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lix/scripts/nix-push.in
2011-10-10 22:40:17 +00:00

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#! @perl@ -w @perlFlags@
use strict;
use File::Temp qw(tempdir);
use File::stat;
use Nix::Config;
use Nix::Manifest;
my $hashAlgo = "sha256";
my $tmpDir = tempdir("nix-push.XXXXXX", CLEANUP => 1, TMPDIR => 1)
or die "cannot create a temporary directory";
my $nixExpr = "$tmpDir/create-nars.nix";
my $manifest = "$tmpDir/MANIFEST";
my $curl = "$Nix::Config::curl --fail --silent";
my $extraCurlFlags = ${ENV{'CURL_FLAGS'}};
$curl = "$curl $extraCurlFlags" if defined $extraCurlFlags;
my $binDir = $ENV{"NIX_BIN_DIR"} || "@bindir@";
my $dataDir = $ENV{"NIX_DATA_DIR"};
$dataDir = "@datadir@" unless defined $dataDir;
# Parse the command line.
my $localCopy;
my $localArchivesDir;
my $localManifestFile;
my $targetArchivesUrl;
my $archivesPutURL;
my $archivesGetURL;
my $manifestPutURL;
sub showSyntax {
print STDERR <<EOF
Usage: nix-push --copy ARCHIVES_DIR MANIFEST_FILE PATHS...
or: nix-push ARCHIVES_PUT_URL ARCHIVES_GET_URL MANIFEST_PUT_URL PATHS...
`nix-push' copies or uploads the closure of PATHS to the given
destination.
EOF
; # `
exit 1;
}
showSyntax if scalar @ARGV < 1;
if ($ARGV[0] eq "--copy") {
showSyntax if scalar @ARGV < 3;
$localCopy = 1;
shift @ARGV;
$localArchivesDir = shift @ARGV;
$localManifestFile = shift @ARGV;
if ($ARGV[0] eq "--target") {
shift @ARGV;
$targetArchivesUrl = shift @ARGV;
}
else {
$targetArchivesUrl = "file://$localArchivesDir";
}
}
else {
showSyntax if scalar @ARGV < 3;
$localCopy = 0;
$archivesPutURL = shift @ARGV;
$archivesGetURL = shift @ARGV;
$manifestPutURL = shift @ARGV;
}
# From the given store paths, determine the set of requisite store
# paths, i.e, the paths required to realise them.
my %storePaths;
foreach my $path (@ARGV) {
die unless $path =~ /^\//;
# Get all paths referenced by the normalisation of the given
# Nix expression.
my $pid = open(READ,
"$binDir/nix-store --query --requisites --force-realise " .
"--include-outputs '$path'|") or die;
while (<READ>) {
chomp;
die "bad: $_" unless /^\//;
$storePaths{$_} = "";
}
close READ or die "nix-store failed: $?";
}
my @storePaths = keys %storePaths;
# For each path, create a Nix expression that turns the path into
# a Nix archive.
open NIX, ">$nixExpr";
print NIX "[";
foreach my $storePath (@storePaths) {
die unless ($storePath =~ /\/[0-9a-z]{32}[^\"\\\$]*$/);
# Construct a Nix expression that creates a Nix archive.
my $nixexpr =
"((import $dataDir/nix/corepkgs/nar/nar.nix) " .
"{ storePath = builtins.storePath \"$storePath\"; system = \"@system@\"; hashAlgo = \"$hashAlgo\"; }) ";
print NIX $nixexpr;
}
print NIX "]";
close NIX;
# Instantiate store derivations from the Nix expression.
my @storeExprs;
print STDERR "instantiating store derivations...\n";
my $pid = open(READ, "$binDir/nix-instantiate $nixExpr|")
or die "cannot run nix-instantiate";
while (<READ>) {
chomp;
die unless /^\//;
push @storeExprs, $_;
}
close READ or die "nix-instantiate failed: $?";
# Build the derivations.
print STDERR "creating archives...\n";
my @narPaths;
my @tmp = @storeExprs;
while (scalar @tmp > 0) {
my $n = scalar @tmp;
if ($n > 256) { $n = 256 };
my @tmp2 = @tmp[0..$n - 1];
@tmp = @tmp[$n..scalar @tmp - 1];
my $pid = open(READ, "$binDir/nix-store --realise @tmp2|")
or die "cannot run nix-store";
while (<READ>) {
chomp;
die unless (/^\//);
push @narPaths, "$_";
}
close READ or die "nix-store failed: $?";
}
# Create the manifest.
print STDERR "creating manifest...\n";
my %narFiles;
my %patches;
my @narArchives;
for (my $n = 0; $n < scalar @storePaths; $n++) {
my $storePath = $storePaths[$n];
my $narDir = $narPaths[$n];
$storePath =~ /\/([^\/]*)$/;
my $basename = $1;
defined $basename or die;
open HASH, "$narDir/narbz2-hash" or die "cannot open narbz2-hash";
my $narbz2Hash = <HASH>;
chomp $narbz2Hash;
$narbz2Hash =~ /^[0-9a-z]+$/ or die "invalid hash";
close HASH;
my $narName = "$narbz2Hash.nar.bz2";
my $narFile = "$narDir/$narName";
(-f $narFile) or die "narfile for $storePath not found";
push @narArchives, $narFile;
my $narbz2Size = stat($narFile)->size;
my $references = `$binDir/nix-store --query --references '$storePath'`;
die "cannot query references for `$storePath'" if $? != 0;
$references = join(" ", split(" ", $references));
my $deriver = `$binDir/nix-store --query --deriver '$storePath'`;
die "cannot query deriver for `$storePath'" if $? != 0;
chomp $deriver;
$deriver = "" if $deriver eq "unknown-deriver";
my $narHash = `$binDir/nix-store --query --hash '$storePath'`;
die "cannot query hash for `$storePath'" if $? != 0;
chomp $narHash;
# In some exceptional cases (such as VM tests that use the Nix
# store of the host), the database doesn't contain the hash. So
# compute it.
if ($narHash eq "sha256:0000000000000000000000000000000000000000000000000000") {
$narHash = `$binDir/nix-hash --type sha256 '$storePath'`;
die "cannot hash `$storePath'" if $? != 0;
chomp $narHash;
$narHash = "sha256:$narHash";
}
my $narSize = `$binDir/nix-store --query --size '$storePath'`;
die "cannot query size for `$storePath'" if $? != 0;
chomp $narSize;
my $url;
if ($localCopy) {
$url = "$targetArchivesUrl/$narName";
} else {
$url = "$archivesGetURL/$narName";
}
$narFiles{$storePath} = [
{ url => $url
, hash => "$hashAlgo:$narbz2Hash"
, size => $narbz2Size
, narHash => "$narHash"
, narSize => $narSize
, references => $references
, deriver => $deriver
}
];
}
writeManifest $manifest, \%narFiles, \%patches;
sub copyFile {
my $src = shift;
my $dst = shift;
my $tmp = "$dst.tmp.$$";
system("@coreutils@/cp", $src, $tmp) == 0 or die "cannot copy file";
rename($tmp, $dst) or die "cannot rename file: $!";
}
# Upload/copy the archives.
print STDERR "uploading/copying archives...\n";
sub archiveExists {
my $name = shift;
print STDERR " HEAD on $archivesGetURL/$name\n";
return system("$curl --head $archivesGetURL/$name > /dev/null") == 0;
}
foreach my $narArchive (@narArchives) {
$narArchive =~ /\/([^\/]*)$/;
my $basename = $1;
if ($localCopy) {
# Since nix-push creates $dst atomically, if it exists we
# don't have to copy again.
my $dst = "$localArchivesDir/$basename";
if (! -f "$localArchivesDir/$basename") {
print STDERR " $narArchive\n";
copyFile $narArchive, $dst;
}
}
else {
if (!archiveExists("$basename")) {
print STDERR " $narArchive\n";
system("$curl --show-error --upload-file " .
"'$narArchive' '$archivesPutURL/$basename' > /dev/null") == 0 or
die "curl failed on $narArchive: $?";
}
}
}
# Upload the manifest.
print STDERR "uploading manifest...\n";
if ($localCopy) {
copyFile $manifest, $localManifestFile;
copyFile "$manifest.bz2", "$localManifestFile.bz2";
} else {
system("$curl --show-error --upload-file " .
"'$manifest' '$manifestPutURL' > /dev/null") == 0 or
die "curl failed on $manifest: $?";
system("$curl --show-error --upload-file " .
"'$manifest'.bz2 '$manifestPutURL'.bz2 > /dev/null") == 0 or
die "curl failed on $manifest: $?";
}