$ git clone -n https://src.fedoraproject.org/rpms/ghc-uri-bytestring.git /var/lib/mock/f38-build-side-42-init-devel-1045097-29761/root/chroot_tmpdir/scmroot/ghc-uri-bytestring
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-1045097-29761/root/chroot_tmpdir/scmroot/ghc-uri-bytestring'...
$ git fetch origin 21b91b0c1950f0ac527475961313e556e294fd31:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-uri-bytestring
 * [new ref]         21b91b0c1950f0ac527475961313e556e294fd31 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 21b91b0 Convert to %autorelease and %autochangelog