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Diffstat (limited to 'src/core/path.c')
-rw-r--r--src/core/path.c258
1 files changed, 157 insertions, 101 deletions
diff --git a/src/core/path.c b/src/core/path.c
index 767620ba75..8a09deb4ff 100644
--- a/src/core/path.c
+++ b/src/core/path.c
@@ -31,8 +31,9 @@
#include "mkdir.h"
#include "dbus-path.h"
#include "special.h"
-#include "bus-errors.h"
+#include "dbus-common.h"
#include "path-util.h"
+#include "macro.h"
static const UnitActiveState state_translation_table[_PATH_STATE_MAX] = {
[PATH_DEAD] = UNIT_INACTIVE,
@@ -52,7 +53,7 @@ int path_spec_watch(PathSpec *s, Unit *u) {
};
bool exists = false;
- char *k, *slash;
+ char *slash, *oldslash = NULL;
int r;
assert(u);
@@ -60,47 +61,85 @@ int path_spec_watch(PathSpec *s, Unit *u) {
path_spec_unwatch(s, u);
- if (!(k = strdup(s->path)))
- return -ENOMEM;
-
- if ((s->inotify_fd = inotify_init1(IN_NONBLOCK|IN_CLOEXEC)) < 0) {
+ s->inotify_fd = inotify_init1(IN_NONBLOCK|IN_CLOEXEC);
+ if (s->inotify_fd < 0) {
r = -errno;
goto fail;
}
- if (unit_watch_fd(u, s->inotify_fd, EPOLLIN, &s->watch) < 0) {
- r = -errno;
+ r = unit_watch_fd(u, s->inotify_fd, EPOLLIN, &s->watch);
+ if (r < 0)
goto fail;
- }
- s->primary_wd = inotify_add_watch(s->inotify_fd, k, flags_table[s->type]);
- if (s->primary_wd >= 0)
- exists = true;
+ /* This assumes the path was passed through path_kill_slashes()! */
- do {
+ for (slash = strchr(s->path, '/'); ; slash = strchr(slash+1, '/')) {
+ char *cut = NULL;
int flags;
+ char tmp;
+
+ if (slash) {
+ cut = slash + (slash == s->path);
+ tmp = *cut;
+ *cut = '\0';
+
+ flags = IN_MOVE_SELF | IN_DELETE_SELF | IN_ATTRIB | IN_CREATE | IN_MOVED_TO;
+ } else
+ flags = flags_table[s->type];
+
+ r = inotify_add_watch(s->inotify_fd, s->path, flags);
+ if (r < 0) {
+ if (errno == EACCES || errno == ENOENT) {
+ if (cut)
+ *cut = tmp;
+ break;
+ }
+
+ log_warning("Failed to add watch on %s: %m", s->path);
+ r = -errno;
+ if (cut)
+ *cut = tmp;
+ goto fail;
+ } else {
+ exists = true;
- /* This assumes the path was passed through path_kill_slashes()! */
- slash = strrchr(k, '/');
- if (!slash)
- break;
+ /* Path exists, we don't need to watch parent
+ too closely. */
+ if (oldslash) {
+ char *cut2 = oldslash + (oldslash == s->path);
+ char tmp2 = *cut2;
+ *cut2 = '\0';
+
+ inotify_add_watch(s->inotify_fd, s->path, IN_MOVE_SELF);
+ /* Error is ignored, the worst can happen is
+ we get spurious events. */
- /* Trim the path at the last slash. Keep the slash if it's the root dir. */
- slash[slash == k] = 0;
+ *cut2 = tmp2;
+ }
+ }
- flags = IN_MOVE_SELF;
- if (!exists)
- flags |= IN_DELETE_SELF | IN_ATTRIB | IN_CREATE | IN_MOVED_TO;
+ if (cut)
+ *cut = tmp;
- if (inotify_add_watch(s->inotify_fd, k, flags) >= 0)
- exists = true;
- } while (slash != k);
+ if (slash)
+ oldslash = slash;
+ else {
+ /* whole path has been iterated over */
+ s->primary_wd = r;
+ break;
+ }
+ }
+
+ if (!exists) {
+ log_error("Failed to add watch on any of the components of %s: %m",
+ s->path);
+ r = -errno; /* either EACCESS or ENOENT */
+ goto fail;
+ }
return 0;
fail:
- free(k);
-
path_spec_unwatch(s, u);
return r;
}
@@ -117,7 +156,7 @@ void path_spec_unwatch(PathSpec *s, Unit *u) {
}
int path_spec_fd_event(PathSpec *s, uint32_t events) {
- uint8_t *buf = NULL;
+ _cleanup_free_ uint8_t *buf = NULL;
struct inotify_event *e;
ssize_t k;
int l;
@@ -125,30 +164,24 @@ int path_spec_fd_event(PathSpec *s, uint32_t events) {
if (events != EPOLLIN) {
log_error("Got invalid poll event on inotify.");
- r = -EINVAL;
- goto out;
+ return -EINVAL;
}
if (ioctl(s->inotify_fd, FIONREAD, &l) < 0) {
log_error("FIONREAD failed: %m");
- r = -errno;
- goto out;
+ return -errno;
}
assert(l > 0);
buf = malloc(l);
- if (!buf) {
- log_error("Failed to allocate buffer: %m");
- r = -errno;
- goto out;
- }
+ if (!buf)
+ return log_oom();
k = read(s->inotify_fd, buf, l);
if (k < 0) {
log_error("Failed to read inotify event: %m");
- r = -errno;
- goto out;
+ return -errno;
}
e = (struct inotify_event*) buf;
@@ -166,8 +199,7 @@ int path_spec_fd_event(PathSpec *s, uint32_t events) {
e = (struct inotify_event*) ((uint8_t*) e + step);
k -= step;
}
-out:
- free(buf);
+
return r;
}
@@ -248,22 +280,27 @@ static void path_init(Unit *u) {
p->directory_mode = 0755;
}
-static void path_done(Unit *u) {
- Path *p = PATH(u);
+void path_free_specs(Path *p) {
PathSpec *s;
assert(p);
- unit_ref_unset(&p->unit);
-
while ((s = p->specs)) {
- path_spec_unwatch(s, u);
+ path_spec_unwatch(s, UNIT(p));
LIST_REMOVE(PathSpec, spec, p->specs, s);
path_spec_done(s);
free(s);
}
}
+static void path_done(Unit *u) {
+ Path *p = PATH(u);
+
+ assert(p);
+
+ path_free_specs(p);
+}
+
int path_add_one_mount_link(Path *p, Mount *m) {
PathSpec *s;
int r;
@@ -276,11 +313,12 @@ int path_add_one_mount_link(Path *p, Mount *m) {
return 0;
LIST_FOREACH(spec, s, p->specs) {
-
if (!path_spec_startswith(s, m->where))
continue;
- if ((r = unit_add_two_dependencies(UNIT(p), UNIT_AFTER, UNIT_REQUIRES, UNIT(m), true)) < 0)
+ r = unit_add_two_dependencies(UNIT(p), UNIT_AFTER, UNIT_REQUIRES,
+ UNIT(m), true);
+ if (r < 0)
return r;
}
@@ -293,9 +331,11 @@ static int path_add_mount_links(Path *p) {
assert(p);
- LIST_FOREACH(units_by_type, other, UNIT(p)->manager->units_by_type[UNIT_MOUNT])
- if ((r = path_add_one_mount_link(p, MOUNT(other))) < 0)
+ LIST_FOREACH(units_by_type, other, UNIT(p)->manager->units_by_type[UNIT_MOUNT]) {
+ r = path_add_one_mount_link(p, MOUNT(other));
+ if (r < 0)
return r;
+ }
return 0;
}
@@ -320,15 +360,20 @@ static int path_add_default_dependencies(Path *p) {
assert(p);
- if (UNIT(p)->manager->running_as == SYSTEMD_SYSTEM) {
- if ((r = unit_add_dependency_by_name(UNIT(p), UNIT_BEFORE, SPECIAL_BASIC_TARGET, NULL, true)) < 0)
- return r;
+ r = unit_add_dependency_by_name(UNIT(p), UNIT_BEFORE,
+ SPECIAL_PATHS_TARGET, NULL, true);
+ if (r < 0)
+ return r;
- if ((r = unit_add_two_dependencies_by_name(UNIT(p), UNIT_AFTER, UNIT_REQUIRES, SPECIAL_SYSINIT_TARGET, NULL, true)) < 0)
+ if (UNIT(p)->manager->running_as == SYSTEMD_SYSTEM) {
+ r = unit_add_two_dependencies_by_name(UNIT(p), UNIT_AFTER, UNIT_REQUIRES,
+ SPECIAL_SYSINIT_TARGET, NULL, true);
+ if (r < 0)
return r;
}
- return unit_add_two_dependencies_by_name(UNIT(p), UNIT_BEFORE, UNIT_CONFLICTS, SPECIAL_SHUTDOWN_TARGET, NULL, true);
+ return unit_add_two_dependencies_by_name(UNIT(p), UNIT_BEFORE, UNIT_CONFLICTS,
+ SPECIAL_SHUTDOWN_TARGET, NULL, true);
}
static int path_load(Unit *u) {
@@ -338,31 +383,33 @@ static int path_load(Unit *u) {
assert(u);
assert(u->load_state == UNIT_STUB);
- if ((r = unit_load_fragment_and_dropin(u)) < 0)
+ r = unit_load_fragment_and_dropin(u);
+ if (r < 0)
return r;
if (u->load_state == UNIT_LOADED) {
- if (!UNIT_DEREF(p->unit)) {
+ if (set_isempty(u->dependencies[UNIT_TRIGGERS])) {
Unit *x;
r = unit_load_related_unit(u, ".service", &x);
if (r < 0)
return r;
- unit_ref_set(&p->unit, x);
+ r = unit_add_two_dependencies(u, UNIT_BEFORE, UNIT_TRIGGERS, x, true);
+ if (r < 0)
+ return r;
}
- r = unit_add_two_dependencies(u, UNIT_BEFORE, UNIT_TRIGGERS, UNIT_DEREF(p->unit), true);
+ r = path_add_mount_links(p);
if (r < 0)
return r;
- if ((r = path_add_mount_links(p)) < 0)
- return r;
-
- if (UNIT(p)->default_dependencies)
- if ((r = path_add_default_dependencies(p)) < 0)
+ if (UNIT(p)->default_dependencies) {
+ r = path_add_default_dependencies(p);
+ if (r < 0)
return r;
+ }
}
return path_verify(p);
@@ -370,11 +417,14 @@ static int path_load(Unit *u) {
static void path_dump(Unit *u, FILE *f, const char *prefix) {
Path *p = PATH(u);
+ Unit *trigger;
PathSpec *s;
assert(p);
assert(f);
+ trigger = UNIT_TRIGGER(u);
+
fprintf(f,
"%sPath State: %s\n"
"%sResult: %s\n"
@@ -383,7 +433,7 @@ static void path_dump(Unit *u, FILE *f, const char *prefix) {
"%sDirectoryMode: %04o\n",
prefix, path_state_to_string(p->state),
prefix, path_result_to_string(p->result),
- prefix, UNIT_DEREF(p->unit)->id,
+ prefix, trigger ? trigger->id : "n/a",
prefix, yes_no(p->make_directory),
prefix, p->directory_mode);
@@ -406,9 +456,11 @@ static int path_watch(Path *p) {
assert(p);
- LIST_FOREACH(spec, s, p->specs)
- if ((r = path_spec_watch(s, UNIT(p))) < 0)
+ LIST_FOREACH(spec, s, p->specs) {
+ r = path_spec_watch(s, UNIT(p));
+ if (r < 0)
return r;
+ }
return 0;
}
@@ -463,32 +515,35 @@ static void path_enter_dead(Path *p, PathResult f) {
}
static void path_enter_running(Path *p) {
+ _cleanup_dbus_error_free_ DBusError error;
int r;
- DBusError error;
assert(p);
+
dbus_error_init(&error);
/* Don't start job if we are supposed to go down */
- if (UNIT(p)->job && UNIT(p)->job->type == JOB_STOP)
+ if (unit_stop_pending(UNIT(p)))
return;
- if ((r = manager_add_job(UNIT(p)->manager, JOB_START, UNIT_DEREF(p->unit), JOB_REPLACE, true, &error, NULL)) < 0)
+ r = manager_add_job(UNIT(p)->manager, JOB_START, UNIT_TRIGGER(UNIT(p)),
+ JOB_REPLACE, true, &error, NULL);
+ if (r < 0)
goto fail;
p->inotify_triggered = false;
- if ((r = path_watch(p)) < 0)
+ r = path_watch(p);
+ if (r < 0)
goto fail;
path_set_state(p, PATH_RUNNING);
return;
fail:
- log_warning("%s failed to queue unit startup job: %s", UNIT(p)->id, bus_error(&error, r));
+ log_warning("%s failed to queue unit startup job: %s",
+ UNIT(p)->id, bus_error(&error, r));
path_enter_dead(p, PATH_FAILURE_RESOURCES);
-
- dbus_error_free(&error);
}
static bool path_check_good(Path *p, bool initial) {
@@ -517,7 +572,8 @@ static void path_enter_waiting(Path *p, bool initial, bool recheck) {
return;
}
- if ((r = path_watch(p)) < 0)
+ r = path_watch(p);
+ if (r < 0)
goto fail;
/* Hmm, so now we have created inotify watches, but the file
@@ -535,7 +591,8 @@ static void path_enter_waiting(Path *p, bool initial, bool recheck) {
return;
fail:
- log_warning("%s failed to enter waiting state: %s", UNIT(p)->id, strerror(-r));
+ log_warning("%s failed to enter waiting state: %s",
+ UNIT(p)->id, strerror(-r));
path_enter_dead(p, PATH_FAILURE_RESOURCES);
}
@@ -557,7 +614,7 @@ static int path_start(Unit *u) {
assert(p);
assert(p->state == PATH_DEAD || p->state == PATH_FAILED);
- if (UNIT_DEREF(p->unit)->load_state != UNIT_LOADED)
+ if (UNIT_TRIGGER(u)->load_state != UNIT_LOADED)
return -ENOENT;
path_mkdir(p);
@@ -602,7 +659,8 @@ static int path_deserialize_item(Unit *u, const char *key, const char *value, FD
if (streq(key, "state")) {
PathState state;
- if ((state = path_state_from_string(value)) < 0)
+ state = path_state_from_string(value);
+ if (state < 0)
log_debug("Failed to parse state value %s", value);
else
p->deserialized_state = state;
@@ -622,13 +680,13 @@ static int path_deserialize_item(Unit *u, const char *key, const char *value, FD
return 0;
}
-static UnitActiveState path_active_state(Unit *u) {
+_pure_ static UnitActiveState path_active_state(Unit *u) {
assert(u);
return state_translation_table[PATH(u)->state];
}
-static const char *path_sub_state_to_string(Unit *u) {
+_pure_ static const char *path_sub_state_to_string(Unit *u) {
assert(u);
return path_state_to_string(PATH(u)->state);
@@ -677,32 +735,28 @@ fail:
path_enter_dead(p, PATH_FAILURE_RESOURCES);
}
-void path_unit_notify(Unit *u, UnitActiveState new_state) {
- Iterator i;
- Unit *k;
-
- if (u->type == UNIT_PATH)
- return;
-
- SET_FOREACH(k, u->dependencies[UNIT_TRIGGERED_BY], i) {
- Path *p;
+static void path_trigger_notify(Unit *u, Unit *other) {
+ Path *p = PATH(u);
- if (k->type != UNIT_PATH)
- continue;
+ assert(u);
+ assert(other);
- if (k->load_state != UNIT_LOADED)
- continue;
+ /* Invoked whenever the unit we trigger changes state or gains
+ * or loses a job */
- p = PATH(k);
+ if (other->load_state != UNIT_LOADED)
+ return;
- if (p->state == PATH_RUNNING && new_state == UNIT_INACTIVE) {
- log_debug("%s got notified about unit deactivation.", UNIT(p)->id);
+ if (p->state == PATH_RUNNING &&
+ UNIT_IS_INACTIVE_OR_FAILED(unit_active_state(other))) {
+ log_debug_unit(UNIT(p)->id,
+ "%s got notified about unit deactivation.",
+ UNIT(p)->id);
- /* 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);
- }
+ /* 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);
}
}
@@ -769,6 +823,8 @@ const UnitVTable path_vtable = {
.fd_event = path_fd_event,
+ .trigger_notify = path_trigger_notify,
+
.reset_failed = path_reset_failed,
.bus_interface = "org.freedesktop.systemd1.Path",
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