From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Jeremy Apthorp <jeremya@chromium.org>
Date: Thu, 14 May 2020 16:52:09 -0700
Subject: crash: allow disabling compression on linux

This makes compression optional on breakpad_linux.

Upstream attempted here
https://chromium-review.googlesource.com/c/chromium/src/+/2198641, but
was denied.

Ultimately we should remove the option to disable compression, and
subsequently remove this patch.

diff --git a/components/crash/core/app/breakpad_linux.cc b/components/crash/core/app/breakpad_linux.cc
index 8df14f416ee321e1259433715a61fa6025207d80..1d7f38d3f89d9c7f110cc9eb880264464787eb32 100644
--- a/components/crash/core/app/breakpad_linux.cc
+++ b/components/crash/core/app/breakpad_linux.cc
@@ -110,6 +110,8 @@ void SetUploadURL(const std::string& url) {
   DCHECK(!g_upload_url);
   g_upload_url = strdup(url.c_str());
 }
+
+bool g_compress_uploads = true;
 #endif
 
 bool g_is_node = false;
@@ -1322,56 +1324,60 @@ void ExecUploadProcessOrTerminate(const BreakpadInfo& info,
 
 #else   // BUILDFLAG(IS_CHROMEOS_ASH)
 
-  // Compress |dumpfile| with gzip.
-  const pid_t gzip_child = sys_fork();
-  if (gzip_child < 0) {
-    static const char msg[] = "sys_fork() for gzip process failed.\n";
-    WriteLog(msg, sizeof(msg) - 1);
-    sys__exit(1);
-  }
-  if (!gzip_child) {
-    // gzip process.
-    const char* args[] = {
-      "/bin/gzip",
-      "-f",  // Do not prompt to verify before overwriting.
-      dumpfile,
-      nullptr,
-    };
-    execve(args[0], const_cast<char**>(args), environ);
-    static const char msg[] = "Cannot exec gzip.\n";
-    WriteLog(msg, sizeof(msg) - 1);
-    sys__exit(1);
-  }
-  // Wait for gzip process.
-  int status = 0;
-  if (sys_waitpid(gzip_child, &status, 0) != gzip_child ||
-      !WIFEXITED(status) || WEXITSTATUS(status) != 0) {
-    static const char msg[] = "sys_waitpid() for gzip process failed.\n";
-    WriteLog(msg, sizeof(msg) - 1);
-    sys_kill(gzip_child, SIGKILL);
-    sys__exit(1);
-  }
+  if (g_compress_uploads) {
+    // Compress |dumpfile| with gzip.
+    const pid_t gzip_child = sys_fork();
+    if (gzip_child < 0) {
+      static const char msg[] = "sys_fork() for gzip process failed.\n";
+      WriteLog(msg, sizeof(msg) - 1);
+      sys__exit(1);
+    }
+    if (!gzip_child) {
+      // gzip process.
+      const char* args[] = {
+          "/bin/gzip",
+          "-f",  // Do not prompt to verify before overwriting.
+          dumpfile,
+          nullptr,
+      };
+      execve(args[0], const_cast<char**>(args), environ);
+      static const char msg[] = "Cannot exec gzip.\n";
+      WriteLog(msg, sizeof(msg) - 1);
+      sys__exit(1);
+    }
+    // Wait for gzip process.
+    int status = 0;
+    if (sys_waitpid(gzip_child, &status, 0) != gzip_child ||
+        !WIFEXITED(status) || WEXITSTATUS(status) != 0) {
+      static const char msg[] = "sys_waitpid() for gzip process failed.\n";
+      WriteLog(msg, sizeof(msg) - 1);
+      sys_kill(gzip_child, SIGKILL);
+      sys__exit(1);
+    }
 
-  static const char kGzipExtension[] = ".gz";
-  const size_t gzip_file_size = my_strlen(dumpfile) + sizeof(kGzipExtension);
-  char* const gzip_file = reinterpret_cast<char*>(allocator->Alloc(
-      gzip_file_size));
-  my_strlcpy(gzip_file, dumpfile, gzip_file_size);
-  my_strlcat(gzip_file, kGzipExtension, gzip_file_size);
+    static const char kGzipExtension[] = ".gz";
+    const size_t gzip_file_size = my_strlen(dumpfile) + sizeof(kGzipExtension);
+    char* const gzip_file =
+        reinterpret_cast<char*>(allocator->Alloc(gzip_file_size));
+    my_strlcpy(gzip_file, dumpfile, gzip_file_size);
+    my_strlcat(gzip_file, kGzipExtension, gzip_file_size);
 
-  // Rename |gzip_file| to |dumpfile| (the original file was deleted by gzip).
-  if (rename(gzip_file, dumpfile)) {
-    static const char msg[] = "Failed to rename gzipped file.\n";
-    WriteLog(msg, sizeof(msg) - 1);
-    sys__exit(1);
+    // Rename |gzip_file| to |dumpfile| (the original file was deleted by gzip).
+    if (rename(gzip_file, dumpfile)) {
+      static const char msg[] = "Failed to rename gzipped file.\n";
+      WriteLog(msg, sizeof(msg) - 1);
+      sys__exit(1);
+    }
   }
 
   // The --header argument to wget looks like:
   //   --header=Content-Encoding: gzip
   //   --header=Content-Type: multipart/form-data; boundary=XYZ
   // where the boundary has two fewer leading '-' chars
-  static const char header_content_encoding[] =
+  static const char header_content_encoding_gzip[] =
       "--header=Content-Encoding: gzip";
+  static const char header_content_encoding_identity[] =
+      "--header=Content-Encoding: identity";
   static const char header_msg[] =
       "--header=Content-Type: multipart/form-data; boundary=";
   const size_t header_content_type_size =
@@ -1398,7 +1404,8 @@ void ExecUploadProcessOrTerminate(const BreakpadInfo& info,
   static const char kWgetBinary[] = "/usr/bin/wget";
   const char* args[] = {
       kWgetBinary,
-      header_content_encoding,
+      g_compress_uploads ? header_content_encoding_gzip
+                         : header_content_encoding_identity,
       header_content_type,
       post_file,
       g_upload_url,
@@ -2039,6 +2046,7 @@ void InitCrashReporter(const std::string& process_type) {
 
 #if !BUILDFLAG(IS_CHROMEOS_ASH)
   SetUploadURL(GetCrashReporterClient()->GetUploadUrl());
+  g_compress_uploads = GetCrashReporterClient()->GetShouldCompressUploads();
 #endif
 
   if (is_browser_process) {
