$ git clone -n https://src.fedoraproject.org/rpms/xmlstreambuffer.git /var/lib/mock/f41-build-781153-13559/root/chroot_tmpdir/scmroot/xmlstreambuffer
Cloning into '/var/lib/mock/f41-build-781153-13559/root/chroot_tmpdir/scmroot/xmlstreambuffer'...
$ git fetch origin dde4b346ce4e49576aec5f542c4756600951e0d3:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/xmlstreambuffer
 * [new ref]         dde4b346ce4e49576aec5f542c4756600951e0d3 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at dde4b34 Rebuilt for java-21-openjdk as system jdk