diff options
Diffstat (limited to 'src/xdg-autostart-generator/xdg-autostart-service.c')
| -rw-r--r-- | src/xdg-autostart-generator/xdg-autostart-service.c | 695 |
1 files changed, 695 insertions, 0 deletions
diff --git a/src/xdg-autostart-generator/xdg-autostart-service.c b/src/xdg-autostart-generator/xdg-autostart-service.c new file mode 100644 index 0000000..480d100 --- /dev/null +++ b/src/xdg-autostart-generator/xdg-autostart-service.c @@ -0,0 +1,695 @@ +/* SPDX-License-Identifier: LGPL-2.1-or-later */ + +#include <errno.h> +#include <stdio.h> +#include <unistd.h> + +#include "xdg-autostart-service.h" + +#include "conf-parser.h" +#include "escape.h" +#include "fd-util.h" +#include "fileio.h" +#include "generator.h" +#include "log.h" +#include "nulstr-util.h" +#include "parse-util.h" +#include "path-util.h" +#include "specifier.h" +#include "string-util.h" +#include "strv.h" +#include "unit-name.h" +#include "user-util.h" + +XdgAutostartService* xdg_autostart_service_free(XdgAutostartService *s) { + if (!s) + return NULL; + + free(s->name); + free(s->path); + free(s->description); + + free(s->type); + free(s->exec_string); + free(s->working_directory); + + strv_free(s->only_show_in); + strv_free(s->not_show_in); + + free(s->try_exec); + free(s->autostart_condition); + free(s->kde_autostart_condition); + + free(s->gnome_autostart_phase); + + return mfree(s); +} + +char *xdg_autostart_service_translate_name(const char *name) { + _cleanup_free_ char *c = NULL, *escaped = NULL; + char *res; + + c = strdup(name); + if (!c) + return NULL; + + res = endswith(c, ".desktop"); + if (res) + *res = '\0'; + + escaped = unit_name_escape(c); + if (!escaped) + return NULL; + + return strjoin("app-", escaped, "@autostart.service"); +} + +static int xdg_config_parse_bool( + const char *unit, + const char *filename, + unsigned line, + const char *section, + unsigned section_line, + const char *lvalue, + int ltype, + const char *rvalue, + void *data, + void *userdata) { + + bool *b = ASSERT_PTR(data); + int r; + + assert(filename); + assert(lvalue); + assert(rvalue); + + r = parse_boolean(rvalue); + if (r < 0) + return log_syntax(unit, LOG_ERR, filename, line, SYNTHETIC_ERRNO(EINVAL), "Invalid value for boolean: %s", rvalue); + *b = r; + return 0; +} + +/* Unescapes the string in-place, returns non-zero status on error. */ +static int xdg_unescape_string( + const char *unit, + const char *filename, + int line, + char *str) { + + char *in; + char *out; + + assert(str); + + in = out = str; + + for (; *in; in++, out++) { + if (*in == '\\') { + /* Move forward, and ensure it is a valid escape. */ + in++; + + switch (*in) { + case 's': + *out = ' '; + break; + case 'n': + *out = '\n'; + break; + case 't': + *out = '\t'; + break; + case 'r': + *out = '\r'; + break; + case '\\': + *out = '\\'; + break; + case ';': + /* Technically only permitted for strv. */ + *out = ';'; + break; + default: + return log_syntax(unit, LOG_ERR, filename, line, SYNTHETIC_ERRNO(EINVAL), "Undefined escape sequence \\%c.", *in); + } + + continue; + } + + *out = *in; + } + *out = '\0'; + + return 0; +} + +/* Note: We do not bother with unescaping the strings, hence the _raw postfix. */ +static int xdg_config_parse_string( + const char *unit, + const char *filename, + unsigned line, + const char *section, + unsigned section_line, + const char *lvalue, + int ltype, + const char *rvalue, + void *data, + void *userdata) { + + _cleanup_free_ char *res = NULL; + char **out = ASSERT_PTR(data); + int r; + + assert(filename); + assert(lvalue); + assert(rvalue); + + /* XDG does not allow duplicate definitions. */ + if (*out) { + log_syntax(unit, LOG_WARNING, filename, line, 0, "Key %s was defined multiple times, ignoring.", lvalue); + return 0; + } + + res = strdup(rvalue); + if (!res) + return log_oom(); + + r = xdg_unescape_string(unit, filename, line, res); + if (r < 0) + return r; + + *out = TAKE_PTR(res); + return 0; +} + +static int strv_strndup_unescape_and_push( + const char *unit, + const char *filename, + unsigned line, + char ***sv, + size_t *n, + const char *start, + const char *end) { + + if (end == start) + return 0; + + _cleanup_free_ char *copy = NULL; + int r; + + copy = strndup(start, end - start); + if (!copy) + return log_oom(); + + r = xdg_unescape_string(unit, filename, line, copy); + if (r < 0) + return r; + + if (!GREEDY_REALLOC(*sv, *n + 2)) /* One extra for NULL */ + return log_oom(); + + (*sv)[*n] = TAKE_PTR(copy); + (*sv)[*n + 1] = NULL; + (*n)++; + + return 0; +} + +static int xdg_config_parse_strv( + const char *unit, + const char *filename, + unsigned line, + const char *section, + unsigned section_line, + const char *lvalue, + int ltype, + const char *rvalue, + void *data, + void *userdata) { + + char ***ret_sv = ASSERT_PTR(data); + int r; + + assert(filename); + assert(lvalue); + assert(rvalue); + + /* XDG does not allow duplicate definitions. */ + if (*ret_sv) { + log_syntax(unit, LOG_WARNING, filename, line, 0, "Key %s was already defined, ignoring.", lvalue); + return 0; + } + + size_t n = 0; + _cleanup_strv_free_ char **sv = NULL; + + if (!GREEDY_REALLOC0(sv, 1)) + return log_oom(); + + /* We cannot use strv_split because it does not handle escaping correctly. */ + const char *start = rvalue, *end; + + for (end = start; *end; end++) { + if (*end == '\\') { + /* Move forward, and ensure it is a valid escape. */ + end++; + if (!strchr("sntr\\;", *end)) { + log_syntax(unit, LOG_WARNING, filename, line, 0, "Undefined escape sequence \\%c.", *end); + return 0; + } + continue; + } + + if (*end == ';') { + r = strv_strndup_unescape_and_push(unit, filename, line, + &sv, &n, + start, end); + if (r < 0) + return r; + + start = end + 1; + } + } + + /* Handle the trailing entry after the last separator */ + r = strv_strndup_unescape_and_push(unit, filename, line, + &sv, &n, + start, end); + if (r < 0) + return r; + + *ret_sv = TAKE_PTR(sv); + return 0; +} + +static int xdg_config_item_table_lookup( + const void *table, + const char *section, + const char *lvalue, + ConfigParserCallback *ret_func, + int *ret_ltype, + void **ret_data, + void *userdata) { + + assert(lvalue); + + /* Ignore any keys with [] as those are translations. */ + if (strchr(lvalue, '[')) { + *ret_func = NULL; + *ret_ltype = 0; + *ret_data = NULL; + return 1; + } + + return config_item_table_lookup(table, section, lvalue, ret_func, ret_ltype, ret_data, userdata); +} + +XdgAutostartService *xdg_autostart_service_parse_desktop(const char *path) { + _cleanup_(xdg_autostart_service_freep) XdgAutostartService *service = NULL; + int r; + + service = new0(XdgAutostartService, 1); + if (!service) + return NULL; + + service->path = strdup(path); + if (!service->path) + return NULL; + + const ConfigTableItem items[] = { + { "Desktop Entry", "Name", xdg_config_parse_string, 0, &service->description }, + { "Desktop Entry", "Exec", xdg_config_parse_string, 0, &service->exec_string }, + { "Desktop Entry", "Path", xdg_config_parse_string, 0, &service->working_directory }, + { "Desktop Entry", "TryExec", xdg_config_parse_string, 0, &service->try_exec }, + { "Desktop Entry", "Type", xdg_config_parse_string, 0, &service->type }, + { "Desktop Entry", "OnlyShowIn", xdg_config_parse_strv, 0, &service->only_show_in }, + { "Desktop Entry", "NotShowIn", xdg_config_parse_strv, 0, &service->not_show_in }, + { "Desktop Entry", "Hidden", xdg_config_parse_bool, 0, &service->hidden }, + { "Desktop Entry", "AutostartCondition", xdg_config_parse_string, 0, &service->autostart_condition }, + { "Desktop Entry", "X-KDE-autostart-condition", xdg_config_parse_string, 0, &service->kde_autostart_condition }, + { "Desktop Entry", "X-GNOME-Autostart-Phase", xdg_config_parse_string, 0, &service->gnome_autostart_phase }, + { "Desktop Entry", "X-systemd-skip", xdg_config_parse_bool, 0, &service->systemd_skip }, + + /* Common entries that we do not use currently. */ + { "Desktop Entry", "Categories", NULL, 0, NULL}, + { "Desktop Entry", "Comment", NULL, 0, NULL}, + { "Desktop Entry", "DBusActivatable", NULL, 0, NULL}, + { "Desktop Entry", "Encoding", NULL, 0, NULL}, + { "Desktop Entry", "GenericName", NULL, 0, NULL}, + { "Desktop Entry", "Icon", NULL, 0, NULL}, + { "Desktop Entry", "Keywords", NULL, 0, NULL}, + { "Desktop Entry", "MimeType", NULL, 0, NULL}, + { "Desktop Entry", "NoDisplay", NULL, 0, NULL}, + { "Desktop Entry", "StartupNotify", NULL, 0, NULL}, + { "Desktop Entry", "StartupWMClass", NULL, 0, NULL}, + { "Desktop Entry", "Terminal", NULL, 0, NULL}, + { "Desktop Entry", "URL", NULL, 0, NULL}, + { "Desktop Entry", "Version", NULL, 0, NULL}, + {} + }; + + r = config_parse(NULL, service->path, NULL, + "Desktop Entry\0", + xdg_config_item_table_lookup, items, + CONFIG_PARSE_RELAXED | CONFIG_PARSE_WARN, + service, + NULL); + /* If parsing failed, only hide the file so it will still mask others. */ + if (r < 0) { + log_warning_errno(r, "Failed to parse %s, ignoring it", service->path); + service->hidden = true; + } + + return TAKE_PTR(service); +} + +int xdg_autostart_format_exec_start( + const char *exec, + char **ret_exec_start) { + + _cleanup_strv_free_ char **exec_split = NULL; + char *res; + size_t n, i; + bool first_arg; + int r; + + /* + * Unfortunately, there is a mismatch between systemd's idea of $PATH and XDGs. I.e. we need to + * ensure that we have an absolute path to support cases where $PATH has been modified from the + * default set. + * + * Note that this is only needed for development environments though; so while it is important, this + * should have no effect in production environments. + * + * To be compliant with the XDG specification, we also need to strip certain parameters and + * such. Doing so properly makes parsing the command line unavoidable. + * + * NOTE: Technically, XDG only specifies " as quotes, while this also accepts '. + */ + r = strv_split_full(&exec_split, exec, NULL, EXTRACT_UNQUOTE | EXTRACT_RELAX); + if (r < 0) + return r; + + if (strv_isempty(exec_split)) + return log_warning_errno(SYNTHETIC_ERRNO(EINVAL), "Exec line is empty"); + + first_arg = true; + for (i = n = 0; exec_split[i]; i++) { + _cleanup_free_ char *c = NULL, *raw = NULL, *percent = NULL, *tilde_expanded = NULL; + ssize_t l; + + l = cunescape(exec_split[i], 0, &c); + if (l < 0) + return log_debug_errno(l, "Failed to unescape '%s': %m", exec_split[i]); + + if (first_arg) { + _cleanup_free_ char *executable = NULL; + + /* This is the executable, find it in $PATH */ + first_arg = false; + r = find_executable(c, &executable); + if (r < 0) + return log_info_errno(r, "Exec binary '%s' does not exist: %m", c); + + free_and_replace(exec_split[n++], executable); + continue; + } + + /* + * Remove any standardised XDG fields; we assume they never appear as part of another + * argument as that just does not make any sense as they can be empty (GLib will e.g. turn + * "%f" into an empty argument). Other implementations may handle this differently. + */ + if (STR_IN_SET(c, + "%f", "%F", + "%u", "%U", + "%d", "%D", + "%n", "%N", + "%i", /* Location of icon, could be implemented. */ + "%c", /* Translated application name, could be implemented. */ + "%k", /* Location of desktop file, could be implemented. */ + "%v", + "%m" + )) + continue; + + /* + * %% -> % and