$ git clone -n https://src.fedoraproject.org/rpms/ghc-aeson-better-errors.git /var/lib/mock/f39-build-1713326-41228/root/chroot_tmpdir/scmroot/ghc-aeson-better-errors
Cloning into '/var/lib/mock/f39-build-1713326-41228/root/chroot_tmpdir/scmroot/ghc-aeson-better-errors'...
$ git fetch origin fbc8ef0a356da9c4b4bbf7e0f906016643397bee:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-aeson-better-errors
 * [new ref]         fbc8ef0a356da9c4b4bbf7e0f906016643397bee -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at fbc8ef0 bump aeson bound