$ git clone -n https://src.fedoraproject.org/rpms/xapian-core.git /var/lib/mock/f40-build-786721-134501/root/chroot_tmpdir/scmroot/xapian-core
Cloning into '/var/lib/mock/f40-build-786721-134501/root/chroot_tmpdir/scmroot/xapian-core'...
$ git fetch origin 1b58952167606506f3ab36ab27345bca60d3dbf5:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/xapian-core
 * [new ref]         1b58952167606506f3ab36ab27345bca60d3dbf5 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1b58952 Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild