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