct alternative *a, const char *choice) +{ + struct slave_link *sl; + struct fileset *fs; + + fs = alternative_get_fileset(a, choice); + if (fs == NULL) + error(_("can't install unknown choice %s"), choice); + + /* Take care of master alternative */ + alternative_prepare_install_single(a, a->master_name, a->master_link, + choice); + + /* Take care of slaves alternatives */ + for (sl = a->slaves; sl; sl = sl->next) { + char *fn; + + if (fileset_can_install_slave(fs, sl->name)) { + alternative_prepare_install_single(a, sl->name, + sl->link, fileset_get_slave(fs, sl->name)); + continue; + } + + /* Slave can't be installed */ + if (fileset_has_slave(fs, sl->name)) + warning(_("skip creation of %s because associated " + "file %s (of link group %s) doesn't exist"), + sl->link, fileset_get_slave(fs, sl->name), + a->master_name); + + /* Drop unused slave. */ + fn = xasprintf("%s/%s", altdir, sl->name); + if (alternative_path_can_remove(sl->link)) + alternative_add_commit_op(a, OPCODE_RM, sl->link, NULL); + else + warning(_("not removing %s since it's not a symlink"), + sl->link); + alternative_add_commit_op(a, OPCODE_RM, fn, NULL); + free(fn); + } +} + +static void +alternative_remove_files(struct alternative *a) +{ + struct slave_link *sl; + + checked_rm_args("%s" ALT_TMP_EXT, a->master_link); + if (alternative_path_can_remove(a->master_link)) + checked_rm(a->master_link); + + checked_rm_args("%s/%s" ALT_TMP_EXT, altdir, a->master_name); + checked_rm_args("%s/%s", altdir, a->master_name); + + for (sl = a->slaves; sl; sl = sl->next) { + checked_rm_args("%s" ALT_TMP_EXT, sl->link); + if (alternative_path_can_remove(sl->link)) + checked_rm(sl->link); + + checked_rm_args("%s/%s" ALT_TMP_EXT, altdir, sl->name); + checked_rm_args("%s/%s", altdir, sl->name); + } + /* Drop admin file */ + checked_rm_args("%s/%s", admdir, a->master_name); +} + +static const char * +alternative_remove(struct alternative *a, const char *current_choice, + const char *path) +{ + const char *new_choice = NULL; + + if (alternative_has_choice(a, path)) + alternative_remove_choice(a, path); + else + verbose(_("alternative %s for %s not registered; not removing"), + path, a->master_name); + + if (current_choice && strcmp(current_choice, path) == 0) { + struct fileset *best; + + /* Current choice is removed. */ + if (a->status == ALT_ST_MANUAL) { + /* And it was manual, switch to auto. */ + info(_("removing manually selected alternative " + "- switching %s to auto mode"), + a->master_name); + alternative_set_status(a, ALT_ST_AUTO); + } + best = alternative_get_best(a); + if (best) + new_choice = best->master_file; + } + + return new_choice; +} + +static bool +alternative_has_broken_slave(struct slave_link *sl, struct fileset *fs) +{ + if (fileset_can_install_slave(fs, sl->name)) { + char *wanted; + char *sl_altlnk, *sl_current; + + /* Verify link -> /etc/alternatives/foo */ + sl_altlnk = areadlink(sl->link); + if (!sl_altlnk) + return true; + wanted = xasprintf("%s/%s", altdir, sl->name); + if (strcmp(sl_altlnk, wanted) != 0) { + free(wanted); + free(sl_altlnk); + return true; + } + free(sl_altlnk); + /* Verify /etc/alternatives/foo -> file */ + sl_current = areadlink(wanted); + free(wanted); + if (!sl_current) + return true; + if (strcmp(sl_current, fileset_get_slave(fs, sl->name)) != 0) { + free(sl_current); + return true; + } + free(sl_current); + } else { + char *sl_altlnk; + + /* Slave link must not exist. */ + if (alternative_path_classify(sl->link) != ALT_PATH_MISSING) + return