117 lines
3.0 KiB
C++
117 lines
3.0 KiB
C++
#include "util.hh"
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#include "users.hh"
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#include "environment-variables.hh"
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#include "file-system.hh"
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#include <pwd.h>
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#include <sys/types.h>
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#include <unistd.h>
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namespace nix {
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std::string getUserName()
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{
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auto pw = getpwuid(geteuid());
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std::string name = pw ? pw->pw_name : getEnv("USER").value_or("");
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if (name.empty())
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throw Error("cannot figure out user name");
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return name;
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}
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Path getHomeOf(uid_t userId)
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{
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std::vector<char> buf(16384);
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struct passwd pwbuf;
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struct passwd * pw;
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if (getpwuid_r(userId, &pwbuf, buf.data(), buf.size(), &pw) != 0
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|| !pw || !pw->pw_dir || !pw->pw_dir[0])
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throw Error("cannot determine user's home directory");
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return pw->pw_dir;
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}
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Path getHome()
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{
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static Path homeDir = []()
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{
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std::optional<std::string> unownedUserHomeDir = {};
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auto homeDir = getEnv("HOME");
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if (homeDir) {
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// Only use $HOME if doesn't exist or is owned by the current user.
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struct stat st;
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int result = stat(homeDir->c_str(), &st);
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if (result != 0) {
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if (errno != ENOENT) {
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warn("couldn't stat $HOME ('%s') for reason other than not existing ('%d'), falling back to the one defined in the 'passwd' file", *homeDir, errno);
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homeDir.reset();
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}
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} else if (st.st_uid != geteuid()) {
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unownedUserHomeDir.swap(homeDir);
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}
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}
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if (!homeDir) {
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homeDir = getHomeOf(geteuid());
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if (unownedUserHomeDir.has_value() && unownedUserHomeDir != homeDir) {
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warn("$HOME ('%s') is not owned by you, falling back to the one defined in the 'passwd' file ('%s')", *unownedUserHomeDir, *homeDir);
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}
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}
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return *homeDir;
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}();
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return homeDir;
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}
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Path getCacheDir()
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{
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auto cacheDir = getEnv("XDG_CACHE_HOME");
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return cacheDir ? *cacheDir : getHome() + "/.cache";
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}
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Path getConfigDir()
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{
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auto configDir = getEnv("XDG_CONFIG_HOME");
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return configDir ? *configDir : getHome() + "/.config";
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}
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std::vector<Path> getConfigDirs()
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{
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Path configHome = getConfigDir();
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auto configDirs = getEnv("XDG_CONFIG_DIRS").value_or("/etc/xdg");
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std::vector<Path> result = tokenizeString<std::vector<std::string>>(configDirs, ":");
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result.insert(result.begin(), configHome);
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return result;
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}
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Path getDataDir()
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{
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auto dataDir = getEnv("XDG_DATA_HOME");
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return dataDir ? *dataDir : getHome() + "/.local/share";
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}
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Path getStateDir()
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{
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auto stateDir = getEnv("XDG_STATE_HOME");
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return stateDir ? *stateDir : getHome() + "/.local/state";
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}
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Path createNixStateDir()
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{
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Path dir = getStateDir() + "/nix";
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createDirs(dir);
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return dir;
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}
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std::string expandTilde(std::string_view path)
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{
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// TODO: expand ~user ?
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auto tilde = path.substr(0, 2);
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if (tilde == "~/" || tilde == "~")
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return getHome() + std::string(path.substr(1));
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else
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return std::string(path);
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}
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}
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