diff options
Diffstat (limited to '')
| -rw-r--r-- | src/delta/delta.c | 637 | ||||
| -rw-r--r-- | src/delta/meson.build | 9 |
2 files changed, 646 insertions, 0 deletions
diff --git a/src/delta/delta.c b/src/delta/delta.c new file mode 100644 index 0000000..3337b7f --- /dev/null +++ b/src/delta/delta.c @@ -0,0 +1,637 @@ +/* SPDX-License-Identifier: LGPL-2.1-or-later */ + +#include <errno.h> +#include <getopt.h> +#include <sys/prctl.h> +#include <unistd.h> + +#include "alloc-util.h" +#include "build.h" +#include "chase.h" +#include "dirent-util.h" +#include "fd-util.h" +#include "fs-util.h" +#include "glyph-util.h" +#include "hashmap.h" +#include "log.h" +#include "main-func.h" +#include "nulstr-util.h" +#include "pager.h" +#include "parse-argument.h" +#include "parse-util.h" +#include "path-util.h" +#include "pretty-print.h" +#include "process-util.h" +#include "signal-util.h" +#include "stat-util.h" +#include "string-util.h" +#include "strv.h" +#include "terminal-util.h" + +static const char prefixes[] = + "/etc\0" + "/run\0" + "/usr/local/lib\0" + "/usr/local/share\0" + "/usr/lib\0" + "/usr/share\0" + ; + +static const char suffixes[] = + "sysctl.d\0" + "tmpfiles.d\0" + "modules-load.d\0" + "binfmt.d\0" + "systemd/system\0" + "systemd/user\0" + "systemd/system-preset\0" + "systemd/user-preset\0" + "udev/rules.d\0" + "modprobe.d\0"; + +static const char have_dropins[] = + "systemd/system\0" + "systemd/user\0"; + +static PagerFlags arg_pager_flags = 0; +static int arg_diff = -1; + +static enum { + SHOW_MASKED = 1 << 0, + SHOW_EQUIVALENT = 1 << 1, + SHOW_REDIRECTED = 1 << 2, + SHOW_OVERRIDDEN = 1 << 3, + SHOW_UNCHANGED = 1 << 4, + SHOW_EXTENDED = 1 << 5, + + SHOW_DEFAULTS = + (SHOW_MASKED | SHOW_EQUIVALENT | SHOW_REDIRECTED | SHOW_OVERRIDDEN | SHOW_EXTENDED) +} arg_flags = 0; + +static int equivalent(const char *a, const char *b) { + _cleanup_free_ char *x = NULL, *y = NULL; + int r; + + r = chase(a, NULL, CHASE_TRAIL_SLASH, &x, NULL); + if (r < 0) + return r; + + r = chase(b, NULL, CHASE_TRAIL_SLASH, &y, NULL); + if (r < 0) + return r; + + return path_equal(x, y); +} + +static int notify_override_masked(const char *top, const char *bottom) { + if (!(arg_flags & SHOW_MASKED)) + return 0; + + printf("%s%s%s %s %s %s\n", + ansi_highlight_red(), "[MASKED]", ansi_normal(), + top, special_glyph(SPECIAL_GLYPH_ARROW_RIGHT), bottom); + return 1; +} + +static int notify_override_equivalent(const char *top, const char *bottom) { + if (!(arg_flags & SHOW_EQUIVALENT)) + return 0; + + printf("%s%s%s %s %s %s\n", + ansi_highlight_green(), "[EQUIVALENT]", ansi_normal(), + top, special_glyph(SPECIAL_GLYPH_ARROW_RIGHT), bottom); + return 1; +} + +static int notify_override_redirected(const char *top, const char *bottom) { + if (!(arg_flags & SHOW_REDIRECTED)) + return 0; + + printf("%s%s%s %s %s %s\n", + ansi_highlight(), "[REDIRECTED]", ansi_normal(), + top, special_glyph(SPECIAL_GLYPH_ARROW_RIGHT), bottom); + return 1; +} + +static int notify_override_overridden(const char *top, const char *bottom) { + if (!(arg_flags & SHOW_OVERRIDDEN)) + return 0; + + printf("%s%s%s %s %s %s\n", + ansi_highlight(), "[OVERRIDDEN]", ansi_normal(), + top, special_glyph(SPECIAL_GLYPH_ARROW_RIGHT), bottom); + return 1; +} + +static int notify_override_extended(const char *top, const char *bottom) { + if (!(arg_flags & SHOW_EXTENDED)) + return 0; + + printf("%s%s%s %s %s %s\n", + ansi_highlight(), "[EXTENDED]", ansi_normal(), + top, special_glyph(SPECIAL_GLYPH_ARROW_RIGHT), bottom); + return 1; +} + +static int notify_override_unchanged(const char *f) { + if (!