$ git clone -n https://src.fedoraproject.org/rpms/bird.git /var/lib/mock/f38-build-side-42-init-devel-865555-28434/root/chroot_tmpdir/scmroot/bird
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-865555-28434/root/chroot_tmpdir/scmroot/bird'...
$ git fetch origin 9c581575a12546339356086ebad1fa81f59f3b28:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/bird
 * [new ref]         9c581575a12546339356086ebad1fa81f59f3b28 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9c58157 Upgrade to 2.0.12 (#2163423)