* In the download size indication, take binary patches into account.
Hopefully this doesn't slow things down too much.
This commit is contained in:
Eelco Dolstra
parent
f69626ed3e
commit
3d38a49840
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@ -31,6 +31,144 @@ for my $manifest (glob "$manifestDir/*.nixmanifest") {
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}
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sub isValidPath {
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my $p = shift;
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return system("$binDir/nix-store --check-validity '$p' 2> /dev/null") == 0;
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}
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sub parseHash {
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my $hash = shift;
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if ($hash =~ /^(.+):(.+)$/) {
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return ($1, $2);
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} else {
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return ("md5", $hash);
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}
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}
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# Compute the most efficient sequence of downloads to produce the
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# given path.
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sub computeSmallestDownload {
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my $targetPath = shift;
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# Build a graph of all store paths that might contribute to the
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# construction of $targetPath, and the special node "start". The
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# edges are either patch operations, or downloads of full NAR
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# files. The latter edges only occur between "start" and a store
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# path.
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my %graph;
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$graph{"start"} = {d => 0, pred => undef, edges => []};
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my @queue = ();
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my $queueFront = 0;
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my %done;
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sub addNode {
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my $graph = shift;
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my $u = shift;
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$$graph{$u} = {d => 999999999999, pred => undef, edges => []}
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unless defined $$graph{$u};
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}
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sub addEdge {
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my $graph = shift;
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my $u = shift;
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my $v = shift;
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my $w = shift;
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my $type = shift;
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my $info = shift;
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addNode $graph, $u;
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push @{$$graph{$u}->{edges}},
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{weight => $w, start => $u, end => $v, type => $type, info => $info};
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my $n = scalar @{$$graph{$u}->{edges}};
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}
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push @queue, $targetPath;
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while ($queueFront < scalar @queue) {
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my $u = $queue[$queueFront++];
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return if defined $done{$u};
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$done{$u} = 1;
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addNode \%graph, $u;
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# If the path already exists, it has distance 0 from the
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# "start" node.
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if (isValidPath($u)) {
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addEdge \%graph, "start", $u, 0, "present", undef;
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}
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else {
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# Add patch edges.
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my $patchList = $patches{$u};
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foreach my $patch (@{$patchList}) {
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if (isValidPath($patch->{basePath})) {
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# !!! this should be cached
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my ($baseHashAlgo, $baseHash) = parseHash $patch->{baseHash};
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my $format = "--base32";
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$format = "" if $baseHashAlgo eq "md5";
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my $hash = `$binDir/nix-hash --type '$baseHashAlgo' $format "$patch->{basePath}"`;
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chomp $hash;
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next if $hash ne $baseHash;
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}
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push @queue, $patch->{basePath};
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addEdge \%graph, $patch->{basePath}, $u, $patch->{size}, "patch", $patch;
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}
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# Add NAR file edges to the start node.
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my $narFileList = $narFiles{$u};
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foreach my $narFile (@{$narFileList}) {
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# !!! how to handle files whose size is not known in advance?
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# For now, assume some arbitrary size (1 MB).
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addEdge \%graph, "start", $u, ($narFile->{size} || 1000000), "narfile", $narFile;
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}
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}
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}
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# Run Dijkstra's shortest path algorithm to determine the shortest
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# sequence of download and/or patch actions that will produce
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# $targetPath.
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my @todo = keys %graph;
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while (scalar @todo > 0) {
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# Remove the closest element from the todo list.
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# !!! inefficient, use a priority queue
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@todo = sort { -($graph{$a}->{d} <=> $graph{$b}->{d}) } @todo;
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my $u = pop @todo;
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my $u_ = $graph{$u};
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foreach my $edge (@{$u_->{edges}}) {
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my $v_ = $graph{$edge->{end}};
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if ($v_->{d} > $u_->{d} + $edge->{weight}) {
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$v_->{d} = $u_->{d} + $edge->{weight};
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# Store the edge; to edge->start is actually the
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# predecessor.
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$v_->{pred} = $edge;
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}
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}
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}
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# Retrieve the shortest path from "start" to $targetPath.
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my @path = ();
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my $cur = $targetPath;
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return () unless defined $graph{$targetPath}->{pred};
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while ($cur ne "start") {
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push @path, $graph{$cur}->{pred};
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$cur = $graph{$cur}->{pred}->{start};
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}
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return @path;
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}
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# Parse the arguments.
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if ($ARGV[0] eq "--query") {
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@ -46,6 +184,7 @@ if ($ARGV[0] eq "--query") {
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elsif ($cmd eq "info") {
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my $storePath = <STDIN>; chomp $storePath;
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my $info;
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if (defined $narFiles{$storePath}) {
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$info = @{$narFiles{$storePath}}[0];
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@ -57,13 +196,30 @@ if ($ARGV[0] eq "--query") {
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print "0\n";
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next; # not an error
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}
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print "1\n";
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print "$info->{deriver}\n";
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my @references = split " ", $info->{references};
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print scalar @references, "\n";
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print "$_\n" foreach @references;
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my $size = $info->{size} || 0;
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print "$size\n";
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my @path = computeSmallestDownload $storePath;
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my $downloadSize = 0;
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while (scalar @path > 0) {
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my $edge = pop @path;
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my $u = $edge->{start};
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my $v = $edge->{end};
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if ($edge->{type} eq "patch") {
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$downloadSize += $edge->{info}->{size};
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}
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elsif ($edge->{type} eq "narfile") {
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$downloadSize += $edge->{info}->{size};
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}
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}
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print "$downloadSize\n";
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my $narSize = $info->{narSize} || 0;
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print "$narSize\n";
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}
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@ -112,148 +268,9 @@ foreach my $localPath (@{$localPathList}) {
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}
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# Build a graph of all store paths that might contribute to the
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# construction of $targetPath, and the special node "start". The
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# edges are either patch operations, or downloads of full NAR files.
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# The latter edges only occur between "start" and a store path.
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my %graph;
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$graph{"start"} = {d => 0, pred => undef, edges => []};
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my @queue = ();
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my $queueFront = 0;
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my %done;
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sub addToQueue {
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my $v = shift;
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return if defined $done{$v};
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$done{$v} = 1;
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push @queue, $v;
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}
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sub addNode {
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my $u = shift;
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$graph{$u} = {d => 999999999999, pred => undef, edges => []}
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unless defined $graph{$u};
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}
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sub addEdge {
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my $u = shift;
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my $v = shift;
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my $w = shift;
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my $type = shift;
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my $info = shift;
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addNode $u;
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push @{$graph{$u}->{edges}},
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{weight => $w, start => $u, end => $v, type => $type, info => $info};
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my $n = scalar @{$graph{$u}->{edges}};
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}
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addToQueue $targetPath;
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sub isValidPath {
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my $p = shift;
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return system("$binDir/nix-store --check-validity '$p' 2> /dev/null") == 0;
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}
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sub parseHash {
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my $hash = shift;
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if ($hash =~ /^(.+):(.+)$/) {
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return ($1, $2);
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} else {
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return ("md5", $hash);
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}
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}
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while ($queueFront < scalar @queue) {
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my $u = $queue[$queueFront++];
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# print "$u\n";
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addNode $u;
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# If the path already exists, it has distance 0 from the "start"
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# node.
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if (isValidPath($u)) {
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addEdge "start", $u, 0, "present", undef;
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}
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else {
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# Add patch edges.
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my $patchList = $patches{$u};
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foreach my $patch (@{$patchList}) {
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if (isValidPath($patch->{basePath})) {
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# !!! this should be cached
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my ($baseHashAlgo, $baseHash) = parseHash $patch->{baseHash};
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my $format = "--base32";
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$format = "" if $baseHashAlgo eq "md5";
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my $hash = `$binDir/nix-hash --type '$baseHashAlgo' $format "$patch->{basePath}"`;
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chomp $hash;
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if ($hash ne $baseHash) {
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print LOGFILE "$$ rejecting $patch->{basePath}\n";
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next;
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}
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}
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addToQueue $patch->{basePath};
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addEdge $patch->{basePath}, $u, $patch->{size}, "patch", $patch;
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}
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# Add NAR file edges to the start node.
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my $narFileList = $narFiles{$u};
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foreach my $narFile (@{$narFileList}) {
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# !!! how to handle files whose size is not known in advance?
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# For now, assume some arbitrary size (1 MB).
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addEdge "start", $u, ($narFile->{size} || 1000000), "narfile", $narFile;
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if ($u eq $targetPath) {
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my $size = $narFile->{size} || -1;
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print LOGFILE "$$ full-download-would-be $size\n";
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}
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}
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}
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}
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# Run Dijkstra's shortest path algorithm to determine the shortest
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# sequence of download and/or patch actions that will produce
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# $targetPath.
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sub byDistance { # sort by distance, reversed
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return -($graph{$a}->{d} <=> $graph{$b}->{d});
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}
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my @todo = keys %graph;
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while (scalar @todo > 0) {
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# Remove the closest element from the todo list.
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@todo = sort byDistance @todo;
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my $u = pop @todo;
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my $u_ = $graph{$u};
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foreach my $edge (@{$u_->{edges}}) {
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my $v_ = $graph{$edge->{end}};
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if ($v_->{d} > $u_->{d} + $edge->{weight}) {
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$v_->{d} = $u_->{d} + $edge->{weight};
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# Store the edge; to edge->start is actually the
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# predecessor.
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$v_->{pred} = $edge;
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}
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}
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}
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# Retrieve the shortest path from "start" to $targetPath.
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my @path = ();
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my $cur = $targetPath;
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die "don't know how to produce $targetPath\n"
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unless defined $graph{$targetPath}->{pred};
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while ($cur ne "start") {
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push @path, $graph{$cur}->{pred};
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$cur = $graph{$cur}->{pred}->{start};
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}
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# Compute the shortest path.
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my @path = computeSmallestDownload $targetPath;
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die "don't know how to produce $targetPath\n" if scalar @path == 0;
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# Traverse the shortest path, perform the actions described by the
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@ -9,7 +9,7 @@ mkDerivation {
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mkdir $out
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seq 1 1000000 > $out/foo
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${if version == 2 then ''
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echo bla >> $out/foo
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seq 1000000 1010000 >> $out/foo
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'' else ""}
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'';
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}
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@ -1,5 +1,7 @@
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source common.sh
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clearManifests
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mkdir -p $TEST_ROOT/cache2 $TEST_ROOT/patches
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RESULT=$TEST_ROOT/result
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@ -29,5 +31,9 @@ $NIX_BIN_DIR/nix-pull file://$TEST_ROOT/manifest2
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# To make sure that we're using the patch, delete the full NARs.
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rm -f $TEST_ROOT/cache2/*
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# Make sure that the download size prediction uses the patch rather
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# than the full download.
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$nixbuild -o $RESULT binary-patching.nix --arg version 2 --dry-run 2>&1 | grep -q "0.01 MiB"
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# Now rebuild it. This should use the patch generated above.
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$nixbuild -o $RESULT binary-patching.nix --arg version 2
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