Merge pull request #522 from lethalman/nix-collect-garbage

nix-collect-garbage: translate to C++
This commit is contained in:
Eelco Dolstra 2015-04-22 19:36:52 +02:00
commit 4bbcfaf87f
5 changed files with 95 additions and 66 deletions

View file

@ -10,6 +10,7 @@ makefiles = \
src/nix-instantiate/local.mk \
src/nix-env/local.mk \
src/nix-daemon/local.mk \
src/nix-collect-garbage/local.mk \
src/download-via-ssh/local.mk \
src/nix-log2xml/local.mk \
src/bsdiff-4.3/local.mk \

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@ -1,7 +1,6 @@
nix_bin_scripts := \
$(d)/nix-build \
$(d)/nix-channel \
$(d)/nix-collect-garbage \
$(d)/nix-copy-closure \
$(d)/nix-generate-patches \
$(d)/nix-install-package \

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@ -1,65 +0,0 @@
#! @perl@ -w @perlFlags@
use strict;
use Nix::Config;
my $profilesDir = "@localstatedir@/nix/profiles";
# Process the command line arguments.
my @args = ();
my $arg;
my $removeOld = 0;
my $gen;
my $dryRun = 0;
while ($arg = shift) {
if ($arg eq "--delete-old" || $arg eq "-d") {
$removeOld = 1;
$gen = "old";
} elsif ($arg eq "--delete-older-than") {
$removeOld = 1;
$gen = shift;
} elsif ($arg eq "--dry-run") {
$dryRun = 1;
} elsif ($arg eq "--help") {
exec "man nix-collect-garbage" or die;
} else {
push @args, $arg;
}
}
# If `-d' was specified, remove all old generations of all profiles.
# Of course, this makes rollbacks to before this point in time
# impossible.
sub removeOldGenerations;
sub removeOldGenerations {
my $dir = shift;
my $dh;
opendir $dh, $dir or die;
foreach my $name (sort (readdir $dh)) {
next if $name eq "." || $name eq "..";
$name = $dir . "/" . $name;
if (-l $name && (readlink($name) =~ /link/)) {
print STDERR "removing old generations of profile $name\n";
system("$Nix::Config::binDir/nix-env", "-p", $name, "--delete-generations", $gen, $dryRun ? "--dry-run" : ());
}
elsif (! -l $name && -d $name) {
removeOldGenerations $name;
}
}
closedir $dh or die;
}
removeOldGenerations $profilesDir if $removeOld;
# Run the actual garbage collector.
exec "$Nix::Config::binDir/nix-store", "--gc", @args unless $dryRun;

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@ -0,0 +1,7 @@
programs += nix-collect-garbage
nix-collect-garbage_DIR := $(d)
nix-collect-garbage_SOURCES := $(d)/nix-collect-garbage.cc
nix-collect-garbage_LIBS = libmain libstore libutil libformat

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@ -0,0 +1,87 @@
#include "hash.hh"
#include "shared.hh"
#include "globals.hh"
#include <iostream>
using namespace nix;
std::string gen = "";
bool dryRun = false;
void runProgramSimple(Path program, const Strings & args)
{
checkInterrupt();
/* Fork. */
Pid pid = startProcess([&]() {
Strings args_(args);
args_.push_front(program);
auto cargs = stringsToCharPtrs(args_);
execv(program.c_str(), (char * *) &cargs[0]);
throw SysError(format("executing %1%") % program);
});
pid.wait(true);
}
/* If `-d' was specified, remove all old generations of all profiles.
* Of course, this makes rollbacks to before this point in time
* impossible. */
void removeOldGenerations(std::string dir)
{
for (auto & i : readDirectory(dir)) {
checkInterrupt();
auto path = dir + "/" + i.name;
auto type = getFileType(path);
if (type == DT_LNK) {
auto link = readLink(path);
if (link.find("link") != string::npos) {
printMsg(lvlInfo, format("removing old generations of profile %1%") % path);
runProgramSimple(settings.nixBinDir + "/nix-env", Strings{"-p", path, "--delete-generations", gen, dryRun ? "--dry-run" : ""});
}
} else if (type == DT_DIR) {
removeOldGenerations(path);
}
}
}
int main(int argc, char * * argv)
{
bool removeOld = false;
Strings extraArgs;
return handleExceptions(argv[0], [&]() {
initNix();
parseCmdLine(argc, argv, [&](Strings::iterator & arg, const Strings::iterator & end) {
if (*arg == "--help")
showManPage("nix-collect-garbage");
else if (*arg == "--version")
printVersion("nix-collect-garbage");
else if (*arg == "--delete-old" || *arg == "-d") removeOld = true;
else if (*arg == "--delete-older-than") {
removeOld = true;
gen = getArg(*arg, arg, end);
}
else if (*arg == "--dry-run") dryRun = true;
else
extraArgs.push_back(*arg);
return true;
});
auto profilesDir = settings.nixStateDir + "/profiles";
if (removeOld) removeOldGenerations(profilesDir);
// Run the actual garbage collector.
if (!dryRun) runProgramSimple(settings.nixBinDir + "/nix-store", Strings{"--gc"});
});
}