$ git clone -n https://src.fedoraproject.org/rpms/perl-JSON-MaybeXS.git /var/lib/mock/f45-build-24283-603/root/chroot_tmpdir/scmroot/perl-JSON-MaybeXS
Cloning into '/var/lib/mock/f45-build-24283-603/root/chroot_tmpdir/scmroot/perl-JSON-MaybeXS'...
$ git fetch origin f507b722f5d3cca1a8d66052a6a035638a4a2135:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-JSON-MaybeXS
 * [new ref]         f507b722f5d3cca1a8d66052a6a035638a4a2135 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f507b72 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild