$ git clone -n https://src.fedoraproject.org/rpms/ghc-hxt.git /var/lib/mock/f41-build-side-1-2908508-34741/root/chroot_tmpdir/scmroot/ghc-hxt
Cloning into '/var/lib/mock/f41-build-side-1-2908508-34741/root/chroot_tmpdir/scmroot/ghc-hxt'...
$ git fetch origin ed13c2d7ba496844ffa740eabde18727e3647f73:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-hxt
 * [new ref]         ed13c2d7ba496844ffa740eabde18727e3647f73 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ed13c2d bump release