$ git clone -n https://src.fedoraproject.org/rpms/perl-Module-Signature.git /var/lib/mock/f40-build-2229550-53161/root/chroot_tmpdir/scmroot/perl-Module-Signature
Cloning into '/var/lib/mock/f40-build-2229550-53161/root/chroot_tmpdir/scmroot/perl-Module-Signature'...
$ git fetch origin 5aee72716bce163ecee77782b3a1e10ac010ed10:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Module-Signature
 * [new ref]         5aee72716bce163ecee77782b3a1e10ac010ed10 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5aee727 Re-word changelog entry