$ git clone -n https://src.fedoraproject.org/rpms/callgit.git /var/lib/mock/f40-build-752638-116814/root/chroot_tmpdir/scmroot/callgit
Cloning into '/var/lib/mock/f40-build-752638-116814/root/chroot_tmpdir/scmroot/callgit'...
$ git fetch origin babacb71569bc0b27ddb69240d6b3382b006c69d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/callgit
 * [new ref]         babacb71569bc0b27ddb69240d6b3382b006c69d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at babacb7 Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild