path: optionally, create watched directories in .path units

[elogind.git] / src / path.c

diff --git a/src/path.c b/src/path.c
index 0d594197779f40366bb2dcc31035a313a346a669..1a3e28f89f33fc962f271a29c63bfb509e977546 100644 (file)
--- a/src/path.c
+++ b/src/path.c
@@ -39,6 +39,15 @@ static const UnitActiveState state_translation_table[_PATH_STATE_MAX] = {
         [PATH_FAILED] = UNIT_FAILED
 };
 
+static void path_init(Unit *u) {
+        Path *p = PATH(u);
+
+        assert(u);
+        assert(u->meta.load_state == UNIT_STUB);
+
+        p->directory_mode = 0755;
+}
+
 static void path_unwatch_one(Path *p, PathSpec *s) {
 
         if (s->inotify_fd < 0)
@@ -169,9 +178,13 @@ static void path_dump(Unit *u, FILE *f, const char *prefix) {
 
         fprintf(f,
                 "%sPath State: %s\n"
-                "%sUnit: %s\n",
+                "%sUnit: %s\n"
+                "%sMakeDirectory: %s\n"
+                "%sDirectoryMode: %04o\n",
                 prefix, path_state_to_string(p->state),
-                prefix, p->unit->meta.id);
+                prefix, p->unit->meta.id,
+                prefix, yes_no(p->make_directory),
+                prefix, p->directory_mode);
 
         LIST_FOREACH(spec, s, p->specs)
                 fprintf(f,
@@ -189,7 +202,7 @@ static int path_watch_one(Path *p, PathSpec *s) {
         };
 
         bool exists = false;
-        char *k;
+        char *k, *slash;
         int r;
 
         assert(p);
@@ -213,23 +226,23 @@ static int path_watch_one(Path *p, PathSpec *s) {
         if ((s->primary_wd = inotify_add_watch(s->inotify_fd, k, flags_table[s->type])) >= 0)
                 exists = true;
 
-        for (;;) {
+        do {
                 int flags;
-                char *slash;
 
                 /* This assumes the path was passed through path_kill_slashes()! */
                 if (!(slash = strrchr(k, '/')))
                         break;
 
-                *slash = 0;
+                /* Trim the path at the last slash. Keep the slash if it's the root dir. */
+                slash[slash == k] = 0;
 
-                flags = IN_DELETE_SELF|IN_MOVE_SELF|IN_ATTRIB;
+                flags = IN_MOVE_SELF;
                 if (!exists)
-                        flags |= IN_CREATE | IN_MOVED_TO;
+                        flags |= IN_DELETE_SELF | IN_ATTRIB | IN_CREATE | IN_MOVED_TO;
 
                 if (inotify_add_watch(s->inotify_fd, k, flags) >= 0)
                         exists = true;
-        }
+        } while (slash != k);
 
         return 0;
 
@@ -279,10 +292,10 @@ static void path_set_state(Path *p, PathState state) {
                           path_state_to_string(old_state),
                           path_state_to_string(state));
 
-        unit_notify(UNIT(p), state_translation_table[old_state], state_translation_table[state]);
+        unit_notify(UNIT(p), state_translation_table[old_state], state_translation_table[state], true);
 }
 
-static void path_enter_waiting(Path *p, bool initial, bool recheck);
+static void path_enter_waiting(Path *p, bool initial, bool recheck, bool skip_watch);
 
 static int path_coldplug(Unit *u) {
         Path *p = PATH(u);
@@ -294,7 +307,7 @@ static int path_coldplug(Unit *u) {
 
                 if (p->deserialized_state == PATH_WAITING ||
                     p->deserialized_state == PATH_RUNNING)
-                        path_enter_waiting(p, true, true);
+                        path_enter_waiting(p, true, true, false);
                 else
                         path_set_state(p, p->deserialized_state);
         }
@@ -341,7 +354,7 @@ fail:
 }
 
 
-static void path_enter_waiting(Path *p, bool initial, bool recheck) {
+static void path_enter_waiting(Path *p, bool initial, bool recheck, bool skip_watch) {
         PathSpec *s;
         int r;
         bool good = false;
@@ -389,8 +402,16 @@ static void path_enter_waiting(Path *p, bool initial, bool recheck) {
         }
 
 waiting:
-        if ((r = path_watch(p)) < 0)
-                goto fail;
+        if (!skip_watch) {
+                if ((r = path_watch(p)) < 0)
+                        goto fail;
+
+                /* Hmm, so now we have created inotify watches, but the file
+                 * might have appeared/been removed by now, so we must
+                 * recheck */
+                path_enter_waiting(p, false, true, true);
+                return;
+        }
 
         path_set_state(p, PATH_WAITING);
         return;
@@ -400,6 +421,25 @@ fail:
         path_enter_dead(p, false);
 }
 
+static void path_mkdir(Path *p) {
+        PathSpec *s;
+
+        assert(p);
+
+        if (!p->make_directory)
+                return;
+
+        LIST_FOREACH(spec, s, p->specs) {
+                int r;
+
+                if (s->type == PATH_EXISTS)
+                        continue;
+
+                if ((r = mkdir_p(s->path, p->directory_mode)) < 0)
+                        log_warning("mkdir(%s) failed: %s", s->path, strerror(-r));
+        }
+}
+
 static int path_start(Unit *u) {
         Path *p = PATH(u);
 
@@ -409,8 +449,10 @@ static int path_start(Unit *u) {
         if (p->unit->meta.load_state != UNIT_LOADED)
                 return -ENOENT;
 
+        path_mkdir(p);
+
         p->failure = false;
-        path_enter_waiting(p, true, true);
+        path_enter_waiting(p, true, true, false);
 
         return 0;
 }
@@ -541,7 +583,7 @@ static void path_fd_event(Unit *u, int fd, uint32_t events, Watch *w) {
         if (changed)
                 path_enter_running(p);
         else
-                path_enter_waiting(p, false, true);
+                path_enter_waiting(p, false, true, false);
 
         free(buf);
 
@@ -590,7 +632,7 @@ void path_unit_notify(Unit *u, UnitActiveState new_state) {
                         /* Hmm, so inotify was triggered since the
                          * last activation, so I guess we need to
                          * recheck what is going on. */
-                        path_enter_waiting(p, false, p->inotify_triggered);
+                        path_enter_waiting(p, false, p->inotify_triggered, false);
                 }
         }
 
@@ -631,6 +673,7 @@ DEFINE_STRING_TABLE_LOOKUP(path_type, PathType);
 const UnitVTable path_vtable = {
         .suffix = ".path",
 
+        .init = path_init,
         .done = path_done,
         .load = path_load,