1 files changed, 150 insertions, 0 deletions
diff --git a/src/core/load-dropin.c b/src/core/load-dropin.c
new file mode 100644
index 0000000000..86f81c7484
--- /dev/null
+++ b/src/core/load-dropin.c
@@ -0,0 +1,150 @@
+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+/***
+  This file is part of systemd.
+
+  Copyright 2010 Lennart Poettering
+
+  systemd is free software; you can redistribute it and/or modify it
+  under the terms of the GNU Lesser General Public License as published by
+  the Free Software Foundation; either version 2.1 of the License, or
+  (at your option) any later version.
+
+  systemd is distributed in the hope that it will be useful, but
+  WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+  Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public License
+  along with systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+#include <dirent.h>
+#include <errno.h>
+
+#include "unit.h"
+#include "load-dropin.h"
+#include "log.h"
+#include "strv.h"
+#include "unit-name.h"
+
+static int iterate_dir(Unit *u, const char *path, UnitDependency dependency) {
+        DIR *d;
+        struct dirent *de;
+        int r;
+
+        assert(u);
+        assert(path);
+
+        d = opendir(path);
+        if (!d) {
+
+                if (errno == ENOENT)
+                        return 0;
+
+                return -errno;
+        }
+
+        while ((de = readdir(d))) {
+                char *f;
+
+                if (ignore_file(de->d_name))
+                        continue;
+
+                f = strjoin(path, "/", de->d_name, NULL);
+                if (!f) {
+                        r = -ENOMEM;
+                        goto finish;
+                }
+
+                r = unit_add_dependency_by_name(u, dependency, de->d_name, f, true);
+                free(f);
+
+                if (r < 0)
+                        log_error("Cannot add dependency %s to %s, ignoring: %s", de->d_name, u->id, strerror(-r));
+        }
+
+        r = 0;
+
+finish:
+        closedir(d);
+        return r;
+}
+
+static int process_dir(Unit *u, const char *unit_path, const char *name, const char *suffix, UnitDependency dependency) {
+        int r;
+        char *path;
+
+        assert(u);
+        assert(unit_path);
+        assert(name);
+        assert(suffix);
+
+        path = strjoin(unit_path, "/", name, suffix, NULL);
+        if (!path)
+                return -ENOMEM;
+
+        if (u->manager->unit_path_cache &&
+            !set_get(u->manager->unit_path_cache, path))
+                r = 0;
+        else
+                r = iterate_dir(u, path, dependency);
+        free(path);
+
+        if (r < 0)
+                return r;
+
+        if (u->instance) {
+                char *template;
+                /* Also try the template dir */
+
+                template = unit_name_template(name);
+                if (!template)
+                        return -ENOMEM;
+
+                path = strjoin(unit_path, "/", template, suffix, NULL);
+                free(template);
+
+                if (!path)
+                        return -ENOMEM;
+
+                if (u->manager->unit_path_cache &&
+                    !set_get(u->manager->unit_path_cache, path))
+                        r = 0;
+                else
+                        r = iterate_dir(u, path, dependency);
+                free(path);
+
+                if (r < 0)
+                        return r;
+        }
+
+        return 0;
+}
+
+int unit_load_dropin(Unit *u) {
+        Iterator i;
+        char *t;
+
+        assert(u);
+
+        /* Load dependencies from supplementary drop-in directories */
+
+        SET_FOREACH(t, u->names, i) {
+                char **p;
+
+                STRV_FOREACH(p, u->manager->lookup_paths.unit_path) {
+                        int r;
+
+                        r = process_dir(u, *p, t, ".wants", UNIT_WANTS);
+                        if (r < 0)
+                                return r;
+
+                        r = process_dir(u, *p, t, ".requires", UNIT_REQUIRES);
+                        if (r < 0)
+                                return r;
+                }
+        }
+
+        return 0;
+}