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LibCoreDump+CrashDaemon: Compress coredumps

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Most coredumps contain large amounts of consecutive null bytes and as
such are a prime candidate for compression.

This commit makes CrashDaemon compress files once the kernel finishes
emitting them, as well as adds the functionality needed in LibCoreDump
to then parse them.
This commit is contained in:
Idan Horowitz 2021-03-26 18:46:20 +03:00 • committed by Andreas Kling
parent b8f462a78b
commit 9f656b6fa9
8 changed files with 70 additions and 15 deletions
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41
Userland/Services/CrashDaemon/main.cpp
View file

@ -25,6 +25,9 @@
*/
#include <AK/LexicalPath.h>
#include <AK/MappedFile.h>
#include <LibCompress/Gzip.h>
#include <LibCore/File.h>
#include <LibCore/FileWatcher.h>
#include <LibCoreDump/Backtrace.h>
#include <LibCoreDump/Reader.h>
@ -49,6 +52,33 @@ static void wait_until_coredump_is_ready(const String& coredump_path)
}
}
static bool compress_coredump(const String& coredump_path)
{
auto file_or_error = MappedFile::map(coredump_path);
if (file_or_error.is_error()) {
dbgln("Could not open coredump '{}': {}", coredump_path, file_or_error.error());
return false;
}
auto coredump_file = file_or_error.value();
auto compressed_coredump = Compress::GzipCompressor::compress_all(coredump_file->bytes());
if (!compressed_coredump.has_value()) {
dbgln("Could not compress coredump '{}'", coredump_path);
return false;
}
auto output_path = String::formatted("{}.gz", coredump_path);
auto output_file_or_error = Core::File::open(output_path, Core::File::WriteOnly);
if (output_file_or_error.is_error()) {
dbgln("Could not open '{}' for writing: {}", output_path, output_file_or_error.error());
return false;
}
auto output_file = output_file_or_error.value();
if (!output_file->write(compressed_coredump.value().data(), compressed_coredump.value().size())) {
dbgln("Could not write compressed coredump '{}'", output_path);
return false;
}
return true;
}
static void print_backtrace(const String& coredump_path)
{
auto coredump = CoreDump::Reader::create(coredump_path);
@ -70,10 +100,10 @@ static void print_backtrace(const String& coredump_path)
});
}
static void launch_crash_reporter(const String& coredump_path)
static void launch_crash_reporter(const String& coredump_path, bool unlink_after_use)
{
pid_t child;
const char* argv[] = { "CrashReporter", coredump_path.characters(), nullptr, nullptr };
const char* argv[] = { "CrashReporter", coredump_path.characters(), unlink_after_use ? "--unlink" : nullptr, nullptr, nullptr };
if ((errno = posix_spawn(&child, "/bin/CrashReporter", nullptr, nullptr, const_cast<char**>(argv), environ))) {
perror("posix_spawn");
} else {
@ -84,7 +114,7 @@ static void launch_crash_reporter(const String& coredump_path)
int main()
{
if (pledge("stdio rpath proc exec", nullptr) < 0) {
if (pledge("stdio rpath wpath cpath proc exec", nullptr) < 0) {
perror("pledge");
return 1;
}
@ -96,9 +126,12 @@ int main()
if (event.value().type != Core::FileWatcherEvent::Type::ChildAdded)
continue;
auto coredump_path = event.value().child_path;
if (coredump_path.ends_with(".gz"))
continue; // stops compress_coredump from accidentally triggering us
dbgln("New coredump file: {}", coredump_path);
wait_until_coredump_is_ready(coredump_path);
auto compressed = compress_coredump(coredump_path);
print_backtrace(coredump_path);
launch_crash_reporter(coredump_path);
launch_crash_reporter(coredump_path, compressed);
}
}