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-rw-r--r--src/libutil/util.cc1916
1 files changed, 0 insertions, 1916 deletions
diff --git a/src/libutil/util.cc b/src/libutil/util.cc
deleted file mode 100644
index 2c0fcc897..000000000
--- a/src/libutil/util.cc
+++ /dev/null
@@ -1,1916 +0,0 @@
-#include "util.hh"
-#include "sync.hh"
-#include "finally.hh"
-#include "serialise.hh"
-#include "cgroup.hh"
-#include "signals.hh"
-
-#include <array>
-#include <cctype>
-#include <cerrno>
-#include <climits>
-#include <cstdio>
-#include <cstdlib>
-#include <cstring>
-#include <future>
-#include <iostream>
-#include <mutex>
-#include <sstream>
-#include <thread>
-
-#include <fcntl.h>
-#include <grp.h>
-#include <pwd.h>
-#include <sys/ioctl.h>
-#include <sys/types.h>
-#include <sys/socket.h>
-#include <sys/wait.h>
-#include <sys/time.h>
-#include <sys/un.h>
-#include <unistd.h>
-
-#ifdef __APPLE__
-#include <sys/syscall.h>
-#include <mach-o/dyld.h>
-#endif
-
-#ifdef __linux__
-#include <sys/prctl.h>
-#include <sys/resource.h>
-#include <sys/mman.h>
-
-#include <cmath>
-#endif
-
-
-extern char * * environ __attribute__((weak));
-
-
-#ifdef NDEBUG
-#error "Lix may not be built with assertions disabled (i.e. with -DNDEBUG)."
-#endif
-
-namespace nix {
-
-std::optional<std::string> getEnv(const std::string & key)
-{
- char * value = getenv(key.c_str());
- if (!value) return {};
- return std::string(value);
-}
-
-std::optional<std::string> getEnvNonEmpty(const std::string & key) {
- auto value = getEnv(key);
- if (value == "") return {};
- return value;
-}
-
-std::map<std::string, std::string> getEnv()
-{
- std::map<std::string, std::string> env;
- for (size_t i = 0; environ[i]; ++i) {
- auto s = environ[i];
- auto eq = strchr(s, '=');
- if (!eq)
- // invalid env, just keep going
- continue;
- env.emplace(std::string(s, eq), std::string(eq + 1));
- }
- return env;
-}
-
-
-void clearEnv()
-{
- for (auto & name : getEnv())
- unsetenv(name.first.c_str());
-}
-
-void replaceEnv(const std::map<std::string, std::string> & newEnv)
-{
- clearEnv();
- for (auto & newEnvVar : newEnv)
- setenv(newEnvVar.first.c_str(), newEnvVar.second.c_str(), 1);
-}
-
-
-Path absPath(Path path, std::optional<PathView> dir, bool resolveSymlinks)
-{
- if (path.empty() || path[0] != '/') {
- if (!dir) {
-#ifdef __GNU__
- /* GNU (aka. GNU/Hurd) doesn't have any limitation on path
- lengths and doesn't define `PATH_MAX'. */
- char *buf = getcwd(NULL, 0);
- if (buf == NULL)
-#else
- char buf[PATH_MAX];
- if (!getcwd(buf, sizeof(buf)))
-#endif
- throw SysError("cannot get cwd");
- path = concatStrings(buf, "/", path);
-#ifdef __GNU__
- free(buf);
-#endif
- } else
- path = concatStrings(*dir, "/", path);
- }
- return canonPath(path, resolveSymlinks);
-}
-
-
-Path canonPath(PathView path, bool resolveSymlinks)
-{
- assert(path != "");
-
- std::string s;
- s.reserve(256);
-
- if (path[0] != '/')
- throw Error("not an absolute path: '%1%'", path);
-
- std::string temp;
-
- /* Count the number of times we follow a symlink and stop at some
- arbitrary (but high) limit to prevent infinite loops. */
- unsigned int followCount = 0, maxFollow = 1024;
-
- while (1) {
-
- /* Skip slashes. */
- while (!path.empty() && path[0] == '/') path.remove_prefix(1);
- if (path.empty()) break;
-
- /* Ignore `.'. */
- if (path == "." || path.substr(0, 2) == "./")
- path.remove_prefix(1);
-
- /* If `..', delete the last component. */
- else if (path == ".." || path.substr(0, 3) == "../")
- {
- if (!s.empty()) s.erase(s.rfind('/'));
- path.remove_prefix(2);
- }
-
- /* Normal component; copy it. */
- else {
- s += '/';
- if (const auto slash = path.find('/'); slash == std::string::npos) {
- s += path;
- path = {};
- } else {
- s += path.substr(0, slash);
- path = path.substr(slash);
- }
-
- /* If s points to a symlink, resolve it and continue from there */
- if (resolveSymlinks && isLink(s)) {
- if (++followCount >= maxFollow)
- throw Error("infinite symlink recursion in path '%1%'", path);
- temp = concatStrings(readLink(s), path);
- path = temp;
- if (!temp.empty() && temp[0] == '/') {
- s.clear(); /* restart for symlinks pointing to absolute path */
- } else {
- s = dirOf(s);
- if (s == "/") { // we don’t want trailing slashes here, which dirOf only produces if s = /
- s.clear();
- }
- }
- }
- }
- }
-
- return s.empty() ? "/" : std::move(s);
-}
-
-void chmodPath(const Path & path, mode_t mode)
-{
- if (chmod(path.c_str(), mode) == -1)
- throw SysError("setting permissions on '%s'", path);
-}
-
-Path dirOf(const PathView path)
-{
- Path::size_type pos = path.rfind('/');
- if (pos == std::string::npos)
- return ".";
- return pos == 0 ? "/" : Path(path, 0, pos);
-}
-
-
-std::string_view baseNameOf(std::string_view path)
-{
- if (path.empty())
- return "";
-
- auto last = path.size() - 1;
- if (path[last] == '/' && last > 0)
- last -= 1;
-
- auto pos = path.rfind('/', last);
- if (pos == std::string::npos)
- pos = 0;
- else
- pos += 1;
-
- return path.substr(pos, last - pos + 1);
-}
-
-
-std::string expandTilde(std::string_view path)
-{
- // TODO: expand ~user ?
- auto tilde = path.substr(0, 2);
- if (tilde == "~/" || tilde == "~")
- return getHome() + std::string(path.substr(1));
- else
- return std::string(path);
-}
-
-
-bool isInDir(std::string_view path, std::string_view dir)
-{
- return path.substr(0, 1) == "/"
- && path.substr(0, dir.size()) == dir
- && path.size() >= dir.size() + 2
- && path[dir.size()] == '/';
-}
-
-
-bool isDirOrInDir(std::string_view path, std::string_view dir)
-{
- return path == dir || isInDir(path, dir);
-}
-
-
-struct stat stat(const Path & path)
-{
- struct stat st;
- if (stat(path.c_str(), &st))
- throw SysError("getting status of '%1%'", path);
- return st;
-}
-
-
-struct stat lstat(const Path & path)
-{
- struct stat st;
- if (lstat(path.c_str(), &st))
- throw SysError("getting status of '%1%'", path);
- return st;
-}
-
-std::optional<struct stat> maybeLstat(const Path & path)
-{
- std::optional<struct stat> st{std::in_place};
- if (lstat(path.c_str(), &*st))
- {
- if (errno == ENOENT || errno == ENOTDIR)
- st.reset();
- else
- throw SysError("getting status of '%s'", path);
- }
- return st;
-}
-
-bool pathExists(const Path & path)
-{
- return maybeLstat(path).has_value();
-}
-
-bool pathAccessible(const Path & path)
-{
- try {
- return pathExists(path);
- } catch (SysError & e) {
- // swallow EPERM
- if (e.errNo == EPERM) return false;
- throw;
- }
-}
-
-
-Path readLink(const Path & path)
-{
- checkInterrupt();
- std::vector<char> buf;
- for (ssize_t bufSize = PATH_MAX/4; true; bufSize += bufSize/2) {
- buf.resize(bufSize);
- ssize_t rlSize = readlink(path.c_str(), buf.data(), bufSize);
- if (rlSize == -1)
- if (errno == EINVAL)
- throw Error("'%1%' is not a symlink", path);
- else
- throw SysError("reading symbolic link '%1%'", path);
- else if (rlSize < bufSize)
- return std::string(buf.data(), rlSize);
- }
-}
-
-
-bool isLink(const Path & path)
-{
- struct stat st = lstat(path);
- return S_ISLNK(st.st_mode);
-}
-
-
-DirEntries readDirectory(DIR *dir, const Path & path)
-{
- DirEntries entries;
- entries.reserve(64);
-
- struct dirent * dirent;
- while (errno = 0, dirent = readdir(dir)) { /* sic */
- checkInterrupt();
- std::string name = dirent->d_name;
- if (name == "." || name == "..") continue;
- entries.emplace_back(name, dirent->d_ino,
-#ifdef HAVE_STRUCT_DIRENT_D_TYPE
- dirent->d_type
-#else
- DT_UNKNOWN
-#endif
- );
- }
- if (errno) throw SysError("reading directory '%1%'", path);
-
- return entries;
-}
-
-DirEntries readDirectory(const Path & path)
-{
- AutoCloseDir dir(opendir(path.c_str()));
- if (!dir) throw SysError("opening directory '%1%'", path);
-
- return readDirectory(dir.get(), path);
-}
-
-
-unsigned char getFileType(const Path & path)
-{
- struct stat st = lstat(path);
- if (S_ISDIR(st.st_mode)) return DT_DIR;
- if (S_ISLNK(st.st_mode)) return DT_LNK;
- if (S_ISREG(st.st_mode)) return DT_REG;
- return DT_UNKNOWN;
-}
-
-
-std::string readFile(int fd)
-{
- struct stat st;
- if (fstat(fd, &st) == -1)
- throw SysError("statting file");
-
- return drainFD(fd, true, st.st_size);
-}
-
-
-std::string readFile(const Path & path)
-{
- AutoCloseFD fd{open(path.c_str(), O_RDONLY | O_CLOEXEC)};
- if (!fd)
- throw SysError("opening file '%1%'", path);
- return readFile(fd.get());
-}
-
-
-void readFile(const Path & path, Sink & sink)
-{
- AutoCloseFD fd{open(path.c_str(), O_RDONLY | O_CLOEXEC)};
- if (!fd)
- throw SysError("opening file '%s'", path);
- drainFD(fd.get(), sink);
-}
-
-
-void writeFile(const Path & path, std::string_view s, mode_t mode, bool sync)
-{
- AutoCloseFD fd{open(path.c_str(), O_WRONLY | O_TRUNC | O_CREAT | O_CLOEXEC, mode)};
- if (!fd)
- throw SysError("opening file '%1%'", path);
- try {
- writeFull(fd.get(), s);
- } catch (Error & e) {
- e.addTrace({}, "writing file '%1%'", path);
- throw;
- }
- if (sync)
- fd.fsync();
- // Explicitly close to make sure exceptions are propagated.
- fd.close();
- if (sync)
- syncParent(path);
-}
-
-
-void writeFile(const Path & path, Source & source, mode_t mode, bool sync)
-{
- AutoCloseFD fd{open(path.c_str(), O_WRONLY | O_TRUNC | O_CREAT | O_CLOEXEC, mode)};
- if (!fd)
- throw SysError("opening file '%1%'", path);
-
- std::vector<char> buf(64 * 1024);
-
- try {
- while (true) {
- try {
- auto n = source.read(buf.data(), buf.size());
- writeFull(fd.get(), {buf.data(), n});
- } catch (EndOfFile &) { break; }
- }
- } catch (Error & e) {
- e.addTrace({}, "writing file '%1%'", path);
- throw;
- }
- if (sync)
- fd.fsync();
- // Explicitly close to make sure exceptions are propagated.
- fd.close();
- if (sync)
- syncParent(path);
-}
-
-void syncParent(const Path & path)
-{
- AutoCloseFD fd{open(dirOf(path).c_str(), O_RDONLY, 0)};
- if (!fd)
- throw SysError("opening file '%1%'", path);
- fd.fsync();
-}
-
-std::string readLine(int fd)
-{
- std::string s;
- while (1) {
- checkInterrupt();
- char ch;
- // FIXME: inefficient
- ssize_t rd = read(fd, &ch, 1);
- if (rd == -1) {
- if (errno != EINTR)
- throw SysError("reading a line");
- } else if (rd == 0)
- throw EndOfFile("unexpected EOF reading a line");
- else {
- if (ch == '\n') return s;
- s += ch;
- }
- }
-}
-
-
-void writeLine(int fd, std::string s)
-{
- s += '\n';
- writeFull(fd, s);
-}
-
-
-static void _deletePath(int parentfd, const Path & path, uint64_t & bytesFreed)
-{
- checkInterrupt();
-
- std::string name(baseNameOf(path));
-
- struct stat st;
- if (fstatat(parentfd, name.c_str(), &st, AT_SYMLINK_NOFOLLOW) == -1) {
- if (errno == ENOENT) return;
- throw SysError("getting status of '%1%'", path);
- }
-
- if (!S_ISDIR(st.st_mode)) {
- /* We are about to delete a file. Will it likely free space? */
-
- switch (st.st_nlink) {
- /* Yes: last link. */
- case 1:
- bytesFreed += st.st_size;
- break;
- /* Maybe: yes, if 'auto-optimise-store' or manual optimisation
- was performed. Instead of checking for real let's assume
- it's an optimised file and space will be freed.
-
- In worst case we will double count on freed space for files
- with exactly two hardlinks for unoptimised packages.
- */
- case 2:
- bytesFreed += st.st_size;
- break;
- /* No: 3+ links. */
- default:
- break;
- }
- }
-
- if (S_ISDIR(st.st_mode)) {
- /* Make the directory accessible. */
- const auto PERM_MASK = S_IRUSR | S_IWUSR | S_IXUSR;
- if ((st.st_mode & PERM_MASK) != PERM_MASK) {
- if (fchmodat(parentfd, name.c_str(), st.st_mode | PERM_MASK, 0) == -1)
- throw SysError("chmod '%1%'", path);
- }
-
- int fd = openat(parentfd, path.c_str(), O_RDONLY);
- if (fd == -1)
- throw SysError("opening directory '%1%'", path);
- AutoCloseDir dir(fdopendir(fd));
- if (!dir)
- throw SysError("opening directory '%1%'", path);
- for (auto & i : readDirectory(dir.get(), path))
- _deletePath(dirfd(dir.get()), path + "/" + i.name, bytesFreed);
- }
-
- int flags = S_ISDIR(st.st_mode) ? AT_REMOVEDIR : 0;
- if (unlinkat(parentfd, name.c_str(), flags) == -1) {
- if (errno == ENOENT) return;
- throw SysError("cannot unlink '%1%'", path);
- }
-}
-
-static void _deletePath(const Path & path, uint64_t & bytesFreed)
-{
- Path dir = dirOf(path);
- if (dir == "")
- dir = "/";
-
- AutoCloseFD dirfd{open(dir.c_str(), O_RDONLY)};
- if (!dirfd) {
- if (errno == ENOENT) return;
- throw SysError("opening directory '%1%'", path);
- }
-
- _deletePath(dirfd.get(), path, bytesFreed);
-}
-
-
-void deletePath(const Path & path)
-{
- uint64_t dummy;
- deletePath(path, dummy);
-}
-
-
-void deletePath(const Path & path, uint64_t & bytesFreed)
-{
- //Activity act(*logger, lvlDebug, "recursively deleting path '%1%'", path);
- bytesFreed = 0;
- _deletePath(path, bytesFreed);
-}
-
-
-std::string getUserName()
-{
- auto pw = getpwuid(geteuid());
- std::string name = pw ? pw->pw_name : getEnv("USER").value_or("");
- if (name.empty())
- throw Error("cannot figure out user name");
- return name;
-}
-
-Path getHomeOf(uid_t userId)
-{
- std::vector<char> buf(16384);
- struct passwd pwbuf;
- struct passwd * pw;
- if (getpwuid_r(userId, &pwbuf, buf.data(), buf.size(), &pw) != 0
- || !pw || !pw->pw_dir || !pw->pw_dir[0])
- throw Error("cannot determine user's home directory");
- return pw->pw_dir;
-}
-
-Path getHome()
-{
- static Path homeDir = []()
- {
- std::optional<std::string> unownedUserHomeDir = {};
- auto homeDir = getEnv("HOME");
- if (homeDir) {
- // Only use $HOME if doesn't exist or is owned by the current user.
- struct stat st;
- int result = stat(homeDir->c_str(), &st);
- if (result != 0) {
- if (errno != ENOENT) {
- warn("couldn't stat $HOME ('%s') for reason other than not existing ('%d'), falling back to the one defined in the 'passwd' file", *homeDir, errno);
- homeDir.reset();
- }
- } else if (st.st_uid != geteuid()) {
- unownedUserHomeDir.swap(homeDir);
- }
- }
- if (!homeDir) {
- homeDir = getHomeOf(geteuid());
- if (unownedUserHomeDir.has_value() && unownedUserHomeDir != homeDir) {
- warn("$HOME ('%s') is not owned by you, falling back to the one defined in the 'passwd' file ('%s')", *unownedUserHomeDir, *homeDir);
- }
- }
- return *homeDir;
- }();
- return homeDir;
-}
-
-
-Path getCacheDir()
-{
- auto cacheDir = getEnv("XDG_CACHE_HOME");
- return cacheDir ? *cacheDir : getHome() + "/.cache";
-}
-
-
-Path getConfigDir()
-{
- auto configDir = getEnv("XDG_CONFIG_HOME");
- return configDir ? *configDir : getHome() + "/.config";
-}
-
-std::vector<Path> getConfigDirs()
-{
- Path configHome = getConfigDir();
- auto configDirs = getEnv("XDG_CONFIG_DIRS").value_or("/etc/xdg");
- std::vector<Path> result = tokenizeString<std::vector<std::string>>(configDirs, ":");
- result.insert(result.begin(), configHome);
- return result;
-}
-
-
-Path getDataDir()
-{
- auto dataDir = getEnv("XDG_DATA_HOME");
- return dataDir ? *dataDir : getHome() + "/.local/share";
-}
-
-Path getStateDir()
-{
- auto stateDir = getEnv("XDG_STATE_HOME");
- return stateDir ? *stateDir : getHome() + "/.local/state";
-}
-
-Path createNixStateDir()
-{
- Path dir = getStateDir() + "/nix";
- createDirs(dir);
- return dir;
-}
-
-
-std::optional<Path> getSelfExe()
-{
- static auto cached = []() -> std::optional<Path>
- {
- #if __linux__
- return readLink("/proc/self/exe");
- #elif __APPLE__
- char buf[1024];
- uint32_t size = sizeof(buf);
- if (_NSGetExecutablePath(buf, &size) == 0)
- return buf;
- else
- return std::nullopt;
- #else
- return std::nullopt;
- #endif
- }();
- return cached;
-}
-
-
-Paths createDirs(const Path & path)
-{
- Paths created;
- if (path == "/") return created;
-
- struct stat st;
- if (lstat(path.c_str(), &st) == -1) {
- created = createDirs(dirOf(path));
- if (mkdir(path.c_str(), 0777) == -1 && errno != EEXIST)
- throw SysError("creating directory '%1%'", path);
- st = lstat(path);
- created.push_back(path);
- }
-
- if (S_ISLNK(st.st_mode) && stat(path.c_str(), &st) == -1)
- throw SysError("statting symlink '%1%'", path);
-
- if (!S_ISDIR(st.st_mode)) throw Error("'%1%' is not a directory", path);
-
- return created;
-}
-
-
-void readFull(int fd, char * buf, size_t count)
-{
- while (count) {
- checkInterrupt();
- ssize_t res = read(fd, buf, count);
- if (res == -1) {
- if (errno == EINTR) continue;
- throw SysError("reading from file");
- }
- if (res == 0) throw EndOfFile("unexpected end-of-file");
- count -= res;
- buf += res;
- }
-}
-
-
-void writeFull(int fd, std::string_view s, bool allowInterrupts)
-{
- while (!s.empty()) {
- if (allowInterrupts) checkInterrupt();
- ssize_t res = write(fd, s.data(), s.size());
- if (res == -1 && errno != EINTR)
- throw SysError("writing to file");
- if (res > 0)
- s.remove_prefix(res);
- }
-}
-
-
-std::string drainFD(int fd, bool block, const size_t reserveSize)
-{
- // the parser needs two extra bytes to append terminating characters, other users will
- // not care very much about the extra memory.
- StringSink sink(reserveSize + 2);
- drainFD(fd, sink, block);
- return std::move(sink.s);
-}
-
-
-void drainFD(int fd, Sink & sink, bool block)
-{
- // silence GCC maybe-uninitialized warning in finally
- int saved = 0;
-
- if (!block) {
- saved = fcntl(fd, F_GETFL);
- if (fcntl(fd, F_SETFL, saved | O_NONBLOCK) == -1)
- throw SysError("making file descriptor non-blocking");
- }
-
- Finally finally([&]() {
- if (!block) {
- if (fcntl(fd, F_SETFL, saved) == -1)
- throw SysError("making file descriptor blocking");
- }
- });
-
- std::array<unsigned char, 64 * 1024> buf;
- while (1) {
- checkInterrupt();
- ssize_t rd = read(fd, buf.data(), buf.size());
- if (rd == -1) {
- if (!block && (errno == EAGAIN || errno == EWOULDBLOCK))
- break;
- if (errno != EINTR)
- throw SysError("reading from file");
- }
- else if (rd == 0) break;
- else sink({(char *) buf.data(), (size_t) rd});
- }
-}
-
-//////////////////////////////////////////////////////////////////////
-
-unsigned int getMaxCPU()
-{
- #if __linux__
- try {
- auto cgroupFS = getCgroupFS();
- if (!cgroupFS) return 0;
-
- auto cgroups = getCgroups("/proc/self/cgroup");
- auto cgroup = cgroups[""];
- if (cgroup == "") return 0;
-
- auto cpuFile = *cgroupFS + "/" + cgroup + "/cpu.max";
-
- auto cpuMax = readFile(cpuFile);
- auto cpuMaxParts = tokenizeString<std::vector<std::string>>(cpuMax, " \n");
-
- if (cpuMaxParts.size() != 2) {
- return 0;
- }
-
- auto quota = cpuMaxParts[0];
- auto period = cpuMaxParts[1];
- if (quota != "max")
- return std::ceil(std::stoi(quota) / std::stof(period));
- } catch (Error &) { ignoreException(lvlDebug); }
- #endif
-
- return 0;
-}
-
-//////////////////////////////////////////////////////////////////////
-
-
-AutoDelete::AutoDelete() : del{false} {}
-
-AutoDelete::AutoDelete(const std::string & p, bool recursive) : path(p)
-{
- del = true;
- this->recursive = recursive;
-}
-
-AutoDelete::~AutoDelete()
-{
- try {
- if (del) {
- if (recursive)
- deletePath(path);
- else {
- if (remove(path.c_str()) == -1)
- throw SysError("cannot unlink '%1%'", path);
- }
- }
- } catch (...) {
- ignoreException();
- }
-}
-
-void AutoDelete::cancel()
-{
- del = false;
-}
-
-void AutoDelete::reset(const Path & p, bool recursive) {
- path = p;
- this->recursive = recursive;
- del = true;
-}
-
-
-
-//////////////////////////////////////////////////////////////////////
-
-
-AutoCloseFD::AutoCloseFD() : fd{-1} {}
-
-
-AutoCloseFD::AutoCloseFD(int fd) : fd{fd} {}
-
-
-AutoCloseFD::AutoCloseFD(AutoCloseFD && that) : fd{that.fd}
-{
- that.fd = -1;
-}
-
-
-AutoCloseFD & AutoCloseFD::operator =(AutoCloseFD && that)
-{
- close();
- fd = that.fd;
- that.fd = -1;
- return *this;
-}
-
-
-AutoCloseFD::~AutoCloseFD()
-{
- try {
- close();
- } catch (...) {
- ignoreException();
- }
-}
-
-
-int AutoCloseFD::get() const
-{
- return fd;
-}
-
-
-void AutoCloseFD::close()
-{
- if (fd != -1) {
- if (::close(fd) == -1)
- /* This should never happen. */
- throw SysError("closing file descriptor %1%", fd);
- fd = -1;
- }
-}
-
-void AutoCloseFD::fsync()
-{
- if (fd != -1) {
- int result;
-#if __APPLE__
- result = ::fcntl(fd, F_FULLFSYNC);
-#else
- result = ::fsync(fd);
-#endif
- if (result == -1)
- throw SysError("fsync file descriptor %1%", fd);
- }
-}
-
-
-AutoCloseFD::operator bool() const
-{
- return fd != -1;
-}
-
-
-int AutoCloseFD::release()
-{
- int oldFD = fd;
- fd = -1;
- return oldFD;
-}
-
-
-void Pipe::create()
-{
- int fds[2];
-#if HAVE_PIPE2
- if (pipe2(fds, O_CLOEXEC) != 0) throw SysError("creating pipe");
-#else
- if (pipe(fds) != 0) throw SysError("creating pipe");
- closeOnExec(fds[0]);
- closeOnExec(fds[1]);
-#endif
- readSide = AutoCloseFD{fds[0]};
- writeSide = AutoCloseFD{fds[1]};
-}
-
-
-void Pipe::close()
-{
- readSide.close();
- writeSide.close();
-}
-
-
-//////////////////////////////////////////////////////////////////////
-
-
-Pid::Pid()
-{
-}
-
-
-Pid::Pid(pid_t pid)
- : pid(pid)
-{
-}
-
-
-Pid::~Pid() noexcept(false)
-{
- if (pid != -1) kill();
-}
-
-
-void Pid::operator =(pid_t pid)
-{
- if (this->pid != -1 && this->pid != pid) kill();
- this->pid = pid;
- killSignal = SIGKILL; // reset signal to default
-}
-
-
-Pid::operator pid_t()
-{
- return pid;
-}
-
-
-int Pid::kill()
-{
- assert(pid != -1);
-
- debug("killing process %1%", pid);
-
- /* Send the requested signal to the child. If it has its own
- process group, send the signal to every process in the child
- process group (which hopefully includes *all* its children). */
- if (::kill(separatePG ? -pid : pid, killSignal) != 0) {
- /* On BSDs, killing a process group will return EPERM if all
- processes in the group are zombies (or something like
- that). So try to detect and ignore that situation. */
-#if __FreeBSD__ || __APPLE__
- if (errno != EPERM || ::kill(pid, 0) != 0)
-#endif
- logError(SysError("killing process %d", pid).info());
- }
-
- return wait();
-}
-
-
-int Pid::wait()
-{
- assert(pid != -1);
- while (1) {
- int status;
- int res = waitpid(pid, &status, 0);
- if (res == pid) {
- pid = -1;
- return status;
- }
- if (errno != EINTR)
- throw SysError("cannot get exit status of PID %d", pid);
- checkInterrupt();
- }
-}
-
-
-void Pid::setSeparatePG(bool separatePG)
-{
- this->separatePG = separatePG;
-}
-
-
-void Pid::setKillSignal(int signal)
-{
- this->killSignal = signal;
-}
-
-
-pid_t Pid::release()
-{
- pid_t p = pid;
- pid = -1;
- return p;
-}
-
-
-void killUser(uid_t uid)
-{
- debug("killing all processes running under uid '%1%'", uid);
-
- assert(uid != 0); /* just to be safe... */
-
- /* The system call kill(-1, sig) sends the signal `sig' to all
- users to which the current process can send signals. So we
- fork a process, switch to uid, and send a mass kill. */
-
- Pid pid = startProcess([&]() {
-
- if (setuid(uid) == -1)
- throw SysError("setting uid");
-
- while (true) {
-#ifdef __APPLE__
- /* OSX's kill syscall takes a third parameter that, among
- other things, determines if kill(-1, signo) affects the
- calling process. In the OSX libc, it's set to true,
- which means "follow POSIX", which we don't want here
- */
- if (syscall(SYS_kill, -1, SIGKILL, false) == 0) break;
-#else
- if (kill(-1, SIGKILL) == 0) break;
-#endif
- if (errno == ESRCH || errno == EPERM) break; /* no more processes */
- if (errno != EINTR)
- throw SysError("cannot kill processes for uid '%1%'", uid);
- }
-
- _exit(0);
- });
-
- int status = pid.wait();
- if (status != 0)
- throw Error("cannot kill processes for uid '%1%': %2%", uid, statusToString(status));
-
- /* !!! We should really do some check to make sure that there are
- no processes left running under `uid', but there is no portable
- way to do so (I think). The most reliable way may be `ps -eo
- uid | grep -q $uid'. */
-}
-
-
-//////////////////////////////////////////////////////////////////////
-
-
-static pid_t doFork(std::function<void()> fun)
-{
- pid_t pid = fork();
- if (pid != 0) return pid;
- fun();
- abort();
-}
-
-
-#if __linux__
-static int childEntry(void * arg)
-{
- auto main = (std::function<void()> *) arg;
- (*main)();
- return 1;
-}
-#endif
-
-
-pid_t startProcess(std::function<void()> fun, const ProcessOptions & options)
-{
- std::function<void()> wrapper = [&]() {
- logger = makeSimpleLogger();
- try {
-#if __linux__
- if (options.dieWithParent && prctl(PR_SET_PDEATHSIG, SIGKILL) == -1)
- throw SysError("setting death signal");
-#endif
- fun();
- } catch (std::exception & e) {
- try {
- std::cerr << options.errorPrefix << e.what() << "\n";
- } catch (...) { }
- } catch (...) { }
- if (options.runExitHandlers)
- exit(1);
- else
- _exit(1);
- };
-
- pid_t pid = -1;
-
- if (options.cloneFlags) {
- #ifdef __linux__
- // Not supported, since then we don't know when to free the stack.
- assert(!(options.cloneFlags & CLONE_VM));
-
- size_t stackSize = 1 * 1024 * 1024;
- auto stack = (char *) mmap(0, stackSize,
- PROT_WRITE | PROT_READ, MAP_PRIVATE | MAP_ANONYMOUS | MAP_STACK, -1, 0);
- if (stack == MAP_FAILED) throw SysError("allocating stack");
-
- Finally freeStack([&]() { munmap(stack, stackSize); });
-
- pid = clone(childEntry, stack + stackSize, options.cloneFlags | SIGCHLD, &wrapper);
- #else
- throw Error("clone flags are only supported on Linux");
- #endif
- } else
- pid = doFork(wrapper);
-
- if (pid == -1) throw SysError("unable to fork");
-
- return pid;
-}
-
-
-std::vector<char *> stringsToCharPtrs(const Strings & ss)
-{
- std::vector<char *> res;
- for (auto & s : ss) res.push_back((char *) s.c_str());
- res.push_back(0);
- return res;
-}
-
-std::string runProgram(Path program, bool searchPath, const Strings & args,
- const std::optional<std::string> & input, bool isInteractive)
-{
- auto res = runProgram(RunOptions {.program = program, .searchPath = searchPath, .args = args, .input = input, .isInteractive = isInteractive});
-
- if (!statusOk(res.first))
- throw ExecError(res.first, "program '%1%' %2%", program, statusToString(res.first));
-
- return res.second;
-}
-
-// Output = error code + "standard out" output stream
-std::pair<int, std::string> runProgram(RunOptions && options)
-{
- StringSink sink;
- options.standardOut = &sink;
-
- int status = 0;
-
- try {
- runProgram2(options);
- } catch (ExecError & e) {
- status = e.status;
- }
-
- return {status, std::move(sink.s)};
-}
-
-void runProgram2(const RunOptions & options)
-{
- checkInterrupt();
-
- assert(!(options.standardIn && options.input));
-
- std::unique_ptr<Source> source_;
- Source * source = options.standardIn;
-
- if (options.input) {
- source_ = std::make_unique<StringSource>(*options.input);
- source = source_.get();
- }
-
- /* Create a pipe. */
- Pipe out, in;
- if (options.standardOut) out.create();
- if (source) in.create();
-
- ProcessOptions processOptions;
-
- std::optional<Finally<std::function<void()>>> resumeLoggerDefer;
- if (options.isInteractive) {
- logger->pause();
- resumeLoggerDefer.emplace(
- []() {
- logger->resume();
- }
- );
- }
-
- /* Fork. */
- Pid pid = startProcess([&]() {
- if (options.environment)
- replaceEnv(*options.environment);
- if (options.standardOut && dup2(out.writeSide.get(), STDOUT_FILENO) == -1)
- throw SysError("dupping stdout");
- if (options.mergeStderrToStdout)
- if (dup2(STDOUT_FILENO, STDERR_FILENO) == -1)
- throw SysError("cannot dup stdout into stderr");
- if (source && dup2(in.readSide.get(), STDIN_FILENO) == -1)
- throw SysError("dupping stdin");
-
- if (options.chdir && chdir((*options.chdir).c_str()) == -1)
- throw SysError("chdir failed");
- if (options.gid && setgid(*options.gid) == -1)
- throw SysError("setgid failed");
- /* Drop all other groups if we're setgid. */
- if (options.gid && setgroups(0, 0) == -1)
- throw SysError("setgroups failed");
- if (options.uid && setuid(*options.uid) == -1)
- throw SysError("setuid failed");
-
- Strings args_(options.args);
- args_.push_front(options.program);
-
- restoreProcessContext();
-
- if (options.searchPath)
- execvp(options.program.c_str(), stringsToCharPtrs(args_).data());
- // This allows you to refer to a program with a pathname relative
- // to the PATH variable.
- else
- execv(options.program.c_str(), stringsToCharPtrs(args_).data());
-
- throw SysError("executing '%1%'", options.program);
- }, processOptions);
-
- out.writeSide.close();
-
- std::thread writerThread;
-
- std::promise<void> promise;
-
- Finally doJoin([&]() {
- if (writerThread.joinable())
- writerThread.join();
- });
-
-
- if (source) {
- in.readSide.close();
- writerThread = std::thread([&]() {
- try {
- std::vector<char> buf(8 * 1024);
- while (true) {
- size_t n;
- try {
- n = source->read(buf.data(), buf.size());
- } catch (EndOfFile &) {
- break;
- }
- writeFull(in.writeSide.get(), {buf.data(), n});
- }
- promise.set_value();
- } catch (...) {
- promise.set_exception(std::current_exception());
- }
- in.writeSide.close();
- });
- }
-
- if (options.standardOut)
- drainFD(out.readSide.get(), *options.standardOut);
-
- /* Wait for the child to finish. */
- int status = pid.wait();
-
- /* Wait for the writer thread to finish. */
- if (source) promise.get_future().get();
-
- if (status)
- throw ExecError(status, "program '%1%' %2%", options.program, statusToString(status));
-}
-
-
-void closeMostFDs(const std::set<int> & exceptions)
-{
-#if __linux__
- try {
- for (auto & s : readDirectory("/proc/self/fd")) {
- auto fd = std::stoi(s.name);
- if (!exceptions.count(fd)) {
- debug("closing leaked FD %d", fd);
- close(fd);
- }
- }
- return;
- } catch (SysError &) {
- }
-#endif
-
- int maxFD = 0;
- maxFD = sysconf(_SC_OPEN_MAX);
- for (int fd = 0; fd < maxFD; ++fd)
- if (!exceptions.count(fd))
- close(fd); /* ignore result */
-}
-
-
-void closeOnExec(int fd)
-{
- int prev;
- if ((prev = fcntl(fd, F_GETFD, 0)) == -1 ||
- fcntl(fd, F_SETFD, prev | FD_CLOEXEC) == -1)
- throw SysError("setting close-on-exec flag");
-}
-
-
-//////////////////////////////////////////////////////////////////////
-
-
-template<class C> C tokenizeString(std::string_view s, std::string_view separators)
-{
- C result;
- auto pos = s.find_first_not_of(separators, 0);
- while (pos != std::string_view::npos) {
- auto end = s.find_first_of(separators, pos + 1);
- if (end == std::string_view::npos) end = s.size();
- result.insert(result.end(), std::string(s, pos, end - pos));
- pos = s.find_first_not_of(separators, end);
- }
- return result;
-}
-
-template Strings tokenizeString(std::string_view s, std::string_view separators);
-template StringSet tokenizeString(std::string_view s, std::string_view separators);
-template std::vector<std::string> tokenizeString(std::string_view s, std::string_view separators);
-
-
-std::string chomp(std::string_view s)
-{
- size_t i = s.find_last_not_of(" \n\r\t");
- return i == std::string_view::npos ? "" : std::string(s, 0, i + 1);
-}
-
-
-std::string trim(std::string_view s, std::string_view whitespace)
-{
- auto i = s.find_first_not_of(whitespace);
- if (i == s.npos) return "";
- auto j = s.find_last_not_of(whitespace);
- return std::string(s, i, j == s.npos ? j : j - i + 1);
-}
-
-
-std::string replaceStrings(
- std::string res,
- std::string_view from,
- std::string_view to)
-{
- if (from.empty()) return res;
- size_t pos = 0;
- while ((pos = res.find(from, pos)) != std::string::npos) {
- res.replace(pos, from.size(), to);
- pos += to.size();
- }
- return res;
-}
-
-
-Rewriter::Rewriter(std::map<std::string, std::string> rewrites)
- : rewrites(std::move(rewrites))
-{
- for (const auto & [k, v] : this->rewrites) {
- assert(!k.empty());
- initials.push_back(k[0]);
- }
- std::ranges::sort(initials);
- auto [firstDupe, end] = std::ranges::unique(initials);
- initials.erase(firstDupe, end);
-}
-
-std::string Rewriter::operator()(std::string s)
-{
- size_t j = 0;
- while ((j = s.find_first_of(initials, j)) != std::string::npos) {
- size_t skip = 1;
- for (auto & [from, to] : rewrites) {
- if (s.compare(j, from.size(), from) == 0) {
- s.replace(j, from.size(), to);
- skip = to.size();
- break;
- }
- }
- j += skip;
- }
- return s;
-}
-
-
-std::string statusToString(int status)
-{
- if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) {
- if (WIFEXITED(status))
- return fmt("failed with exit code %1%", WEXITSTATUS(status));
- else if (WIFSIGNALED(status)) {
- int sig = WTERMSIG(status);
-#if HAVE_STRSIGNAL
- const char * description = strsignal(sig);
- return fmt("failed due to signal %1% (%2%)", sig, description);
-#else
- return fmt("failed due to signal %1%", sig);
-#endif
- }
- else
- return "died abnormally";
- } else return "succeeded";
-}
-
-
-bool statusOk(int status)
-{
- return WIFEXITED(status) && WEXITSTATUS(status) == 0;
-}
-
-
-std::string toLower(const std::string & s)
-{
- std::string r(s);
- for (auto & c : r)
- c = std::tolower(c);
- return r;
-}
-
-
-std::string shellEscape(const std::string_view s)
-{
- std::string r;
- r.reserve(s.size() + 2);
- r += "'";
- for (auto & i : s)
- if (i == '\'') r += "'\\''"; else r += i;
- r += '\'';
- return r;
-}
-
-
-void ignoreException(Verbosity lvl)
-{
- /* Make sure no exceptions leave this function.
- printError() also throws when remote is closed. */
- try {
- try {
- throw;
- } catch (std::exception & e) {
- printMsg(lvl, "error (ignored): %1%", e.what());
- }
- } catch (...) { }
-}
-
-bool shouldANSI()
-{
- return isatty(STDERR_FILENO)
- && getEnv("TERM").value_or("dumb") != "dumb"
- && !(getEnv("NO_COLOR").has_value() || getEnv("NOCOLOR").has_value());
-}
-
-std::string filterANSIEscapes(std::string_view s, bool filterAll, unsigned int width)
-{
- std::string t, e;
- size_t w = 0;
- auto i = s.begin();
-
- while (w < (size_t) width && i != s.end()) {
-
- if (*i == '\e') {
- std::string e;
- e += *i++;
- char last = 0;
-
- if (i != s.end() && *i == '[') {
- e += *i++;
- // eat parameter bytes
- while (i != s.end() && *i >= 0x30 && *i <= 0x3f) e += *i++;
- // eat intermediate bytes
- while (i != s.end() && *i >= 0x20 && *i <= 0x2f) e += *i++;
- // eat final byte
- if (i != s.end() && *i >= 0x40 && *i <= 0x7e) e += last = *i++;
- } else {
- if (i != s.end() && *i >= 0x40 && *i <= 0x5f) e += *i++;
- }
-
- if (!filterAll && last == 'm')
- t += e;
- }
-
- else if (*i == '\t') {
- i++; t += ' '; w++;
- while (w < (size_t) width && w % 8) {
- t += ' '; w++;
- }
- }
-
- else if (*i == '\r' || *i == '\a')
- // do nothing for now
- i++;
-
- else {
- w++;
- // Copy one UTF-8 character.
- if ((*i & 0xe0) == 0xc0) {
- t += *i++;
- if (i != s.end() && ((*i & 0xc0) == 0x80)) t += *i++;
- } else if ((*i & 0xf0) == 0xe0) {
- t += *i++;
- if (i != s.end() && ((*i & 0xc0) == 0x80)) {
- t += *i++;
- if (i != s.end() && ((*i & 0xc0) == 0x80)) t += *i++;
- }
- } else if ((*i & 0xf8) == 0xf0) {
- t += *i++;
- if (i != s.end() && ((*i & 0xc0) == 0x80)) {
- t += *i++;
- if (i != s.end() && ((*i & 0xc0) == 0x80)) {
- t += *i++;
- if (i != s.end() && ((*i & 0xc0) == 0x80)) t += *i++;
- }
- }
- } else
- t += *i++;
- }
- }
-
- return t;
-}
-
-
-constexpr char base64Chars[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
-
-std::string base64Encode(std::string_view s)
-{
- std::string res;
- res.reserve((s.size() + 2) / 3 * 4);
- int data = 0, nbits = 0;
-
- for (char c : s) {
- data = data << 8 | (unsigned char) c;
- nbits += 8;
- while (nbits >= 6) {
- nbits -= 6;
- res.push_back(base64Chars[data >> nbits & 0x3f]);
- }
- }
-
- if (nbits) res.push_back(base64Chars[data << (6 - nbits) & 0x3f]);
- while (res.size() % 4) res.push_back('=');
-
- return res;
-}
-
-
-std::string base64Decode(std::string_view s)
-{
- constexpr char npos = -1;
- constexpr std::array<char, 256> base64DecodeChars = [&]() {
- std::array<char, 256> result{};
- for (auto& c : result)
- c = npos;
- for (int i = 0; i < 64; i++)
- result[base64Chars[i]] = i;
- return result;
- }();
-
- std::string res;
- // Some sequences are missing the padding consisting of up to two '='.
- // vvv
- res.reserve((s.size() + 2) / 4 * 3);
- unsigned int d = 0, bits = 0;
-
- for (char c : s) {
- if (c == '=') break;
- if (c == '\n') continue;
-
- char digit = base64DecodeChars[(unsigned char) c];
- if (digit == npos)
- throw Error("invalid character in Base64 string: '%c'", c);
-
- bits += 6;
- d = d << 6 | digit;
- if (bits >= 8) {
- res.push_back(d >> (bits - 8) & 0xff);
- bits -= 8;
- }
- }
-
- return res;
-}
-
-
-std::string stripIndentation(std::string_view s)
-{
- size_t minIndent = 10000;
- size_t curIndent = 0;
- bool atStartOfLine = true;
-
- for (auto & c : s) {
- if (atStartOfLine && c == ' ')
- curIndent++;
- else if (c == '\n') {
- if (atStartOfLine)
- minIndent = std::max(minIndent, curIndent);
- curIndent = 0;
- atStartOfLine = true;
- } else {
- if (atStartOfLine) {
- minIndent = std::min(minIndent, curIndent);
- atStartOfLine = false;
- }
- }
- }
-
- std::string res;
-
- size_t pos = 0;
- while (pos < s.size()) {
- auto eol = s.find('\n', pos);
- if (eol == s.npos) eol = s.size();
- if (eol - pos > minIndent)
- res.append(s.substr(pos + minIndent, eol - pos - minIndent));
- res.push_back('\n');
- pos = eol + 1;
- }
-
- return res;
-}
-
-
-std::pair<std::string_view, std::string_view> getLine(std::string_view s)
-{
- auto newline = s.find('\n');
-
- if (newline == s.npos) {
- return {s, ""};
- } else {
- auto line = s.substr(0, newline);
- if (!line.empty() && line[line.size() - 1] == '\r')
- line = line.substr(0, line.size() - 1);
- return {line, s.substr(newline + 1)};
- }
-}
-
-
-//////////////////////////////////////////////////////////////////////
-
-static Sync<std::pair<unsigned short, unsigned short>> windowSize{{0, 0}};
-
-
-void updateWindowSize()
-{
- struct winsize ws;
- if (ioctl(2, TIOCGWINSZ, &ws) == 0) {
- auto windowSize_(windowSize.lock());
- windowSize_->first = ws.ws_row;
- windowSize_->second = ws.ws_col;
- }
-}
-
-
-std::pair<unsigned short, unsigned short> getWindowSize()
-{
- return *windowSize.lock();
-}
-
-
-rlim_t savedStackSize = 0;
-
-void setStackSize(rlim_t stackSize)
-{
- struct rlimit limit;
- if (getrlimit(RLIMIT_STACK, &limit) == 0 && limit.rlim_cur < stackSize) {
- savedStackSize = limit.rlim_cur;
- limit.rlim_cur = std::min(stackSize, limit.rlim_max);
- if (setrlimit(RLIMIT_STACK, &limit) != 0) {
- logger->log(
- lvlError,
- HintFmt(
- "Failed to increase stack size from %1% to %2% (maximum allowed stack size: %3%): %4%",
- savedStackSize,
- stackSize,
- limit.rlim_max,
- std::strerror(errno)
- ).str()
- );
- }
- }
-}
-
-#if __linux__
-static AutoCloseFD fdSavedMountNamespace;
-static AutoCloseFD fdSavedRoot;
-#endif
-
-void saveMountNamespace()
-{
-#if __linux__
- static std::once_flag done;
- std::call_once(done, []() {
- fdSavedMountNamespace = AutoCloseFD{open("/proc/self/ns/mnt", O_RDONLY)};
- if (!fdSavedMountNamespace)
- throw SysError("saving parent mount namespace");
-
- fdSavedRoot = AutoCloseFD{open("/proc/self/root", O_RDONLY)};
- });
-#endif
-}
-
-void restoreMountNamespace()
-{
-#if __linux__
- try {
- auto savedCwd = absPath(".");
-
- if (fdSavedMountNamespace && setns(fdSavedMountNamespace.get(), CLONE_NEWNS) == -1)
- throw SysError("restoring parent mount namespace");
-
- if (fdSavedRoot) {
- if (fchdir(fdSavedRoot.get()))
- throw SysError("chdir into saved root");
- if (chroot("."))
- throw SysError("chroot into saved root");
- }
-
- if (chdir(savedCwd.c_str()) == -1)
- throw SysError("restoring cwd");
- } catch (Error & e) {
- debug(e.msg());
- }
-#endif
-}
-
-void unshareFilesystem()
-{
-#ifdef __linux__
- if (unshare(CLONE_FS) != 0 && errno != EPERM)
- throw SysError("unsharing filesystem state in download thread");
-#endif
-}
-
-void restoreProcessContext(bool restoreMounts)
-{
- restoreSignals();
- if (restoreMounts) {
- restoreMountNamespace();
- }
-
- if (savedStackSize) {
- struct rlimit limit;
- if (getrlimit(RLIMIT_STACK, &limit) == 0) {
- limit.rlim_cur = savedStackSize;
- setrlimit(RLIMIT_STACK, &limit);
- }
- }
-}
-
-AutoCloseFD createUnixDomainSocket()
-{
- AutoCloseFD fdSocket{socket(PF_UNIX, SOCK_STREAM
- #ifdef SOCK_CLOEXEC
- | SOCK_CLOEXEC
- #endif
- , 0)};
- if (!fdSocket)
- throw SysError("cannot create Unix domain socket");
- closeOnExec(fdSocket.get());
- return fdSocket;
-}
-
-
-AutoCloseFD createUnixDomainSocket(const Path & path, mode_t mode)
-{
- auto fdSocket = nix::createUnixDomainSocket();
-
- bind(fdSocket.get(), path);
-
- chmodPath(path.c_str(), mode);
-
- if (listen(fdSocket.get(), 100) == -1)
- throw SysError("cannot listen on socket '%1%'", path);
-
- return fdSocket;
-}
-
-
-static void bindConnectProcHelper(
- std::string_view operationName, auto && operation,
- int fd, const std::string & path)
-{
- struct sockaddr_un addr;
- addr.sun_family = AF_UNIX;
-
- // Casting between types like these legacy C library interfaces
- // require is forbidden in C++. To maintain backwards
- // compatibility, the implementation of the bind/connect functions
- // contains some hints to the compiler that allow for this
- // special case.
- auto * psaddr = reinterpret_cast<struct sockaddr *>(&addr);
-
- if (path.size() + 1 >= sizeof(addr.sun_path)) {
- Pipe pipe;
- pipe.create();
- Pid pid = startProcess([&] {
- try {
- pipe.readSide.close();
- Path dir = dirOf(path);
- if (chdir(dir.c_str()) == -1)
- throw SysError("chdir to '%s' failed", dir);
- std::string base(baseNameOf(path));
- if (base.size() + 1 >= sizeof(addr.sun_path))
- throw Error("socket path '%s' is too long", base);
- memcpy(addr.sun_path, base.c_str(), base.size() + 1);
- if (operation(fd, psaddr, sizeof(addr)) == -1)
- throw SysError("cannot %s to socket at '%s'", operationName, path);
- writeFull(pipe.writeSide.get(), "0\n");
- } catch (SysError & e) {
- writeFull(pipe.writeSide.get(), fmt("%d\n", e.errNo));
- } catch (...) {
- writeFull(pipe.writeSide.get(), "-1\n");
- }
- });
- pipe.writeSide.close();
- auto errNo = string2Int<int>(chomp(drainFD(pipe.readSide.get())));
- if (!errNo || *errNo == -1)
- throw Error("cannot %s to socket at '%s'", operationName, path);
- else if (*errNo > 0) {
- errno = *errNo;
- throw SysError("cannot %s to socket at '%s'", operationName, path);
- }
- } else {
- memcpy(addr.sun_path, path.c_str(), path.size() + 1);
- if (operation(fd, psaddr, sizeof(addr)) == -1)
- throw SysError("cannot %s to socket at '%s'", operationName, path);
- }
-}
-
-
-void bind(int fd, const std::string & path)
-{
- unlink(path.c_str());
-
- bindConnectProcHelper("bind", ::bind, fd, path);
-}
-
-
-void connect(int fd, const std::string & path)
-{
- bindConnectProcHelper("connect", ::connect, fd, path);
-}
-
-
-std::string showBytes(uint64_t bytes)
-{
- return fmt("%.2f MiB", bytes / (1024.0 * 1024.0));
-}
-
-
-// FIXME: move to libstore/build
-void commonChildInit()
-{
- logger = makeSimpleLogger();
-
- const static std::string pathNullDevice = "/dev/null";
- restoreProcessContext(false);
-
- /* Put the child in a separate session (and thus a separate
- process group) so that it has no controlling terminal (meaning
- that e.g. ssh cannot open /dev/tty) and it doesn't receive
- terminal signals. */
- if (setsid() == -1)
- throw SysError("creating a new session");
-
- /* Dup stderr to stdout. */
- if (dup2(STDERR_FILENO, STDOUT_FILENO) == -1)
- throw SysError("cannot dup stderr into stdout");
-
- /* Reroute stdin to /dev/null. */
- int fdDevNull = open(pathNullDevice.c_str(), O_RDWR);
- if (fdDevNull == -1)
- throw SysError("cannot open '%1%'", pathNullDevice);
- if (dup2(fdDevNull, STDIN_FILENO) == -1)
- throw SysError("cannot dup null device into stdin");
- close(fdDevNull);
-}
-
-}
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-22 13:31:37 +0000