$ git clone -n https://src.fedoraproject.org/rpms/perl-Tk-TableMatrix.git /var/lib/mock/f45-build-27250-622/root/chroot_tmpdir/scmroot/perl-Tk-TableMatrix
Cloning into '/var/lib/mock/f45-build-27250-622/root/chroot_tmpdir/scmroot/perl-Tk-TableMatrix'...
$ git fetch origin 426bc34716d857709b64f28aa6c00eb83e2f64bb:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Tk-TableMatrix
 * [new ref]         426bc34716d857709b64f28aa6c00eb83e2f64bb -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 426bc34 Perl 5.44 rebuild