$ git clone -n https://src.fedoraproject.org/rpms/grep.git /var/lib/mock/f39-build-1530714-36198/root/chroot_tmpdir/scmroot/grep
Cloning into '/var/lib/mock/f39-build-1530714-36198/root/chroot_tmpdir/scmroot/grep'...
$ git fetch origin 0499c5d10b38b2400a5b9b5709c51bfc872bd979:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/grep
 * [new ref]         0499c5d10b38b2400a5b9b5709c51bfc872bd979 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 0499c5d Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild