$ git clone -n https://src.fedoraproject.org/rpms/t-digest.git /var/lib/mock/f39-build-1786600-41718/root/chroot_tmpdir/scmroot/t-digest
Cloning into '/var/lib/mock/f39-build-1786600-41718/root/chroot_tmpdir/scmroot/t-digest'...
$ git fetch origin b984d0a24875630b11f75e2a47ba03d41cf51fcb:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/t-digest
 * [new ref]         b984d0a24875630b11f75e2a47ba03d41cf51fcb -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b984d0a Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild