$ git clone -n https://src.fedoraproject.org/rpms/perl-JSON.git /var/lib/mock/f45-build-24280-603/root/chroot_tmpdir/scmroot/perl-JSON
Cloning into '/var/lib/mock/f45-build-24280-603/root/chroot_tmpdir/scmroot/perl-JSON'...
$ git fetch origin e3a0de8f891dd5135010eb99d310782ab832ca08:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-JSON
 * [new ref]         e3a0de8f891dd5135010eb99d310782ab832ca08 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e3a0de8 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild