$ git clone -n https://src.fedoraproject.org/rpms/crash.git /var/lib/mock/f40-build-2609495-63805/root/chroot_tmpdir/scmroot/crash
Cloning into '/var/lib/mock/f40-build-2609495-63805/root/chroot_tmpdir/scmroot/crash'...
$ git fetch origin d39bc3d4b585e13845e4175277de9d380e95c889:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/crash
 * [new ref]         d39bc3d4b585e13845e4175277de9d380e95c889 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d39bc3d Update to the latest commit <5977936c0a91>