true; + sl_altlnk = xasprintf("%s/%s", altdir, sl->name); + if (alternative_path_classify(sl_altlnk) != ALT_PATH_MISSING) { + free(sl_altlnk); + return true; + } + free(sl_altlnk); + } + + return false; +} + +static enum alternative_update_reason +alternative_needs_update(struct alternative *a) +{ + enum alternative_update_reason reason = ALT_UPDATE_NO; + const char *current; + char *altlnk, *wanted; + struct fileset *fs; + struct slave_link *sl; + + /* Check master link */ + altlnk = areadlink(a->master_link); + if (!altlnk) + return ALT_UPDATE_LINK_BROKEN; + wanted = xasprintf("%s/%s", altdir, a->master_name); + if (strcmp(altlnk, wanted) != 0) { + free(wanted); + free(altlnk); + return ALT_UPDATE_LINK_BROKEN; + } + free(wanted); + free(altlnk); + + /* Stop if we have an unmanaged alternative */ + current = alternative_get_current(a); + if (current == NULL) + return ALT_UPDATE_LINK_BROKEN; + + fs = alternative_get_fileset(a, current); + + /* Stop if we do not have the choice. */ + if (fs == NULL) + return ALT_UPDATE_NO; + + /* Check slaves */ + for (sl = a->slaves; sl; sl = sl->next) { + if (alternative_has_broken_slave(sl, fs)) { + if (sl->updated) + reason = ALT_UPDATE_SLAVE_CHANGED; + else + return ALT_UPDATE_LINK_BROKEN; + } + } + + return reason; +} + +struct alternative_map { + struct alternative_map *next; + + const char *key; + struct alternative *item; +}; + +static struct alternative_map * +alternative_map_new(const char *key, struct alternative *a) +{ + struct alternative_map *am; + + am = xmalloc(sizeof(*am)); + am->next = NULL; + am->key = key; + am->item = a; + + return am; +} + +static struct alternative * +alternative_map_find(struct alternative_map *am, const char *key) +{ + for (; am; am = am->next) + if (am->key && strcmp(am->key, key) == 0) + return am->item; + + return NULL; +} + +static void +alternative_map_add(struct alternative_map *am, const char *key, + struct alternative *a) +{ + if (am->key == NULL) { + am->key = key; + am->item = a; + } else { + struct alternative_map *new = alternative_map_new(key, a); + + while (am->next) + am = am->next; + am->next = new; + } +} + +static void +alternative_map_load_names(struct alternative_map *alt_map_obj) +{ + struct dirent **table; + int i, count; + + count = altdb_get_namelist(&table); + for (i = 0; i < count; i++) { + struct alternative *a_new = alternative_new(table[i]->d_name); + + if (!alternative_load(a_new, ALTDB_LAX_PARSER)) { + alternative_free(a_new); + continue; + } + alternative_map_add(alt_map_obj, a_new->master_name, a_new); + } + altdb_free_namelist(table, count); +} + +static void +alternative_map_load_tree(struct alternative_map *alt_map_links, + struct alternative_map *alt_map_parent) +{ + struct dirent **table; + int i, count; + + count = altdb_get_namelist(&table); + for (i = 0; i < count; i++) { + struct slave_link *sl; + struct alternative *a_new = alternative_new(table[i]->d_name); + + if (!alternative_load(a_new, ALTDB_LAX_PARSER)) { + alternative_free(a_new); + continue; + } + alternative_map_add(alt_map_links, a_new->master_link, a_new); + alternative_ref(a_new); + alternative_map_add(alt_map_parent, a_new->master_name, a_new); + for (sl = a_new->slaves; sl; sl = sl->next) { + alternative_ref(a_new); + alternative_map_add(alt_map_links, sl->link, a_new); + alternative_ref(a_new); + alternative_map_add(alt_map_parent, sl->name, a_new); + } + } + altdb_free_namelist(table, count); +} + +static void +alternative_map_free(struct alternative_map *am) +{ + struct alternative_map *am_next; + + while (am) { + am_next = am->next; + if (am->item) + alternative_free(am->item); + free(am); + am = am_next; + } +} + +static const char * +alternative_set_manual(struct alternative *a, const char *path) +{ + const char *new_choice = NULL; + + if (alternative_has_choice(a, path)) + new_choice = path; + else + error(_("alternative %s for %s not registered; " + "not setting"), path, a->master_name); + alternative_set_status(a, ALT_ST_MANUAL); + + return new_choice; +} + +static const char * +alternative_set_auto(struct alternative *a) +{ + const char *new_choice = NULL; + + alternative_set_status(a, ALT_ST_AUTO); + if (alternative_choices_count(a) == 0) + pr(_("There is no program which provides %s."), + a->master_name); + else + new_choice = alternative_get_best(a)->master_file; + + return new_choice; +} + +static const char * +get_argv_string(int argc, char **argv) +{ + static char string[2048]; + size_t cur_len; + int i; + + string[0] = '\0'; + cur_len = 0; + for (i = 1; i < argc; i++) { + size_t arg_len = strlen(argv[i]); + + if (cur_len + arg_len + 2 > sizeof(string)) + break; + if (cur_len) { + strcpy(string + cur_len, " "); + cur_len++; + } + strcpy(string + cur_len, argv[i]); + cur_len += arg_len; + } + + return string; +} + +static void +alternative_select_mode(struct alternative *a, const char *current_choice) +{ + if (current_choice) { + /* Detect manually modified alternative, switch to manual. */ + if (!alternative_has_choice(a, current_choice)) { + if (pathname_is_missing(current_choice)) { + warning(_("%s/%s is dangling; it will be updated " + "with best choice"), altdir, a->master_name); + alternative_set_status(a, ALT_ST_AUTO); + } else if (a->status != ALT_ST_MANUAL) { + warning(_("%s/%s has been changed (manually or by " + "a script); switching to manual " + "updates only"), altdir, a->master_name); + alternative_set_status(a, ALT_ST_MANUAL); + } + } + } else { + /* Lack of alternative link => automatic mode. */ + verbose(_("setting up automatic selection of %s"), + a->master_name); + alternative_set_status(a, ALT_ST_AUTO); + } +} + +static void +alternative_evolve_slave(struct alternative *a, const char *cur_choice, + struct slave_link *sl, struct fileset *fs) +{ + struct slave_link *sl_old; + char *new_file = NULL; + const char *old, *new; + + sl_old = alternative_get_slave(a, sl->name); + if (sl_old == NULL) { + sl->updated = true; + return; + } + + old = sl_old->link; + new = sl->link; + + if (cur_choice && strcmp(cur_choice, fs->master_file) == 0) { + new_file = xstrdup(fileset_get_slave(fs, sl->name)); + } else { + char *lnk; + + lnk = xasprintf("%s/%s", altdir, sl->name); + new_file = areadlink(lnk); + free(lnk); + } + if (strcmp(old, new) != 0 && + alternative_path_classify(old) == ALT_PATH_SYMLINK) { + bool rename_link = false; + + if (new_file) + rename_link = !pathname_is_missing(new_file); + + if (rename_link) { + info(_("renaming %s slave link from %s to %s"), + sl->name, old, new); + checked_mv(old, new); + } else { + checked_rm(old); + } + + sl->updated = true; + } + free(new_file); +} + +static void +alternative_evolve(struct alternative *a, struct alternative *b, + const char *cur_choice, struct fileset *fs) +{ + struct slave_link *sl; + bool is_link; + + is_link = alternative_path_classify(a->master_link) == ALT_PATH_SYMLINK; + if (is_link && strcmp(a->master_link, b->master_link) != 0) { + info(_("renaming %s link from %s to %s"), b->master_name, + a->master_link, b->master_link); + checked_mv(a->master_link, b->master_link); + } + alternative_set_link(a, b->master_link); + + /* Check if new slaves have been added, or existing + * ones renamed. */ + for (sl = b->slaves; sl; sl = sl->next) { + alternative_evolve_slave(a, cur_choice, sl, fs); + alternative_copy_slave(a, sl); + } +} + +static void +alternative_update(struct alternative *a, + const char *current_choice, const char *new_choice) +{ + enum alternative_update_reason reason; + + /* No choice left, remove everything. */ + if (!alternative_choices_count(a)) { + log_msg("link group %s fully removed", a->master_name); + alternative_remove_files(a); + return; + } + + /* New choice wanted. */ + if (new_choice && + (!current_choice || strcmp(new_choice, current_choice) != 0)) { + log_msg("link group %s updated to point to %s", a->master_name, + new_choice); + if (a->status == ALT_ST_AUTO) + info(_("using %s to provide %s (%s) in auto mode"), + new_choice, a->master_link, a->master_name); + else + info(_("using %s to provide %s (%s) in manual mode"), + new_choice, a->master_link, a->master_name); + debug("prepare_install(%s)", new_choice); + alternative_prepare_install(a, new_choice); + } else if ((reason = alternative_needs_update(a))) { + if (reason == ALT_UPDATE_SLAVE_CHANGED) { + log_msg("link group %s updated with changed slaves", + a->master_name); + info(_("updating alternative %s " + "because link group %s has changed slave links"), + current_choice, a->master_name); + } else { + log_msg("auto-repair link group %s", a->master_name); + warning(_("forcing reinstallation of alternative %s " + "because link group %s is broken"), + current_choice, a->master_name); + } + + if (current_choice && !alternative_has_choice(a, current_choice)) { + struct fileset *best = alternative_get_best(a); + + warning(_("current alternative %s is unknown, " + "switching to %s for link group %s"), + current_choice, best->master_file, + a->master_name); + current_choice = best->master_file; + alternative_set_status(a, ALT_ST_AUTO); + } + + if (current_choice) + alternative_prepare_install(a, current_choice); + } + + /* Save administrative file if needed. */ + if (a->modified) { + debug("%s is modified and will be saved", a->master_name); + alternative_save(a); + } + + /* Replace all symlinks in one pass. */ + alternative_commit(a); +} + +static void +alternative_config_all(void) +{ + struct alternative_map *alt_map_obj; + struct alternative_map *am; + + alt_map_obj = alternative_map_new(NULL, NULL); + alternative_map_load_names(alt_map_obj); + + for (am = alt_map_obj; am && am->item; am = am->next) { + const char *current_choice; + char *new_choice; + + current_choice = alternative_get_current(am->item); + alternative_select_mode(am->item, current_choice); + + new_choice = alternative_config(am->item, current_choice); + + alternative_update(am->item, current_choice, new_choice); + + free(new_choice); + } + + alternative_map_free(alt_map_obj); +} + +static void +alternative_get_selections(void) +{ + struct alternative_map *alt_map_obj; + struct alternative_map *am; + + alt_map_obj = alternative_map_new(NULL, NULL); + alternative_map_load_names(alt_map_obj); + + for (am = alt_map_obj; am && am->item; am = am->next) { + const char *current; + + current = alternative_get_current(am->item); + printf("%-30s %-8s %s\n", am->key, + alternative_status_string(am->item->status), + current ? current : ""); + } + + alternative_map_free(alt_map_obj); +} + +static void +alternative_set_selection(struct alternative_map *all, const char *name, + const char *status, const char *choice) +{ + struct alternative *a; + + debug("set_selection(%s, %s, %s)", name, status, choice); + a = alternative_map_find(all, name); + if (a) { + const char *new_choice = NULL; + + if (strcmp(status, "auto") == 0) { + new_choice = alternative_set_auto(a); + } else if (alternative_has_choice(a, choice)) { + new_choice = alternative_set_manual(a, choice); + } else { + pr(_("Alternative %s unchanged because choice " + "%s is not available."), name, choice); + } + + if (new_choice) { + const char *current_choice; + + current_choice = alternative_get_current(a); + alternative_select_mode(a, current_choice); + + alternative_update(a, current_choice, new_choice); + } + } else { + pr(_("Skip unknown alternative %s."), name); + } +} + +static void +alternative_set_selections(FILE *input, const char *desc) +{ + struct alternative_map *alt_map_obj; + + alt_map_obj = alternative_map_new(NULL, NULL); + alternative_map_load_names(alt_map_obj); + + for (;;) { + char line[1024], *res, *name, *status, *choice; + size_t len, i; + + errno = 0; + /* Can't use scanf("%s %s %s") because choice can + * contain a space */ + res = fgets(line, sizeof(line), input); + if (res == NULL && errno) { + syserr(_("read error in %.250s"), desc); + } else if (res == NULL) { + break; + } + len = strlen(line); + if (len == 0 || line[len - 1] != '\n') { + error(_("line too long or not terminated while " + "trying to read %s"), desc); + } + line[len - 1] = '\0'; + len--; + + /* Delimit name string in line */ + i = 0; + name = line; + while (i < len && !isblank(line[i])) + i++; + if (i >= len) { + printf("[%s %s] ", PROGNAME, "--set-selections"); + pr(_("Skip invalid line: %s"), line); + continue; + } + line[i++] = '\0'; + while (i < len && isblank(line[i])) + i++; + + /* Delimit status string in line */ + status = line + i; + while (i < len && !isblank(line[i])) + i++; + if (i >= len) { + printf("[%s %s] ", PROGNAME, "--set-selections"); + pr(_("Skip invalid line: %s"), line); + continue; + } + line[i++] = '\0'; + while (i < len && isblank(line[i])) + i++; + + /* Delimit choice string in the line */ + if (i >= len) { + printf("[%s %s] ", PROGNAME, "--set-selections"); + pr(_("Skip invalid line: %s"), line); + continue; + } + choice = line + i; + + printf("[%s %s] ", PROGNAME, "--set-selections"); + alternative_set_selection(alt_map_obj, name, status, choice); + } + + alternative_map_free(alt_map_obj); +} + +static void +alternative_check_name(const char *name) +{ + if (strpbrk(name, "/ \t")) + error(_("alternative name (%s) must not contain '/' " + "and spaces"), name); +} + +static void +alternative_check_link(const char *linkname) +{ + if (linkname[0] != '/') + error(_("alternative link is not absolute as it should be: %s"), + linkname); +} + +static void +alternative_check_path(const char *file) +{ + if (!file || file[0] != '/') + error(_("alternative path is not absolute as it should be: %s"), + file); +} + +/** + * Check the alternative installation arguments. + * + * That the caller doesn't mix links between alternatives, doesn't mix + * alternatives between slave/master, and that the various parameters + * are fine. + */ +static void +alternative_check_install_args(struct alternative *inst_alt, + struct fileset *fileset) +{ + struct alternative_map *alt_map_links, *alt_map_parent; + struct alternative *found; + struct slave_link *sl; + + alternative_check_name(inst_alt->master_name); + alternative_check_link(inst_alt->master_link); + alternative_check_path(fileset->master_file); + + /* Load information about all alternatives to check for mistakes. */ + alt_map_links = alternative_map_new(NULL, NULL); + alt_map_parent = alternative_map_new(NULL, NULL); + alternative_map_load_tree(alt_map_links, alt_map_parent); + + found = alternative_map_find(alt_map_parent, inst_alt->master_name); + if (found && strcmp(found->master_name, inst_alt->master_name) != 0) { + error(_("alternative %s can't be master: it is a slave of %s"), + inst_alt->master_name, found->master_name); + } + + found = alternative_map_find(alt_map_links, inst_alt->master_link); + if (found && strcmp(found->master_name, inst_alt->master_name) != 0) { + found = alternative_map_find(alt_map_parent, + found->master_name); + error(_("alternative link %s is already managed by %s"), + inst_alt->master_link, found->master_name); + } + + if (pathname_is_missing(fileset->master_file)) + error(_("alternative path %s doesn't exist"), + fileset->master_file); + + for (sl = inst_alt->slaves; sl; sl = sl->next) { + const char *file = fileset_get_slave(fileset, sl->name); + + alternative_check_name(sl->name); + alternative_check_link(sl->link); + alternative_check_path(file); + + found = alternative_map_find(alt_map_parent, sl->name); + if (found && + strcmp(found->master_name, inst_alt->master_name) != 0) { + if (strcmp(found->master_name, sl->name) == 0) + error(_("alternative %s can't be slave of %s: " + "it is a master alternative"), + sl->name, inst_alt->master_name); + else + error(_("alternative %s can't be slave of %s: " + "it is a slave of %s"), + sl->name, inst_alt->master_name, + found->master_name); + } + + found = alternative_map_find(alt_map_links, sl->link); + if (found && + strcmp(found->master_name, inst_alt->master_name) != 0) { + error(_("alternative link %s is already " + "managed by %s"), sl->link, + found->master_name); + } + if (found) { + struct slave_link *sl2; + + for (sl2 = found->slaves; sl2; sl2 = sl2->next) + if (strcmp(sl2->link, sl->link) == 0) + break; + if (sl2 && strcmp(sl2->name, sl->name) != 0) + error(_("alternative link %s is already " + "managed by %s (slave of %s)"), + sl->link, sl2->name, + found->master_name); + } + } + + alternative_map_free(alt_map_links); + alternative_map_free(alt_map_parent); +} + +/* + * Main program + */ + +#define MISSING_ARGS(nb) (argc < i + nb + 1) + +int +main(int argc, char **argv) +{ + /* Alternative worked on. */ + struct alternative *a = NULL; + /* Alternative to install. */ + struct alternative *inst_alt = NULL; + /* Set of files to install in the alternative. */ + struct fileset *fileset = NULL; + /* Path of alternative we are offering. */ + char *path = NULL; + const char *current_choice = NULL; + const char *new_choice = NULL; + bool modifies_alt = false; + bool modifies_sys = false; + int i = 0; + + setlocale(LC_ALL, ""); + bindtextdomain(PACKAGE, LOCALEDIR); + textdomain(PACKAGE); + + admdir = admindir_init(); + + if (setvbuf(stdout, NULL, _IONBF, 0)) + syserr("setvbuf failed"); + + prog_path = argv[0]; + + for (i = 1; i < argc; i++) { + if (strstr(argv[i], "--") != argv[i]) { + error(_("unknown argument '%s'"), argv[i]); + } else if (strcmp("--help", argv[i]) == 0) { + usage(); + exit(0); + } else if (strcmp("--version", argv[i]) == 0) { + version(); + exit(0); + } else if (strcmp("--quiet", argv[i]) == 0) { + opt_verbose = OUTPUT_QUIET; + } else if (strcmp("--verbose", argv[i]) == 0) { + opt_verbose = OUTPUT_VERBOSE; + } else if (strcmp("--debug", argv[i]) == 0) { + opt_verbose = OUTPUT_DEBUG; + } else if (strcmp("--install", argv[i]) == 0) { + char *prio_str, *prio_end; + long prio; + + set_action(ACTION_INSTALL); + if (MISSING_ARGS(4)) + badusage(_("--install needs <link> <name> " + "<path> <priority>")); + + prio_str = argv[i + 4]; + + if (strcmp(argv[i+1], argv[i+3]) == 0) + badusage(_("<link> and <path> can't be the same")); + errno = 0; + prio = strtol(prio_str, &prio_end, 10); + if (prio_str == prio_end || *prio_end != '\0') + badusage(_("priority must be an integer")); + if (prio < INT_MIN || prio > INT_MAX || errno == ERANGE) + badusage(_("priority is out of range")); + + a = alternative_new(argv[i + 2]); + inst_alt = alternative_new(argv[i + 2]); + alternative_set_status(inst_alt, ALT_ST_AUTO); + alternative_set_link(inst_alt, argv[i + 1]); + fileset = fileset_new(argv[i + 3], prio); + + i += 4; + } else if (strcmp("--remove", argv[i]) == 0 || + strcmp("--set", argv[i]) == 0) { + set_action_from_name(argv[i] + 2); + if (MISSING_ARGS(2)) + badusage(_("--%s needs <name> <path>"), argv[i] + 2); + + a = alternative_new(argv[i + 1]); + path = xstrdup(argv[i + 2]); + + alternative_check_name(a->master_name); + alternative_check_path(path); + + i += 2; + } else if (strcmp("--display", argv[i]) == 0 || + strcmp("--query", argv[i]) == 0 || + strcmp("--auto", argv[i]) == 0 || + strcmp("--config", argv[i]) == 0 || + strcmp("--list", argv[i]) == 0 || + strcmp("--remove-all", argv[i]) == 0) { + set_action_from_name(argv[i] + 2); + if (MISSING_ARGS(1)) + badusage(_("--%s needs <name>"), argv[i] + 2); + a = alternative_new(argv[i + 1]); + + alternative_check_name(a->master_name); + + i++; + } else if (strcmp("--all", argv[i]) == 0 || + strcmp("--get-selections", argv[i]) == 0 || + strcmp("--set-selections", argv[i]) == 0) { + set_action_from_name(argv[i] + 2); + } else if (strcmp("--slave", argv[i]) == 0) { + const char *slink, *sname, *spath; + struct slave_link *sl; + + if (action == ACTION_NONE || action != ACTION_INSTALL) + badusage(_("--slave only allowed with --install")); + if (MISSING_ARGS(3)) + badusage(_("--slave needs <link> <name> <path>")); + + slink = argv[i + 1]; + sname = argv[i + 2]; + spath = argv[i + 3]; + + if (strcmp(slink, spath) == 0) + badusage(_("<link> and <path> can't be the same")); + if (strcmp(inst_alt->master_name, sname) == 0) + badusage(_("name %s is both primary and slave"), + sname); + if (strcmp(slink, inst_alt->master_link) == 0) + badusage(_("link %s is both primary and slave"), + slink); + if (alternative_has_slave(inst_alt, sname)) + badusage(_("duplicate slave name %s"), sname); + + for (sl = inst_alt->slaves; sl; sl = sl->next) { + const char *linkname = sl->link; + if (linkname == NULL) + linkname = ""; + if (strcmp(linkname, slink) == 0) + badusage(_("duplicate slave link %s"), + slink); + } + + alternative_add_slave(inst_alt, sname, slink); + fileset_add_slave(fileset, sname, spath); + + i+= 3; + } else if (strcmp("--log", argv[i]) == 0) { + if (MISSING_ARGS(1)) + badusage(_("--%s needs a <file> argument"), "log"); + log_file = argv[i + 1]; + i++; + } else if (strcmp("--altdir", argv[i]) == 0) { + if (MISSING_ARGS(1)) + badusage(_("--%s needs a <directory> argument"), "log"); + altdir = argv[i + 1]; + i++; + } else if (strcmp("--admindir", argv[i]) == 0) { + if (MISSING_ARGS(1)) + badusage(_("--%s needs a <directory> argument"), "log"); + admdir = argv[i + 1]; + i++; + } else if (strcmp("--skip-auto", argv[i]) == 0) { + opt_skip_auto = 1; + } else if (strcmp("--force", argv[i]) == 0) { + opt_force = 1; + } else { + badusage(_("unknown option '%s'"), argv[i]); + } + } + + if (action == ACTION_NONE) + badusage(_("need --display, --query, --list, --get-selections, " + "--config, --set, --set-selections, --install, " + "--remove, --all, --remove-all or --auto")); + + /* The following actions might modify the current alternative. */ + if (action == ACTION_SET || + action == ACTION_AUTO || + action == ACTION_CONFIG || + action == ACTION_REMOVE || + action == ACTION_REMOVE_ALL || + action == ACTION_INSTALL) + modifies_alt = true; + + /* The following actions might modify the system somehow. */ + if (modifies_alt || + action == ACTION_CONFIG_ALL || + action == ACTION_SET_SELECTIONS) + modifies_sys = true; + + if (action == ACTION_INSTALL) + alternative_check_install_args(inst_alt, fileset); + + if (action == ACTION_DISPLAY || + action == ACTION_QUERY || + action == ACTION_LIST || + action == ACTION_SET || + action == ACTION_AUTO || + action == ACTION_CONFIG || + action == ACTION_REMOVE_ALL) { + /* Load the alternative info, stop on failure. */ + if (!alternative_load(a, ALTDB_WARN_PARSER)) + error(_("no alternatives for %s"), a->master_name); + } else if (action == ACTION_REMOVE) { + /* FIXME: Be consistent for now with the case when we + * try to remove a non-existing path from an existing + * link group file. */ + if (!alternative_load(a, ALTDB_WARN_PARSER)) { + verbose(_("no alternatives for %s"), a->master_name); + exit(0); + } + } else if (action == ACTION_INSTALL) { + /* Load the alternative info, ignore failures. */ + alternative_load(a, ALTDB_WARN_PARSER); + } + + if (modifies_sys) + log_msg("run with %s", get_argv_string(argc, argv)); + + if (modifies_alt) { + current_choice = alternative_get_current(a); + alternative_select_mode(a, current_choice); + } + + /* Handle actions. */ + if (action == ACTION_CONFIG_ALL) { + alternative_config_all(); + } else if (action == ACTION_GET_SELECTIONS) { + alternative_get_selections(); + } else if (action == ACTION_SET_SELECTIONS) { + alternative_set_selections(stdin, _("<standard input>")); + } else if (action == ACTION_DISPLAY) { + alternative_display_user(a); + } else if (action == ACTION_QUERY) { + alternative_display_query(a); + } else if (action == ACTION_LIST) { + alternative_display_list(a); + } else if (action == ACTION_SET) { + new_choice = alternative_set_manual(a, path); + } else if (action == ACTION_AUTO) { + new_choice = alternative_set_auto(a); + } else if (action == ACTION_CONFIG) { + new_choice = alternative_config(a, current_choice); + } else if (action == ACTION_REMOVE) { + new_choice = alternative_remove(a, current_choice, path); + } else if (action == ACTION_REMOVE_ALL) { + alternative_choices_free(a); + } else if (action == ACTION_INSTALL) { + if (a->master_link) { + /* Alternative already exists, check if anything got + * updated. */ + alternative_evolve(a, inst_alt, current_choice, fileset); + } else { + /* Alternative doesn't exist, create from parameters. */ + alternative_free(a); + a = inst_alt; + } + alternative_add_choice(a, fileset); + if (a->status == ALT_ST_AUTO) { + new_choice = alternative_get_best(a)->master_file; + } else { + verbose(_("automatic updates of %s/%s are disabled; " + "leaving it alone"), altdir, a->master_name); + verbose(_("to return to automatic updates use " + "'%s --auto %s'"), PROGNAME, a->master_name); + } + } + + if (modifies_alt) + alternative_update(a, current_choice, new_choice); + + return 0; +} |