$ git clone -n https://src.fedoraproject.org/rpms/rubygem-pango.git /var/lib/mock/f41-build-side-1-2892595-34595/root/chroot_tmpdir/scmroot/rubygem-pango
Cloning into '/var/lib/mock/f41-build-side-1-2892595-34595/root/chroot_tmpdir/scmroot/rubygem-pango'...
$ git fetch origin 013e442fe60bcc63c550b4a34aa0bb50a7f58642:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rubygem-pango
 * [new ref]         013e442fe60bcc63c550b4a34aa0bb50a7f58642 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 013e442 4.2.4 entry