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// Copyright 2011 Google Inc. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "build_log.h"
#include <errno.h>
#include <stdio.h>
#include <string.h>
#include "build.h"
#include "graph.h"
#include "ninja.h"
// Implementation details:
// Each run's log appends to the log file.
// To load, we run through all log entries in series, throwing away
// older runs.
// Once the number of redundant entries exceeds a threshold, we write
// out a new file and replace the existing one with it.
namespace {
const char kFileSignature[] = "# ninja log v2\n";
const int kCurrentVersion = 2;
}
BuildLog::BuildLog()
: log_file_(NULL), config_(NULL), needs_recompaction_(false) {}
bool BuildLog::OpenForWrite(const string& path, string* err) {
if (config_ && config_->dry_run)
return true; // Do nothing, report success.
if (needs_recompaction_) {
Close();
if (!Recompact(path, err))
return false;
}
log_file_ = fopen(path.c_str(), "ab");
if (!log_file_) {
*err = strerror(errno);
return false;
}
setvbuf(log_file_, NULL, _IOLBF, 0);
if (ftell(log_file_) == 0) {
if (fwrite(kFileSignature, sizeof(kFileSignature) - 1, 1, log_file_) < 1) {
*err = strerror(errno);
return false;
}
}
return true;
}
void BuildLog::RecordCommand(Edge* edge, int start_time, int end_time) {
if (!log_file_)
return;
const string command = edge->EvaluateCommand();
for (vector<Node*>::iterator out = edge->outputs_.begin();
out != edge->outputs_.end(); ++out) {
const string& path = (*out)->file_->path_;
Log::iterator i = log_.find(path);
LogEntry* log_entry;
if (i != log_.end()) {
log_entry = i->second;
} else {
log_entry = new LogEntry;
log_.insert(make_pair(path, log_entry));
}
log_entry->output = path;
log_entry->command = command;
log_entry->start_time = start_time;
log_entry->end_time = end_time;
WriteEntry(log_file_, *log_entry);
}
}
void BuildLog::Close() {
if (log_file_)
fclose(log_file_);
log_file_ = NULL;
}
bool BuildLog::Load(const string& path, string* err) {
FILE* file = fopen(path.c_str(), "r");
if (!file) {
if (errno == ENOENT)
return true;
*err = strerror(errno);
return false;
}
int log_version = 0;
int unique_entry_count = 0;
int total_entry_count = 0;
char buf[256 << 10];
while (fgets(buf, sizeof(buf), file)) {
if (!log_version) {
log_version = 1; // Assume by default.
if (strcmp(buf, kFileSignature) == 0) {
log_version = 2;
continue;
}
}
char* start = buf;
char* end = strchr(start, ' ');
if (!end)
continue;
*end = 0;
int start_time = 0, end_time = 0;
if (log_version == 1) {
// In v1 we logged how long the command took; we don't use this info.
// int time_ms = atoi(start);
start = end + 1;
} else {
// In v2 we log the start time and the end time.
start_time = atoi(start);
start = end + 1;
char* end = strchr(start, ' ');
if (!end)
continue;
*end = 0;
end_time = atoi(start);
start = end + 1;
}
end = strchr(start, ' ');
if (!end)
continue;
string output = string(start, end - start);
start = end + 1;
end = strchr(start, '\n');
if (!end)
continue;
LogEntry* entry;
Log::iterator i = log_.find(output);
if (i != log_.end()) {
entry = i->second;
} else {
entry = new LogEntry;
log_.insert(make_pair(output, entry));
++unique_entry_count;
}
++total_entry_count;
entry->output = output;
entry->start_time = start_time;
entry->end_time = end_time;
entry->command = string(start, end - start);
}
// Mark the log as "needs rebuiding" if it has kCompactionRatio times
// too many log entries or it's the wrong version.
int kCompactionRatio = 3;
if (total_entry_count > unique_entry_count * kCompactionRatio ||
log_version < kCurrentVersion) {
needs_recompaction_ = true;
}
fclose(file);
return true;
}
BuildLog::LogEntry* BuildLog::LookupByOutput(const string& path) {
Log::iterator i = log_.find(path);
if (i != log_.end())
return i->second;
return NULL;
}
void BuildLog::WriteEntry(FILE* f, const LogEntry& entry) {
fprintf(f, "%d %d %s %s\n",
entry.start_time, entry.end_time,
entry.output.c_str(), entry.command.c_str());
}
bool BuildLog::Recompact(const string& path, string* err) {
printf("Recompacting log...\n");
string temp_path = path + ".recompact";
FILE* f = fopen(temp_path.c_str(), "wb");
if (!f) {
*err = strerror(errno);
return false;
}
if (fwrite(kFileSignature, sizeof(kFileSignature) - 1, 1, log_file_) < 1) {
*err = strerror(errno);
return false;
}
for (Log::iterator i = log_.begin(); i != log_.end(); ++i) {
WriteEntry(f, *i->second);
}
fclose(f);
if (unlink(path.c_str()) < 0) {
*err = strerror(errno);
return false;
}
if (rename(temp_path.c_str(), path.c_str()) < 0) {
*err = strerror(errno);
return false;
}
return true;
}
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