$ git clone -n https://src.fedoraproject.org/rpms/perl-Tk-Stderr.git /var/lib/mock/f45-build-27143-621/root/chroot_tmpdir/scmroot/perl-Tk-Stderr
Cloning into '/var/lib/mock/f45-build-27143-621/root/chroot_tmpdir/scmroot/perl-Tk-Stderr'...
$ git fetch origin 03c474ca0bd69267c494ddfd03739aa17c5bc89c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Tk-Stderr
 * [new ref]         03c474ca0bd69267c494ddfd03739aa17c5bc89c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 03c474c Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild