$ git clone -n https://src.fedoraproject.org/rpms/perl-Config-Std.git /var/lib/mock/f45-build-22563-593/root/chroot_tmpdir/scmroot/perl-Config-Std
Cloning into '/var/lib/mock/f45-build-22563-593/root/chroot_tmpdir/scmroot/perl-Config-Std'...
$ git fetch origin c99cef816111f6f26c06110c19dc1cb0f96eb1b4:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Config-Std
 * [new ref]         c99cef816111f6f26c06110c19dc1cb0f96eb1b4 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c99cef8 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild