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deploy_jar creation uses args file to support long classpaths #942

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merged 3 commits into from
Jan 19, 2020
Merged

deploy_jar creation uses args file to support long classpaths #942

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deploy_jar creation uses args file to support long classpaths
ittaiz Jan 19, 2020
7453d7c
allow bazel to not always use param file
ittaiz Jan 19, 2020
0f05da2
linting
ittaiz Jan 19, 2020
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22 changes: 15 additions & 7 deletions scala/private/phases/phase_merge_jars.bzl
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Original file line number Diff line number Diff line change
Expand Up @@ -12,19 +12,27 @@ def phase_merge_jars(ctx, p):
Use --compression to reduce size of deploy jars.
"""
deploy_jar = ctx.outputs.deploy_jar
jars_list = p.compile.rjars.to_list()
runtime_jars = p.compile.rjars
main_class = getattr(ctx.attr, "main_class", "")
progress_message = "Merging Scala jar: %s" % ctx.label
args = ["--compression", "--normalize", "--sources"]
args.extend([j.path for j in jars_list])
args = ctx.actions.args()
args.add_all(["--compression", "--normalize", "--sources"])
args.add_all(runtime_jars, map_each = _fileToPath)

if main_class:
args.extend(["--main_class", main_class])
args.extend(["--output", deploy_jar.path])
args.add_all(["--main_class", main_class])
args.add_all(["--output", deploy_jar.path])

args.set_param_file_format("multiline")
args.use_param_file("@%s")
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what is that trick?

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https://docs.bazel.build/versions/master/skylark/lib/Args.html#use_param_file
Cool!

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Indeed :) I think it's not really clear why we need this param though so I opened this bazel issue bazelbuild/bazel#10616

ctx.actions.run(
inputs = jars_list,
inputs = runtime_jars,
outputs = [deploy_jar],
executable = ctx.executable._singlejar,
mnemonic = "ScalaDeployJar",
progress_message = progress_message,
arguments = args,
arguments = [args],
)

def _fileToPath(file):
return file.path
11 changes: 8 additions & 3 deletions test/src/main/scala/scalarules/test/large_classpath/BUILD
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Original file line number Diff line number Diff line change
@@ -1,4 +1,4 @@
load("//scala:scala.bzl", "scala_binary")
load("//scala:scala.bzl", "scala_binary", "scala_library")
load(":helper.bzl", "create_dependencies", "get_dependency_labels")

scala_binary(
Expand All @@ -8,12 +8,17 @@ scala_binary(
unused_dependency_checker_mode = "off",
visibility = ["//visibility:public"],
deps = get_dependency_labels(
amount = 250,
amount = 1000,
length = 20,
),
)

scala_library(
name = "triggerDeployJarCreation",
data = [":largeClasspath_deploy.jar"],
)

create_dependencies(
amount = 250,
amount = 1000,
length = 20,
)