$ git clone -n https://src.fedoraproject.org/rpms/ghc-hxt.git /var/lib/mock/f38-build-side-42-init-devel-650909-26477/root/chroot_tmpdir/scmroot/ghc-hxt
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-650909-26477/root/chroot_tmpdir/scmroot/ghc-hxt'...
$ git fetch origin 1271f2999ccdfc715cf22b1d825eab923cbdc6a1:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-hxt
 * [new ref]         1271f2999ccdfc715cf22b1d825eab923cbdc6a1 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1271f29 Convert to %autorelease and %autochangelog