$ git clone -n https://src.fedoraproject.org/rpms/perl-Test-Deep-JSON.git /var/lib/mock/f45-build-26616-618/root/chroot_tmpdir/scmroot/perl-Test-Deep-JSON
Cloning into '/var/lib/mock/f45-build-26616-618/root/chroot_tmpdir/scmroot/perl-Test-Deep-JSON'...
$ git fetch origin 1ba738260d3dbff6fb8c8c1b23d2b93d5755be32:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Test-Deep-JSON
 * [new ref]         1ba738260d3dbff6fb8c8c1b23d2b93d5755be32 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1ba7382 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild