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Get effective user in Nix commands

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‘geteuid’ gives us the user that the command is being run as,
including in setuid modes. By using geteuid to determind id, we can
avoid the ‘sudo -i’ hack when upgrading Nix. So now, upgrading Nix on
macOS is as simple as:

$ sudo nix-channel --update
$ sudo nix-env -u

$ sudo launchctl stop org.nixos.nix-daemon
$ sudo launchctl start org.nixos.nix-daemon
or
$ sudo systemctl restart nix-daemon
This commit is contained in:
Matthew Bauer 2018-09-04 19:32:39 -05:00
parent 5e0a7206f5
commit 74f6d8767d
2 changed files with 2 additions and 2 deletions
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2
src/libutil/util.cc
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@ -468,7 +468,7 @@ static Lazy<Path> getHome2([]() {
std::vector<char> buf(16384); std::vector<char> buf(16384);
struct passwd pwbuf; struct passwd pwbuf;
struct passwd * pw; struct passwd * pw;
if (getpwuid_r(getuid(), &pwbuf, buf.data(), buf.size(), &pw) != 0 if (getpwuid_r(geteuid(), &pwbuf, buf.data(), buf.size(), &pw) != 0
|| !pw || !pw->pw_dir || !pw->pw_dir[0]) || !pw || !pw->pw_dir || !pw->pw_dir[0])
throw Error("cannot determine user's home directory"); throw Error("cannot determine user's home directory");
homeDir = pw->pw_dir; homeDir = pw->pw_dir;

2
src/nix-channel/nix-channel.cc
View file

@ -169,7 +169,7 @@ int main(int argc, char ** argv)
// Figure out the name of the channels profile. // Figure out the name of the channels profile.
; ;
auto pw = getpwuid(getuid()); auto pw = getpwuid(geteuid());
std::string name = pw ? pw->pw_name : getEnv("USER", ""); std::string name = pw ? pw->pw_name : getEnv("USER", "");
if (name.empty()) if (name.empty())
throw Error("cannot figure out user name"); throw Error("cannot figure out user name");