multi_sass_binary permission denied exclusive packages same directory

[eachirei]

Reproduction: Folder sass_test, containing empty files A.scss and B.scss.

load("@io_bazel_rules_sass//:defs.bzl", "multi_sass_binary")

SHARED_COMPONENTS = [
    "B.*"
]

print(glob(["*.scss"], exclude = SHARED_COMPONENTS))

multi_sass_binary(
  name = "A",
  srcs = glob(["*.scss"], exclude = SHARED_COMPONENTS)
)

print(glob(SHARED_COMPONENTS, exclude = ["*.html", "*.ts"]))

multi_sass_binary(
  name = "B",
  srcs = glob(SHARED_COMPONENTS, exclude = ["*.html", "*.ts"])
)

Output

bazel build //src/sass_test:A --verbose_failures
DEBUG: ../src/sass_test/BUILD.bazel:7:1: ["A.scss"]
DEBUG: ../src/sass_test/BUILD.bazel:14:1: ["B.scss"]
INFO: Analyzed target //src/sass_test:A (128 packages loaded, 1706 targets configured).
INFO: Found 1 target...
Target //src/sass_test:A up-to-date:
  dist/bin/src/sass_test/A.css
  dist/bin/src/sass_test/A.css.map
INFO: Elapsed time: 1.777s, Critical Path: 0.40s
INFO: 1 process: 1 local.
INFO: Build completed successfully, 7 total actions

bazel build //src/sass_test:B --verbose_failures
DEBUG: ../src/sass_test/BUILD.bazel:7:1: ["A.scss"]
DEBUG: ../src/sass_test/BUILD.bazel:14:1: ["B.scss"]
INFO: Analyzed target //src/sass_test:B (0 packages loaded, 2 targets configured).
INFO: Found 1 target...
ERROR: ../src/sass_test/BUILD.bazel:16:1: Compiling Sass failed (Exit 66): sass failed: error executing command 
  (cd /private/var/tmp/_bazel_username/uuid/execroot/project && \
  exec env - \
  bazel-out/host/bin/external/io_bazel_rules_sass/sass/sass --style compressed --load-path src/sass_test src/sass_test:bazel-out/darwin-fastbuild/bin/src/sass_test)
Execution platform: @bazel_tools//platforms:host_platform
Error reading bazel-out/darwin-fastbuild/bin/src/sass_test/A.css.map: permission denied.
Target //src/sass_test:B failed to build
INFO: Elapsed time: 0.361s, Critical Path: 0.24s
INFO: 0 processes.
FAILED: Build did NOT complete successfully

Am I doing something wrong? The use-case would be the following: Angular project, has 2 modules inside same folder for convenience; module A is standalone, but module B is used by another module, yet both share the same scope so to say.

[nex3]

It looks like multi_sass_binary isn't actually using the srcs to generate the Sass command line; it's implicitly assuming that all Sass files will be compiled. @kyliau, would you be able to look into fixing that? We should probably generate a separate input:output pair ourselves for each source file.

As an aside, it's a good idea to avoid multi_sass_binary when doing anything complex. It's provided as a way of getting projects up and running quickly, but it doesn't provide any tracking of the actual dependency tree of Sass files so it'll end up doing a lot of extra work on each recompilation that would be avoided with fine-grained use of sass_library and sass_binary.

[eachirei]

How should I write a bazel file for an angular module with multiple components without multi_sass_binary and without modifying it each time we add or remove a new component? Cause that can become quite a hassle, especially for new developers coming to the project. I'm not asking this in a mean way, I'm just trying to understand better the whole bazel environment.

[nex3]

In general, you should expect to update your BUILD files whenever you change the dependency structure of your app. That's an inherent constraint of incremental rebuilds in a builds system like Bazel where the configuration is defined strictly independently of the contents of the input files.

You can mitigate this overhead with an automated BUILD file generator; https://github.com/bazelbuild/rules_sass/pull/75 is a work in progress in that direction.

[Serginho]

👍 Same problem.