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* When checking whether a patch is applicable, for efficiency, use

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`nix-store -q --hash' to get the hash of the base path rather than
  `nix-hash'.  However, only do this for estimating the size of a
  download, not for the actual substitution, because sometimes the
  contents of store paths are modified (which they shouldn't, of
  course).
This commit is contained in:
Eelco Dolstra 2010-11-17 17:41:59 +00:00
parent 3d38a49840
commit a4f0365b2d
1 changed files with 7 additions and 3 deletions
Download patch file Download diff file Expand all files Collapse all files

10
scripts/download-using-manifests.pl.in
View file

@ -51,6 +51,7 @@ sub parseHash {
# given path. # given path.
sub computeSmallestDownload { sub computeSmallestDownload {
my $targetPath = shift; my $targetPath = shift;
my $fast = shift;
# Build a graph of all store paths that might contribute to the # Build a graph of all store paths that might contribute to the
# construction of $targetPath, and the special node "start". The # construction of $targetPath, and the special node "start". The
@ -110,8 +111,11 @@ sub computeSmallestDownload {
my ($baseHashAlgo, $baseHash) = parseHash $patch->{baseHash}; my ($baseHashAlgo, $baseHash) = parseHash $patch->{baseHash};
my $format = "--base32"; my $format = "--base32";
$format = "" if $baseHashAlgo eq "md5"; $format = "" if $baseHashAlgo eq "md5";
my $hash = `$binDir/nix-hash --type '$baseHashAlgo' $format "$patch->{basePath}"`; my $hash = $fast && $baseHashAlgo eq "sha256"
? `$binDir/nix-store -q --hash "$patch->{basePath}"`
: `$binDir/nix-hash --type '$baseHashAlgo' $format "$patch->{basePath}"`;
chomp $hash; chomp $hash;
$hash =~ s/.*://;
next if $hash ne $baseHash; next if $hash ne $baseHash;
} }
push @queue, $patch->{basePath}; push @queue, $patch->{basePath};
@ -203,7 +207,7 @@ if ($ARGV[0] eq "--query") {
print scalar @references, "\n"; print scalar @references, "\n";
print "$_\n" foreach @references; print "$_\n" foreach @references;
my @path = computeSmallestDownload $storePath; my @path = computeSmallestDownload $storePath, 1;
my $downloadSize = 0; my $downloadSize = 0;
while (scalar @path > 0) { while (scalar @path > 0) {
@ -269,7 +273,7 @@ foreach my $localPath (@{$localPathList}) {
# Compute the shortest path. # Compute the shortest path.
my @path = computeSmallestDownload $targetPath; my @path = computeSmallestDownload $targetPath, 0;
die "don't know how to produce $targetPath\n" if scalar @path == 0; die "don't know how to produce $targetPath\n" if scalar @path == 0;