bazel: allow offline build of major versions 5 and 6 (#41575)

* bazel: allow offline build of major versions 5 and 6; add variant download_data

* bazel: add maintainer LydDeb

* bazel: install offline only; remove variant download_data

* bazel: fix variable name: resource_dico --> resource_dictionary

* bazel: fix style

* bazel: fix the build of version 4

* bazel: add comment about resources

* bazel: access to resource stages with self.stage

* bazel: add except to solve AttributeError: 'Stage' object has no attribute 'resource'

---------

Co-authored-by: LydDeb <lyderic.debusschere@eolen.com>

var/spack/repos/builtin/packages/bazel/package.py

@@ -18,6 +18,8 @@ class Bazel(Package):
     homepage = "https://bazel.build/"
     url = "https://github.com/bazelbuild/bazel/releases/download/3.1.0/bazel-3.1.0-dist.zip"
 
+    maintainers("LydDeb")
+
     tags = ["build-tools"]
 
     license("Apache-2.0")
@@ -120,6 +122,39 @@ class Bazel(Package):
 
     executables = ["^bazel$"]
 
+    # Download resources to perform offline build with bazel.
+    # The following URLs and sha256 are in the file distdir_deps.bzl at the root of bazel sources.
+    resource_dictionary = {}
+    resource_dictionary["bazel_skylib"] = {
+        "url": "https://github.com/bazelbuild/bazel-skylib/releases/download/1.0.1/bazel-skylib-1.0.1.tar.gz",
+        "sha256": "f1c8360c01fcf276778d3519394805dc2a71a64274a3a0908bc9edff7b5aebc8",
+        "when": "@4:6",
+    }
+    resource_dictionary["zulu_11_56_19"] = {
+        "url": "https://mirror.bazel.build/cdn.azul.com/zulu/bin/zulu11.56.19-ca-jdk11.0.15-linux_x64.tar.gz",
+        "sha256": "e064b61d93304012351242bf0823c6a2e41d9e28add7ea7f05378b7243d34247",
+        "when": "@6",
+    }
+    resource_dictionary["zulu_11_50_19"] = {
+        "url": "https://mirror.bazel.build/openjdk/azul-zulu11.50.19-ca-jdk11.0.12/zulu11.50.19-ca-jdk11.0.12-linux_x64.tar.gz",
+        "sha256": "b8e8a63b79bc312aa90f3558edbea59e71495ef1a9c340e38900dd28a1c579f3",
+        "when": "@5",
+    }
+    resource_dictionary["zulu_11_37_17"] = {
+        "url": "https://mirror.bazel.build/openjdk/azul-zulu11.37.17-ca-jdk11.0.6/zulu11.37.17-ca-jdk11.0.6-linux_x64.tar.gz",
+        "sha256": "360626cc19063bc411bfed2914301b908a8f77a7919aaea007a977fa8fb3cde1",
+        "when": "@4",
+    }
+    for resource_name in resource_dictionary.keys():
+        resource(
+            when=resource_dictionary[resource_name]["when"],
+            name=resource_name,
+            url=resource_dictionary[resource_name]["url"],
+            sha256=resource_dictionary[resource_name]["sha256"],
+            destination="archive",
+            expand=False,
+        )
+
     @classmethod
     def determine_version(cls, exe):
         output = Executable(exe)("version", output=str, error=str)
@@ -132,14 +167,24 @@ def setup_build_environment(self, env):
         env.set("BAZEL_LINKOPTS", "")
         env.set("BAZEL_LINKLIBS", "-lstdc++")
 
-        env.set(
+        # .WARNING: Option 'host_javabase' is deprecated
-            "EXTRA_BAZEL_ARGS",
+        # Use local java installation
-            # Spack's logs don't handle colored output well
+        args = "--color=no --define=ABSOLUTE_JAVABASE={0} --verbose_failures --jobs={1}".format(
-            "--color=no --host_javabase=@local_jdk//:jdk"
+            self.spec["java"].prefix, make_jobs
-            # Enable verbose output for failures
-            " --verbose_failures --jobs={0}".format(make_jobs),
         )
 
+        resource_stages = self.stage[1:]
+        for _resource in resource_stages:
+            try:
+                resource_name = _resource.resource.name
+                if self.spec.satisfies(self.resource_dictionary[resource_name]["when"]):
+                    archive_path = _resource.source_path
+                    args += " --distdir={0}".format(archive_path)
+            except AttributeError:
+                continue
+
+        env.set("EXTRA_BAZEL_ARGS", args)
+
     @run_before("install")
     def bootstrap(self):
         bash = which("bash")