$ git clone -n https://src.fedoraproject.org/rpms/perl-Email-Send.git /var/lib/mock/f39-build-1435794-32017/root/chroot_tmpdir/scmroot/perl-Email-Send
Cloning into '/var/lib/mock/f39-build-1435794-32017/root/chroot_tmpdir/scmroot/perl-Email-Send'...
$ git fetch origin b4f50f0c552cc177d62e8ed31ae24f865be9bf58:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Email-Send
 * [new ref]         b4f50f0c552cc177d62e8ed31ae24f865be9bf58 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b4f50f0 Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild