diff options
Diffstat (limited to '')
-rw-r--r-- | src/core/load-dropin.c | 142 |
1 files changed, 142 insertions, 0 deletions
diff --git a/src/core/load-dropin.c b/src/core/load-dropin.c new file mode 100644 index 0000000..a50b200 --- /dev/null +++ b/src/core/load-dropin.c @@ -0,0 +1,142 @@ +/* SPDX-License-Identifier: LGPL-2.1+ */ + +#include "conf-parser.h" +#include "fs-util.h" +#include "load-dropin.h" +#include "load-fragment.h" +#include "log.h" +#include "stat-util.h" +#include "string-util.h" +#include "strv.h" +#include "unit-name.h" +#include "unit.h" + +static int unit_name_compatible(const char *a, const char *b) { + _cleanup_free_ char *template = NULL; + int r; + + /* The straightforward case: the symlink name matches the target */ + if (streq(a, b)) + return 1; + + r = unit_name_template(a, &template); + if (r == -EINVAL) + return 0; /* Not a template */ + if (r < 0) + return r; /* OOM, or some other failure. Just skip the warning. */ + + /* An instance name points to a target that is just the template name */ + return streq(template, b); +} + +static int process_deps(Unit *u, UnitDependency dependency, const char *dir_suffix) { + _cleanup_strv_free_ char **paths = NULL; + char **p; + int r; + + r = unit_file_find_dropin_paths(NULL, + u->manager->lookup_paths.search_path, + u->manager->unit_path_cache, + dir_suffix, + NULL, + u->names, + &paths); + if (r < 0) + return r; + + STRV_FOREACH(p, paths) { + _cleanup_free_ char *target = NULL; + const char *entry; + + entry = basename(*p); + + if (null_or_empty_path(*p) > 0) { + /* an error usually means an invalid symlink, which is not a mask */ + log_unit_debug(u, "%s dependency on %s is masked by %s, ignoring.", + unit_dependency_to_string(dependency), entry, *p); + continue; + } + + r = is_symlink(*p); + if (r < 0) { + log_unit_warning_errno(u, r, "%s dropin %s unreadable, ignoring: %m", + unit_dependency_to_string(dependency), *p); + continue; + } + if (r == 0) { + log_unit_warning(u, "%s dependency dropin %s is not a symlink, ignoring.", + unit_dependency_to_string(dependency), *p); + continue; + } + + if (!unit_name_is_valid(entry, UNIT_NAME_ANY)) { + log_unit_warning(u, "%s dependency dropin %s is not a valid unit name, ignoring.", + unit_dependency_to_string(dependency), *p); + continue; + } + + r = readlink_malloc(*p, &target); + if (r < 0) { + log_unit_warning_errno(u, r, "readlink(\"%s\") failed, ignoring: %m", *p); + continue; + } + + /* We don't treat this as an error, especially because we didn't check this for a + * long time. Nevertheless, we warn, because such mismatch can be mighty confusing. */ + r = unit_name_compatible(entry, basename(target)); + if (r < 0) { + log_unit_warning_errno(u, r, "Can't check if names %s and %s are compatible, ignoring: %m", entry, basename(target)); + continue; + } + if (r == 0) + log_unit_warning(u, "%s dependency dropin %s target %s has different name", + unit_dependency_to_string(dependency), *p, target); + + r = unit_add_dependency_by_name(u, dependency, entry, true, UNIT_DEPENDENCY_FILE); + if (r < 0) + log_unit_warning_errno(u, r, "Cannot add %s dependency on %s, ignoring: %m", + unit_dependency_to_string(dependency), entry); + } + + return 0; +} + +int unit_load_dropin(Unit *u) { + _cleanup_strv_free_ char **l = NULL; + char **f; + int r; + + assert(u); + + /* Load dependencies from .wants and .requires directories */ + r = process_deps(u, UNIT_WANTS, ".wants"); + if (r < 0) + return r; + + r = process_deps(u, UNIT_REQUIRES, ".requires"); + if (r < 0) + return r; + + /* Load .conf dropins */ + r = unit_find_dropin_paths(u, &l); + if (r <= 0) + return 0; + + if (!u->dropin_paths) + u->dropin_paths = TAKE_PTR(l); + else { + r = strv_extend_strv(&u->dropin_paths, l, true); + if (r < 0) + return log_oom(); + } + + STRV_FOREACH(f, u->dropin_paths) + (void) config_parse(u->id, *f, NULL, + UNIT_VTABLE(u)->sections, + config_item_perf_lookup, load_fragment_gperf_lookup, + 0, u); + + u->dropin_mtime = now(CLOCK_REALTIME); + + return 0; +} |