$ git clone -n https://src.fedoraproject.org/rpms/rust-git-absorb.git /var/lib/mock/f40-build-2643442-66488/root/chroot_tmpdir/scmroot/rust-git-absorb
Cloning into '/var/lib/mock/f40-build-2643442-66488/root/chroot_tmpdir/scmroot/rust-git-absorb'...
$ git fetch origin ea897219155529f2a463985fdf533456c122a430:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-git-absorb
 * [new ref]         ea897219155529f2a463985fdf533456c122a430 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ea89721 Update to version 0.6.12; Fixes RHBZ#2265763