Allow a binary cache to declare that it doesn't support "nix-env -qas"
Querying all substitutable paths via "nix-env -qas" is potentially hard on a server, since it involves sending thousands of HEAD requests. So a binary cache must now have a meta-info file named "nix-cache-info" that specifies whether the server wants this. It also specifies the store prefix so that we don't send useless queries to a binary cache for a different store prefix.
This commit is contained in:
Eelco Dolstra
parent
6ecf4f13f6
commit
66a3ac6a56
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@ -12,18 +12,15 @@ use strict;
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Nix::Config::readConfig;
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my @binaryCacheUrls = map { s/\/+$//; $_ } split(/ /,
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($ENV{"NIX_BINARY_CACHES"}
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// $Nix::Config::config{"binary-caches"}
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// ($Nix::Config::storeDir eq "/nix/store" ? "http://nixos.org/binary-cache" : "")));
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my @caches;
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my $gotCaches = 0;
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my $maxParallelRequests = int($Nix::Config::config{"binary-caches-parallel-connections"} // 150);
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$maxParallelRequests = 1 if $maxParallelRequests < 1;
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my $debug = ($ENV{"NIX_DEBUG_SUBST"} // "") eq 1;
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my ($dbh, $insertNAR, $queryNAR, $insertNARExistence, $queryNARExistence);
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my %cacheIds;
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my ($dbh, $queryCache, $insertNAR, $queryNAR, $insertNARExistence, $queryNARExistence);
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my $curlm = WWW::Curl::Multi->new;
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my $activeRequests = 0;
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@ -112,7 +109,10 @@ sub initCache {
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$dbh->do(<<EOF);
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create table if not exists BinaryCaches (
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id integer primary key autoincrement not null,
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url text unique not null
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url text unique not null,
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timestamp integer not null,
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storeDir text not null,
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wantMassQuery integer not null
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);
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EOF
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@ -146,6 +146,8 @@ EOF
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);
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EOF
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$queryCache = $dbh->prepare("select id, storeDir, wantMassQuery from BinaryCaches where url = ?") or die;
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$insertNAR = $dbh->prepare(
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"insert or replace into NARs(cache, storePath, url, compression, fileHash, fileSize, narHash, " .
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"narSize, refs, deriver, system, timestamp) values (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)") or die;
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@ -159,35 +161,65 @@ EOF
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}
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sub getAvailableCaches {
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return if $gotCaches;
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$gotCaches = 1;
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sub negativeHit {
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my ($storePath, $binaryCacheUrl) = @_;
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$queryNARExistence->execute(getCacheId($binaryCacheUrl), basename($storePath));
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my $res = $queryNARExistence->fetchrow_hashref();
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return defined $res && $res->{exist} == 0;
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}
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my @urls = map { s/\/+$//; $_ } split(/ /,
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($ENV{"NIX_BINARY_CACHES"}
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// $Nix::Config::config{"binary-caches"}
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// ($Nix::Config::storeDir eq "/nix/store" ? "http://nixos.org/binary-cache" : "")));
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foreach my $url (@urls) {
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sub positiveHit {
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my ($storePath, $binaryCacheUrl) = @_;
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return 1 if defined getCachedInfoFrom($storePath, $binaryCacheUrl);
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$queryNARExistence->execute(getCacheId($binaryCacheUrl), basename($storePath));
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my $res = $queryNARExistence->fetchrow_hashref();
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return defined $res && $res->{exist} == 1;
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# FIXME: not atomic.
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$queryCache->execute($url);
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my $res = $queryCache->fetchrow_hashref();
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if (defined $res) {
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next if $res->{storeDir} ne $Nix::Config::storeDir;
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push @caches, { id => $res->{id}, url => $url, wantMassQuery => $res->{wantMassQuery} };
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next;
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}
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# Get the cache info file.
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my $request = addRequest(undef, $url . "/nix-cache-info");
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processRequests;
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if ($request->{result} != 0) {
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print STDERR "could not download ‘$request->{url}’ (" .
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($request->{result} != 0 ? "Curl error $request->{result}" : "HTTP status $request->{httpStatus}") . ")\n";
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next;
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}
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my $storeDir = "/nix/store";
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my $wantMassQuery = 0;
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foreach my $line (split "\n", $request->{content}) {
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unless ($line =~ /^(.*): (.*)$/) {
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print STDERR "bad cache info file ‘$request->{url}’\n";
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return undef;
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}
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if ($1 eq "StoreDir") { $storeDir = $2; }
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elsif ($1 eq "WantMassQuery") { $wantMassQuery = int($2); }
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}
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$dbh->do("insert into BinaryCaches(url, timestamp, storeDir, wantMassQuery) values (?, ?, ?, ?)",
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{}, $url, time(), $storeDir, $wantMassQuery);
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my $id = $dbh->last_insert_id("", "", "", "");
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next if $storeDir ne $Nix::Config::storeDir;
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push @caches, { id => $id, url => $url, wantMassQuery => $wantMassQuery };
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}
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}
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sub processNARInfo {
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my ($storePath, $binaryCacheUrl, $request) = @_;
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my $cacheId = getCacheId($binaryCacheUrl);
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my ($storePath, $cache, $request) = @_;
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if ($request->{result} != 0) {
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if ($request->{result} != 37 && $request->{httpStatus} != 404) {
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print STDERR "could not download ‘$request->{url}’ (" .
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($request->{result} != 0 ? "Curl error $request->{result}" : "HTTP status $request->{httpStatus}") . ")\n";
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} else {
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$insertNARExistence->execute($cacheId, basename($storePath), 0, time())
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$insertNARExistence->execute($cache->{id}, basename($storePath), 0, time())
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unless $request->{url} =~ /^file:/;
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}
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return undef;
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@ -222,7 +254,7 @@ sub processNARInfo {
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# Cache the result.
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$insertNAR->execute(
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$cacheId, basename($storePath), $url, $compression, $fileHash, $fileSize,
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$cache->{id}, basename($storePath), $url, $compression, $fileHash, $fileSize,
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$narHash, $narSize, join(" ", @refs), $deriver, $system, time())
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unless $request->{url} =~ /^file:/;
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@ -240,31 +272,10 @@ sub processNARInfo {
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}
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sub getCacheId {
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my ($binaryCacheUrl) = @_;
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my $cacheId = $cacheIds{$binaryCacheUrl};
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return $cacheId if defined $cacheId;
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# FIXME: not atomic.
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my @res = @{$dbh->selectcol_arrayref("select id from BinaryCaches where url = ?", {}, $binaryCacheUrl)};
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if (scalar @res == 1) {
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$cacheId = $res[0];
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} else {
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$dbh->do("insert into BinaryCaches(url) values (?)",
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{}, $binaryCacheUrl);
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$cacheId = $dbh->last_insert_id("", "", "", "");
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}
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$cacheIds{$binaryCacheUrl} = $cacheId;
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return $cacheId;
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}
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sub getCachedInfoFrom {
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my ($storePath, $binaryCacheUrl) = @_;
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my ($storePath, $cache) = @_;
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$queryNAR->execute(getCacheId($binaryCacheUrl), basename($storePath));
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$queryNAR->execute($cache->{id}, basename($storePath));
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my $res = $queryNAR->fetchrow_hashref();
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return undef unless defined $res;
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@ -281,6 +292,23 @@ sub getCachedInfoFrom {
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}
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sub negativeHit {
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my ($storePath, $cache) = @_;
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$queryNARExistence->execute($cache->{id}, basename($storePath));
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my $res = $queryNARExistence->fetchrow_hashref();
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return defined $res && $res->{exist} == 0;
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}
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sub positiveHit {
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my ($storePath, $cache) = @_;
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return 1 if defined getCachedInfoFrom($storePath, $cache);
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$queryNARExistence->execute($cache->{id}, basename($storePath));
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my $res = $queryNARExistence->fetchrow_hashref();
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return defined $res && $res->{exist} == 1;
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}
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sub printInfo {
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my ($storePath, $info) = @_;
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print "$storePath\n";
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@ -306,8 +334,8 @@ sub printInfoParallel {
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my @left;
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foreach my $storePath (@paths) {
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my $found = 0;
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foreach my $binaryCacheUrl (@binaryCacheUrls) {
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my $info = getCachedInfoFrom($storePath, $binaryCacheUrl);
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foreach my $cache (@caches) {
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my $info = getCachedInfoFrom($storePath, $cache);
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if (defined $info) {
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printInfo($storePath, $info);
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$found = 1;
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@ -319,22 +347,22 @@ sub printInfoParallel {
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return if scalar @left == 0;
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foreach my $binaryCacheUrl (@binaryCacheUrls) {
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foreach my $cache (@caches) {
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my @left2;
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%requests = ();
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foreach my $storePath (@left) {
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if (negativeHit($storePath, $binaryCacheUrl)) {
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if (negativeHit($storePath, $cache)) {
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push @left2, $storePath;
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next;
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}
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addRequest($storePath, infoUrl($binaryCacheUrl, $storePath));
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addRequest($storePath, infoUrl($cache->{url}, $storePath));
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}
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processRequests;
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foreach my $request (values %requests) {
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my $info = processNARInfo($request->{storePath}, $binaryCacheUrl, $request);
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my $info = processNARInfo($request->{storePath}, $cache, $request);
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if (defined $info) {
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printInfo($request->{storePath}, $info);
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} else {
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@ -354,8 +382,9 @@ sub printSubstitutablePaths {
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my @left;
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foreach my $storePath (@paths) {
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my $found = 0;
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foreach my $binaryCacheUrl (@binaryCacheUrls) {
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if (positiveHit($storePath, $binaryCacheUrl)) {
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foreach my $cache (@caches) {
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next unless $cache->{wantMassQuery};
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if (positiveHit($storePath, $cache)) {
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print "$storePath\n";
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$found = 1;
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last;
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@ -367,17 +396,16 @@ sub printSubstitutablePaths {
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return if scalar @left == 0;
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# For remaining paths, do HEAD requests.
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foreach my $binaryCacheUrl (@binaryCacheUrls) {
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my $cacheId = getCacheId($binaryCacheUrl);
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foreach my $cache (@caches) {
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next unless $cache->{wantMassQuery};
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my @left2;
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%requests = ();
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foreach my $storePath (@left) {
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if (negativeHit($storePath, $binaryCacheUrl)) {
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if (negativeHit($storePath, $cache)) {
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push @left2, $storePath;
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next;
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}
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addRequest($storePath, infoUrl($binaryCacheUrl, $storePath), 1);
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addRequest($storePath, infoUrl($cache->{url}, $storePath), 1);
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}
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processRequests;
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@ -388,12 +416,12 @@ sub printSubstitutablePaths {
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print STDERR "could not check ‘$request->{url}’ (" .
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($request->{result} != 0 ? "Curl error $request->{result}" : "HTTP status $request->{httpStatus}") . ")\n";
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} else {
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$insertNARExistence->execute($cacheId, basename($request->{storePath}), 0, time())
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$insertNARExistence->execute($cache->{id}, basename($request->{storePath}), 0, time())
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unless $request->{url} =~ /^file:/;
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}
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push @left2, $request->{storePath};
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} else {
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$insertNARExistence->execute($cacheId, basename($request->{storePath}), 1, time())
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$insertNARExistence->execute($cache->{id}, basename($request->{storePath}), 1, time())
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unless $request->{url} =~ /^file:/;
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print "$request->{storePath}\n";
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}
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@ -407,14 +435,14 @@ sub printSubstitutablePaths {
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sub downloadBinary {
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my ($storePath) = @_;
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foreach my $binaryCacheUrl (@binaryCacheUrls) {
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my $info = getCachedInfoFrom($storePath, $binaryCacheUrl);
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foreach my $cache (@caches) {
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my $info = getCachedInfoFrom($storePath, $cache);
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unless (defined $info) {
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next if negativeHit($storePath, $binaryCacheUrl);
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my $request = addRequest($storePath, infoUrl($binaryCacheUrl, $storePath));
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next if negativeHit($storePath, $cache);
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my $request = addRequest($storePath, infoUrl($cache->{url}, $storePath));
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processRequests;
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$info = processNARInfo($storePath, $binaryCacheUrl, $request);
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$info = processNARInfo($storePath, $cache, $request);
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}
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next unless defined $info;
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@ -426,7 +454,7 @@ sub downloadBinary {
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print STDERR "unknown compression method ‘$info->{compression}’\n";
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next;
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}
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my $url = "$binaryCacheUrl/$info->{url}"; # FIXME: handle non-relative URLs
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my $url = "$cache->{url}/$info->{url}"; # FIXME: handle non-relative URLs
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print STDERR "\n*** Downloading ‘$url’ into ‘$storePath’...\n";
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if (system("$Nix::Config::curl --fail --location --insecure '$url' | $decompressor | $Nix::Config::binDir/nix-store --restore $storePath") != 0) {
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die "download of `$info->{url}' failed" . ($! ? ": $!" : "") . "\n" unless $? == 0;
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@ -437,10 +465,10 @@ sub downloadBinary {
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print "$info->{narHash}\n";
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print STDERR "\n";
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return 1;
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return;
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}
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return 0;
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print STDERR "could not download ‘$storePath’ from any binary cache\n";
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}
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@ -450,6 +478,7 @@ initCache();
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if ($ARGV[0] eq "--query") {
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while (<STDIN>) {
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getAvailableCaches;
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chomp;
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my ($cmd, @args) = split " ", $_;
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@ -472,9 +501,8 @@ if ($ARGV[0] eq "--query") {
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elsif ($ARGV[0] eq "--substitute") {
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my $storePath = $ARGV[1] or die;
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if (!downloadBinary($storePath)) {
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print STDERR "could not download ‘$storePath’ from any binary cache\n";
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}
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getAvailableCaches;
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downloadBinary($storePath);
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}
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else {
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@ -125,7 +125,17 @@ while (<READ>) {
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close READ or die "nix-build failed: $?";
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# Copy the archives and the corresponding info files.
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# Write the cache info file.
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my $cacheInfoFile = "$destDir/nix-cache-info";
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if (! -e $cacheInfoFile) {
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open FILE, ">$cacheInfoFile" or die "cannot create $cacheInfoFile: $!";
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print FILE "StoreDir: $Nix::Config::storeDir\n";
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print FILE "WantMassQuery: 0\n"; # by default, don't hit this cache for "nix-env -qas"
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close FILE;
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}
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# Copy the archives and the corresponding NAR info files.
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print STDERR "copying archives...\n";
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my $totalNarSize = 0;
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@ -230,6 +240,4 @@ printf STDERR "total compressed size %.2f MiB, %.1f%%\n",
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# Optionally write a manifest.
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if ($writeManifest) {
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writeManifest "$destDir/MANIFEST", \%narFiles, \();
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}
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writeManifest "$destDir/MANIFEST", \%narFiles, \() if $writeManifest;
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@ -10,13 +10,26 @@ outPath=$(nix-build dependencies.nix --no-out-link)
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nix-push --dest $cacheDir $outPath
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# Check that downloading works.
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# By default, a binary cache doesn't support "nix-env -qas", but does
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# support installation.
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clearStore
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rm -f $NIX_STATE_DIR/binary-cache*
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NIX_BINARY_CACHES="file://$cacheDir" nix-env -f dependencies.nix -qas \* | grep -- "---"
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NIX_BINARY_CACHES="file://$cacheDir" nix-store -r $outPath
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# But with the right configuration, "nix-env -qas" should also work.
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clearStore
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rm -f $NIX_STATE_DIR/binary-cache*
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echo "WantMassQuery: 1" >> $cacheDir/nix-cache-info
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NIX_BINARY_CACHES="file://$cacheDir" nix-env -f dependencies.nix -qas \* | grep -- "--S"
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NIX_BINARY_CACHES="file://$cacheDir" nix-store -r $outPath
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nix-store --check-validity $outPath
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nix-store -qR $outPath | grep input-2
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