62 lines
1.2 KiB
Perl
Executable File
62 lines
1.2 KiB
Perl
Executable File
#! /usr/bin/perl -w
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use strict;
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#{ my $ofh = select STDOUT;
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# $| = 1;
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# select $ofh;
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#}
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#my @paths = ("/nix/store/d49mc94xwwd7wf1xzfh4ch4cypn0ajjr-glibc-2.3.6", "/nix/store/1mgfgy3ga4m9z60747s0yzxl0g6w5kxz-glibc-2.3.6");
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my @paths = ("/nix/store");
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my $hashList = "/tmp/nix-optimise-hash-list";
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system("find @paths -type f -print0 | xargs -0 md5sum -- > $hashList") == 0
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or die "cannot hash store files";
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system("sort $hashList > $hashList.sorted") == 0
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or die "cannot sort list";
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open LIST, "<$hashList.sorted" or die;
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my $prevFile;
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my $prevHash;
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my $totalSpace = 0;
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my $savedSpace = 0;
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my $files = 0;
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while (<LIST>) {
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/^([0-9a-f]*)\s+(.*)$/ or die;
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my $curFile = $2;
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my $curHash = $1;
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my $fileSize = (stat $curFile)[7];
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$totalSpace += $fileSize;
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if (defined $prevHash && $curHash eq $prevHash) {
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print "$curFile = $prevFile\n";
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$savedSpace += $fileSize;
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} else {
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$prevFile = $curFile;
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$prevHash = $curHash;
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}
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# print "." if ($files++ % 100 == 0);
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}
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#print "\n";
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print "total space = $totalSpace\n";
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print "saved space = $savedSpace\n";
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my $savings = ($savedSpace / $totalSpace) * 100.0;
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print "savings = $savings %\n";
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close LIST;
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