jonkeane commented on a change in pull request #10841:
URL: https://github.com/apache/arrow/pull/10841#discussion_r680595069
##########
File path: ci/scripts/r_deps.sh
##########
@@ -25,7 +25,12 @@ source_dir=${1}/r
pushd ${source_dir}
# Install R package dependencies
-${R_BIN} -e "install.packages('remotes'); remotes::install_cran(c('glue',
'rcmdcheck', 'sys'))"
-${R_BIN} -e "remotes::install_deps(dependencies = TRUE)"
+# install.packages() emits warnings if packages fail to install,
+# but we want to error/fail the build.
+# options(warn=2) turns warnings into errors
+${R_BIN} -e "options(warn=2); install.packages('remotes');
remotes::install_cran(c('glue', 'rcmdcheck', 'sys')); remotes::install_deps()"
+# Separately install the optional/test dependencies but don't error on them,
+# they're not available everywhere and that's ok
+${R_BIN} -e "remotes::install_deps(dependencies = 'Suggests')"
Review comment:
```suggestion
${R_BIN} -e "remotes::install_deps(dependencies = TRUE)"
```
I think that we don't actually want to use "Suggests" here, because it
appears that in remotes, that is then [used recursively with all of the
Suggested packages if I'm reading
correctly](https://github.com/r-lib/remotes/blob/3e35a1f41ce4923088a4c2b0ca463ea1d81377cb/R/install.R#L198)
which is why we are suddenly installing many more packages + seeing failures
we didn't have before.
Using `dependencies = TRUE` is a little silly since part of them were
already installed in the line above, but should restore the behavior we want of
only installing our Suggests + their (hard) dependencies rather than our
Suggests + their Suggests + ...
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