(arg_flags & SHOW_UNCHANGED)) + return 0; + + printf("[UNCHANGED] %s\n", f); + return 1; +} + +static int found_override(const char *top, const char *bottom) { + _cleanup_free_ char *dest = NULL; + pid_t pid; + int r; + + assert(top); + assert(bottom); + + if (null_or_empty_path(top) > 0) + return notify_override_masked(top, bottom); + + r = readlink_malloc(top, &dest); + if (r >= 0) { + if (equivalent(dest, bottom) > 0) + return notify_override_equivalent(top, bottom); + else + return notify_override_redirected(top, bottom); + } + + r = notify_override_overridden(top, bottom); + if (!arg_diff) + return r; + + putchar('\n'); + + fflush(stdout); + + r = safe_fork("(diff)", FORK_RESET_SIGNALS|FORK_DEATHSIG_SIGTERM|FORK_CLOSE_ALL_FDS|FORK_RLIMIT_NOFILE_SAFE|FORK_LOG, &pid); + if (r < 0) + return r; + if (r == 0) { + execlp("diff", "diff", "-us", "--", bottom, top, NULL); + log_open(); + log_error_errno(errno, "Failed to execute diff: %m"); + _exit(EXIT_FAILURE); + } + + (void) wait_for_terminate_and_check("diff", pid, WAIT_LOG_ABNORMAL); + putchar('\n'); + + return r; +} + +static int enumerate_dir_d( + OrderedHashmap *top, + OrderedHashmap *bottom, + OrderedHashmap *drops, + const char *toppath, const char *drop) { + + _cleanup_free_ char *unit = NULL; + _cleanup_free_ char *path = NULL; + _cleanup_strv_free_ char **list = NULL; + char *c; + int r; + + assert(!endswith(drop, "/")); + + path = path_join(toppath, drop); + if (!path) + return -ENOMEM; + + log_debug("Looking at %s", path); + + unit = strdup(drop); + if (!unit) + return -ENOMEM; + + c = strrchr(unit, '.'); + if (!c) + return -EINVAL; + *c = 0; + + r = get_files_in_directory(path, &list); + if (r < 0) + return log_error_errno(r, "Failed to enumerate %s: %m", path); + + strv_sort(list); + + STRV_FOREACH(file, list) { + OrderedHashmap *h; + int k; + char *p; + char *d; + + if (!endswith(*file, ".conf")) + continue; + + p = path_join(path, *file); + if (!p) + return -ENOMEM; + d = p + strlen(toppath) + 1; + + log_debug("Adding at top: %s %s %s", d, special_glyph(SPECIAL_GLYPH_ARROW_RIGHT), p); + k = ordered_hashmap_put(top, d, p); + if (k >= 0) { + p = strdup(p); + if (!p) + return -ENOMEM; + d = p + strlen(toppath) + 1; + } else if (k != -EEXIST) { + free(p); + return k; + } + + log_debug("Adding at bottom: %s %s %s", d, special_glyph(SPECIAL_GLYPH_ARROW_RIGHT), p); + free(ordered_hashmap_remove(bottom, d)); + k = ordered_hashmap_put(bottom, d, p); + if (k < 0) { + free(p); + return k; + } + + h = ordered_hashmap_get(drops, unit); + if (!h) { + h = ordered_hashmap_new(&string_hash_ops); + if (!h) + return -ENOMEM; + ordered_hashmap_put(drops, unit, h); + unit = strdup(unit); + if (!unit) + return -ENOMEM; + } + + p = strdup(p); + if (!p) + return -ENOMEM; + + log_debug("Adding to drops: %s %s %s %s %s", + unit, special_glyph(SPECIAL_GLYPH_ARROW_RIGHT), basename(p), special_glyph(SPECIAL_GLYPH_ARROW_RIGHT), p); + k = ordered_hashmap_put(h, basename(p), p); + if (k < 0) { + free(p); + if (k != -EEXIST) + return k; + } + } + return 0; +} + +static int enumerate_dir( + OrderedHashmap *top, + OrderedHashmap *bottom, + OrderedHashmap *drops, + const char *path, bool dropins) { + + _cleanup_closedir_ DIR *d = NULL; + _cleanup_strv_free_ char **files = NULL, **dirs = NULL; + size_t n_files = 0, n_dirs = 0; + int r; + + assert(top); + assert(bottom); + assert(drops); + assert(path); + + log_debug("Looking at %s", path); + + d = opendir(path); + if (!d) { + if (errno == ENOENT) + return 0; + + return log_error_errno(errno, "Failed to open %s: %m", path); + } + + FOREACH_DIRENT_ALL(de, d, return -errno) { + if (dropins && de->d_type == DT_DIR && endswith(de->d_name, ".d")) { + if (!GREEDY_REALLOC0(dirs, n_dirs + 2)) + return -ENOMEM; + + dirs[n_dirs] = strdup(de->d_name); + if (!dirs[n_dirs]) + return -ENOMEM; + n_dirs ++; + } + + if (!dirent_is_file(de)) + continue; + + if (!GREEDY_REALLOC0(files, n_files + 2)) + return -ENOMEM; + + files[n_files] = strdup(de->d_name); + if (!files[n_files]) + return -ENOMEM; + n_files ++; + } + + strv_sort(dirs); + strv_sort(files); + + STRV_FOREACH(t, dirs) { + r = enumerate_dir_d(top, bottom, drops, path, *t); + if (r < 0) + return r; + } + + STRV_FOREACH(t, files) { + _cleanup_free_ char *p = NULL; + + p = path_join(path, *t); + if (!p) + return -ENOMEM; + + log_debug("Adding at top: %s %s %s", basename(p), special_glyph(SPECIAL_GLYPH_ARROW_RIGHT), p); + r = ordered_hashmap_put(top, basename(p), p); + if (r >= 0) { + p = strdup(p); + if (!p) + return -ENOMEM; + } else if (r != -EEXIST) + return r; + + log_debug("Adding at bottom: %s %s %s", basename(p), special_glyph(SPECIAL_GLYPH_ARROW_RIGHT), p); + free(ordered_hashmap_remove(bottom, basename(p))); + r = ordered_hashmap_put(bottom, basename(p), p); + if (r < 0) + return r; + p = NULL; + } + + return 0; +} + +static int process_suffix(const char *suffix, const char *onlyprefix) { + char *f, *key; + OrderedHashmap *top, *bottom, *drops, *h; + int r = 0, k, n_found = 0; + bool dropins; + + assert(suffix); + assert(!startswith(suffix, "/")); + assert(!strstr(suffix, "//")); + + dropins = nulstr_contains(have_dropins, suffix); + + top = ordered_hashmap_new(&string_hash_ops); + bottom = ordered_hashmap_new(&string_hash_ops); + drops = ordered_hashmap_new(&string_hash_ops); + if (!top || !bottom || !drops) { + r = -ENOMEM; + goto finish; + } + + NULSTR_FOREACH(p, prefixes) { + _cleanup_free_ char *t = NULL; + + t = path_join(p, suffix); + if (!t) { + r = -ENOMEM; + goto finish; + } + + k = enumerate_dir(top, bottom, drops, t, dropins); + if (r == 0) + r = k; + } + + ORDERED_HASHMAP_FOREACH_KEY(f, key, top) { + char *o; + + o = ordered_hashmap_get(bottom, key); + assert(o); + + if (!onlyprefix || startswith(o, onlyprefix)) { + if (path_equal(o, f)) { + notify_override_unchanged(f); + } else { + k = found_override(f, o); + if (k < 0) + r = k; + else + n_found += k; + } + } + + h = ordered_hashmap_get(drops, key); + if (h) + ORDERED_HASHMAP_FOREACH(o, h) + if (!onlyprefix || startswith(o, onlyprefix)) + n_found += notify_override_extended(f, o); + } + +finish: + ordered_hashmap_free_free(top); + ordered_hashmap_free_free(bottom); + + ORDERED_HASHMAP_FOREACH_KEY(h, key, drops) { + ordered_hashmap_free_free(ordered_hashmap_remove(drops, key)); + ordered_hashmap_remove(drops, key); + free(key); + } + ordered_hashmap_free(drops); + + return r < 0 ? r : n_found; +} + +static int process_suffixes(const char *onlyprefix) { + int n_found = 0, r; + + NULSTR_FOREACH(n, suffixes) { + r = process_suffix(n, onlyprefix); + if (r < 0) + return r; + + n_found += r; + } + + return n_found; +} + +static int process_suffix_chop(const char *arg) { + assert(arg); + + if (!path_is_absolute(arg)) + return process_suffix(arg, NULL); + + /* Strip prefix from the suffix */ + NULSTR_FOREACH(p, prefixes) { + const char *suffix; + + suffix = startswith(arg, p); + if (suffix) { + suffix += strspn(suffix, "/"); + if (*suffix) + return process_suffix(suffix, p); + else + return process_suffixes(arg); + } + } + + return log_error_errno(SYNTHETIC_ERRNO(EINVAL), + "Invalid suffix specification %s.", arg); +} + +static int help(void) { + _cleanup_free_ char *link = NULL; + int r; + + r = terminal_urlify_man("systemd-delta", "1", &link); + if (r < 0) + return log_oom(); + + printf("%s [OPTIONS...] [SUFFIX...]\n\n" + "Find overridden configuration files.\n\n" + " -h --help Show this help\n" + " --version Show package version\n" + " --no-pager Do not pipe output into a pager\n" + " --diff[=1|0] Show a diff when overridden files differ\n" + " -t --type=LIST... Only display a selected set of override types\n" + "\nSee the %s for details.\n", + program_invocation_short_name, + link); + + return 0; +} + +static int parse_flags(const char *flag_str, int flags) { + for (;;) { + _cleanup_free_ char *word = NULL; + int r; + + r = extract_first_word(&flag_str, &word, ",", EXTRACT_DONT_COALESCE_SEPARATORS); + if (r < 0) + return r; + if (r == 0) + return flags; + + if (streq(word, "masked")) + flags |= SHOW_MASKED; + else if (streq(word, "equivalent")) + flags |= SHOW_EQUIVALENT; + else if (streq(word, "redirected")) + flags |= SHOW_REDIRECTED; + else if (streq(word, "overridden")) + flags |= SHOW_OVERRIDDEN; + else if (streq(word, "unchanged")) + flags |= SHOW_UNCHANGED; + else if (streq(word, "extended")) + flags |= SHOW_EXTENDED; + else if (streq(word, "default")) + flags |= SHOW_DEFAULTS; + else + return -EINVAL; + } +} + +static int parse_argv(int argc, char *argv[]) { + + enum { + ARG_NO_PAGER = 0x100, + ARG_DIFF, + ARG_VERSION + }; + + static const struct option options[] = { + { "help", no_argument, NULL, 'h' }, + { "version", no_argument, NULL, ARG_VERSION }, + { "no-pager", no_argument, NULL, ARG_NO_PAGER }, + { "diff", optional_argument, NULL, ARG_DIFF }, + { "type", required_argument, NULL, 't' }, + {} + }; + + int c, r; + + assert(argc >= 1); + assert(argv); + + while ((c = getopt_long(argc, argv, "ht:", options, NULL)) >= 0) + + switch (c) { + + case 'h': + return help(); + + case ARG_VERSION: + return version(); + + case ARG_NO_PAGER: + arg_pager_flags |= PAGER_DISABLE; + break; + + case 't': { + int f; + f = parse_flags(optarg, arg_flags); + if (f < 0) + return log_error_errno(SYNTHETIC_ERRNO(EINVAL), + "Failed to parse flags field."); + arg_flags = f; + break; + } + + case ARG_DIFF: + r = parse_boolean_argument("--diff", optarg, NULL); + if (r < 0) + return r; + arg_diff = r; + break; + + case '?': + return -EINVAL; + + default: + assert_not_reached(); + } + + return 1; +} + +static int run(int argc, char *argv[]) { + int r, k, n_found = 0; + + log_setup(); + + r = parse_argv(argc, argv); + if (r <= 0) + return r; + + if (arg_flags == 0) + arg_flags = SHOW_DEFAULTS; + + if (arg_diff < 0) + arg_diff = !!(arg_flags & SHOW_OVERRIDDEN); + else if (arg_diff) + arg_flags |= SHOW_OVERRIDDEN; + + pager_open(arg_pager_flags); + + if (optind < argc) { + for (int i = optind; i < argc; i++) { + path_simplify(argv[i]); + + k = process_suffix_chop(argv[i]); + if (k < 0) + r = k; + else + n_found += k; + } + + } else { + k = process_suffixes(NULL); + if (k < 0) + r = k; + else + n_found += k; + } + + if (r >= 0) + printf("%s%i overridden configuration files found.\n", n_found ? "\n" : "", n_found); + return r; +} + +DEFINE_MAIN_FUNCTION(run); diff --git a/src/delta/meson.build b/src/delta/meson.build new file mode 100644 index 0000000..31c4be2 --- /dev/null +++ b/src/delta/meson.build @@ -0,0 +1,9 @@ +# SPDX-License-Identifier: LGPL-2.1-or-later + +executables += [ + executable_template + { + 'name' : 'systemd-delta', + 'public' : true, + 'sources' : files('delta.c'), + }, +] |