$ git clone -n https://git.cclinux.org/stage/rpms/boom-boot.git /var/lib/mock/dist-circle9-build-121191-86036/root/chroot_tmpdir/scmroot/boom-boot
Cloning into '/var/lib/mock/dist-circle9-build-121191-86036/root/chroot_tmpdir/scmroot/boom-boot'...
$ git fetch origin 823d5ab9dda1bbe0a9bc5b7717f5ad2ae8d4a6e4:KOJI_FETCH_HEAD
From https://git.cclinux.org/stage/rpms/boom-boot
 * [new ref]         823d5ab9dda1bbe0a9bc5b7717f5ad2ae8d4a6e4 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 823d5ab import boom-boot-1.6.0-2.el9