$ git clone -n https://src.fedoraproject.org/rpms/ghc-haskell-lexer.git /var/lib/mock/f41-build-837624-159296/root/chroot_tmpdir/scmroot/ghc-haskell-lexer
Cloning into '/var/lib/mock/f41-build-837624-159296/root/chroot_tmpdir/scmroot/ghc-haskell-lexer'...
$ git fetch origin ed0011020d21fd3ec3be069baa64b6addf2a3467:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-haskell-lexer
 * [new ref]         ed0011020d21fd3ec3be069baa64b6addf2a3467 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ed00110 bump release