$ git clone -n https://src.fedoraproject.org/rpms/exercism.git /var/lib/mock/f42-build-866267-173809/root/chroot_tmpdir/scmroot/exercism
Cloning into '/var/lib/mock/f42-build-866267-173809/root/chroot_tmpdir/scmroot/exercism'...
$ git fetch origin 6785a2c8e950abf491572c3a8d24c7decc6b1878:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/exercism
 * [new ref]         6785a2c8e950abf491572c3a8d24c7decc6b1878 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6785a2c Update to 3.5.4 upstream release