$ git clone -n https://src.fedoraproject.org/rpms/R-tidyr.git /var/lib/mock/f38-build-724258-99404/root/chroot_tmpdir/scmroot/R-tidyr
Cloning into '/var/lib/mock/f38-build-724258-99404/root/chroot_tmpdir/scmroot/R-tidyr'...
$ git fetch origin 45418af2e3cb776a661adb3b44ac626bb67b21bb:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-tidyr
 * [new ref]         45418af2e3cb776a661adb3b44ac626bb67b21bb -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 45418af Ignore vignettes