nix-build: Port to c++

This was a dumb line-for-line rewrite, because nix build/nix run/etc.
will replace it.
This commit is contained in:
Shea Levy 2016-08-09 06:24:19 -04:00
parent eef754813f
commit 80ebc553ec
6 changed files with 495 additions and 362 deletions

4
.gitignore vendored
View file

@ -40,7 +40,6 @@ Makefile.config
/scripts/nix-prefetch-url /scripts/nix-prefetch-url
/scripts/nix-install-package /scripts/nix-install-package
/scripts/nix-channel /scripts/nix-channel
/scripts/nix-build
/scripts/nix-copy-closure /scripts/nix-copy-closure
/scripts/NixConfig.pm /scripts/NixConfig.pm
/scripts/NixManifest.pm /scripts/NixManifest.pm
@ -77,6 +76,9 @@ Makefile.config
# /src/download-via-ssh/ # /src/download-via-ssh/
/src/download-via-ssh/download-via-ssh /src/download-via-ssh/download-via-ssh
# /src/nix-build/
/src/nix-build/nix-build
# /tests/ # /tests/
/tests/test-tmp /tests/test-tmp
/tests/common.sh /tests/common.sh

View file

@ -12,6 +12,7 @@ makefiles = \
src/nix-daemon/local.mk \ src/nix-daemon/local.mk \
src/nix-collect-garbage/local.mk \ src/nix-collect-garbage/local.mk \
src/nix-prefetch-url/local.mk \ src/nix-prefetch-url/local.mk \
src/nix-build/local.mk \
perl/local.mk \ perl/local.mk \
scripts/local.mk \ scripts/local.mk \
corepkgs/local.mk \ corepkgs/local.mk \

View file

@ -1,5 +1,4 @@
nix_bin_scripts := \ nix_bin_scripts := \
$(d)/nix-build \
$(d)/nix-channel \ $(d)/nix-channel \
$(d)/nix-copy-closure \ $(d)/nix-copy-closure \
$(d)/nix-install-package \ $(d)/nix-install-package \
@ -26,6 +25,5 @@ $(eval $(call install-program-in, $(d)/build-remote.pl, $(libexecdir)/nix))
ifeq ($(OS), Darwin) ifeq ($(OS), Darwin)
$(eval $(call install-program-in, $(d)/resolve-system-dependencies.pl, $(libexecdir)/nix)) $(eval $(call install-program-in, $(d)/resolve-system-dependencies.pl, $(libexecdir)/nix))
endif endif
$(eval $(call install-symlink, nix-build, $(bindir)/nix-shell))
clean-files += $(nix_bin_scripts) $(nix_noinst_scripts) clean-files += $(nix_bin_scripts) $(nix_noinst_scripts)

View file

@ -1,359 +0,0 @@
#! @perl@ -w @perlFlags@
use utf8;
use strict;
use Nix::Config;
use Nix::Store;
use Nix::Utils;
use File::Basename;
use Text::ParseWords;
use Cwd;
binmode STDERR, ":encoding(utf8)";
my $dryRun = 0;
my $verbose = 0;
my $runEnv = $0 =~ /nix-shell$/;
my $pure = 0;
my $fromArgs = 0;
my $packages = 0;
my $interactive = 1;
my @instArgs = ();
my @buildArgs = ();
my @exprs = ();
my $shell = $ENV{SHELL} || "/bin/sh";
my $envCommand = ""; # interactive shell
my @envExclude = ();
my $myName = $runEnv ? "nix-shell" : "nix-build";
my $inShebang = 0;
my $script;
my @savedArgs;
my $tmpDir = mkTempDir($myName);
my $outLink = "./result";
my $drvLink = "$tmpDir/derivation";
# Ensure that the $tmpDir is deleted.
$SIG{'INT'} = sub { exit 1 };
# Heuristic to see if we're invoked as a shebang script, namely, if we
# have a single argument, it's the name of an executable file, and it
# starts with "#!".
if ($runEnv && defined $ARGV[0] && $ARGV[0] !~ /nix-shell/) {
$script = $ARGV[0];
if (-f $script && -x $script) {
open SCRIPT, "<$script" or die "$0: cannot open $script: $!\n";
my $first = <SCRIPT>;
if ($first =~ /^\#\!/) {
$inShebang = 1;
@savedArgs = @ARGV; shift @savedArgs;
@ARGV = ();
while (<SCRIPT>) {
chomp;
if (/^\#\!\s*nix-shell (.*)$/) {
push @ARGV, shellwords($1);
}
}
}
close SCRIPT;
}
}
for (my $n = 0; $n < scalar @ARGV; $n++) {
my $arg = $ARGV[$n];
if ($arg eq "--help") {
exec "man $myName" or die;
}
elsif ($arg eq "--version") {
print "$myName (Nix) $Nix::Config::version\n";
exit 0;
}
elsif ($arg eq "--add-drv-link") {
$drvLink = "./derivation";
}
elsif ($arg eq "--no-out-link" || $arg eq "--no-link") {
$outLink = "$tmpDir/result";
}
elsif ($arg eq "--drv-link") {
$n++;
die "$0: $arg requires an argument\n" unless $n < scalar @ARGV;
$drvLink = $ARGV[$n];
}
elsif ($arg eq "--out-link" || $arg eq "-o") {
$n++;
die "$0: $arg requires an argument\n" unless $n < scalar @ARGV;
$outLink = $ARGV[$n];
}
elsif ($arg eq "--attr" || $arg eq "-A" || $arg eq "-I") {
$n++;
die "$0: $arg requires an argument\n" unless $n < scalar @ARGV;
push @instArgs, ($arg, $ARGV[$n]);
}
elsif ($arg eq "--arg" || $arg eq "--argstr") {
die "$0: $arg requires two arguments\n" unless $n + 2 < scalar @ARGV;
push @instArgs, ($arg, $ARGV[$n + 1], $ARGV[$n + 2]);
$n += 2;
}
elsif ($arg eq "--option") {
die "$0: $arg requires two arguments\n" unless $n + 2 < scalar @ARGV;
push @instArgs, ($arg, $ARGV[$n + 1], $ARGV[$n + 2]);
push @buildArgs, ($arg, $ARGV[$n + 1], $ARGV[$n + 2]);
$n += 2;
}
elsif ($arg eq "--max-jobs" || $arg eq "-j" || $arg eq "--max-silent-time" || $arg eq "--cores" || $arg eq "--timeout" || $arg eq '--add-root') {
$n++;
die "$0: $arg requires an argument\n" unless $n < scalar @ARGV;
push @buildArgs, ($arg, $ARGV[$n]);
}
elsif ($arg eq "--dry-run") {
push @buildArgs, "--dry-run";
$dryRun = 1;
}
elsif ($arg eq "--show-trace") {
push @instArgs, $arg;
}
elsif ($arg eq "-") {
@exprs = ("-");
}
elsif ($arg eq "--verbose" || substr($arg, 0, 2) eq "-v") {
push @buildArgs, $arg;
push @instArgs, $arg;
$verbose = 1;
}
elsif ($arg eq "--quiet" || $arg eq "--repair") {
push @buildArgs, $arg;
push @instArgs, $arg;
}
elsif ($arg eq "--check") {
push @buildArgs, $arg;
}
elsif ($arg eq "--run-env") { # obsolete
$runEnv = 1;
}
elsif ($arg eq "--command" || $arg eq "--run") {
$n++;
die "$0: $arg requires an argument\n" unless $n < scalar @ARGV;
$envCommand = "$ARGV[$n]\nexit";
$interactive = 0 if $arg eq "--run";
}
elsif ($arg eq "--exclude") {
$n++;
die "$0: $arg requires an argument\n" unless $n < scalar @ARGV;
push @envExclude, $ARGV[$n];
}
elsif ($arg eq "--pure") { $pure = 1; }
elsif ($arg eq "--impure") { $pure = 0; }
elsif ($arg eq "--expr" || $arg eq "-E") {
$fromArgs = 1;
push @instArgs, "--expr";
}
elsif ($arg eq "--packages" || $arg eq "-p") {
$packages = 1;
}
elsif ($inShebang && $arg eq "-i") {
$n++;
die "$0: $arg requires an argument\n" unless $n < scalar @ARGV;
my $interpreter = $ARGV[$n];
my $execArgs = "";
sub shellEscape {
my $s = $_;
$s =~ s/'/'\\''/g;
return "'" . $s . "'";
}
# Überhack to support Perl. Perl examines the shebang and
# executes it unless it contains the string "perl" or "indir",
# or (undocumented) argv[0] does not contain "perl". Exploit
# the latter by doing "exec -a".
if ($interpreter =~ /perl/) {
$execArgs = "-a PERL";
}
if ($interpreter =~ /ruby/) {
# Hack for Ruby. Ruby also examines the shebang. It tries to
# read the shebang to understand which packages to read from. Since
# this is handled via nix-shell -p, we wrap our ruby script execution
# in ruby -e 'load' which ignores the shebangs.
$envCommand = "exec $execArgs $interpreter -e 'load(\"$script\")' -- ${\(join ' ', (map shellEscape, @savedArgs))}";
} else {
$envCommand = "exec $execArgs $interpreter $script ${\(join ' ', (map shellEscape, @savedArgs))}";
}
}
elsif (substr($arg, 0, 1) eq "-") {
push @buildArgs, $arg;
}
elsif ($arg eq "-Q" || $arg eq "--no-build-output") {
push @buildArgs, $arg;
push @instArgs, $arg;
}
else {
push @exprs, $arg;
}
}
die "$0: -p and -E are mutually exclusive\n" if $packages && $fromArgs;
if ($packages) {
push @instArgs, "--expr";
@exprs = (
'with import <nixpkgs> { }; runCommand "shell" { buildInputs = [ '
. (join " ", map { "($_)" } @exprs) . ']; } ""');
} elsif (!$fromArgs) {
@exprs = ("shell.nix") if scalar @exprs == 0 && $runEnv && -e "shell.nix";
@exprs = ("default.nix") if scalar @exprs == 0;
}
$ENV{'IN_NIX_SHELL'} = 1 if $runEnv;
foreach my $expr (@exprs) {
# Instantiate.
my @drvPaths;
if ($expr !~ /^\/.*\.drv$/) {
# If we're in a #! script, interpret filenames relative to the
# script.
$expr = dirname(Cwd::abs_path($script)) . "/" . $expr
if $inShebang && !$packages && $expr !~ /^\//;
# !!! would prefer the perl 5.8.0 pipe open feature here.
my $pid = open(DRVPATHS, "-|") || exec "$Nix::Config::binDir/nix-instantiate", "--add-root", $drvLink, "--indirect", @instArgs, $expr;
while (<DRVPATHS>) {chomp; push @drvPaths, $_;}
if (!close DRVPATHS) {
die "nix-instantiate killed by signal " . ($? & 127) . "\n" if ($? & 127);
exit 1;
}
} else {
push @drvPaths, $expr;
}
if ($runEnv) {
die "$0: a single derivation is required\n" if scalar @drvPaths != 1;
my $drvPath = $drvPaths[0];
$drvPath = (split '!',$drvPath)[0];
$drvPath = readlink $drvPath or die "cannot read symlink $drvPath" if -l $drvPath;
my $drv = derivationFromPath($drvPath);
# Build or fetch all dependencies of the derivation.
my @inputDrvs = grep { my $x = $_; (grep { $x =~ $_ } @envExclude) == 0 } @{$drv->{inputDrvs}};
system("$Nix::Config::binDir/nix-store", "-r", "--no-output", "--no-gc-warning", @buildArgs, @inputDrvs, @{$drv->{inputSrcs}}) == 0
or die "$0: failed to build all dependencies\n";
# Set the environment.
my $tmp = $ENV{"TMPDIR"} // $ENV{"XDG_RUNTIME_DIR"} // "/tmp";
if ($pure) {
foreach my $name (keys %ENV) {
next if grep { $_ eq $name } ("HOME", "USER", "LOGNAME", "DISPLAY", "PATH", "TERM", "IN_NIX_SHELL", "TZ", "PAGER", "NIX_BUILD_SHELL");
delete $ENV{$name};
}
# NixOS hack: prevent /etc/bashrc from sourcing /etc/profile.
$ENV{'__ETC_PROFILE_SOURCED'} = 1;
}
$ENV{'NIX_BUILD_TOP'} = $ENV{'TMPDIR'} = $ENV{'TEMPDIR'} = $ENV{'TMP'} = $ENV{'TEMP'} = $tmp;
$ENV{'NIX_STORE'} = $Nix::Config::storeDir;
$ENV{$_} = $drv->{env}->{$_} foreach keys %{$drv->{env}};
# Run a shell using the derivation's environment. For
# convenience, source $stdenv/setup to setup additional
# environment variables and shell functions. Also don't lose
# the current $PATH directories.
my $rcfile = "$tmpDir/rc";
writeFile(
$rcfile,
"rm -rf '$tmpDir'; " .
'unset BASH_ENV; ' .
'[ -n "$PS1" ] && [ -e ~/.bashrc ] && source ~/.bashrc; ' .
($pure ? '' : 'p=$PATH; ' ) .
'dontAddDisableDepTrack=1; ' .
'[ -e $stdenv/setup ] && source $stdenv/setup; ' .
($pure ? '' : 'PATH=$PATH:$p; unset p; ') .
'set +e; ' .
'[ -n "$PS1" ] && PS1="\n\[\033[1;32m\][nix-shell:\w]$\[\033[0m\] "; ' .
'if [ "$(type -t runHook)" = function ]; then runHook shellHook; fi; ' .
'unset NIX_ENFORCE_PURITY; ' .
'unset NIX_INDENT_MAKE; ' .
'shopt -u nullglob; ' .
'unset TZ; ' . (defined $ENV{'TZ'} ? "export TZ='${ENV{'TZ'}}'; " : '') .
$envCommand);
$ENV{BASH_ENV} = $rcfile;
my @args = ($ENV{NIX_BUILD_SHELL} // "bash");
push @args, "--rcfile" if $interactive;
push @args, $rcfile;
exec @args;
die;
}
# Ugly hackery to make "nix-build -A foo.all" produce symlinks
# ./result, ./result-dev, and so on, rather than ./result,
# ./result-2-dev, and so on. This combines multiple derivation
# paths into one "/nix/store/drv-path!out1,out2,..." argument.
my $prevDrvPath = "";
my @drvPaths2;
foreach my $drvPath (@drvPaths) {
my $p = $drvPath; my $output = "out";
if ($drvPath =~ /(.*)!(.*)/) {
$p = $1; $output = $2;
} else {
$p = $drvPath;
}
my $target = readlink $p or die "cannot read symlink $p";
print STDERR "derivation is $target\n" if $verbose;
if ($target eq $prevDrvPath) {
push @drvPaths2, (pop @drvPaths2) . "," . $output;
} else {
push @drvPaths2, $target . "!" . $output;
$prevDrvPath = $target;
}
}
# Build.
my @outPaths;
my $pid = open(OUTPATHS, "-|") || exec "$Nix::Config::binDir/nix-store", "--add-root", $outLink, "--indirect", "-r",
@buildArgs, @drvPaths2;
while (<OUTPATHS>) {chomp; push @outPaths, $_;}
if (!close OUTPATHS) {
die "nix-store killed by signal " . ($? & 127) . "\n" if ($? & 127);
exit ($? >> 8 || 1);
}
next if $dryRun;
foreach my $outPath (@outPaths) {
my $target = readlink $outPath or die "cannot read symlink $outPath";
print "$target\n";
}
}

9
src/nix-build/local.mk Normal file
View file

@ -0,0 +1,9 @@
programs += nix-build
nix-build_DIR := $(d)
nix-build_SOURCES := $(d)/nix-build.cc
nix-build_LIBS = libmain libstore libutil libformat
$(eval $(call install-symlink, nix-build, $(bindir)/nix-shell))

482
src/nix-build/nix-build.cc Executable file
View file

@ -0,0 +1,482 @@
#include <cstring>
#include <regex>
#include "util.hh"
#include <unistd.h>
#include "shared.hh"
#include <sstream>
#include <vector>
#include <iostream>
#include <fstream>
#include "store-api.hh"
#include "globals.hh"
#include "derivations.hh"
using namespace nix;
using std::stringstream;
extern char ** environ;
std::vector<string> shellwords(const string & s)
{
auto whitespace = std::regex("^(\\s+).*");
auto begin = s.cbegin();
auto res = std::vector<string>{};
auto cur = stringstream{};
enum state {
sBegin,
sQuote
};
state st = sBegin;
auto it = begin;
for (; it != s.cend(); ++it) {
if (st == sBegin) {
auto match = std::smatch{};
if (regex_search(it, s.cend(), match, whitespace)) {
cur << string(begin, it);
res.push_back(cur.str());
cur = stringstream{};
it = match[1].second;
begin = it;
}
}
switch (*it) {
case '"':
cur << string(begin, it);
begin = it + 1;
st = st == sBegin ? sQuote : sBegin;
break;
case '\\':
/* perl shellwords mostly just treats the next char as part of the string with no special processing */
cur << string(begin, it);
begin = ++it;
break;
}
}
cur << string(begin, it);
auto last = cur.str();
if (!last.empty()) {
res.push_back(std::move(last));
}
return res;
}
int main(int argc, char ** argv)
{
return handleExceptions(argv[0], [&]() {
initNix();
auto store = openStore();
auto dryRun = false;
auto verbose = false;
auto runEnv = std::regex_search(argv[0], std::regex("nix-shell$"));
auto pure = false;
auto fromArgs = false;
auto packages = false;
auto interactive = true;
auto instArgs = Strings{};
auto buildArgs = Strings{};
auto exprs = Strings{};
auto shell = getEnv("SHELL", "/bin/sh");
auto envCommand = string{}; // interactive shell
auto envExclude = Strings{};
auto myName = runEnv ? "nix-shell" : "nix-build";
auto inShebang = false;
auto script = string{};
auto savedArgs = std::vector<string>{};
auto tmpDir = AutoDelete{createTempDir("", myName)};
auto outLink = string("./result");
auto drvLink = (Path) tmpDir + "/derivation";
auto args = std::vector<string>{};
for (int i = 1; i < argc; ++i)
args.push_back(argv[i]);
// Heuristic to see if we're invoked as a shebang script, namely, if we
// have a single argument, it's the name of an executable file, and it
// starts with "#!".
if (runEnv && argc > 1 && !std::regex_search(argv[1], std::regex("nix-shell"))) {
script = argv[1];
if (access(script.c_str(), F_OK) == 0 && access(script.c_str(), X_OK) == 0) {
auto SCRIPT = std::ifstream(script);
string first;
std::getline(SCRIPT, first);
if (std::regex_search(first, std::regex("^#!"))) {
inShebang = true;
for (int i = 2; i < argc - 1; ++i)
savedArgs.push_back(argv[i]);
args = std::vector<string>{};
for (string line; std::getline(SCRIPT, line);) {
line = chomp(line);
std::smatch match;
if (std::regex_match(line, match, std::regex("^#!\\s*nix-shell (.*)$")))
for (const auto & word : shellwords(match[1].str()))
args.push_back(word);
}
}
}
}
for (auto n = decltype(args)::size_type{0}; n < args.size(); ++n) {
auto arg = args[n];
if (arg == "--help") {
deletePath(tmpDir);
tmpDir.cancel();
execlp("man", "man", myName, NULL);
throw SysError("executing man");
}
else if (arg == "--version") {
std::cout << myName << " (Nix) " << nixVersion << '\n';
return;
}
else if (arg == "--add-drv-link") {
drvLink = "./derivation";
}
else if (arg == "--no-out-link" || arg == "--no-link") {
outLink = (Path) tmpDir + "/result";
}
else if (arg == "--drv-link") {
n++;
if (n >= args.size()) {
throw UsageError("--drv-link requires an argument");
}
drvLink = args[n];
}
else if (arg == "--out-link" || arg == "-o") {
n++;
if (n >= args.size()) {
throw UsageError(format("%1% requires an argument") % arg);
}
outLink = args[n];
}
else if (arg == "--attr" || arg == "-A" || arg == "-I") {
n++;
if (n >= args.size()) {
throw UsageError(format("%1% requires an argument") % arg);
}
instArgs.push_back(arg);
instArgs.push_back(args[n]);
}
else if (arg == "--arg" || arg == "--argstr") {
if (n + 2 >= args.size()) {
throw UsageError(format("%1% requires two arguments") % arg);
}
instArgs.push_back(arg);
instArgs.push_back(args[n + 1]);
instArgs.push_back(args[n + 2]);
n += 2;
}
else if (arg == "--option") {
if (n + 2 >= args.size()) {
throw UsageError(format("%1% requires two arguments") % arg);
}
instArgs.push_back(arg);
instArgs.push_back(args[n + 1]);
instArgs.push_back(args[n + 2]);
buildArgs.push_back(arg);
buildArgs.push_back(args[n + 1]);
buildArgs.push_back(args[n + 2]);
n += 2;
}
else if (arg == "--max-jobs" || arg == "-j" || arg == "--max-silent-time" || arg == "--cores" || arg == "--timeout" || arg == "--add-root") {
n++;
if (n >= args.size()) {
throw UsageError(format("%1% requires an argument") % arg);
}
buildArgs.push_back(arg);
buildArgs.push_back(args[n]);
}
else if (arg == "--dry-run") {
buildArgs.push_back("--dry-run");
dryRun = true;
}
else if (arg == "--show-trace") {
instArgs.push_back(arg);
}
else if (arg == "-") {
exprs = Strings{"-"};
}
else if (arg == "--verbose" || (arg.size() >= 2 && arg.substr(0, 2) == "-v")) {
buildArgs.push_back(arg);
instArgs.push_back(arg);
verbose = true;
}
else if (arg == "--quiet" || arg == "--repair") {
buildArgs.push_back(arg);
instArgs.push_back(arg);
}
else if (arg == "--check") {
buildArgs.push_back(arg);
}
else if (arg == "--run-env") { // obsolete
runEnv = true;
}
else if (arg == "--command" || arg == "--run") {
n++;
if (n >= args.size()) {
throw UsageError(format("%1% requires an argument") % arg);
}
envCommand = args[n] + "\nexit";
if (arg == "--run")
interactive = false;
}
else if (arg == "--exclude") {
n++;
if (n >= args.size()) {
throw UsageError(format("%1% requires an argument") % arg);
}
envExclude.push_back(args[n]);
}
else if (arg == "--pure") { pure = true; }
else if (arg == "--impure") { pure = false; }
else if (arg == "--expr" || arg == "-E") {
fromArgs = true;
instArgs.push_back("--expr");
}
else if (arg == "--packages" || arg == "-p") {
packages = true;
}
else if (inShebang && arg == "-i") {
n++;
if (n >= args.size()) {
throw UsageError(format("%1% requires an argument") % arg);
}
auto interpreter = args[n];
auto execArgs = "";
auto shellEscape = [](const string & s) {
return "'" + std::regex_replace(s, std::regex("'"), "'\\''") + "'";
};
// Überhack to support Perl. Perl examines the shebang and
// executes it unless it contains the string "perl" or "indir",
// or (undocumented) argv[0] does not contain "perl". Exploit
// the latter by doing "exec -a".
if (std::regex_search(interpreter, std::regex("perl"))) {
execArgs = "-a PERL";
}
auto joined = stringstream{};
for (const auto & i : savedArgs)
joined << shellEscape(i) << ' ';
if (std::regex_search(interpreter, std::regex("ruby"))) {
// Hack for Ruby. Ruby also examines the shebang. It tries to
// read the shebang to understand which packages to read from. Since
// this is handled via nix-shell -p, we wrap our ruby script execution
// in ruby -e 'load' which ignores the shebangs.
envCommand = (format("exec %1% %2% -e 'load(\"%3%\") -- %4%") % execArgs % interpreter % script % joined.str()).str();
} else {
envCommand = (format("exec %1% %2% %3% %4%") % execArgs % interpreter % script % joined.str()).str();
}
}
else if (!arg.empty() && arg[0] == '-') {
buildArgs.push_back(arg);
}
else if (arg == "-Q" || arg == "--no-build-output") {
buildArgs.push_back(arg);
instArgs.push_back(arg);
}
else {
exprs.push_back(arg);
}
}
if (packages && fromArgs) {
throw UsageError("-p and -E are mutually exclusive");
}
if (packages) {
instArgs.push_back("--expr");
auto joined = stringstream{};
joined << "with import <nixpkgs> { }; runCommand \"shell\" { buildInputs = [ ";
for (const auto & i : exprs)
joined << '(' << i << ") ";
joined << "]; } \"\"";
exprs = Strings{joined.str()};
} else if (!fromArgs) {
if (exprs.empty() && runEnv && access("shell.nix", F_OK) == 0)
exprs.push_back("shell.nix");
if (exprs.empty())
exprs.push_back("default.nix");
}
if (runEnv)
setenv("IN_NIX_SHELL", "1", 1);
for (auto & expr : exprs) {
// Instantiate.
auto drvPaths = std::vector<string>{};
if (!std::regex_match(expr, std::regex("^/.*\\.drv$"))) {
// If we're in a #! script, interpret filenames relative to the
// script.
if (inShebang && !packages)
expr = absPath(expr, dirOf(script));
auto instantiateArgs = Strings{"--add-root", drvLink, "--indirect"};
for (const auto & arg : instArgs)
instantiateArgs.push_back(arg);
instantiateArgs.push_back(expr);
auto instOutput = runProgram(settings.nixBinDir + "/nix-instantiate", false, instantiateArgs);
drvPaths = tokenizeString<std::vector<string>>(instOutput);
} else {
drvPaths.push_back(expr);
}
if (runEnv) {
if (drvPaths.size() != 1)
throw UsageError("a single derivation is required");
auto drvPath = drvPaths[0];
drvPath = drvPath.substr(0, drvPath.find_first_of('!'));
if (isLink(drvPath))
drvPath = readLink(drvPath);
auto drv = store->derivationFromPath(drvPath);
// Build or fetch all dependencies of the derivation.
auto nixStoreArgs = Strings{"-r", "--no-output", "--no-gc-warning"};
for (const auto & arg : buildArgs)
nixStoreArgs.push_back(arg);
for (const auto & input : drv.inputDrvs)
if (std::all_of(envExclude.cbegin(), envExclude.cend(), [&](const string & exclude) { return !std::regex_search(input.first, std::regex(exclude)); }))
nixStoreArgs.push_back(input.first);
for (const auto & src : drv.inputSrcs)
nixStoreArgs.push_back(src);
runProgram(settings.nixBinDir + "/nix-store", false, nixStoreArgs);
// Set the environment.
auto tmp = getEnv("TMPDIR", getEnv("XDG_RUNTIME_DIR", "/tmp"));
if (pure) {
auto skippedEnv = std::vector<string>{"HOME", "USER", "LOGNAME", "DISPLAY", "PATH", "TERM", "IN_NIX_SHELL", "TZ", "PAGER", "NIX_BUILD_SHELL"};
auto removed = std::vector<string>{};
for (auto i = size_t{0}; environ[i]; ++i) {
auto eq = strchr(environ[i], '=');
if (!eq)
// invalid env, just keep going
continue;
auto name = string(environ[i], eq);
if (find(skippedEnv.begin(), skippedEnv.end(), name) == skippedEnv.end())
removed.emplace_back(std::move(name));
}
for (const auto & name : removed)
unsetenv(name.c_str());
// NixOS hack: prevent /etc/bashrc from sourcing /etc/profile.
setenv("__ETC_PROFILE_SOURCED", "1", 1);
}
setenv("NIX_BUILD_TOP", tmp.c_str(), 1);
setenv("TMPDIR", tmp.c_str(), 1);
setenv("TEMPDIR", tmp.c_str(), 1);
setenv("TMP", tmp.c_str(), 1);
setenv("TEMP", tmp.c_str(), 1);
setenv("NIX_STORE", store->storeDir.c_str(), 1);
for (const auto & env : drv.env)
setenv(env.first.c_str(), env.second.c_str(), 1);
// Run a shell using the derivation's environment. For
// convenience, source $stdenv/setup to setup additional
// environment variables and shell functions. Also don't lose
// the current $PATH directories.
auto rcfile = (Path) tmpDir + "/rc";
writeFile(rcfile, (format(
"rm -rf '%1%'; "
"unset BASH_ENV; "
"[ -n \"$PS1\" ] && [ -e ~/.bashrc ] && source ~/.bashrc; "
"%2%"
"dontAddDisableDepTrack=1; "
"[ -e $stdenv/setup ] && source $stdenv/setup; "
"%3%"
"set +e; "
"[ -n \"$PS1\" ] && PS1=\"\\n\\[\\033[1;32m\\][nix-shell:\\w]$\\[\\033[0m\\] \"; "
"if [ \"$(type -t runHook)\" = function ]; then runHook shellHook; fi; "
"unset NIX_ENFORCE_PURITY; "
"unset NIX_INDENT_MAKE; "
"shopt -u nullglob; "
"unset TZ; %4%"
"%5%"
) % (Path) tmpDir % (pure ? "" : "p=$PATH") % (pure ? "" : "PATH=$PATH:$p; unset p; ") % (getenv("TZ") ? (string("export TZ='") + getenv("TZ") + "'; ") : "") % envCommand).str());
setenv("BASH_ENV", rcfile.c_str(), 1);
if (interactive)
execlp(getEnv("NIX_BUILD_SHELL", "bash").c_str(), "bash", "--rcfile", rcfile.c_str(), NULL);
else
execlp(getEnv("NIX_BUILD_SHELL", "bash").c_str(), "bash", rcfile.c_str(), NULL);
throw SysError("executing shell");
}
// Ugly hackery to make "nix-build -A foo.all" produce symlinks
// ./result, ./result-dev, and so on, rather than ./result,
// ./result-2-dev, and so on. This combines multiple derivation
// paths into one "/nix/store/drv-path!out1,out2,..." argument.
auto prevDrvPath = string{};
auto drvPaths2 = Strings{};
for (const auto & drvPath : drvPaths) {
auto p = drvPath;
auto output = string{"out"};
std::smatch match;
if (std::regex_match(drvPath, match, std::regex("(.*)!(.*)"))) {
p = match[1].str();
output = match[2].str();
}
auto target = readLink(p);
if (verbose)
std::cerr << "derivation is " << target << '\n';
if (target == prevDrvPath) {
auto last = drvPaths2.back();
drvPaths2.pop_back();
drvPaths2.push_back(last + "," + output);
} else {
drvPaths2.push_back(target + "!" + output);
prevDrvPath = target;
}
}
// Build.
auto outPaths = Strings{};
auto nixStoreArgs = Strings{"--add-root", outLink, "--indirect", "-r"};
for (const auto & arg : buildArgs)
nixStoreArgs.push_back(arg);
for (const auto & path : drvPaths2)
nixStoreArgs.push_back(path);
auto nixStoreRes = runProgram(settings.nixBinDir + "/nix-store", false, nixStoreArgs);
for (const auto & outpath : tokenizeString<std::vector<string>>(nixStoreRes)) {
outPaths.push_back(chomp(outpath));
}
if (dryRun)
continue;
for (const auto & outPath : outPaths) {
auto target = readLink(outPath);
std::cout << target << '\n';
}
}
return;
});
}