lix/perl/lib/Nix/Manifest.pm
Eelco Dolstra 2d9bb56e55 Fix segfault on Darwin
Ever since SQLite in Nixpkgs was updated to 3.8.0.2, Nix has randomly
segfaulted on Darwin:

  http://hydra.nixos.org/build/6175515
  http://hydra.nixos.org/build/6611038

It turns out that this is because the binary cache substituter somehow
ends up loading two versions of SQLite: the one in Nixpkgs and the
other from /usr/lib/libsqlite3.dylib.  It's not exactly clear why the
latter is loaded, but it appears to be because WWW::Curl indirectly loads
/System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation,
which in turn seems to load /usr/lib/libsqlite3.dylib.  This leads to
a segfault when Perl exits:

  #0  0x00000001010375f4 in sqlite3_finalize ()
  #1  0x000000010125806e in sqlite_st_destroy ()
  #2  0x000000010124bc30 in XS_DBD__SQLite__st_DESTROY ()
  #3  0x00000001001c8155 in XS_DBI_dispatch ()
  ...
  #14 0x0000000100023224 in perl_destruct ()
  #15 0x0000000100000d6a in main ()
  ...

The workaround is to explicitly load DBD::SQLite before WWW::Curl.
2013-10-24 19:15:52 +02:00

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package Nix::Manifest;
use strict;
use DBI;
use DBD::SQLite;
use Cwd;
use File::stat;
use File::Path;
use Fcntl ':flock';
use Nix::Config;
our @ISA = qw(Exporter);
our @EXPORT = qw(readManifest writeManifest updateManifestDB addPatch deleteOldManifests parseNARInfo);
sub addNAR {
my ($narFiles, $storePath, $info) = @_;
$$narFiles{$storePath} = []
unless defined $$narFiles{$storePath};
my $narFileList = $$narFiles{$storePath};
my $found = 0;
foreach my $narFile (@{$narFileList}) {
$found = 1 if $narFile->{url} eq $info->{url};
}
push @{$narFileList}, $info if !$found;
}
sub addPatch {
my ($patches, $storePath, $patch) = @_;
$$patches{$storePath} = []
unless defined $$patches{$storePath};
my $patchList = $$patches{$storePath};
my $found = 0;
foreach my $patch2 (@{$patchList}) {
$found = 1 if
$patch2->{url} eq $patch->{url} &&
$patch2->{basePath} eq $patch->{basePath};
}
push @{$patchList}, $patch if !$found;
return !$found;
}
sub readManifest_ {
my ($manifest, $addNAR, $addPatch) = @_;
# Decompress the manifest if necessary.
if ($manifest =~ /\.bz2$/) {
open MANIFEST, "$Nix::Config::bzip2 -d < $manifest |"
or die "cannot decompress `$manifest': $!";
} else {
open MANIFEST, "<$manifest"
or die "cannot open `$manifest': $!";
}
my $inside = 0;
my $type;
my $manifestVersion = 2;
my ($storePath, $url, $hash, $size, $basePath, $baseHash, $patchType);
my ($narHash, $narSize, $references, $deriver, $copyFrom, $system, $compressionType);
while (<MANIFEST>) {
chomp;
s/\#.*$//g;
next if (/^$/);
if (!$inside) {
if (/^\s*(\w*)\s*\{$/) {
$type = $1;
$type = "narfile" if $type eq "";
$inside = 1;
undef $storePath;
undef $url;
undef $hash;
undef $size;
undef $narHash;
undef $narSize;
undef $basePath;
undef $baseHash;
undef $patchType;
undef $system;
$references = "";
$deriver = "";
$compressionType = "bzip2";
}
} else {
if (/^\}$/) {
$inside = 0;
if ($type eq "narfile") {
&$addNAR($storePath,
{ url => $url, hash => $hash, size => $size
, narHash => $narHash, narSize => $narSize
, references => $references
, deriver => $deriver
, system => $system
, compressionType => $compressionType
});
}
elsif ($type eq "patch") {
&$addPatch($storePath,
{ url => $url, hash => $hash, size => $size
, basePath => $basePath, baseHash => $baseHash
, narHash => $narHash, narSize => $narSize
, patchType => $patchType
});
}
}
elsif (/^\s*StorePath:\s*(\/\S+)\s*$/) { $storePath = $1; }
elsif (/^\s*CopyFrom:\s*(\/\S+)\s*$/) { $copyFrom = $1; }
elsif (/^\s*Hash:\s*(\S+)\s*$/) { $hash = $1; }
elsif (/^\s*URL:\s*(\S+)\s*$/) { $url = $1; }
elsif (/^\s*Compression:\s*(\S+)\s*$/) { $compressionType = $1; }
elsif (/^\s*Size:\s*(\d+)\s*$/) { $size = $1; }
elsif (/^\s*BasePath:\s*(\/\S+)\s*$/) { $basePath = $1; }
elsif (/^\s*BaseHash:\s*(\S+)\s*$/) { $baseHash = $1; }
elsif (/^\s*Type:\s*(\S+)\s*$/) { $patchType = $1; }
elsif (/^\s*NarHash:\s*(\S+)\s*$/) { $narHash = $1; }
elsif (/^\s*NarSize:\s*(\d+)\s*$/) { $narSize = $1; }
elsif (/^\s*References:\s*(.*)\s*$/) { $references = $1; }
elsif (/^\s*Deriver:\s*(\S+)\s*$/) { $deriver = $1; }
elsif (/^\s*ManifestVersion:\s*(\d+)\s*$/) { $manifestVersion = $1; }
elsif (/^\s*System:\s*(\S+)\s*$/) { $system = $1; }
# Compatibility;
elsif (/^\s*NarURL:\s*(\S+)\s*$/) { $url = $1; }
elsif (/^\s*MD5:\s*(\S+)\s*$/) { $hash = "md5:$1"; }
}
}
close MANIFEST;
return $manifestVersion;
}
sub readManifest {
my ($manifest, $narFiles, $patches) = @_;
readManifest_($manifest,
sub { addNAR($narFiles, @_); },
sub { addPatch($patches, @_); } );
}
sub writeManifest {
my ($manifest, $narFiles, $patches, $noCompress) = @_;
open MANIFEST, ">$manifest.tmp"; # !!! check exclusive
print MANIFEST "version {\n";
print MANIFEST " ManifestVersion: 3\n";
print MANIFEST "}\n";
foreach my $storePath (sort (keys %{$narFiles})) {
my $narFileList = $$narFiles{$storePath};
foreach my $narFile (@{$narFileList}) {
print MANIFEST "{\n";
print MANIFEST " StorePath: $storePath\n";
print MANIFEST " NarURL: $narFile->{url}\n";
print MANIFEST " Compression: $narFile->{compressionType}\n";
print MANIFEST " Hash: $narFile->{hash}\n" if defined $narFile->{hash};
print MANIFEST " Size: $narFile->{size}\n" if defined $narFile->{size};
print MANIFEST " NarHash: $narFile->{narHash}\n";
print MANIFEST " NarSize: $narFile->{narSize}\n" if $narFile->{narSize};
print MANIFEST " References: $narFile->{references}\n"
if defined $narFile->{references} && $narFile->{references} ne "";
print MANIFEST " Deriver: $narFile->{deriver}\n"
if defined $narFile->{deriver} && $narFile->{deriver} ne "";
print MANIFEST " System: $narFile->{system}\n" if defined $narFile->{system};
print MANIFEST "}\n";
}
}
foreach my $storePath (sort (keys %{$patches})) {
my $patchList = $$patches{$storePath};
foreach my $patch (@{$patchList}) {
print MANIFEST "patch {\n";
print MANIFEST " StorePath: $storePath\n";
print MANIFEST " NarURL: $patch->{url}\n";
print MANIFEST " Hash: $patch->{hash}\n";
print MANIFEST " Size: $patch->{size}\n";
print MANIFEST " NarHash: $patch->{narHash}\n";
print MANIFEST " NarSize: $patch->{narSize}\n" if $patch->{narSize};
print MANIFEST " BasePath: $patch->{basePath}\n";
print MANIFEST " BaseHash: $patch->{baseHash}\n";
print MANIFEST " Type: $patch->{patchType}\n";
print MANIFEST "}\n";
}
}
close MANIFEST;
rename("$manifest.tmp", $manifest)
or die "cannot rename $manifest.tmp: $!";
# Create a bzipped manifest.
unless (defined $noCompress) {
system("$Nix::Config::bzip2 < $manifest > $manifest.bz2.tmp") == 0
or die "cannot compress manifest";
rename("$manifest.bz2.tmp", "$manifest.bz2")
or die "cannot rename $manifest.bz2.tmp: $!";
}
}
sub updateManifestDB {
my $manifestDir = $Nix::Config::manifestDir;
my @manifests = glob "$manifestDir/*.nixmanifest";
return undef if scalar @manifests == 0;
mkpath($manifestDir);
unlink "$manifestDir/cache.sqlite"; # remove obsolete cache
my $dbPath = "$manifestDir/cache-v2.sqlite";
# Open/create the database.
our $dbh = DBI->connect("dbi:SQLite:dbname=$dbPath", "", "")
or die "cannot open database `$dbPath'";
$dbh->{RaiseError} = 1;
$dbh->{PrintError} = 0;
$dbh->do("pragma foreign_keys = on");
$dbh->do("pragma synchronous = off"); # we can always reproduce the cache
$dbh->do("pragma journal_mode = truncate");
# Initialise the database schema, if necessary.
$dbh->do(<<EOF);
create table if not exists Manifests (
id integer primary key autoincrement not null,
path text unique not null,
timestamp integer not null
);
EOF
$dbh->do(<<EOF);
create table if not exists NARs (
id integer primary key autoincrement not null,
manifest integer not null,
storePath text not null,
url text not null,
compressionType text not null,
hash text,
size integer,
narHash text,
narSize integer,
refs text,
deriver text,
system text,
foreign key (manifest) references Manifests(id) on delete cascade
);
EOF
$dbh->do("create index if not exists NARs_storePath on NARs(storePath)");
$dbh->do(<<EOF);
create table if not exists Patches (
id integer primary key autoincrement not null,
manifest integer not null,
storePath text not null,
basePath text not null,
baseHash text not null,
url text not null,
hash text,
size integer,
narHash text,
narSize integer,
patchType text not null,
foreign key (manifest) references Manifests(id) on delete cascade
);
EOF
$dbh->do("create index if not exists Patches_storePath on Patches(storePath)");
# Acquire an exclusive lock to ensure that only one process
# updates the DB at the same time. This isn't really necessary,
# but it prevents work duplication and lock contention in SQLite.
my $lockFile = "$manifestDir/cache.lock";
open MAINLOCK, ">>$lockFile" or die "unable to acquire lock $lockFile: $!\n";
flock(MAINLOCK, LOCK_EX) or die;
our $insertNAR = $dbh->prepare(
"insert into NARs(manifest, storePath, url, compressionType, hash, size, narHash, " .
"narSize, refs, deriver, system) values (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)") or die;
our $insertPatch = $dbh->prepare(
"insert into Patches(manifest, storePath, basePath, baseHash, url, hash, " .
"size, narHash, narSize, patchType) values (?, ?, ?, ?, ?, ?, ?, ?, ?, ?)");
$dbh->begin_work;
# Read each manifest in $manifestDir and add it to the database,
# unless we've already done so on a previous run.
my %seen;
for my $manifestLink (@manifests) {
my $manifest = Cwd::abs_path($manifestLink);
next unless -f $manifest;
my $timestamp = lstat($manifest)->mtime;
$seen{$manifest} = 1;
next if scalar @{$dbh->selectcol_arrayref(
"select 1 from Manifests where path = ? and timestamp = ?",
{}, $manifest, $timestamp)} == 1;
print STDERR "caching $manifest...\n";
$dbh->do("delete from Manifests where path = ?", {}, $manifest);
$dbh->do("insert into Manifests(path, timestamp) values (?, ?)",
{}, $manifest, $timestamp);
our $id = $dbh->last_insert_id("", "", "", "");
sub addNARToDB {
my ($storePath, $narFile) = @_;
$insertNAR->execute(
$id, $storePath, $narFile->{url}, $narFile->{compressionType}, $narFile->{hash},
$narFile->{size}, $narFile->{narHash}, $narFile->{narSize}, $narFile->{references},
$narFile->{deriver}, $narFile->{system});
};
sub addPatchToDB {
my ($storePath, $patch) = @_;
$insertPatch->execute(
$id, $storePath, $patch->{basePath}, $patch->{baseHash}, $patch->{url},
$patch->{hash}, $patch->{size}, $patch->{narHash}, $patch->{narSize},
$patch->{patchType});
};
my $version = readManifest_($manifest, \&addNARToDB, \&addPatchToDB);
if ($version < 3) {
die "you have an old-style or corrupt manifest `$manifestLink'; please delete it\n";
}
if ($version >= 10) {
die "manifest `$manifestLink' is too new; please delete it or upgrade Nix\n";
}
}
# Removed cached information for removed manifests from the DB.
foreach my $manifest (@{$dbh->selectcol_arrayref("select path from Manifests")}) {
next if defined $seen{$manifest};
$dbh->do("delete from Manifests where path = ?", {}, $manifest);
}
$dbh->commit;
close MAINLOCK;
return $dbh;
}
# Delete all old manifests downloaded from a given URL.
sub deleteOldManifests {
my ($url, $curUrlFile) = @_;
for my $urlFile (glob "$Nix::Config::manifestDir/*.url") {
next if defined $curUrlFile && $urlFile eq $curUrlFile;
open URL, "<$urlFile" or die;
my $url2 = <URL>;
chomp $url2;
close URL;
next unless $url eq $url2;
my $base = $urlFile; $base =~ s/.url$//;
unlink "${base}.url";
unlink "${base}.nixmanifest";
}
}
# Parse a NAR info file.
sub parseNARInfo {
my ($storePath, $content) = @_;
my ($storePath2, $url, $fileHash, $fileSize, $narHash, $narSize, $deriver, $system);
my $compression = "bzip2";
my @refs;
foreach my $line (split "\n", $content) {
return undef unless $line =~ /^(.*): (.*)$/;
if ($1 eq "StorePath") { $storePath2 = $2; }
elsif ($1 eq "URL") { $url = $2; }
elsif ($1 eq "Compression") { $compression = $2; }
elsif ($1 eq "FileHash") { $fileHash = $2; }
elsif ($1 eq "FileSize") { $fileSize = int($2); }
elsif ($1 eq "NarHash") { $narHash = $2; }
elsif ($1 eq "NarSize") { $narSize = int($2); }
elsif ($1 eq "References") { @refs = split / /, $2; }
elsif ($1 eq "Deriver") { $deriver = $2; }
elsif ($1 eq "System") { $system = $2; }
}
return undef if $storePath ne $storePath2 || !defined $url || !defined $narHash;
return
{ url => $url
, compression => $compression
, fileHash => $fileHash
, fileSize => $fileSize
, narHash => $narHash
, narSize => $narSize
, refs => [ @refs ]
, deriver => $deriver
, system => $system
};
}
return 1;