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authorLennart Poettering <lennart@poettering.net>2014-06-13 12:52:31 +0200
committerLennart Poettering <lennart@poettering.net>2014-06-13 13:26:32 +0200
commita55654d598c78f8e084aa6a18fec6eff900c9aed (patch)
tree12e119c56dae72ebdb9c62b74fb21163330ee5d9 /src/core/condition.c
parent8ea48dfcd33e8db0c01bf8c57c3bbcfdc3c86d4b (diff)
core: add new ConditionNeedsUpdate= unit condition
This new condition allows checking whether /etc or /var are out-of-date relative to /usr. This is the counterpart for the update flag managed by systemd-update-done.service. Services that want to be started once after /usr got updated should use: [Unit] ConditionNeedsUpdate=/etc Before=systemd-update-done.service This makes sure that they are only run if /etc is out-of-date relative to /usr. And that it will be executed after systemd-update-done.service which is responsible for marking /etc up-to-date relative to the current /usr. ConditionNeedsUpdate= will also checks whether /etc is actually writable, and not trigger if it isn't, since no update is possible then.
Diffstat (limited to 'src/core/condition.c')
-rw-r--r--src/core/condition.c33
1 files changed, 33 insertions, 0 deletions
diff --git a/src/core/condition.c b/src/core/condition.c
index 833bcdf302..410fb36797 100644
--- a/src/core/condition.c
+++ b/src/core/condition.c
@@ -90,6 +90,36 @@ static bool condition_test_capability(Condition *c) {
return !!(capabilities & (1ULL << value)) == !c->negate;
}
+static bool condition_test_needs_update(Condition *c) {
+ const char *p;
+ struct stat usr, other;
+
+ assert(c);
+ assert(c->parameter);
+ assert(c->type == CONDITION_NEEDS_UPDATE);
+
+ /* If the file system is read-only we shouldn't suggest an update */
+ if (path_is_read_only_fs(c->parameter) > 0)
+ return c->negate;
+
+ /* Any other failure means we should allow the condition to be true,
+ * so that we rather invoke too many update tools then too
+ * few. */
+
+ if (!path_is_absolute(c->parameter))
+ return !c->negate;
+
+ p = strappenda(c->parameter, "/.updated");
+ if (lstat(p, &other) < 0)
+ return !c->negate;
+
+ if (lstat("/usr/", &usr) < 0)
+ return !c->negate;
+
+ return (usr.st_mtim.tv_sec > other.st_mtim.tv_sec ||
+ (usr.st_mtim.tv_sec == other.st_mtim.tv_sec && usr.st_mtim.tv_nsec > other.st_mtim.tv_nsec)) == !c->negate;
+}
+
static bool condition_test(Condition *c) {
assert(c);
@@ -169,6 +199,9 @@ static bool condition_test(Condition *c) {
case CONDITION_ARCHITECTURE:
return condition_test_architecture(c);
+ case CONDITION_NEEDS_UPDATE:
+ return condition_test_needs_update(c);
+
case CONDITION_NULL:
return !c->negate;