* Cache the manifests in /nix/var/nix/manifests in a SQLite database.
This significantly speeds up the download-using-manifests substituter, especially if manifests are very large. For instance, one "nix-build -A geeqie" operation that updated four packages using binary patches went from 18.5s to 1.6s. It also significantly reduces memory use. The cache is kept in /nix/var/nix/manifests/cache.sqlite. It's updated automatically when manifests are added to or removed from /nix/var/nix/manifests. It might be interesting to have nix-pull store manifests directly in the DB, rather than storing them as separate flat files, but then we would need a command line interface to delete manifests from the DB.
This commit is contained in:
Eelco Dolstra
parent
1e7e4f21ba
commit
5591fcc529
2 changed files with 164 additions and 30 deletions
|
|
@ -1,4 +1,7 @@
|
|||
use strict;
|
||||
use DBI;
|
||||
use Cwd;
|
||||
use File::stat;
|
||||
|
||||
|
||||
sub addPatch {
|
||||
|
|
@ -34,7 +37,7 @@ sub readManifest {
|
|||
my $manifestVersion = 2;
|
||||
|
||||
my ($storePath, $url, $hash, $size, $basePath, $baseHash, $patchType);
|
||||
my ($narHash, $narSize, $references, $deriver, $hashAlgo, $copyFrom, $system);
|
||||
my ($narHash, $narSize, $references, $deriver, $copyFrom, $system);
|
||||
|
||||
while (<MANIFEST>) {
|
||||
chomp;
|
||||
|
|
@ -59,7 +62,6 @@ sub readManifest {
|
|||
undef $system;
|
||||
$references = "";
|
||||
$deriver = "";
|
||||
$hashAlgo = "md5";
|
||||
}
|
||||
|
||||
} else {
|
||||
|
|
@ -83,7 +85,7 @@ sub readManifest {
|
|||
{ url => $url, hash => $hash, size => $size
|
||||
, narHash => $narHash, narSize => $narSize
|
||||
, references => $references
|
||||
, deriver => $deriver, hashAlgo => $hashAlgo
|
||||
, deriver => $deriver
|
||||
, system => $system
|
||||
};
|
||||
}
|
||||
|
|
@ -95,7 +97,7 @@ sub readManifest {
|
|||
{ url => $url, hash => $hash, size => $size
|
||||
, basePath => $basePath, baseHash => $baseHash
|
||||
, narHash => $narHash, narSize => $narSize
|
||||
, patchType => $patchType, hashAlgo => $hashAlgo
|
||||
, patchType => $patchType
|
||||
};
|
||||
}
|
||||
|
||||
|
|
@ -193,4 +195,136 @@ sub writeManifest {
|
|||
}
|
||||
|
||||
|
||||
sub updateManifestDB {
|
||||
my $manifestDir = ($ENV{"NIX_MANIFESTS_DIR"} or "@localstatedir@/nix/manifests");
|
||||
|
||||
my $dbPath = "$manifestDir/cache.sqlite";
|
||||
|
||||
# Open/create the database.
|
||||
my $dbh = DBI->connect("dbi:SQLite:dbname=$dbPath", "", "")
|
||||
or die "cannot open database `$dbPath'";
|
||||
$dbh->{AutoCommit} = 0;
|
||||
$dbh->{RaiseError} = 1;
|
||||
$dbh->{PrintError} = 0;
|
||||
|
||||
$dbh->do("pragma foreign_keys = on");
|
||||
|
||||
# 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,
|
||||
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)");
|
||||
|
||||
# !!! locking?
|
||||
|
||||
# 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 $manifest (glob "$manifestDir/*.nixmanifest") {
|
||||
$manifest = Cwd::abs_path($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;
|
||||
|
||||
# !!! Insert directly into the DB.
|
||||
my %narFiles;
|
||||
my %patches;
|
||||
my $version = readManifest($manifest, \%narFiles, \%patches);
|
||||
|
||||
if ($version < 3) {
|
||||
die "you have an old-style manifest `$manifest'; please delete it";
|
||||
}
|
||||
if ($version >= 10) {
|
||||
die "manifest `$manifest' is too new; please delete it or upgrade Nix";
|
||||
}
|
||||
|
||||
$dbh->do("delete from Manifests where path = ?", {}, $manifest);
|
||||
|
||||
$dbh->do("insert into Manifests(path, timestamp) values (?, ?)",
|
||||
{}, $manifest, $timestamp);
|
||||
|
||||
my $id = $dbh->sqlite_last_insert_rowid();
|
||||
|
||||
foreach my $storePath (keys %narFiles) {
|
||||
my $narFileList = $narFiles{$storePath};
|
||||
foreach my $narFile (@{$narFiles{$storePath}}) {
|
||||
$dbh->do(
|
||||
"insert into NARs(manifest, storePath, url, hash, size, narHash, " .
|
||||
"narSize, refs, deriver, system) values (?, ?, ?, ?, ?, ?, ?, ?, ?, ?)",
|
||||
{}, $id, $storePath, $narFile->{url}, $narFile->{hash}, $narFile->{size},
|
||||
$narFile->{narHash}, $narFile->{narSize}, $narFile->{references},
|
||||
$narFile->{deriver}, $narFile->{system});
|
||||
}
|
||||
}
|
||||
|
||||
foreach my $storePath (keys %patches) {
|
||||
my $patchList = $patches{$storePath};
|
||||
foreach my $patch (@{$patchList}) {
|
||||
$dbh->do(
|
||||
"insert into Patches(manifest, storePath, basePath, baseHash, url, hash, " .
|
||||
"size, narHash, narSize, patchType) values (?, ?, ?, ?, ?, ?, ?, ?, ?, ?)",
|
||||
{}, $id, $storePath, $patch->{basePath}, $patch->{baseHash}, $patch->{url},
|
||||
$patch->{hash}, $patch->{size}, $patch->{narHash}, $patch->{narSize},
|
||||
$patch->{patchType});
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
# 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;
|
||||
|
||||
return $dbh;
|
||||
}
|
||||
|
||||
|
||||
return 1;
|
||||
|
|
|
|||
|
|
@ -17,21 +17,8 @@ my $logFile = "@localstatedir@/log/nix/downloads";
|
|||
my $fast = 1;
|
||||
|
||||
|
||||
# Load all manifests.
|
||||
my %narFiles;
|
||||
my %patches;
|
||||
|
||||
for my $manifest (glob "$manifestDir/*.nixmanifest") {
|
||||
my $version = readManifest($manifest, \%narFiles, \%patches);
|
||||
if ($version < 3) {
|
||||
print STDERR "you have an old-style manifest `$manifest'; please delete it\n";
|
||||
exit 1;
|
||||
}
|
||||
if ($version >= 10) {
|
||||
print STDERR "manifest `$manifest' is too new; please delete it or upgrade Nix\n";
|
||||
exit 1;
|
||||
}
|
||||
}
|
||||
# Open the manifest cache and update it if necessary.
|
||||
my $dbh = updateManifestDB();
|
||||
|
||||
|
||||
sub isValidPath {
|
||||
|
|
@ -110,7 +97,10 @@ sub computeSmallestDownload {
|
|||
else {
|
||||
|
||||
# Add patch edges.
|
||||
my $patchList = $patches{$u};
|
||||
my $patchList = $dbh->selectall_arrayref(
|
||||
"select * from Patches where storePath = ?",
|
||||
{ Slice => {} }, $u);
|
||||
|
||||
foreach my $patch (@{$patchList}) {
|
||||
if (isValidPath($patch->{basePath})) {
|
||||
# !!! this should be cached
|
||||
|
|
@ -129,11 +119,15 @@ sub computeSmallestDownload {
|
|||
}
|
||||
|
||||
# Add NAR file edges to the start node.
|
||||
my $narFileList = $narFiles{$u};
|
||||
my $narFileList = $dbh->selectall_arrayref(
|
||||
"select * from NARs where storePath = ?",
|
||||
{ Slice => {} }, $u);
|
||||
|
||||
foreach my $narFile (@{$narFileList}) {
|
||||
# !!! how to handle files whose size is not known in advance?
|
||||
# For now, assume some arbitrary size (1 MB).
|
||||
addEdge \%graph, "start", $u, ($narFile->{size} || 1000000), "narfile", $narFile;
|
||||
# For now, assume some arbitrary size (1 GB).
|
||||
# This has the side-effect of preferring non-Hydra downloads.
|
||||
addEdge \%graph, "start", $u, ($narFile->{size} || 1000000000), "narfile", $narFile;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
|
@ -188,15 +182,21 @@ if ($ARGV[0] eq "--query") {
|
|||
|
||||
if ($cmd eq "have") {
|
||||
my $storePath = <STDIN>; chomp $storePath;
|
||||
print STDOUT (defined $narFiles{$storePath} ? "1\n" : "0\n");
|
||||
print STDOUT (
|
||||
scalar @{$dbh->selectcol_arrayref("select 1 from NARs where storePath = ?", {}, $storePath)} > 0
|
||||
? "1\n" : "0\n");
|
||||
}
|
||||
|
||||
elsif ($cmd eq "info") {
|
||||
my $storePath = <STDIN>; chomp $storePath;
|
||||
|
||||
my $infos = $dbh->selectall_arrayref(
|
||||
"select * from NARs where storePath = ?",
|
||||
{ Slice => {} }, $storePath);
|
||||
|
||||
my $info;
|
||||
if (defined $narFiles{$storePath}) {
|
||||
$info = @{$narFiles{$storePath}}[0];
|
||||
if (scalar @{$infos} > 0) {
|
||||
$info = @{$infos}[0];
|
||||
}
|
||||
else {
|
||||
print "0\n";
|
||||
|
|
@ -205,7 +205,7 @@ if ($ARGV[0] eq "--query") {
|
|||
|
||||
print "1\n";
|
||||
print "$info->{deriver}\n";
|
||||
my @references = split " ", $info->{references};
|
||||
my @references = split " ", $info->{refs};
|
||||
print scalar @references, "\n";
|
||||
print "$_\n" foreach @references;
|
||||
|
||||
|
|
|
|||
Loading…
Add table
Add a link
Reference in a new issue