$ git clone -n https://src.fedoraproject.org/rpms/perl-Module-Signature.git /var/lib/mock/f45-build-24911-607/root/chroot_tmpdir/scmroot/perl-Module-Signature
Cloning into '/var/lib/mock/f45-build-24911-607/root/chroot_tmpdir/scmroot/perl-Module-Signature'...
$ git fetch origin 8d9606be8c35ff90cd2cd4c45e394d43d51dd539:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Module-Signature
 * [new ref]         8d9606be8c35ff90cd2cd4c45e394d43d51dd539 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8d9606b Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild