These rules are used for building R packages with Bazel. Although R has an excellent package management system, there is no continuous build and integration system for entire R package repositories. An advantage of using Bazel, over a custom solution of tracking the package dependency graph and triggering builds accordingly on each commit, is that R packages can be built and tested as part of one build system in multi-language monorepos.
These rules are mature for production use. We use these rules internally at GRAIL to build 400+ R packages from CRAN and Bioconductor.
The following assumes that you are familiar with how to use Bazel in general.
In order to use the rules, you must have bazel 0.18.1 or later and add the following to your WORKSPACE file:
# Change master to the git tag you want.
http_archive(
name = "com_grail_rules_r",
strip_prefix = "rules_r-master",
urls = ["https://github.com/grailbio/rules_r/archive/master.tar.gz"],
)
load("@com_grail_rules_r//R:dependencies.bzl", "r_register_toolchains", "r_rules_dependencies")
r_rules_dependencies()
r_register_toolchains()You can load the rules in your BUILD file like so:
load("@com_grail_rules_r//R:defs.bzl",
"r_pkg", "r_library", "r_unit_test", "r_pkg_test")There are also convenience macros available which create multiple implicit targets:
load("@com_grail_rules_r//R:defs.bzl", "r_package")and
load("@com_grail_rules_r//R:defs.bzl", "r_package_with_test")These rules assume that you have R installed on your system (we recommend 3.4.3
or above), and can be located using the PATH environment variable.
For each package, you can also specify a different Makevars file that can be
used to have finer control over native code compilation. For macOS, the
Makevars file used as default helps find gfortran. The site-wide
Makevars files are configured by default in the toolchains.
For macOS, this setup will help you cover the requirements for a large number of packages:
brew install gcc pkg-config icu4c openssl
For Ubuntu, this (or equivalent for other Unix systems) helps:
apt-get install pkgconf libssl-dev libxml2-dev libcurl4-openssl-dev
For no interference from other packages during the build (possibly other
versions installed manually by the user), it is recommended that packages other
than those with recommended priority be installed in the directory pointed to
by R_LIBS_USER. The Bazel build process will then be able to hide all the
other packages from R by setting a different value for R_LIBS_USER.
When moving to Bazel for installing R packages on your system, we recommend cleaning up existing machines:
Rscript \
-e 'options("repos"="https://cloud.r-project.org")' \
-e 'non_base_pkgs <- installed.packages(priority=c("recommended", "NA"))[, "Package"]' \
-e 'remove.packages(non_base_pkgs, lib=.Library)'
# If not set up already, create the directory for R_LIBS_USER.
Rscript \
-e 'dir.create(Sys.getenv("R_LIBS_USER"), recursive=TRUE, showWarnings=FALSE)'
For more details on how R searches different paths for packages, see libPaths.
To depend on external packages from CRAN and other remote repos, you can define the
packages as a CSV with three columns -- Package, Version, and sha256. Then use
repository_list rule to define R repositories for each package. For packages
not in a CRAN like repo (e.g. github), you can use r_repository rule directly. For
packages on your local system but outside your main repository, you will have to use
local_repository with a saved BUILD file. Same for VCS repositories.
load("@com_grail_rules_r//R:repositories.bzl", "r_repository", "r_repository_list")
# R packages with non-standard sources.
r_repository(
name = "R_plotly",
sha256 = "24c848fa2cbb6aed6a59fa94f8c9b917de5b777d14919268e88bff6c4562ed29",
strip_prefix = "plotly-a60510e4bbce5c6bed34ef6439d7a48cb54cad0a",
urls = [
"https://github.com/ropensci/plotly/archive/a60510e4bbce5c6bed34ef6439d7a48cb54cad0a.tar.gz",
],
)
# R packages with standard sources.
r_repository_list(
name = "r_repositories_bzl",
build_file_overrides = "@myrepo//third-party/R:build_file_overrides.csv",
package_list = "@myrepo//third-party/R:packages.csv",
remote_repos = {
"BioCsoft": "https://bioconductor.org/packages/3.6/bioc",
"BioCann": "https://bioconductor.org/packages/3.6/data/annotation",
"BioCexp": "https://bioconductor.org/packages/3.6/data/experiment",
"CRAN": "https://cloud.r-project.org",
},
)
load("@r_repositories_bzl//:r_repositories.bzl", "r_repositories")
r_repositories()
The list of all external R packages configured this way can be obtained from your shell with
$ bazel query 'filter(":R_", //external:*)'
NOTE: Periods ('.') in the package names are replaced with underscores ('_') because bazel does not allow periods in repository names.
