$ git clone -n https://src.fedoraproject.org/rpms/perl-Package-Variant.git /var/lib/mock/f45-build-25616-612/root/chroot_tmpdir/scmroot/perl-Package-Variant
Cloning into '/var/lib/mock/f45-build-25616-612/root/chroot_tmpdir/scmroot/perl-Package-Variant'...
$ git fetch origin ec9e5f8d670d34dedeca38d56221c8d660fee5c7:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Package-Variant
 * [new ref]         ec9e5f8d670d34dedeca38d56221c8d660fee5c7 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ec9e5f8 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild