nix-collect-garbage: translate to C++
This commit is contained in:
Luca Bruno
parent
4d652875bd
commit
ab2b3d6668
1
Makefile
1
Makefile
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@ -10,6 +10,7 @@ makefiles = \
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src/nix-instantiate/local.mk \
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src/nix-env/local.mk \
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src/nix-daemon/local.mk \
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src/nix-collect-garbage/local.mk \
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src/download-via-ssh/local.mk \
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src/nix-log2xml/local.mk \
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src/bsdiff-4.3/local.mk \
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@ -1,7 +1,6 @@
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nix_bin_scripts := \
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$(d)/nix-build \
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$(d)/nix-channel \
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$(d)/nix-collect-garbage \
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$(d)/nix-copy-closure \
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$(d)/nix-generate-patches \
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$(d)/nix-install-package \
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@ -1,65 +0,0 @@
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#! @perl@ -w @perlFlags@
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use strict;
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use Nix::Config;
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my $profilesDir = "@localstatedir@/nix/profiles";
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# Process the command line arguments.
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my @args = ();
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my $arg;
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my $removeOld = 0;
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my $gen;
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my $dryRun = 0;
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while ($arg = shift) {
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if ($arg eq "--delete-old" || $arg eq "-d") {
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$removeOld = 1;
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$gen = "old";
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} elsif ($arg eq "--delete-older-than") {
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$removeOld = 1;
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$gen = shift;
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} elsif ($arg eq "--dry-run") {
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$dryRun = 1;
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} elsif ($arg eq "--help") {
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exec "man nix-collect-garbage" or die;
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} else {
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push @args, $arg;
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}
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}
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# If `-d' was specified, remove all old generations of all profiles.
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# Of course, this makes rollbacks to before this point in time
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# impossible.
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sub removeOldGenerations;
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sub removeOldGenerations {
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my $dir = shift;
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my $dh;
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opendir $dh, $dir or die;
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foreach my $name (sort (readdir $dh)) {
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next if $name eq "." || $name eq "..";
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$name = $dir . "/" . $name;
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if (-l $name && (readlink($name) =~ /link/)) {
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print STDERR "removing old generations of profile $name\n";
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system("$Nix::Config::binDir/nix-env", "-p", $name, "--delete-generations", $gen, $dryRun ? "--dry-run" : ());
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}
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elsif (! -l $name && -d $name) {
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removeOldGenerations $name;
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}
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}
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closedir $dh or die;
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}
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removeOldGenerations $profilesDir if $removeOld;
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# Run the actual garbage collector.
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exec "$Nix::Config::binDir/nix-store", "--gc", @args unless $dryRun;
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@ -0,0 +1,7 @@
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programs += nix-collect-garbage
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nix-collect-garbage_DIR := $(d)
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nix-collect-garbage_SOURCES := $(d)/nix-collect-garbage.cc
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nix-collect-garbage_LIBS = libmain libstore libutil libformat
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@ -0,0 +1,87 @@
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#include "hash.hh"
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#include "shared.hh"
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#include "globals.hh"
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#include <iostream>
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using namespace nix;
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std::string gen = "";
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bool dryRun = false;
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void runProgramSimple(Path program, const Strings & args)
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{
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checkInterrupt();
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/* Fork. */
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Pid pid = startProcess([&]() {
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Strings args_(args);
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args_.push_front(program);
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auto cargs = stringsToCharPtrs(args_);
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execv(program.c_str(), (char * *) &cargs[0]);
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throw SysError(format("executing ‘%1%’") % program);
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});
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pid.wait(true);
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}
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/* If `-d' was specified, remove all old generations of all profiles.
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* Of course, this makes rollbacks to before this point in time
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* impossible. */
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void removeOldGenerations(std::string dir)
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{
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for (auto & i : readDirectory(dir)) {
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checkInterrupt();
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auto path = dir + "/" + i.name;
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auto type = getFileType(path);
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if (type == DT_LNK) {
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auto link = readLink(path);
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if (link.find("link") != string::npos) {
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printMsg(lvlInfo, format("removing old generations of profile %1%") % path);
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runProgramSimple(settings.nixBinDir + "/nix-env", Strings{"-p", path, "--delete-generations", gen, dryRun ? "--dry-run" : ""});
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}
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} else if (type == DT_DIR) {
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removeOldGenerations(path);
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}
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}
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}
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int main(int argc, char * * argv)
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{
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bool removeOld = false;
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Strings extraArgs;
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return handleExceptions(argv[0], [&]() {
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initNix();
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parseCmdLine(argc, argv, [&](Strings::iterator & arg, const Strings::iterator & end) {
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if (*arg == "--help")
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showManPage("nix-collect-garbage");
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else if (*arg == "--version")
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printVersion("nix-collect-garbage");
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else if (*arg == "--delete-old" || *arg == "-d") removeOld = true;
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else if (*arg == "--delete-older-than") {
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removeOld = true;
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gen = getArg(*arg, arg, end);
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}
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else if (*arg == "--dry-run") dryRun = true;
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else
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extraArgs.push_back(*arg);
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return true;
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});
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auto profilesDir = settings.nixStateDir + "/profiles";
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if (removeOld) removeOldGenerations(profilesDir);
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// Run the actual garbage collector.
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if (!dryRun) runProgramSimple(settings.nixBinDir + "/nix-store", Strings{"--gc"});
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});
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}
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