$ git clone -n https://src.fedoraproject.org/rpms/imagefactory.git /var/lib/mock/f39-build-1624930-39114/root/chroot_tmpdir/scmroot/imagefactory
Cloning into '/var/lib/mock/f39-build-1624930-39114/root/chroot_tmpdir/scmroot/imagefactory'...
$ git fetch origin 28c6a561b78dacdc6dc9e00240ea4aa7043e4b52:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/imagefactory
 * [new ref]         28c6a561b78dacdc6dc9e00240ea4aa7043e4b52 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 28c6a56 Preserve hard links when building Docker images