$ git clone -n https://src.fedoraproject.org/rpms/ghc-haxr.git /var/lib/mock/f38-build-side-42-init-devel-690803-26825/root/chroot_tmpdir/scmroot/ghc-haxr
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-690803-26825/root/chroot_tmpdir/scmroot/ghc-haxr'...
$ git fetch origin 156cb3306c0632d927bde2f4e19a64635e60345f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-haxr
 * [new ref]         156cb3306c0632d927bde2f4e19a64635e60345f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 156cb33 Convert to %autorelease and %autochangelog