$ git clone -n https://src.fedoraproject.org/rpms/xmlstreambuffer.git /var/lib/mock/f40-build-2544774-61898/root/chroot_tmpdir/scmroot/xmlstreambuffer
Cloning into '/var/lib/mock/f40-build-2544774-61898/root/chroot_tmpdir/scmroot/xmlstreambuffer'...
$ git fetch origin 446a11a6da82b2b4cb1142692d2e4d4d36b60742:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/xmlstreambuffer
 * [new ref]         446a11a6da82b2b4cb1142692d2e4d4d36b60742 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 446a11a Rebuilt for java-21-openjdk as system jdk