$ git clone -n https://src.fedoraproject.org/rpms/rubygem-rspec-support.git /var/lib/mock/f45-build-35265-694/root/chroot_tmpdir/scmroot/rubygem-rspec-support
Cloning into '/var/lib/mock/f45-build-35265-694/root/chroot_tmpdir/scmroot/rubygem-rspec-support'...
$ git fetch origin f1b02c4e277b9d7a491f35929a35e9443751a706:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rubygem-rspec-support
 * [new ref]         f1b02c4e277b9d7a491f35929a35e9443751a706 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f1b02c4 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild