machine-id: add --root option to operate on an alternate fs tree

This makes it possible to initialize the /etc/machine-id file on an
arbitrary filesystem hierarchy.  This helps systems that wish to run
this at image creation time in a subdirectory, or from initramfs before
pivot-root is called.

[tomegun: converted to using _cleanup_free_ macros]

1 files changed, 1 insertions, 1 deletions

diff --git a/src/core/main.c b/src/core/main.c
index f1b06d8880..cc876efa9c 100644
--- a/src/core/main.c
+++ b/src/core/main.c
@@ -1582,7 +1582,7 @@ int main(int argc, char *argv[]) {
                         kmod_setup();
 #endif
                 hostname_setup();
-                machine_id_setup();
+                machine_id_setup("");
                 loopback_setup();
 
                 test_mtab();