$ git clone -n https://src.fedoraproject.org/rpms/openjpeg2.git /var/lib/mock/f40-build-797421-141347/root/chroot_tmpdir/scmroot/openjpeg2
Cloning into '/var/lib/mock/f40-build-797421-141347/root/chroot_tmpdir/scmroot/openjpeg2'...
$ git fetch origin 1b807dffd228af229586e708f844c556b54759af:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/openjpeg2
 * [new ref]         1b807dffd228af229586e708f844c556b54759af -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1b807df Update to 2.5.2