$ git clone -n https://src.fedoraproject.org/rpms/mxml.git /var/lib/mock/f40-build-2012237-45778/root/chroot_tmpdir/scmroot/mxml
Cloning into '/var/lib/mock/f40-build-2012237-45778/root/chroot_tmpdir/scmroot/mxml'...
$ git fetch origin a8c90e5d1d240cde241ad8c52e87d87810db8537:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/mxml
 * [new ref]         a8c90e5d1d240cde241ad8c52e87d87810db8537 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a8c90e5 Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild