$ git clone -n https://src.fedoraproject.org/rpms/xalan-j2.git /var/lib/mock/f39-build-1542344-36517/root/chroot_tmpdir/scmroot/xalan-j2
Cloning into '/var/lib/mock/f39-build-1542344-36517/root/chroot_tmpdir/scmroot/xalan-j2'...
$ git fetch origin fca3ba1d6685d600797bb6ac787628a6bee4b2a0:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/xalan-j2
 * [new ref]         fca3ba1d6685d600797bb6ac787628a6bee4b2a0 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at fca3ba1 Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild