forked from lix-project/lix
449 lines
8.8 KiB
C++
449 lines
8.8 KiB
C++
#include "config.h"
|
|
|
|
#include <iostream>
|
|
#include <cerrno>
|
|
#include <cstdio>
|
|
#include <sstream>
|
|
|
|
#include <sys/types.h>
|
|
#include <sys/stat.h>
|
|
#include <unistd.h>
|
|
#include <dirent.h>
|
|
#include <fcntl.h>
|
|
|
|
#include "util.hh"
|
|
|
|
|
|
string thisSystem = SYSTEM;
|
|
|
|
|
|
Error::Error(const format & f)
|
|
{
|
|
err = f.str();
|
|
}
|
|
|
|
|
|
SysError::SysError(const format & f)
|
|
: Error(format("%1%: %2%") % f.str() % strerror(errno))
|
|
{
|
|
}
|
|
|
|
|
|
string getEnv(const string & key, const string & def)
|
|
{
|
|
char * value = getenv(key.c_str());
|
|
return value ? string(value) : def;
|
|
}
|
|
|
|
|
|
Path absPath(Path path, Path dir)
|
|
{
|
|
if (path[0] != '/') {
|
|
if (dir == "") {
|
|
char buf[PATH_MAX];
|
|
if (!getcwd(buf, sizeof(buf)))
|
|
throw SysError("cannot get cwd");
|
|
dir = buf;
|
|
}
|
|
path = dir + "/" + path;
|
|
}
|
|
return canonPath(path);
|
|
}
|
|
|
|
|
|
Path canonPath(const Path & path)
|
|
{
|
|
string s;
|
|
|
|
if (path[0] != '/')
|
|
throw Error(format("not an absolute path: `%1%'") % path);
|
|
|
|
string::const_iterator i = path.begin(), end = path.end();
|
|
|
|
while (1) {
|
|
|
|
/* Skip slashes. */
|
|
while (i != end && *i == '/') i++;
|
|
if (i == end) break;
|
|
|
|
/* Ignore `.'. */
|
|
if (*i == '.' && (i + 1 == end || i[1] == '/'))
|
|
i++;
|
|
|
|
/* If `..', delete the last component. */
|
|
else if (*i == '.' && i + 1 < end && i[1] == '.' &&
|
|
(i + 2 == end || i[2] == '/'))
|
|
{
|
|
if (!s.empty()) s.erase(s.rfind('/'));
|
|
i += 2;
|
|
}
|
|
|
|
/* Normal component; copy it. */
|
|
else {
|
|
s += '/';
|
|
while (i != end && *i != '/') s += *i++;
|
|
}
|
|
}
|
|
|
|
return s.empty() ? "/" : s;
|
|
}
|
|
|
|
|
|
Path dirOf(const Path & path)
|
|
{
|
|
unsigned int pos = path.rfind('/');
|
|
if (pos == string::npos)
|
|
throw Error(format("invalid file name: %1%") % path);
|
|
return Path(path, 0, pos);
|
|
}
|
|
|
|
|
|
string baseNameOf(const Path & path)
|
|
{
|
|
unsigned int pos = path.rfind('/');
|
|
if (pos == string::npos)
|
|
throw Error(format("invalid file name %1% ") % path);
|
|
return string(path, pos + 1);
|
|
}
|
|
|
|
|
|
bool pathExists(const Path & path)
|
|
{
|
|
int res;
|
|
struct stat st;
|
|
res = lstat(path.c_str(), &st);
|
|
if (!res) return true;
|
|
if (errno != ENOENT)
|
|
throw SysError(format("getting status of %1%") % path);
|
|
return false;
|
|
}
|
|
|
|
|
|
Path readLink(const Path & path)
|
|
{
|
|
struct stat st;
|
|
if (lstat(path.c_str(), &st))
|
|
throw SysError(format("getting status of `%1%'") % path);
|
|
if (!S_ISLNK(st.st_mode))
|
|
throw Error(format("`%1%' is not a symlink") % path);
|
|
char buf[st.st_size];
|
|
if (readlink(path.c_str(), buf, st.st_size) != st.st_size)
|
|
throw SysError(format("reading symbolic link `%1%'") % path);
|
|
return string(buf, st.st_size);
|
|
}
|
|
|
|
|
|
Strings readDirectory(const Path & path)
|
|
{
|
|
Strings names;
|
|
|
|
AutoCloseDir dir = opendir(path.c_str());
|
|
if (!dir) throw SysError(format("opening directory `%1%'") % path);
|
|
|
|
struct dirent * dirent;
|
|
while (errno = 0, dirent = readdir(dir)) { /* sic */
|
|
checkInterrupt();
|
|
string name = dirent->d_name;
|
|
if (name == "." || name == "..") continue;
|
|
names.push_back(name);
|
|
}
|
|
if (errno) throw SysError(format("reading directory `%1%'") % path);
|
|
|
|
return names;
|
|
}
|
|
|
|
|
|
static void _deletePath(const Path & path)
|
|
{
|
|
checkInterrupt();
|
|
|
|
printMsg(lvlVomit, format("%1%") % path);
|
|
|
|
struct stat st;
|
|
if (lstat(path.c_str(), &st))
|
|
throw SysError(format("getting attributes of path `%1%'") % path);
|
|
|
|
if (S_ISDIR(st.st_mode)) {
|
|
Strings names = readDirectory(path);
|
|
|
|
/* Make the directory writable. */
|
|
if (!(st.st_mode & S_IWUSR)) {
|
|
if (chmod(path.c_str(), st.st_mode | S_IWUSR) == -1)
|
|
throw SysError(format("making `%1%' writable"));
|
|
}
|
|
|
|
for (Strings::iterator i = names.begin(); i != names.end(); ++i)
|
|
_deletePath(path + "/" + *i);
|
|
}
|
|
|
|
if (remove(path.c_str()) == -1)
|
|
throw SysError(format("cannot unlink `%1%'") % path);
|
|
}
|
|
|
|
|
|
void deletePath(const Path & path)
|
|
{
|
|
startNest(nest, lvlDebug,
|
|
format("recursively deleting path `%1%'") % path);
|
|
_deletePath(path);
|
|
}
|
|
|
|
|
|
void makePathReadOnly(const Path & path)
|
|
{
|
|
checkInterrupt();
|
|
|
|
struct stat st;
|
|
if (lstat(path.c_str(), &st))
|
|
throw SysError(format("getting attributes of path `%1%'") % path);
|
|
|
|
if (!S_ISLNK(st.st_mode) && (st.st_mode & S_IWUSR)) {
|
|
if (chmod(path.c_str(), st.st_mode & ~S_IWUSR) == -1)
|
|
throw SysError(format("making `%1%' read-only") % path);
|
|
}
|
|
|
|
if (S_ISDIR(st.st_mode)) {
|
|
Strings names = readDirectory(path);
|
|
for (Strings::iterator i = names.begin(); i != names.end(); ++i)
|
|
makePathReadOnly(path + "/" + *i);
|
|
}
|
|
}
|
|
|
|
|
|
static Path tempName()
|
|
{
|
|
static int counter = 0;
|
|
Path tmpRoot = canonPath(getEnv("TMPDIR", "/tmp"));
|
|
return (format("%1%/nix-%2%-%3%") % tmpRoot % getpid() % counter++).str();
|
|
}
|
|
|
|
|
|
Path createTempDir()
|
|
{
|
|
while (1) {
|
|
checkInterrupt();
|
|
Path tmpDir = tempName();
|
|
if (mkdir(tmpDir.c_str(), 0777) == 0) return tmpDir;
|
|
if (errno != EEXIST)
|
|
throw SysError(format("creating directory `%1%'") % tmpDir);
|
|
}
|
|
}
|
|
|
|
|
|
void writeStringToFile(const Path & path, const string & s)
|
|
{
|
|
AutoCloseFD fd = open(path.c_str(),
|
|
O_CREAT | O_EXCL | O_WRONLY, 0666);
|
|
if (fd == -1)
|
|
throw SysError(format("creating file `%1%'") % path);
|
|
writeFull(fd, (unsigned char *) s.c_str(), s.size());
|
|
}
|
|
|
|
|
|
LogType logType = ltPretty;
|
|
Verbosity verbosity = lvlError;
|
|
|
|
static int nestingLevel = 0;
|
|
|
|
|
|
Nest::Nest()
|
|
{
|
|
nest = false;
|
|
}
|
|
|
|
|
|
Nest::~Nest()
|
|
{
|
|
close();
|
|
}
|
|
|
|
|
|
static string escVerbosity(Verbosity level)
|
|
{
|
|
int l = (int) level;
|
|
ostringstream st;
|
|
st << l;
|
|
return st.str();
|
|
}
|
|
|
|
|
|
void Nest::open(Verbosity level, const format & f)
|
|
{
|
|
if (level <= verbosity) {
|
|
if (logType == ltEscapes)
|
|
cerr << "\033[" << escVerbosity(level) << "p"
|
|
<< f.str() << "\n";
|
|
else
|
|
printMsg_(level, f);
|
|
nest = true;
|
|
nestingLevel++;
|
|
}
|
|
}
|
|
|
|
|
|
void Nest::close()
|
|
{
|
|
if (nest) {
|
|
nestingLevel--;
|
|
if (logType == ltEscapes)
|
|
cerr << "\033[q";
|
|
nest = false;
|
|
}
|
|
}
|
|
|
|
|
|
void printMsg_(Verbosity level, const format & f)
|
|
{
|
|
checkInterrupt();
|
|
if (level > verbosity) return;
|
|
string prefix;
|
|
if (logType == ltPretty)
|
|
for (int i = 0; i < nestingLevel; i++)
|
|
prefix += "| ";
|
|
else if (logType == ltEscapes && level != lvlInfo)
|
|
prefix = "\033[" + escVerbosity(level) + "s";
|
|
cerr << format("%1%%2%\n") % prefix % f.str();
|
|
}
|
|
|
|
|
|
void readFull(int fd, unsigned char * buf, size_t count)
|
|
{
|
|
while (count) {
|
|
checkInterrupt();
|
|
ssize_t res = read(fd, (char *) buf, count);
|
|
if (res == -1) {
|
|
if (errno == EINTR) continue;
|
|
throw SysError("reading from file");
|
|
}
|
|
if (res == 0) throw Error("unexpected end-of-file");
|
|
count -= res;
|
|
buf += res;
|
|
}
|
|
}
|
|
|
|
|
|
void writeFull(int fd, const unsigned char * buf, size_t count)
|
|
{
|
|
while (count) {
|
|
checkInterrupt();
|
|
ssize_t res = write(fd, (char *) buf, count);
|
|
if (res == -1) {
|
|
if (errno == EINTR) continue;
|
|
throw SysError("writing to file");
|
|
}
|
|
count -= res;
|
|
buf += res;
|
|
}
|
|
}
|
|
|
|
|
|
AutoDelete::AutoDelete(const string & p) : path(p)
|
|
{
|
|
del = true;
|
|
}
|
|
|
|
AutoDelete::~AutoDelete()
|
|
{
|
|
if (del) deletePath(path);
|
|
}
|
|
|
|
void AutoDelete::cancel()
|
|
{
|
|
del = false;
|
|
}
|
|
|
|
|
|
AutoCloseFD::AutoCloseFD()
|
|
{
|
|
fd = -1;
|
|
}
|
|
|
|
AutoCloseFD::AutoCloseFD(int fd)
|
|
{
|
|
this->fd = fd;
|
|
}
|
|
|
|
AutoCloseFD::~AutoCloseFD()
|
|
{
|
|
try {
|
|
close();
|
|
} catch (Error & e) {
|
|
printMsg(lvlError, format("error (ignored): %1%") % e.msg());
|
|
}
|
|
}
|
|
|
|
void AutoCloseFD::operator =(int fd)
|
|
{
|
|
if (this->fd != fd) close();
|
|
this->fd = fd;
|
|
}
|
|
|
|
AutoCloseFD::operator int()
|
|
{
|
|
return fd;
|
|
}
|
|
|
|
void AutoCloseFD::close()
|
|
{
|
|
if (fd != -1) {
|
|
if (::close(fd) == -1)
|
|
/* This should never happen. */
|
|
throw SysError("closing file descriptor");
|
|
fd = -1;
|
|
}
|
|
}
|
|
|
|
bool AutoCloseFD::isOpen()
|
|
{
|
|
return fd != -1;
|
|
}
|
|
|
|
|
|
void Pipe::create()
|
|
{
|
|
int fds[2];
|
|
if (pipe(fds) != 0) throw SysError("creating pipe");
|
|
readSide = fds[0];
|
|
writeSide = fds[1];
|
|
}
|
|
|
|
|
|
AutoCloseDir::AutoCloseDir()
|
|
{
|
|
dir = 0;
|
|
}
|
|
|
|
AutoCloseDir::AutoCloseDir(DIR * dir)
|
|
{
|
|
this->dir = dir;
|
|
}
|
|
|
|
AutoCloseDir::~AutoCloseDir()
|
|
{
|
|
if (dir) closedir(dir);
|
|
}
|
|
|
|
void AutoCloseDir::operator =(DIR * dir)
|
|
{
|
|
this->dir = dir;
|
|
}
|
|
|
|
AutoCloseDir::operator DIR *()
|
|
{
|
|
return dir;
|
|
}
|
|
|
|
|
|
volatile sig_atomic_t _isInterrupted = 0;
|
|
|
|
void _interrupted()
|
|
{
|
|
/* Block user interrupts while an exception is being handled.
|
|
Throwing an exception while another exception is being handled
|
|
kills the program! */
|
|
if (!uncaught_exception()) {
|
|
_isInterrupted = 0;
|
|
throw Error("interrupted by the user");
|
|
}
|
|
}
|