sd-id128: id128_write overwrites target file

diff --git a/src/libsystemd/sd-id128/id128-util.c b/src/libsystemd/sd-id128/id128-util.c
index 337eae2..e6d45c1 100644 (file)
--- a/src/libsystemd/sd-id128/id128-util.c
+++ b/src/libsystemd/sd-id128/id128-util.c
@@ -186,7 +186,7 @@ int id128_write_fd(int fd, Id128Format f, sd_id128_t id, bool do_sync) {
 int id128_write(const char *p, Id128Format f, sd_id128_t id, bool do_sync) {
         _cleanup_close_ int fd = -1;
 
-        fd = open(p, O_WRONLY|O_CREAT|O_CLOEXEC|O_NOCTTY, 0444);
+        fd = open(p, O_WRONLY|O_CREAT|O_CLOEXEC|O_NOCTTY|O_TRUNC, 0444);
         if (fd < 0)
                 return -errno;
 

diff --git a/test/TEST-14-MACHINE-ID/test.sh b/test/TEST-14-MACHINE-ID/test.sh
index 201d528..f7a39dd 100755 (executable)
--- a/test/TEST-14-MACHINE-ID/test.sh
+++ b/test/TEST-14-MACHINE-ID/test.sh
@@ -83,7 +83,8 @@ check expected "$r/etc/machine-id"
 
 r="$(pwd)/transient-machine-id"
 setup_root "$r"
-touch "$r/etc/machine-id"
+systemd-machine-id-setup --print --root "$r"
+echo abc >>"$r/etc/machine-id"
 mount -o remount,ro "$r"
 mount -t tmpfs tmpfs "$r/run"
 transient_id=$(systemd-machine-id-setup --print --root "$r")