$ git clone -n https://src.fedoraproject.org/rpms/rust-onefetch-image.git /var/lib/mock/f42-build-3264074-41244/root/chroot_tmpdir/scmroot/rust-onefetch-image
Cloning into '/var/lib/mock/f42-build-3264074-41244/root/chroot_tmpdir/scmroot/rust-onefetch-image'...
$ git fetch origin 30dad5f71a46751513a1594c6aebec460ffe41d2:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-onefetch-image
 * [new ref]         30dad5f71a46751513a1594c6aebec460ffe41d2 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 30dad5f Improve a regex in the .rpmlintrc file