mirror of
https://github.com/NixOS/nix
synced 2025-07-04 15:31:47 +02:00
02fa20622f
This splits files and adds new identifiers in preperation for supporting windows, but no Windows-specific code is actually added yet. Co-authored-by: Robert Hensing <roberth@users.noreply.github.com>
66 lines
1.9 KiB
C++
66 lines
1.9 KiB
C++
#include "util.hh"
|
|
#include "users.hh"
|
|
#include "environment-variables.hh"
|
|
#include "file-system.hh"
|
|
|
|
#include <pwd.h>
|
|
#include <sys/types.h>
|
|
#include <unistd.h>
|
|
|
|
namespace nix {
|
|
|
|
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;
|
|
}
|
|
|
|
bool isRootUser() {
|
|
return getuid() == 0;
|
|
}
|
|
|
|
}
|