$ git clone -n https://src.fedoraproject.org/rpms/ghc-base16-bytestring.git /var/lib/mock/f38-build-side-42-init-devel-856367-28426/root/chroot_tmpdir/scmroot/ghc-base16-bytestring
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-856367-28426/root/chroot_tmpdir/scmroot/ghc-base16-bytestring'...
$ git fetch origin b34e4978d8a7965ad9712b4f2faa2e2e457202c6:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-base16-bytestring
 * [new ref]         b34e4978d8a7965ad9712b4f2faa2e2e457202c6 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b34e497 Convert to %autorelease and %autochangelog