[bazelisk] Use Bazel 7.1.2 (#349)

install_prereqs: Use Bazelisk
environ.bzl: Use workaround for attr.string_list() from Anzu

Co-authored-by: Jeremy Nimmer <jeremy.nimmer@tri.global>

.lint/.bazeliskrc

@@ -1,3 +1,3 @@
 # When bazelisk in use, this dotfile specifies which version of Bazel should be
 # used to build and test.
-USE_BAZEL_VERSION=6.4.0
+USE_BAZEL_VERSION=7.1.2

.lint/.bazelrc

@@ -0,0 +1,2 @@
+# Import base-level build configuration.
+import %workspace%/../default.bazelrc

bazel_ros2_rules/.bazeliskrc

@@ -1,3 +1,3 @@
 # When bazelisk in use, this dotfile specifies which version of Bazel should be
 # used to build and test.
-USE_BAZEL_VERSION=6.4.0
+USE_BAZEL_VERSION=7.1.2

bazel_ros2_rules/setup/install_prereqs.sh

@@ -50,10 +50,12 @@ function dpkg_install_from_curl() {
 
 apt install g++ unzip zlib1g-dev
 
+# TODO(eric.cousineau) Once there's a bazelisk 1.20 that incorporates pr563, we
+# should switch to using that here.
 dpkg_install_from_curl \
-  bazel 6.4.0 \
-  https://github.com/bazelbuild/bazel/releases/download/6.4.0/bazel_6.4.0-linux-x86_64.deb \
-  9276a1e11f03e9f7492f009803c95bddc307993c9ab3c463721c9f6cdaa2ccc1
+  bazelisk 1.19.0 \
+  https://drake-mirror.csail.mit.edu/github/bazelbuild/bazelisk/pr563/bazelisk_1.19.0-9-g58a850f_amd64.deb \
+  c2bfd15d6c3422ae540cda9facc0ac395005e2701c09dbb15d40447b53e831d4
 
 # Install Python dependencies
 apt install python3 python3-toposort python3-dev python-is-python3

default.bazelrc

@@ -1,3 +1,6 @@
+# Don't use bzlmod (yet); eventually we'll want to enable this.
+common --enable_bzlmod=false
+
 # Use C++20.
 build --cxxopt=-std=c++20
 build --host_cxxopt=-std=c++20

drake_ros/.bazeliskrc

@@ -1,3 +1,3 @@
 # When bazelisk in use, this dotfile specifies which version of Bazel should be
 # used to build and test.
-USE_BAZEL_VERSION=6.4.0
+USE_BAZEL_VERSION=7.1.2

drake_ros_examples/.bazeliskrc

@@ -1,3 +1,3 @@
 # When bazelisk in use, this dotfile specifies which version of Bazel should be
 # used to build and test.
-USE_BAZEL_VERSION=6.4.0
+USE_BAZEL_VERSION=7.1.2

ros2_example_bazel_installed/.bazeliskrc

@@ -1,3 +1,3 @@
 # When bazelisk in use, this dotfile specifies which version of Bazel should be
 # used to build and test.
-USE_BAZEL_VERSION=6.4.0
+USE_BAZEL_VERSION=7.1.2

ros2_example_bazel_installed/setup/install_prereqs.sh

@@ -58,11 +58,12 @@ function dpkg_install_from_curl() {
 
 apt install g++ unzip zlib1g-dev
 
-# TODO(sloretz) Make sure the version of bazel is exactly the same as the one used by Drake
+# TODO(eric.cousineau) Once there's a bazelisk 1.20 that incorporates pr563, we
+# should switch to using that here.
 dpkg_install_from_curl \
-  bazel 6.4.0 \
-  https://github.com/bazelbuild/bazel/releases/download/6.4.0/bazel_6.4.0-linux-x86_64.deb \
-  9276a1e11f03e9f7492f009803c95bddc307993c9ab3c463721c9f6cdaa2ccc1
+  bazelisk 1.19.0 \
+  https://drake-mirror.csail.mit.edu/github/bazelbuild/bazelisk/pr563/bazelisk_1.19.0-9-g58a850f_amd64.deb \
+  c2bfd15d6c3422ae540cda9facc0ac395005e2701c09dbb15d40447b53e831d4
 
 # If the user did not explicitly specify their installation prefix, install
 # ROS 2 Humble.

ros2_example_bazel_installed/tools/environ.bzl

@@ -1,31 +1,46 @@
-# -*- python -*-
+# -*- mode: python -*-
+# vi: set ft=python :
 
-def _environment_repository_impl(repo_ctx):
-    environ = {
-        envvar: repo_ctx.os.environ.get(envvar, "")
-        for envvar in repo_ctx.attr._envvars
-    }
-    repo_ctx.file(
+# Write out a repository that contains:
+# - An empty BUILD file, to define a package.
+# - An environ.bzl file with variable assignments for each ENV_NAMES item.
+def _impl(repository_ctx):
+    envvars = repository_ctx.attr.envvars
+    bzl_content = []
+    for key in envvars:
+        value = repository_ctx.os.environ.get(key, "")
+        bzl_content.append("{}='{}'\n".format(key, value))
+    repository_ctx.file(
         "BUILD.bazel",
-        content = "# Empty build file to mark repository root.\n",
+        content = "\n",
         executable = False,
     )
-    repo_ctx.file(
+    repository_ctx.file(
         "environ.bzl",
-        content = "\n".join([
-            "{}=\"{}\"".format(name, value)
-            for name, value in environ.items()
-        ]),
+        content = "".join(bzl_content),
         executable = False,
     )
 
-def environment_repository(name, envvars):
+_string_list = attr.string_list()
+
+def environment_repository(name = None, envvars = []):
+    """Provide specific environment variables for use in a WORKSPACE file.
+    The `envvars` are the environment variables to provide.
+
+    Example:
+        environ_repository(name = "foo", envvars = ["BAR", "BAZ"])
+        load("@foo//:environ.bzl", "BAR", "BAZ")
+        print(BAR)
+    """
     rule = repository_rule(
+        implementation = _impl,
         attrs = {
-            "_envvars": attr.string_list(default = envvars),
+            "envvars": _string_list,
         },
-        implementation = _environment_repository_impl,
-        environ = envvars,
         local = True,
+        environ = envvars,
+    )
+    rule(
+        name = name,
+        envvars = envvars,
     )
-    rule(name = name)