$ git clone -n https://src.fedoraproject.org/rpms/ghc-isocline.git /var/lib/mock/f41-build-837634-159296/root/chroot_tmpdir/scmroot/ghc-isocline
Cloning into '/var/lib/mock/f41-build-837634-159296/root/chroot_tmpdir/scmroot/ghc-isocline'...
$ git fetch origin 3df15200455f6be49d3f4e5db87c5eea71296545:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-isocline
 * [new ref]         3df15200455f6be49d3f4e5db87c5eea71296545 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3df1520 bump release