then % -> %% means that we correctly quote any % and also quote any left over + * (and invalid) % specifier from the desktop file. + */ + raw = strreplace(c, "%%", "%"); + if (!raw) + return log_oom(); + percent = strreplace(raw, "%", "%%"); + if (!percent) + return log_oom(); + + /* + * Expand ~ if it comes at the beginning of an argument to form a path. + * + * The specification does not mandate this, but we do it anyway for compatibility with + * older KDE code, which supported a more shell-like syntax for users making custom entries. + */ + if (percent[0] == '~' && (isempty(percent + 1) || path_is_absolute(percent + 1))) { + _cleanup_free_ char *home = NULL; + + r = get_home_dir(&home); + if (r < 0) + return r; + + tilde_expanded = path_join(home, &percent[1]); + if (!tilde_expanded) + return log_oom(); + free_and_replace(exec_split[n++], tilde_expanded); + } else + free_and_replace(exec_split[n++], percent); + } + for (; exec_split[n]; n++) + exec_split[n] = mfree(exec_split[n]); + + res = quote_command_line(exec_split, SHELL_ESCAPE_EMPTY); + if (!res) + return log_oom(); + + *ret_exec_start = res; + return 0; +} + +static int xdg_autostart_generate_desktop_condition( + const XdgAutostartService *service, + FILE *f, + const char *test_binary, + const char *condition) { + + int r; + + /* Generate an ExecCondition for GNOME autostart condition */ + if (!isempty(condition)) { + _cleanup_free_ char *gnome_autostart_condition_path = NULL, *e_autostart_condition = NULL; + + r = find_executable(test_binary, &gnome_autostart_condition_path); + if (r < 0) { + log_full_errno(r == -ENOENT ? LOG_DEBUG : LOG_WARNING, r, + "%s: ExecCondition executable %s not found, unit will not be started automatically: %m", + service->path, test_binary); + fprintf(f, "# ExecCondition using %s skipped due to missing binary.\n", test_binary); + return 0; + } + + e_autostart_condition = cescape(condition); + if (!e_autostart_condition) + return log_oom(); + + log_debug("%s: ExecCondition converted to %s --condition \"%s\"%s", + service->path, gnome_autostart_condition_path, e_autostart_condition, + special_glyph(SPECIAL_GLYPH_ELLIPSIS)); + + fprintf(f, + "ExecCondition=%s --condition \"%s\"\n", + gnome_autostart_condition_path, + e_autostart_condition); + } + + return 0; +} + +int xdg_autostart_service_generate_unit( + const XdgAutostartService *service, + const char *dest) { + + _cleanup_free_ char *path_escaped = NULL, *exec_start = NULL; + _cleanup_fclose_ FILE *f = NULL; + _cleanup_strv_free_ char **only_show_in = NULL, **not_show_in = NULL; + int r; + + assert(service); + + /* Nothing to do for hidden services. */ + if (service->hidden) { + log_debug("%s: not generating unit, entry is hidden.", service->path); + return 0; + } + + if (service->systemd_skip) { + log_debug("%s: not generating unit, marked as skipped by generator.", service->path); + return 0; + } + + /* Nothing to do if type is not Application. */ + if (!streq_ptr(service->type, "Application")) { + log_debug("%s: not generating unit, Type=%s is not supported.", service->path, service->type); + return 0; + } + + if (!service->exec_string) { + log_warning("%s: not generating unit, no Exec= line.", service->path); + return 0; + } + + if (service->only_show_in) { + only_show_in = strv_copy(service->only_show_in); + if (!only_show_in) + return log_oom(); + } + + if (service->not_show_in) { + not_show_in = strv_copy(service->not_show_in); + if (!not_show_in) + return log_oom(); + } + + /* The TryExec key cannot be checked properly from the systemd unit, it is trivial to check using + * find_executable though. */ + if (service->try_exec) { + r = find_executable(service->try_exec, NULL); + if (r < 0) { + log_full_errno(r == -ENOENT ? LOG_DEBUG : LOG_WARNING, r, + "%s: not generating unit, could not find TryExec= binary %s: %m", + service->path, service->try_exec); + return 0; + } + } + + r = xdg_autostart_format_exec_start(service->exec_string, &exec_start); + if (r < 0) { + log_full_errno(r == -ENOENT ? LOG_INFO : LOG_WARNING, r, + r == -ENOENT ? "%s: not generating unit, executable specified in Exec= does not exist." + : "%s: not generating unit, error parsing Exec= line: %m", + service->path); + return 0; + } + + if (service->gnome_autostart_phase) { + /* There is no explicit value for the "Application" phase. + * + * On GNOME secondary startup mechanism handles desktop files with startup phases set. + * We want to mark these as "NotShowIn=GNOME" + * + * If that means no-one will load them, we can get skip it entirely. + */ + if (strv_contains(only_show_in, "GNOME")) { + strv_remove(only_show_in, "GNOME"); + + if (strv_isempty(only_show_in)) { + log_debug("%s: GNOME startup phases are handled separately. Skipping.", + service->path); + return 0; + } + } + log_debug("%s: GNOME startup phases are handled separately, marking as NotShowIn=GNOME.", + service->path); + + if (strv_extend(¬_show_in, "GNOME") < 0) + return log_oom(); + } + + path_escaped = specifier_escape(service->path); + if (!path_escaped) + return log_oom(); + + r = generator_open_unit_file(dest, /* source = */ NULL, service->name, &f); + if (r < 0) + return r; + + fprintf(f, + "[Unit]\n" + "Documentation=man:systemd-xdg-autostart-generator(8)\n" + "SourcePath=%s\n" + "PartOf=graphical-session.target\n\n", + path_escaped); + + if (service->description) { + _cleanup_free_ char *t = NULL; + + t = specifier_escape(service->description); + if (!t) + return log_oom(); + + fprintf(f, "Description=%s\n", t); + } + + /* Only start after the session is ready. */ + fprintf(f, + "After=graphical-session.target\n"); + + fprintf(f, + "\n[Service]\n" + "Type=exec\n" + "ExitType=cgroup\n" + "ExecStart=:%s\n" + "Restart=no\n" + "TimeoutStopSec=5s\n" + "Slice=app.slice\n", + exec_start); + + if (service->working_directory) { + _cleanup_free_ char *e_working_directory = NULL; + + e_working_directory = cescape(service->working_directory); + if (!e_working_directory) + return log_oom(); + + fprintf(f, "WorkingDirectory=-%s\n", e_working_directory); + } + + /* Generate an ExecCondition to check $XDG_CURRENT_DESKTOP */ + if (!strv_isempty(only_show_in) || !strv_isempty(not_show_in)) { + _cleanup_free_ char *only_show_in_string = NULL, *not_show_in_string = NULL, *e_only_show_in = NULL, *e_not_show_in = NULL; + + only_show_in_string = strv_join(only_show_in, ":"); + not_show_in_string = strv_join(not_show_in, ":"); + if (!only_show_in_string || !not_show_in_string) + return log_oom(); + + e_only_show_in = cescape(only_show_in_string); + e_not_show_in = cescape(not_show_in_string); + if (!e_only_show_in || !e_not_show_in) + return log_oom(); + + /* Just assume the values are reasonably sane */ + fprintf(f, + "ExecCondition=" LIBEXECDIR "/systemd-xdg-autostart-condition \"%s\" \"%s\"\n", + e_only_show_in, + e_not_show_in); + } + + r = xdg_autostart_generate_desktop_condition(service, f, + "gnome-systemd-autostart-condition", + service->autostart_condition); + if (r < 0) + return r; + + r = xdg_autostart_generate_desktop_condition(service, f, + "kde-systemd-start-condition", + service->kde_autostart_condition); + if (r < 0) + return r; + + r = fflush_and_check(f); + if (r < 0) + return log_error_errno(r, "Failed to write unit %s: %m", service->name); + + log_debug("%s: symlinking %s in xdg-desktop-autostart.target/.wants%s", + service->path, service->name, special_glyph(SPECIAL_GLYPH_ELLIPSIS)); + return generator_add_symlink(dest, "xdg-desktop-autostart.target", "wants", service->name); +} |