Windows: fix writing java.log

Fixes #6099
Fixes #6098
Related to #2576

Change-Id: Iabff91cca715d08e2977234e8615b2e0bf8a5dbc

Closes #6100.

Change-Id: Ib55e01b5a82315d2a5f1a861f56079013d1cfec8
PiperOrigin-RevId: 211983456

src/main/cpp/startup_options.cc

@@ -536,9 +536,9 @@ blaze_exit_code::ExitCode StartupOptions::AddJVMArguments(
 
 void StartupOptions::AddJVMLoggingArguments(std::vector<string> *result) const {
   // Configure logging
-  const string propFile =
-      blaze_util::JoinPath(output_base, "javalog.properties");
-  string java_log(
+  const string propFile = blaze_util::PathAsJvmFlag(
+      blaze_util::JoinPath(output_base, "javalog.properties"));
+  const string java_log(
       blaze_util::PathAsJvmFlag(blaze_util::JoinPath(output_base, "java.log")));
   if (!blaze_util::WriteFile("handlers=java.util.logging.FileHandler\n"
                              ".level=INFO\n"

src/main/cpp/util/path_windows.cc

@@ -119,18 +119,37 @@ bool CompareAbsolutePaths(const std::string& a, const std::string& b) {
 }
 
 std::string PathAsJvmFlag(const std::string& path) {
-  std::string spath;
+  std::string cpath;
   std::string error;
-  if (!AsShortWindowsPath(path, &spath, &error)) {
+  if (!AsWindowsPath(path, &cpath, &error)) {
     BAZEL_DIE(blaze_exit_code::LOCAL_ENVIRONMENTAL_ERROR)
-        << "PathAsJvmFlag(" << path
-        << "): AsShortWindowsPath failed: " << error;
+        << "PathAsJvmFlag(" << path << "): AsWindowsPath failed: " << error;
   }
-  // Convert backslashes to forward slashes, in order to avoid the JVM parsing
-  // Windows paths as if they contained escaped characters.
-  // See https://github.com/bazelbuild/bazel/issues/2576
-  std::replace(spath.begin(), spath.end(), '\\', '/');
-  return spath;
+  // Convert forward slashes and backslashes to double (escaped) backslashes, so
+  // they are safe to pass on the command line to the JVM and the JVM won't
+  // misinterpret them.
+  // See https://github.com/bazelbuild/bazel/issues/2576 and
+  // https://github.com/bazelbuild/bazel/issues/6098
+  size_t separators = 0;
+  for (const auto& c : cpath) {
+    if (c == '/' || c == '\\') {
+      separators++;
+    }
+  }
+  // In the result we replace each '/' and '\' with "\\", i.e. the total size
+  // *increases* by `separators`.
+  // Create a string of that size, filled with zeroes.
+  std::string result(/* count */ cpath.size() + separators, '\0');
+  std::string::size_type i = 0;
+  for (const auto& c : cpath) {
+    if (c == '/' || c == '\\') {
+      result[i++] = '\\';
+      result[i++] = '\\';
+    } else {
+      result[i++] = c;
+    }
+  }
+  return result;
 }
 
 void AddUncPrefixMaybe(std::wstring* path) {

src/test/shell/integration/execution_phase_tests.sh

@@ -105,9 +105,6 @@ function assert_cache_stats() {
 #### TESTS #############################################################
 
 function test_cache_computed_file_digests_behavior() {
-  # Does not work on Windows, https://github.com/bazelbuild/bazel/issues/6098
-  return
-
   local -r pkg="${FUNCNAME}"
   mkdir -p "$pkg" || fail "could not create \"$pkg\""
 
@@ -168,9 +165,8 @@ EOF
   assert_cache_stats "miss count" 1  # volatile-status.txt
 }
 
-function test_cache_computed_file_digests_uncaught_changes() {
-  return
-
+function DISABLED_test_cache_computed_file_digests_uncaught_changes() {
+  # Does not work on Windows, https://github.com/bazelbuild/bazel/issues/6098
   local timestamp=201703151112.13  # Fixed timestamp to mark our file with.
 
   mkdir -p package || fail "mkdir failed"
@@ -230,9 +226,6 @@ EOF
 }
 
 function test_cache_computed_file_digests_ui() {
-  # Does not work on Windows, https://github.com/bazelbuild/bazel/issues/6098
-  return
-
   local -r pkg="${FUNCNAME}"
   mkdir -p "$pkg" || fail "could not create \"$pkg\""
 
@@ -257,8 +250,6 @@ function test_cache_computed_file_digests_ui() {
 }
 
 function test_jobs_default_auto() {
-  return
-
   local -r pkg="${FUNCNAME}"
   mkdir -p "$pkg" || fail "could not create \"$pkg\""
 
@@ -279,8 +270,6 @@ function test_jobs_default_auto() {
 }
 
 function test_analysis_warning_cached() {
-  return
-
   mkdir -p "foo" "bar" || fail "Could not create directories"
   cat > foo/BUILD <<'EOF' || fail "foo/BUILD"
 cc_library(

src/test/shell/integration/server_logging_test.sh

@@ -67,9 +67,6 @@ fi
 #### TESTS #############################################################
 
 function test_log_file_uses_single_line_formatter() {
-  # Does not work on Windows, https://github.com/bazelbuild/bazel/issues/6098
-  return
-
   local client_log="$(bazel info output_base)/java.log"
 
   # Construct a regular expression to match a sample message in the log using