Some examples are available in the tests directory of this repo.
- See tests/exampleA for a barebones R package.
- See tests/exampleB for a barebones R package that depends on another package.
- See tests/exampleC for an R package that depends on external R packages.
Also see Razel scripts that provide utility functions to generate BUILD files
and WORKSPACE rules for external packages.
Contributions are most welcome. Please submit a pull request giving the owners of this github repo access to your branch for minor style related edits, etc. We recommend opening an issue first to discuss the nature of your change before beginning work on it.
Please check open issues at the github repo.
r_pkg(srcs, pkg_name, deps, cc_deps, build_args, install_args, config_override, roclets,
roclets_deps, makevars, env_vars, inst_files, tools, build_tools)Rule to install the package and its transitive dependencies in the Bazel sandbox, so it can be depended upon by other package builds.
The builds produced from this rule are tested to be byte-for-byte reproducible with the same R installation.
| Implicit output targets | |
|---|---|
name.bin.tar.gz |
Binary archive of the package. |
name.tar.gz |
Source archive of the package. |
| Attributes | |
|---|---|
srcs |
Source files to be included for building the package. |
pkg_name |
Name of the package if different from the target name. |
deps |
R package dependencies of type `r_pkg`. |
cc_deps |
cc_library dependencies for this package. |
build_args |
Additional arguments to supply to R CMD build. |
install_args |
Additional arguments to supply to R CMD INSTALL. |
config_override |
Replace the package configure script with this file. |
roclets |
roclets to run before installing the package. If this is non-empty, then you must specify roclets_deps as the R package you want to use for running roclets. The runtime code will check if devtools is available and use `devtools::document`, failing which, it will check if roxygen2 is available and use `roxygen2::roxygenize`. |
roclets_deps |
roxygen2 or devtools dependency for running roclets. |
makevars |
Additional Makevars file supplied as R_MAKEVARS_USER. |
env_vars |
Extra environment variables to define for building the package. |
inst_files |
Files to be bundled with the package through the inst directory. The values of the dictionary will specify the package relative destination path. For example, '' will bundle the files to the top level directory, and 'mydir' will bundle all files into a directory mydir. |
tools |
Executables that code in this package will try to find in the system. |
build_tools |
Executables that native code compilation will try to find in the system. |
r_library(pkgs, library_path)Executable rule to install the given packages and all dependencies to a user provided or system default R library. Run the target with --help for usage information.
The rule used to provide a tar archive of the library as an implicit output.
That feature is now it's own rule -- r_library_tar. See documentation for
r_library_tar rule and example usage for
container_image rule.
| Attributes | |
|---|---|
pkgs |
Package (and dependencies) to install. |
library_path |
If different from system default, default library location for installation. For runtime overrides, use bazel run [target] -- -l [path]. |
r_unit_test(pkg, suggested_deps)Rule to keep all deps in the sandbox, and run the provided R test scripts.
When run with bazel coverage, this rule will also produce a coverage report
in Cobertura XML format. The coverage report will contain coverage for R code
in the package, and C/C++ code in the src directory of R packages.
| Attributes | |
|---|---|
pkg |
R package (of type r_pkg) to test. |
suggested_deps |
R package dependencies of type `r_pkg`. |
env_vars |
Extra environment variables to define before running the test. |
tools |
Executables to be made available to the test. |
r_pkg_test(pkg, suggested_deps, check_args)Rule to keep all deps of the package in the sandbox, build a source archive of this package, and run R CMD check on the package source archive in the sandbox.
| Attributes | |
|---|---|
pkg |
R package (of type r_pkg) to test. |
suggested_deps |
R package dependencies of type `r_pkg`. |
check_args |
Additional arguments to supply to R CMD check. |
env_vars |
Extra environment variables to define before running the test. |
tools |
Executables to be made available to the test. |
r_binary(name, src, deps, data, env_vars, tools, rscript_args, script_args)Build a wrapper shell script for running an executable which will have all the specified R packages available.
The target can be executed standalone, with bazel run, or called from other
executables if RUNFILES_DIR is exported in the environment with
the runfiles of the root executable.
| Attributes | |
|---|---|
src |
An Rscript interpreted file, or file with executable permissions. |
deps |
Dependencies of type |
data |
Files needed by this rule at runtime. |
env_vars |
Extra environment variables to define before running the binary. |
tools |
Executables to be made available to the binary. |
rscript_args |
If src file does not have executable permissions, arguments for the Rscript interpreter. We recommend using the shebang line and giving your script execute permissions instead of using this. |
script_args |
A list of arguments to pass to the src script. |
r_test(name, src, deps, data, env_vars, tools, rscript_args, script_args)This is identical to r_binary but is run as a test.
r_markdown(name, src, deps, data, env_vars, tools, rscript_args, script_args,
render_function="rmarkdown::render", input_argument="input", output_dir_argument="output_dir",
render_args)This rule renders an R markdown through generating a stub to call the render
function. The render function and the argument names for the function are
default set for rmarkdown::render but can be customized. Note that
render_args will need to be quoted appropriately if set. This rule can be
used wherever an r_binary rule can be used.
If arguments are given on the command line when running the target, flags of
the form --arg=value are passed as keyword arguments to the render
function. The values can be arbitrary R expressions, and strings will need to
be quoted. The last argument without the prefix -- will be the output
directory, else the output directory will be the default output
directory of the render function, typically the same directory as the input
file.
r_toolchain(r, rscript, version, args, makevars_site, env_vars, tools, files)Toolchain to specify the tools and environment for performing build actions. Also see r_register_toolchains for how to configure the default registered toolchains.
| Attributes | |
|---|---|
r |
Path to R. |
rscript |
Path to Rscript. |
version |
If provided, ensure version of R matches this string in x.y form. |
args |
Arguments to R and Rscript, in addition to `--slave --no-restore --no-init-file`. |
makevars_site |
Site-wide Makevars file. |
env_vars |
Environment variables for BUILD actions. |
tools |
Additional tools to make available in PATH. |
files |
Additional files available to the BUILD actions. |
r_repository(urls, strip_prefix, type, sha256, build_file)Repository rule in place of new_http_archive that can run razel to generate
the BUILD file automatically.
| Attributes | |
|---|---|
urls |
URLs from which the package source archive can be fetched. |
strip_prefix |
The prefix to strip from all file paths in the archive. |
type |
Type of the archive file (zip, tgz, etc.). |
sha256 |
sha256 checksum of the archive to verify. |
build_file |
Optional BUILD file for this repo. If not provided, one will be generated. |
razel_args |
Other arguments to supply to buildify function in razel. |
r_repository_list(package_list, build_file_overrides, remote_repos, other_args)Repository rule that will generate a bzl file containing a macro, to be called
as r_repositories(), for r_repository definitions for packages in
package_list CSV.
| Attributes | |
|---|---|
package_list |
CSV containing packages with name, version and sha256; with a header. |
build_file_overrides |
CSV containing package name and BUILD file path; with a header. |
remote_repos |
Repos to use for fetching the archives. |
other_args |
Other arguments to supply to generateWorkspaceMacro function in razel. |
r_rules_dependencies()Repository rule that provides repository definitions for dependencies of the BUILD system. One such dependency is the site-wide Makevars file for macOS.
r_coverage_dependencies()Repository rule that provides repository definitions for dependencies in computing code coverage for unit tests. Not needed if users already have a repository definition for the covr package.
r_register_toolchains(r_home, strict, makevars_site, version, args, tools)Repository rule that generates and registers a platform independent toolchain of type r_toolchain based on the user's system and environment. If you want to register your own toolchain for specific platforms, register them before calling this function in your WORKSPACE file to give them preference.
| Attributes | |
|---|---|
r_home |
A path to `R_HOME` (as returned from `R RHOME`). If not specified, the rule looks for R and Rscript in `PATH`. The environment variable `BAZEL_R_HOME` takes precendence over this value. |
strict |
Fail if R is not found on the host system. |
makevars_site |
Generate a site-wide Makevars file. |
version |
version attribute value for r_toolchain. |
args |
args attribute value for r_toolchain. |
tools |
tools attribute value for r_toolchain. |
r_package(pkg_name, pkg_srcs, pkg_deps, pkg_suggested_deps=[])Convenience macro to generate the r_pkg and r_library targets.
r_package_with_test(pkg_name, pkg_srcs, pkg_deps, pkg_suggested_deps=[], test_timeout="short")Convenience macro to generate the r_pkg, r_library,
r_unit_test, and r_pkg_test targets.