$ git clone -n https://src.fedoraproject.org/rpms/ghc-tasty-rerun.git /var/lib/mock/f39-build-1962067-43270/root/chroot_tmpdir/scmroot/ghc-tasty-rerun
Cloning into '/var/lib/mock/f39-build-1962067-43270/root/chroot_tmpdir/scmroot/ghc-tasty-rerun'...
$ git fetch origin d59ef69b912d4645c0f74353048bebe5963d24b6:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-tasty-rerun
 * [new ref]         d59ef69b912d4645c0f74353048bebe5963d24b6 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d59ef69 revised .cabal file