$ git clone -n https://src.fedoraproject.org/rpms/crash.git /var/lib/mock/f39-build-1642979-40223/root/chroot_tmpdir/scmroot/crash
Cloning into '/var/lib/mock/f39-build-1642979-40223/root/chroot_tmpdir/scmroot/crash'...
$ git fetch origin d44b121714501679cd8439fc91602757e72779b6:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/crash
 * [new ref]         d44b121714501679cd8439fc91602757e72779b6 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d44b121 Update to the latest commit <c74f375e0ef7>