$ git clone -n https://src.fedoraproject.org/rpms/pkgtreediff.git /var/lib/mock/f38-build-side-42-init-devel-1083689-29947/root/chroot_tmpdir/scmroot/pkgtreediff
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-1083689-29947/root/chroot_tmpdir/scmroot/pkgtreediff'...
$ git fetch origin 42d78421d239bc5a8b70478a3dc39486cd22e184:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/pkgtreediff
 * [new ref]         42d78421d239bc5a8b70478a3dc39486cd22e184 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 42d7842 refresh to cabal-rpm-2.1.0 with SPDX migration