$ git clone -n https://src.fedoraproject.org/rpms/perl-JSON-WebToken.git /var/lib/mock/f45-build-24328-603/root/chroot_tmpdir/scmroot/perl-JSON-WebToken
Cloning into '/var/lib/mock/f45-build-24328-603/root/chroot_tmpdir/scmroot/perl-JSON-WebToken'...
$ git fetch origin f880e60d497c0e9cd93ed820e97fe0b3680a8536:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-JSON-WebToken
 * [new ref]         f880e60d497c0e9cd93ed820e97fe0b3680a8536 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f880e60 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild