$ git clone -n https://src.fedoraproject.org/rpms/xchm.git /var/lib/mock/f42-build-3426827-45197/root/chroot_tmpdir/scmroot/xchm
Cloning into '/var/lib/mock/f42-build-3426827-45197/root/chroot_tmpdir/scmroot/xchm'...
$ git fetch origin b487d6223b05709f0e89f9dc4fe788784a739abf:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/xchm
 * [new ref]         b487d6223b05709f0e89f9dc4fe788784a739abf -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b487d62 Rebuilt for https://fedoraproject.org/wiki/Fedora_42_Mass_Rebuild