$ git clone -n https://src.fedoraproject.org/rpms/ghc-OpenGLRaw.git /var/lib/mock/f40-build-2055505-49119/root/chroot_tmpdir/scmroot/ghc-OpenGLRaw
Cloning into '/var/lib/mock/f40-build-2055505-49119/root/chroot_tmpdir/scmroot/ghc-OpenGLRaw'...
$ git fetch origin 096261921e3e8e92237bcfaaf77d3221e0ba3217:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-OpenGLRaw
 * [new ref]         096261921e3e8e92237bcfaaf77d3221e0ba3217 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 0962619 cabal revision