$ git clone -n https://src.fedoraproject.org/rpms/ghc-stringbuilder.git /var/lib/mock/f41-build-839342-160118/root/chroot_tmpdir/scmroot/ghc-stringbuilder
Cloning into '/var/lib/mock/f41-build-839342-160118/root/chroot_tmpdir/scmroot/ghc-stringbuilder'...
$ git fetch origin 92989c26d970ba478dd860caa9ad475f3fdd6271:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-stringbuilder
 * [new ref]         92989c26d970ba478dd860caa9ad475f3fdd6271 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 92989c2 bump release