$ git clone -n https://src.fedoraproject.org/rpms/elfutils.git /var/lib/mock/f42-build-side-1-3534334-46548/root/chroot_tmpdir/scmroot/elfutils
Cloning into '/var/lib/mock/f42-build-side-1-3534334-46548/root/chroot_tmpdir/scmroot/elfutils'...
$ git fetch origin accba9105dc16f095930fe2a75aef0f559ccca65:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/elfutils
 * [new ref]         accba9105dc16f095930fe2a75aef0f559ccca65 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
Updating files:  54% (70/128)
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Updating files: 100% (128/128), done.
HEAD is now at accba91 Bump release version