$ git clone -n https://src.fedoraproject.org/rpms/idris2.git /var/lib/mock/f41-build-60912135-6585567/root/chroot_tmpdir/scmroot/idris2
Cloning into '/var/lib/mock/f41-build-60912135-6585567/root/chroot_tmpdir/scmroot/idris2'...
$ git fetch origin 26a5f866b247608a1f7673824b43ce023f368c1e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/idris2
 * [new ref]         26a5f866b247608a1f7673824b43ce023f368c1e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 26a5f86 obsolete idris2-lib