$ git clone -n https://src.fedoraproject.org/rpms/perl-Test-Simple.git /var/lib/mock/f42-build-3161836-40897/root/chroot_tmpdir/scmroot/perl-Test-Simple
Cloning into '/var/lib/mock/f42-build-3161836-40897/root/chroot_tmpdir/scmroot/perl-Test-Simple'...
$ git fetch origin 9a8cf59bba89e0cbc584fc6fc6d67a09fb1a5171:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Test-Simple
 * [new ref]         9a8cf59bba89e0cbc584fc6fc6d67a09fb1a5171 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9a8cf59 Update to 1.302209