$ git clone -n https://src.fedoraproject.org/rpms/perl-String-TtyLength.git /var/lib/mock/f45-build-26424-617/root/chroot_tmpdir/scmroot/perl-String-TtyLength
Cloning into '/var/lib/mock/f45-build-26424-617/root/chroot_tmpdir/scmroot/perl-String-TtyLength'...
$ git fetch origin c7aabf8e33aec3b9360995007930d77c8ccddc80:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-String-TtyLength
 * [new ref]         c7aabf8e33aec3b9360995007930d77c8ccddc80 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c7aabf8 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild