find-runtime-roots: fold into gc.cc
This commit is contained in:
Shea Levy
parent
06068b353d
commit
3c46fe62b8
4 changed files with 110 additions and 88 deletions
3
.gitignore
vendored
3
.gitignore
vendored
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@ -60,6 +60,7 @@ Makefile.config
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# /src/libstore/
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/src/libstore/schema.sql.hh
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/src/libstore/sandbox-defaults.sb
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# /src/nix-env/
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/src/nix-env/nix-env
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@ -94,6 +95,8 @@ Makefile.config
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/misc/systemd/nix-daemon.socket
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/misc/upstart/nix-daemon.conf
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inst/
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*.a
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*.o
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*.so
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@ -1,79 +0,0 @@
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#! @perl@ -w @perlFlags@
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use strict;
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use Nix::Utils;
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use Nix::Config;
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sub readProc {
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return unless -d "/proc";
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opendir DIR, "/proc" or return;
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foreach my $name (readdir DIR) {
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next unless $name =~ /^\d+$/;
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my $process = "/proc/$name";
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#print STDERR "=== $process\n";
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my $target;
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print "$target\n" if $target = readlink "$process/exe";
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print "$target\n" if $target = readlink "$process/cwd";
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if (opendir FDS, "$process/fd") {
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foreach my $name (readdir FDS) {
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$target = readlink "$process/fd/$name";
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print "$target\n" if $target && substr($target, 0, 1) eq "/";
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}
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closedir FDS;
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}
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if (open MAP, "<$process/maps") {
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while (<MAP>) {
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next unless /^ \s* \S+ \s+ \S+ \s+ \S+ \s+ \S+ \s+ \S+ \s+ (\/\S+) \s* $/x;
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print "$1\n";
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}
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close MAP;
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}
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# Get all store paths that appear in the environment of this process.
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eval {
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my $env = Nix::Utils::readFile "$process/environ";
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my @matches = $env =~ /\Q$Nix::Config::storeDir\E\/[0-9a-z]+[0-9a-zA-Z\+\-\._\?=]*/g;
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print "$_\n" foreach @matches;
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}
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}
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closedir DIR;
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}
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sub lsof {
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return unless open LSOF, "lsof -n -w -F n 2> /dev/null |";
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while (<LSOF>) {
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next unless /^n (\/ .*)$/x;
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print $1, "\n";
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}
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close LSOF;
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}
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readProc;
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lsof;
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sub printFile {
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my ($fn) = @_;
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if (-e $fn) {
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print Nix::Utils::readFile($fn), "\n";
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}
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}
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# This is rather NixOS-specific, so it probably shouldn't be here.
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printFile "/proc/sys/kernel/modprobe";
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printFile "/proc/sys/kernel/fbsplash";
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printFile "/proc/sys/kernel/poweroff_cmd";
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@ -9,7 +9,6 @@ bin-scripts += $(nix_bin_scripts)
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nix_noinst_scripts := \
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$(d)/build-remote.pl \
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$(d)/find-runtime-roots.pl \
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$(d)/resolve-system-dependencies.pl \
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$(d)/nix-http-export.cgi \
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$(d)/nix-profile.sh \
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@ -20,7 +19,6 @@ noinst-scripts += $(nix_noinst_scripts)
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profiledir = $(sysconfdir)/profile.d
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$(eval $(call install-file-as, $(d)/nix-profile.sh, $(profiledir)/nix.sh, 0644))
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$(eval $(call install-program-in, $(d)/find-runtime-roots.pl, $(libexecdir)/nix))
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$(eval $(call install-program-in, $(d)/build-remote.pl, $(libexecdir)/nix))
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$(eval $(call install-program-in, $(d)/resolve-system-dependencies.pl, $(libexecdir)/nix))
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$(eval $(call install-symlink, nix-build, $(bindir)/nix-shell))
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@ -5,13 +5,14 @@
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#include <functional>
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#include <queue>
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#include <algorithm>
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#include <regex>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <climits>
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namespace nix {
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@ -330,18 +331,117 @@ Roots LocalStore::findRoots()
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}
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static void readProcLink(const string & file, StringSet & paths)
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{
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/* 64 is the starting buffer size gnu readlink uses... */
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auto bufsiz = ssize_t{64};
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try_again:
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char buf[bufsiz];
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auto res = readlink(file.c_str(), buf, bufsiz);
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if (res == -1) {
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if (errno == ENOENT || errno == EACCES)
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return;
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throw SysError("reading symlink");
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}
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if (res == bufsiz) {
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if (SSIZE_MAX / 2 < bufsiz)
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throw Error("stupidly long symlink");
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bufsiz *= 2;
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goto try_again;
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}
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if (res > 0 && buf[0] == '/')
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paths.emplace(static_cast<char *>(buf), res);
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return;
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}
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static string quoteRegexChars(const string & raw)
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{
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static auto specialRegex = std::regex(R"([.^$\\*+?()\[\]{}|])");
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return std::regex_replace(raw, specialRegex, R"(\$&)");
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}
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static void readFileRoots(const char * path, StringSet & paths)
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{
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try {
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paths.emplace(readFile(path));
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} catch (SysError & e) {
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if (e.errNo != ENOENT && e.errNo != EACCES)
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throw;
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}
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}
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void LocalStore::findRuntimeRoots(PathSet & roots)
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{
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Path rootFinder = getEnv("NIX_ROOT_FINDER",
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settings.nixLibexecDir + "/nix/find-runtime-roots.pl");
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StringSet paths;
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auto procDir = AutoCloseDir{opendir("/proc")};
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if (procDir) {
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struct dirent * ent;
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auto digitsRegex = std::regex(R"(^\d+$)");
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auto mapRegex = std::regex(R"(^\s*\S+\s+\S+\s+\S+\s+\S+\s+\S+\s+(/\S+)\s*$)");
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auto storePathRegex = std::regex(quoteRegexChars(storeDir) + R"(/[0-9a-z]+[0-9a-zA-Z\+\-\._\?=]*)");
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while (errno = 0, ent = readdir(procDir)) {
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checkInterrupt();
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if (std::regex_match(ent->d_name, digitsRegex)) {
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readProcLink((format("/proc/%1%/exe") % ent->d_name).str(), paths);
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readProcLink((format("/proc/%1%/cwd") % ent->d_name).str(), paths);
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if (rootFinder.empty()) return;
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auto fdStr = (format("/proc/%1%/fd") % ent->d_name).str();
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auto fdDir = AutoCloseDir(opendir(fdStr.c_str()));
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if (!fdDir) {
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if (errno == ENOENT || errno == EACCES)
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continue;
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throw SysError(format("opening %1%") % fdStr);
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}
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struct dirent * fd_ent;
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while (errno = 0, fd_ent = readdir(fdDir)) {
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if (fd_ent->d_name[0] != '.') {
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readProcLink((format("%1%/%2%") % fdStr % fd_ent->d_name).str(), paths);
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}
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}
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if (errno)
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throw SysError(format("iterating /proc/%1%/fd") % ent->d_name);
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fdDir.close();
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debug(format("executing ‘%1%’ to find additional roots") % rootFinder);
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auto mapLines =
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tokenizeString<std::vector<string>>(readFile((format("/proc/%1%/maps") % ent->d_name).str(), true), "\n");
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for (const auto& line : mapLines) {
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auto match = std::smatch{};
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if (std::regex_match(line, match, mapRegex))
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paths.emplace(match[1]);
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}
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string result = runProgram(rootFinder);
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try {
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auto envString = readFile((format("/proc/%1%/environ") % ent->d_name).str(), true);
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auto env_end = std::sregex_iterator{};
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for (auto i = std::sregex_iterator{envString.begin(), envString.end(), storePathRegex}; i != env_end; ++i)
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paths.emplace(i->str());
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} catch (SysError & e) {
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if (errno == ENOENT || errno == EACCES)
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continue;
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throw;
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}
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}
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}
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if (errno)
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throw SysError("iterating /proc");
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}
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StringSet paths = tokenizeString<StringSet>(result, "\n");
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try {
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auto lsofRegex = std::regex(R"(^n(/.*)$)");
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auto lsofLines =
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tokenizeString<std::vector<string>>(runProgram("lsof", true, { "-n", "-w", "-F", "n" }), "\n");
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for (const auto & line : lsofLines) {
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auto match = std::smatch{};
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if (std::regex_match(line, match, lsofRegex))
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paths.emplace(match[1]);
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}
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} catch (ExecError & e) {
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/* lsof not installed, lsof failed */
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}
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readFileRoots("/proc/sys/kernel/modprobe", paths);
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readFileRoots("/proc/sys/kernel/fbsplash", paths);
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readFileRoots("/proc/sys/kernel/poweroff_cmd", paths);
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for (auto & i : paths)
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if (isInStore(i)) {
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