$ git clone -n https://src.fedoraproject.org/rpms/ghc-cmark.git /var/lib/mock/f40-build-2047854-48976/root/chroot_tmpdir/scmroot/ghc-cmark
Cloning into '/var/lib/mock/f40-build-2047854-48976/root/chroot_tmpdir/scmroot/ghc-cmark'...
$ git fetch origin e12f55056a068058916bcdb7e530aa730bbb4edb:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-cmark
 * [new ref]         e12f55056a068058916bcdb7e530aa730bbb4edb -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e12f550 https://hackage.haskell.org/package/cmark-0.6.1/changelog