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* Fix the copy-from-other-stores substituter.

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This commit is contained in:
Eelco Dolstra 2010-04-26 13:39:55 +00:00
parent ef337f7089
commit c778ed1768
1 changed files with 23 additions and 33 deletions
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56
scripts/copy-from-other-stores.pl.in
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@ -17,25 +17,19 @@ foreach my $dir (@remoteStoresAll) {
}
$ENV{"NIX_REMOTE"} = "";
sub findStorePath {
my $storePath = shift;
my $storePathName = basename $storePath;
foreach my $store (@remoteStores) {
# Determine whether $storePath exists by looking for the
# existence of the info file, and if so, get store path info
# from that file. This rather breaks abstraction: we should
# be using `nix-store' for that. But right now there is no
# good way to tell nix-store to access a store mounted under a
# different location (there's $NIX_STORE, but that only works
# if the remote store is mounted under its "real" location).
my $infoFile = "$store/var/nix/db/info/$storePathName";
my $storePath2 = "$store/store/$storePathName";
if (-f $infoFile && -e $storePath2) {
return ($infoFile, $storePath2);
}
my $sourcePath = "$store/store/" . basename $storePath;
next unless -e $sourcePath || -l $sourcePath;
$ENV{"NIX_DB_DIR"} = "$store/var/nix/db";
return ($store, $sourcePath) if
system("@bindir@/nix-store --check-validity $storePath") == 0;
}
return undef;
}
@ -46,32 +40,28 @@ if ($ARGV[0] eq "--query") {
if ($cmd eq "have") {
my $storePath = <STDIN>; chomp $storePath;
(my $infoFile) = findStorePath $storePath;
print STDOUT ($infoFile ? "1\n" : "0\n");
print STDOUT (defined findStorePath($storePath) ? "1\n" : "0\n");
}
elsif ($cmd eq "info") {
my $storePath = <STDIN>; chomp $storePath;
(my $infoFile) = findStorePath $storePath;
if (!$infoFile) {
my ($store, $sourcePath) = findStorePath($storePath);
if (!defined $store) {
print "0\n";
next; # not an error
}
print "1\n";
my $deriver = "";
my @references = ();
$ENV{"NIX_DB_DIR"} = "$store/var/nix/db";
my $deriver = `@bindir@/nix-store --query --deriver $storePath`;
die "cannot query deriver of `$storePath'" if $? != 0;
chomp $deriver;
$deriver = "" if $deriver eq "unknown-deriver";
open INFO, "<$infoFile" or die "cannot read info file $infoFile\n";
while (<INFO>) {
chomp;
/^([\w-]+): (.*)$/ or die "bad info file";
my $key = $1;
my $value = $2;
if ($key eq "Deriver") { $deriver = $value; }
elsif ($key eq "References") { @references = split ' ', $value; }
}
close INFO;
my @references = split "\n",
`@bindir@/nix-store --query --references $storePath`;
die "cannot query references of `$storePath'" if $? != 0;
print "$deriver\n";
print scalar @references, "\n";
@ -87,8 +77,8 @@ if ($ARGV[0] eq "--query") {
elsif ($ARGV[0] eq "--substitute") {
die unless scalar @ARGV == 2;
my $storePath = $ARGV[1];
(my $infoFile, my $sourcePath) = findStorePath $storePath;
die unless $infoFile;
my ($store, $sourcePath) = findStorePath $storePath;
die unless $store;
print "\n*** Copying `$storePath' from `$sourcePath'\n\n";
system("$binDir/nix-store --dump $sourcePath | $binDir/nix-store --restore $storePath") == 0
or die "cannot copy `$sourcePath' to `$storePath'";