e4d4969ae9
useful way to transfer the closure of a store path to another machine. These commands provide functionality previously possible through `nix-push --copy'. However, they are much more convenient in many situations (though possibly less efficient). Example: $ nix-pack-closure /nix/store/hj232g1r...-subversion-1.3.0 > svn.closure (on another machine:) $ nix-unpack-closure < svn.closure Note that Subversion is added to the store, but not installed into a user environment. One should do `nix-env -i /nix/store/hj232g1r...-subversion-1.3.0' for that. Another example: copy the application Azureus to the machine `scratchy' through ssh: $ nix-pack-closure $(which azureus) | ssh scratchy nix-unpack-closure
67 lines
1.8 KiB
Text
67 lines
1.8 KiB
Text
#! @perl@ -w
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# This tool computes the closure of a path (using "nix-store --query
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# --requisites") and puts the contents of each path in the closure in
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# a big NAR archive that can be installed on another Nix installation
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# using "nix-unpack-closure".
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# TODO: make this program "streamy", i.e., don't use a temporary
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# directory.
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use strict;
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use POSIX qw(tmpnam);
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my $binDir = $ENV{"NIX_BIN_DIR"};
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$binDir = "@bindir@" unless defined $binDir;
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my $tmpDir;
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do { $tmpDir = tmpnam(); }
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until mkdir $tmpDir, 0777;
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END { system "rm -rf '$tmpDir'"; }
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mkdir "$tmpDir/contents", 0777 or die;
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mkdir "$tmpDir/references", 0777 or die;
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mkdir "$tmpDir/derivers", 0777 or die;
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my %storePaths;
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while (@ARGV) {
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my $storePath = shift @ARGV;
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# Get the closure of this path.
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my $pid = open(READ,
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"$binDir/nix-store --query --requisites " .
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"--force-realise '$storePath'|") or die;
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while (<READ>) {
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chomp;
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die "bad: $_" unless /^\//;
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$storePaths{$_} = "";
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}
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close READ or die "nix-store failed: $?";
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}
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foreach my $storePath (sort(keys %storePaths)) {
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print STDERR "packing `$storePath'...\n";
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$storePath =~ /\/([^\/]+)$/;
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my $name = $1;
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system("$binDir/nix-store --dump '$storePath' > $tmpDir/contents/$name") == 0
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or die "nix-store --dump failed on `$storePath': $?";
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system("$binDir/nix-store --query --references '$storePath' > $tmpDir/references/$name") == 0
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or die "nix-store --query --references failed on `$storePath': $?";
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system("$binDir/nix-store --query --deriver '$storePath' > $tmpDir/derivers/$name") == 0
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or die "nix-store --query --deriver failed on `$storePath': $?";
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}
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# Write a NAR archive of everything to standard output.
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system("nix-store --dump '$tmpDir'") == 0
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or die "nix-store --dump failed";
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