$ git clone -n https://src.fedoraproject.org/rpms/elfutils.git /var/lib/mock/f41-build-860547-168972/root/chroot_tmpdir/scmroot/elfutils
Cloning into '/var/lib/mock/f41-build-860547-168972/root/chroot_tmpdir/scmroot/elfutils'...
$ git fetch origin 72bb5b7f423a9c807e862b99827a43d925afaced:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/elfutils
 * [new ref]         72bb5b7f423a9c807e862b99827a43d925afaced -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
Updating files:  55% (72/130)
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Updating files: 100% (130/130)
Updating files: 100% (130/130), done.
HEAD is now at 72bb5b7 0.192-4 - Enable eu-stacktrace on x86_64