$ git clone -n https://src.fedoraproject.org/rpms/xmlstreambuffer.git /var/lib/mock/f42-build-3354879-45022/root/chroot_tmpdir/scmroot/xmlstreambuffer
Cloning into '/var/lib/mock/f42-build-3354879-45022/root/chroot_tmpdir/scmroot/xmlstreambuffer'...
$ git fetch origin b1720565fa0fad97ea196cf9020547fa3f0a4d51:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/xmlstreambuffer
 * [new ref]         b1720565fa0fad97ea196cf9020547fa3f0a4d51 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b172056 Rebuilt for https://fedoraproject.org/wiki/Fedora_42_Mass_Rebuild