$ git clone -n https://src.fedoraproject.org/rpms/c4project.git /var/lib/mock/f40-build-2692486-68212/root/chroot_tmpdir/scmroot/c4project
Cloning into '/var/lib/mock/f40-build-2692486-68212/root/chroot_tmpdir/scmroot/c4project'...
$ git fetch origin db36f54d69a71e3befdb02eb9b2d72465157bbc5:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/c4project
 * [new ref]         db36f54d69a71e3befdb02eb9b2d72465157bbc5 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at db36f54 Don’t install duplicate README.md and LICENSE.txt files