$ git clone -n https://src.fedoraproject.org/rpms/rubygem-mini_magick.git /var/lib/mock/f45-build-35037-693/root/chroot_tmpdir/scmroot/rubygem-mini_magick
Cloning into '/var/lib/mock/f45-build-35037-693/root/chroot_tmpdir/scmroot/rubygem-mini_magick'...
$ git fetch origin 1d76d582b1b53f3016dbfb0ccd82daf51f94551b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rubygem-mini_magick
 * [new ref]         1d76d582b1b53f3016dbfb0ccd82daf51f94551b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1d76d58 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild