$ git clone -n https://src.fedoraproject.org/rpms/rust-libsystemd.git /var/lib/mock/f38-build-side-42-init-devel-1393995-31050/root/chroot_tmpdir/scmroot/rust-libsystemd
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-1393995-31050/root/chroot_tmpdir/scmroot/rust-libsystemd'...
$ git fetch origin ec6fabe6f64e7313dd69b2a6356ee43260f71a66:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-libsystemd
 * [new ref]         ec6fabe6f64e7313dd69b2a6356ee43260f71a66 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ec6fabe Update to version 0.5.0