$ git clone -n https://src.fedoraproject.org/rpms/R-forcats.git /var/lib/mock/f42-build-side-1-3501743-45976/root/chroot_tmpdir/scmroot/R-forcats
Cloning into '/var/lib/mock/f42-build-side-1-3501743-45976/root/chroot_tmpdir/scmroot/R-forcats'...
$ git fetch origin 71a69e0883dde5ef9519d79669991b96557096dd:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-forcats
 * [new ref]         71a69e0883dde5ef9519d79669991b96557096dd -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 71a69e0 R-maint-sig mass rebuild