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/*
* Copyright (C) 2016 The Android Open Source Project
*
* 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 "command.h"
#include "print.h"
#include "util.h"
#include <errno.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/wait.h>
Command::Command(const string& prog)
:prog(prog)
{
}
Command::~Command()
{
}
void
Command::AddArg(const string& arg)
{
args.push_back(arg);
}
void
Command::AddEnv(const string& name, const string& value)
{
env[name] = value;
}
const char*
Command::GetProg() const
{
return prog.c_str();
}
char *const *
Command::GetArgv() const
{
const int N = args.size();
char** result = (char**)malloc(sizeof(char*)*(N+2));
result[0] = strdup(prog.c_str());
for (int i=0; i<N; i++) {
result[i+1] = strdup(args[i].c_str());
}
result[N+1] = 0;
return result;
}
char *const *
Command::GetEnv() const
{
map<string,string> copy;
for (const char** p=(const char**)environ; *p != NULL; p++) {
char* name = strdup(*p);
char* value = strchr(name, '=');
*value = '\0';
value++;
copy[name] = value;
free(name);
}
for (map<string,string>::const_iterator it=env.begin(); it!=env.end(); it++) {
copy[it->first] = it->second;
}
char** result = (char**)malloc(sizeof(char*)*(copy.size()+1));
char** row = result;
for (map<string,string>::const_iterator it=copy.begin(); it!=copy.end(); it++) {
*row = (char*)malloc(it->first.size() + it->second.size() + 2);
strcpy(*row, it->first.c_str());
strcat(*row, "=");
strcat(*row, it->second.c_str());
row++;
}
*row = NULL;
return result;
}
string
get_command_output(const Command& command, int* err, bool quiet)
{
if (!quiet) {
print_command(command);
}
int fds[2];
pipe(fds);
pid_t pid = fork();
if (pid == -1) {
// fork error
*err = errno;
return string();
} else if (pid == 0) {
// child
while ((dup2(fds[1], STDOUT_FILENO) == -1) && (errno == EINTR)) {}
close(fds[1]);
close(fds[0]);
const char* prog = command.GetProg();
char* const* argv = command.GetArgv();
char* const* env = command.GetEnv();
execvpe(prog, argv, env);
if (!quiet) {
print_error("Unable to run command: %s", prog);
}
exit(1);
} else {
// parent
close(fds[1]);
string result;
const int size = 16*1024;
char* buf = (char*)malloc(size);
while (true) {
ssize_t amt = read(fds[0], buf, size);
if (amt <= 0) {
break;
} else if (amt > 0) {
result.append(buf, amt);
}
}
free(buf);
int status;
waitpid(pid, &status, 0);
if (WIFEXITED(status)) {
*err = WEXITSTATUS(status);
return result;
} else {
*err = -1;
return string();
}
}
}
int
run_command(const Command& command)
{
print_command(command);
pid_t pid = fork();
if (pid == -1) {
// fork error
return errno;
} else if (pid == 0) {
// child
const char* prog = command.GetProg();
char* const* argv = command.GetArgv();
char* const* env = command.GetEnv();
execvpe(prog, argv, env);
print_error("Unable to run command: %s", prog);
exit(1);
} else {
// parent
int status;
waitpid(pid, &status, 0);
if (WIFEXITED(status)) {
return WEXITSTATUS(status);
} else {
return -1;
}
}
}
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