bootctl: create loader.conf only if it doesn't exist yet

If the snippet aleady exists, don't do anything, as the file was already
installed then.

(This also reworks the code to create the file atomically)

Fixes: #5396

1 files changed, 6 insertions, 0 deletions

diff --git a/src/basic/fs-util.h b/src/basic/fs-util.h
index 3f47537de..60f465a4d 100644
--- a/src/basic/fs-util.h
+++ b/src/basic/fs-util.h
@@ -104,3 +104,9 @@ static inline void rmdir_and_free(char *p) {
         free(p);
 }
 DEFINE_TRIVIAL_CLEANUP_FUNC(char*, rmdir_and_free);
+
+static inline void unlink_and_free(char *p) {
+        (void) unlink(p);
+        free(p);
+}
+DEFINE_TRIVIAL_CLEANUP_FUNC(char*, unlink_and_free);