$ git clone -n https://src.fedoraproject.org/rpms/perl-Test-Roo.git /var/lib/mock/f39-build-1435789-32017/root/chroot_tmpdir/scmroot/perl-Test-Roo
Cloning into '/var/lib/mock/f39-build-1435789-32017/root/chroot_tmpdir/scmroot/perl-Test-Roo'...
$ git fetch origin 493a026317dcfe2470b18152b844132527f2b4c2:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Test-Roo
 * [new ref]         493a026317dcfe2470b18152b844132527f2b4c2 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 493a026 Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild