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Merge branch 'buildenv-c++' of https://github.com/shlevy/nix

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This commit is contained in:
Eelco Dolstra 2016-08-11 17:11:17 +02:00
commit b0ebad88cd
8 changed files with 202 additions and 172 deletions
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3
.gitignore vendored
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@ -75,6 +75,9 @@ Makefile.config
# /src/download-via-ssh/
/src/download-via-ssh/download-via-ssh
# /src/buildenv/
/src/buildenv/buildenv
# /tests/
/tests/test-tmp
/tests/common.sh

1
Makefile
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@ -12,6 +12,7 @@ makefiles = \
src/nix-daemon/local.mk \
src/nix-collect-garbage/local.mk \
src/nix-prefetch-url/local.mk \
src/buildenv/local.mk \
perl/local.mk \
scripts/local.mk \
corepkgs/local.mk \

3
corepkgs/buildenv.nix
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@ -5,8 +5,7 @@ with import <nix/config.nix>;
derivation {
name = "user-environment";
system = builtins.currentSystem;
builder = perl;
args = [ "-w" ./buildenv.pl ];
builder = nixLibexecDir + "/nix/buildenv";
inherit manifest;

168
corepkgs/buildenv.pl
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@ -1,168 +0,0 @@
use strict;
use Cwd;
use IO::Handle;
use utf8;
STDOUT->autoflush(1);
my $out = $ENV{"out"};
mkdir "$out", 0755 || die "error creating $out";
my $symlinks = 0;
my %priorities;
# For each activated package, create symlinks.
sub createLinks {
my $srcDir = shift;
my $dstDir = shift;
my $priority = shift;
my @srcFiles = glob("$srcDir/*");
foreach my $srcFile (@srcFiles) {
my $baseName = $srcFile;
$baseName =~ s/^.*\///g; # strip directory
my $dstFile = "$dstDir/$baseName";
# The files below are special-cased so that they don't show up
# in user profiles, either because they are useless, or
# because they would cause pointless collisions (e.g., each
# Python package brings its own
# `$out/lib/pythonX.Y/site-packages/easy-install.pth'.)
# Urgh, hacky...
if ($srcFile =~ /\/propagated-build-inputs$/ ||
$srcFile =~ /\/nix-support$/ ||
$srcFile =~ /\/perllocal.pod$/ ||
$srcFile =~ /\/info\/dir$/ ||
$srcFile =~ /\/log$/)
{
# Do nothing.
}
elsif (-d $srcFile) {
lstat $dstFile;
if (-d _) {
createLinks($srcFile, $dstFile, $priority);
}
elsif (-l _) {
my $target = readlink $dstFile or die;
if (!-d $target) {
die "collision between directory ‘$srcFile’ and non-directory ‘$target’";
}
unlink $dstFile or die "error unlinking ‘$dstFile’: $!";
mkdir $dstFile, 0755 ||
die "error creating directory ‘$dstFile’: $!";
createLinks($target, $dstFile, $priorities{$dstFile});
createLinks($srcFile, $dstFile, $priority);
}
else {
symlink($srcFile, $dstFile) ||
die "error creating link ‘$dstFile’: $!";
$priorities{$dstFile} = $priority;
$symlinks++;
}
}
else {
if (-l $dstFile) {
my $target = readlink $dstFile;
my $prevPriority = $priorities{$dstFile};
die("collision between ‘$srcFile’ and ‘$target’; " .
"use ‘nix-env --set-flag priority NUMBER PKGNAME’ " .
"to change the priority of one of the conflicting packages\n")
if $prevPriority == $priority;
next if $prevPriority < $priority;
unlink $dstFile or die;
}
symlink($srcFile, $dstFile) ||
die "error creating link ‘$dstFile’: $!";
$priorities{$dstFile} = $priority;
$symlinks++;
}
}
}
my %done;
my %postponed;
sub addPkg;
sub addPkg {
my $pkgDir = shift;
my $priority = shift;
return if (defined $done{$pkgDir});
$done{$pkgDir} = 1;
# print "symlinking $pkgDir\n";
createLinks("$pkgDir", "$out", $priority);
my $propagatedFN = "$pkgDir/nix-support/propagated-user-env-packages";
if (-e $propagatedFN) {
open PROP, "<$propagatedFN" or die;
my $propagated = <PROP>;
close PROP;
my @propagated = split ' ', $propagated;
foreach my $p (@propagated) {
$postponed{$p} = 1 unless defined $done{$p};
}
}
}
# Convert the stuff we get from the environment back into a coherent
# data type.
my @pkgs;
my @derivations = split ' ', $ENV{"derivations"};
while (scalar @derivations) {
my $active = shift @derivations;
my $priority = shift @derivations;
my $outputs = shift @derivations;
for (my $n = 0; $n < $outputs; $n++) {
my $path = shift @derivations;
push @pkgs,
{ path => $path
, active => $active ne "false"
, priority => int($priority) };
}
}
# Symlink to the packages that have been installed explicitly by the
# user. Process in priority order to reduce unnecessary
# symlink/unlink steps.
@pkgs = sort { $a->{priority} <=> $b->{priority} || $a->{path} cmp $b->{path} } @pkgs;
foreach my $pkg (@pkgs) {
#print $pkg, " ", $pkgs{$pkg}->{priority}, "\n";
addPkg($pkg->{path}, $pkg->{priority}) if $pkg->{active};
}
# Symlink to the packages that have been "propagated" by packages
# installed by the user (i.e., package X declares that it wants Y
# installed as well). We do these later because they have a lower
# priority in case of collisions.
my $priorityCounter = 1000; # don't care about collisions
while (scalar(keys %postponed) > 0) {
my @pkgDirs = keys %postponed;
%postponed = ();
foreach my $pkgDir (sort @pkgDirs) {
addPkg($pkgDir, $priorityCounter++);
}
}
print STDERR "created $symlinks symlinks in user environment\n";
symlink($ENV{"manifest"}, "$out/manifest.nix") or die "cannot create manifest";

2
corepkgs/config.nix.in
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@ -3,7 +3,6 @@ let
let val = builtins.getEnv var; in
if val != "" then val else def;
in rec {
perl = "@perl@";
shell = "@bash@";
coreutils = "@coreutils@";
bzip2 = "@bzip2@";
@ -14,6 +13,7 @@ in rec {
tr = "@tr@";
nixBinDir = fromEnv "NIX_BIN_DIR" "@bindir@";
nixPrefix = "@prefix@";
nixLibexecDir = fromEnv "NIX_LIBEXEC_DIR" "@libexecdir@";
# If Nix is installed in the Nix store, then automatically add it as
# a dependency to the core packages. This ensures that they work

2
corepkgs/local.mk
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@ -1,4 +1,4 @@
corepkgs_FILES = nar.nix buildenv.nix buildenv.pl unpack-channel.nix derivation.nix fetchurl.nix imported-drv-to-derivation.nix
corepkgs_FILES = nar.nix buildenv.nix unpack-channel.nix derivation.nix fetchurl.nix imported-drv-to-derivation.nix
$(foreach file,config.nix $(corepkgs_FILES),$(eval $(call install-data-in,$(d)/$(file),$(datadir)/nix/corepkgs)))

186
src/buildenv/buildenv.cc Normal file
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@ -0,0 +1,186 @@
#include "shared.hh"
#include <sys/stat.h>
#include <sys/types.h>
#include <fcntl.h>
#include <algorithm>
using namespace nix;
typedef std::map<Path,int> Priorities;
static bool isDirectory (const Path & path)
{
struct stat st;
if (stat(path.c_str(), &st) == -1)
throw SysError(format("getting status of ‘%1%’") % path);
return S_ISDIR(st.st_mode);
}
static auto priorities = Priorities{};
static auto symlinks = 0;
/* For each activated package, create symlinks */
static void createLinks(const Path & srcDir, const Path & dstDir, int priority)
{
auto srcFiles = readDirectory(srcDir);
for (const auto & ent : srcFiles) {
if (ent.name[0] == '.')
/* not matched by glob */
continue;
const auto & srcFile = srcDir + "/" + ent.name;
auto dstFile = dstDir + "/" + ent.name;
/* The files below are special-cased to that they don't show up
* in user profiles, either because they are useless, or
* because they would cauase pointless collisions (e.g., each
* Python package brings its own
* `$out/lib/pythonX.Y/site-packages/easy-install.pth'.)
*/
if (hasSuffix(srcFile, "/propagated-build-inputs") ||
hasSuffix(srcFile, "/nix-support") ||
hasSuffix(srcFile, "/perllocal.pod") ||
hasSuffix(srcFile, "/info/dir") ||
hasSuffix(srcFile, "/log")) {
continue;
} else if (isDirectory(srcFile)) {
struct stat dstSt;
auto res = lstat(dstFile.c_str(), &dstSt);
if (res == 0) {
if (S_ISDIR(dstSt.st_mode)) {
createLinks(srcFile, dstFile, priority);
continue;
} else if (S_ISLNK(dstSt.st_mode)) {
auto target = readLink(dstFile);
if (!isDirectory(target))
throw Error(format("collision between ‘%1%’ and non-directory ‘%2%’")
% srcFile % target);
if (unlink(dstFile.c_str()) == -1)
throw SysError(format("unlinking ‘%1%’") % dstFile);
if (mkdir(dstFile.c_str(), 0755) == -1)
throw SysError(format("creating directory ‘%1%’"));
createLinks(target, dstFile, priorities[dstFile]);
createLinks(srcFile, dstFile, priority);
continue;
}
} else if (errno != ENOENT)
throw SysError(format("getting status of ‘%1%’") % dstFile);
} else {
struct stat dstSt;
auto res = lstat(dstFile.c_str(), &dstSt);
if (res == 0) {
if (S_ISLNK(dstSt.st_mode)) {
auto target = readLink(dstFile);
auto prevPriority = priorities[dstFile];
if (prevPriority == priority)
throw Error(format(
"collision between ‘%1%’ and ‘%2%’; "
"use ‘nix-env --set-flag priority NUMBER PKGNAME’ "
"to change the priority of one of the conflicting packages"
) % srcFile % target);
if (prevPriority < priority)
continue;
if (unlink(dstFile.c_str()) == -1)
throw SysError(format("unlinking ‘%1%’") % dstFile);
}
} else if (errno != ENOENT)
throw SysError(format("getting status of ‘%1%’") % dstFile);
}
createSymlink(srcFile, dstFile);
priorities[dstFile] = priority;
symlinks++;
}
}
typedef std::set<Path> FileProp;
static auto done = FileProp{};
static auto postponed = FileProp{};
static auto out = string{};
static void addPkg(const Path & pkgDir, int priority)
{
if (done.find(pkgDir) != done.end())
return;
done.insert(pkgDir);
createLinks(pkgDir, out, priority);
auto propagatedFN = pkgDir + "/nix-support/propagated-user-env-packages";
auto propagated = string{};
{
AutoCloseFD fd = open(propagatedFN.c_str(), O_RDONLY | O_CLOEXEC);
if (!fd) {
if (errno == ENOENT)
return;
throw SysError(format("opening ‘%1%’") % propagatedFN);
}
propagated = readLine(fd.get());
}
for (const auto & p : tokenizeString<std::vector<string>>(propagated, " "))
if (done.find(p) == done.end())
postponed.insert(p);
}
struct Package {
Path path;
bool active;
int priority;
Package(Path path, bool active, int priority) : path{std::move(path)}, active{active}, priority{priority} {}
};
typedef std::vector<Package> Packages;
int main(int argc, char ** argv)
{
return handleExceptions(argv[0], [&]() {
initNix();
out = getEnv("out");
if (mkdir(out.c_str(), 0755) == -1)
throw SysError(format("creating %1%") % out);
/* Convert the stuff we get from the environment back into a coherent
* data type.
*/
auto pkgs = Packages{};
auto derivations = tokenizeString<Strings>(getEnv("derivations"));
while (!derivations.empty()) {
/* !!! We're trusting the caller to structure derivations env var correctly */
auto active = derivations.front(); derivations.pop_front();
auto priority = stoi(derivations.front()); derivations.pop_front();
auto outputs = stoi(derivations.front()); derivations.pop_front();
for (auto n = 0; n < outputs; n++) {
auto path = derivations.front(); derivations.pop_front();
pkgs.emplace_back(path, active != "false", priority);
}
}
/* Symlink to the packages that have been installed explicitly by the
* user. Process in priority order to reduce unnecessary
* symlink/unlink steps.
*/
std::sort(pkgs.begin(), pkgs.end(), [](const Package & a, const Package & b) {
return a.priority < b.priority || (a.priority == b.priority && a.path < b.path);
});
for (const auto & pkg : pkgs)
if (pkg.active)
addPkg(pkg.path, pkg.priority);
/* Symlink to the packages that have been "propagated" by packages
* installed by the user (i.e., package X declares that it wants Y
* installed as well). We do these later because they have a lower
* priority in case of collisions.
*/
auto priorityCounter = 1000;
while (!postponed.empty()) {
auto pkgDirs = postponed;
postponed = FileProp{};
for (const auto & pkgDir : pkgDirs)
addPkg(pkgDir, priorityCounter++);
}
std::cerr << "created " << symlinks << " symlinks in user environment\n";
createSymlink(getEnv("manifest"), out + "/manifest.nix");
});
}

9
src/buildenv/local.mk Normal file
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@ -0,0 +1,9 @@
programs += buildenv
buildenv_DIR := $(d)
buildenv_INSTALL_DIR := $(libexecdir)/nix
buildenv_LIBS = libmain libutil libformat
buildenv_SOURCES := $(d)/buildenv.cc