Bazel bootstrap: use MODULE.bazel to get the version

This is more reliable than parsing CHANGELOG.md, which is not always the latest.

This requires us to maintain the Bazel version number in MODULE.bazel, which should be updated once a year on the master branch, but every time we do a minor/patch release.

PiperOrigin-RevId: 695747413
Change-Id: I63d572445d8cb6a76a3e079c2ea6f083257216b0

MODULE.bazel

@@ -5,6 +5,7 @@
 
 module(
     name = "bazel",
+    version = "9.0.0-prerelease",
     repo_name = "io_bazel",
 )
 

scripts/bootstrap/buildenv.sh

@@ -265,9 +265,8 @@ function git_date() {
 # Get the latest release version and append the date of
 # the last commit if any.
 function get_last_version() {
-  if [ -f "CHANGELOG.md" ]; then
-    local version="$(fgrep -m 1 '## Release' CHANGELOG.md \
-                       | sed -E 's|.*Release (.*) \(.*\)|\1|')"
+  if [ -f "MODULE.bazel" ]; then
+    local version=$(grep "version =" MODULE.bazel | head -n 1 | sed 's/.*version = "\(.*\)".*/\1/' | cut -d '"' -f2)
   else
     local version=""
   fi

src/test/shell/bazel/bazel_bootstrap_distfile_test.sh

@@ -145,15 +145,14 @@ default_java_toolchain(
 )
 EOF
 
-    # TODO(pcloudy): Uncomment this once the bootstrap test is fixed.
-    # ./output/bazel \
-    #   --server_javabase=$JAVABASE --host_jvm_args=--add-opens=java.base/java.nio=ALL-UNNAMED \
-    #   build --nobuild --repository_cache=derived/repository_cache \
-    #   --override_repository=$(cat derived/maven/MAVEN_CANONICAL_REPO_NAME)=derived/maven \
-    #   --java_language_version=${JAVA_VERSION} --tool_java_language_version=${JAVA_VERSION} \
-    #   --tool_java_runtime_version=local_jdk \
-    #   --extra_toolchains=fake_java_toolchain:all \
-    #   src:bazel_nojdk &> "${TEST_log}" || fail "analysis with bootstrapped Bazel failed"
+    ./output/bazel \
+      --server_javabase=$JAVABASE --host_jvm_args=--add-opens=java.base/java.nio=ALL-UNNAMED \
+      build --nobuild --repository_cache=derived/repository_cache \
+      --override_repository=$(cat derived/maven/MAVEN_CANONICAL_REPO_NAME)=derived/maven \
+      --java_language_version=${JAVA_VERSION} --tool_java_language_version=${JAVA_VERSION} \
+      --tool_java_runtime_version=local_jdk \
+      --extra_toolchains=fake_java_toolchain:all \
+      src:bazel_nojdk &> "${TEST_log}" || fail "analysis with bootstrapped Bazel failed"
 }
 
 run_suite "bootstrap test"