$ git clone -n https://src.fedoraproject.org/rpms/rubygem-netrc.git /var/lib/mock/f45-build-35058-693/root/chroot_tmpdir/scmroot/rubygem-netrc
Cloning into '/var/lib/mock/f45-build-35058-693/root/chroot_tmpdir/scmroot/rubygem-netrc'...
$ git fetch origin 7e98a76c5c16b6090e936238ee06016efdb32c66:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rubygem-netrc
 * [new ref]         7e98a76c5c16b6090e936238ee06016efdb32c66 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7e98a76 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild