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-rw-r--r--src/core/load-dropin.c142
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;
+}