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https://github.com/NixOS/nix.git
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LocalStore: Allow the physical and logical store directories to differ
This is primarily to subsume the functionality of the copy-from-other-stores substituter. For example, in the NixOS installer, we can now do (assuming we're in the target chroot, and the Nix store of the installation CD is bind-mounted on /tmp/nix): $ nix-build ... --option substituters 'local?state=/tmp/nix/var&real=/tmp/nix/store' However, unlike copy-from-other-stores, this also allows write access to such a store. One application might be fetching substitutes for /nix/store in a situation where the user doesn't have sufficient privileges to create /nix, e.g.: $ NIX_REMOTE="local?state=/home/alice/nix/var&real=/home/alice/nix/store" nix-build ...
This commit is contained in:
Eelco Dolstra
parent
064816ab98
commit
4494000e04
1
.gitignore
vendored
1
.gitignore
vendored
@ -44,7 +44,6 @@ Makefile.config
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/scripts/nix-copy-closure
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/scripts/NixConfig.pm
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/scripts/NixManifest.pm
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/scripts/copy-from-other-stores.pl
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/scripts/download-from-binary-cache.pl
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/scripts/find-runtime-roots.pl
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/scripts/build-remote.pl
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@ -1,103 +0,0 @@
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#! @perl@ -w @perlFlags@
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use utf8;
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use strict;
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use File::Basename;
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use IO::Handle;
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my $binDir = $ENV{"NIX_BIN_DIR"} || "@bindir@";
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STDOUT->autoflush(1);
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binmode STDERR, ":encoding(utf8)";
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my @remoteStoresAll = split ':', ($ENV{"NIX_OTHER_STORES"} or "");
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my @remoteStores;
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foreach my $dir (@remoteStoresAll) {
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push @remoteStores, glob($dir);
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}
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exit if scalar @remoteStores == 0;
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print "\n";
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$ENV{"NIX_REMOTE"} = "";
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sub findStorePath {
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my $storePath = shift;
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foreach my $store (@remoteStores) {
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my $sourcePath = "$store/store/" . basename $storePath;
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next unless -e $sourcePath || -l $sourcePath;
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$ENV{"NIX_DB_DIR"} = "$store/var/nix/db";
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return ($store, $sourcePath) if
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system("$binDir/nix-store --check-validity $storePath") == 0;
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}
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return undef;
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}
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if ($ARGV[0] eq "--query") {
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while (<STDIN>) {
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chomp;
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my ($cmd, @args) = split " ", $_;
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if ($cmd eq "have") {
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foreach my $storePath (@args) {
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print "$storePath\n" if defined findStorePath($storePath);
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}
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print "\n";
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}
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elsif ($cmd eq "info") {
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foreach my $storePath (@args) {
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my ($store, $sourcePath) = findStorePath($storePath);
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next unless defined $store;
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$ENV{"NIX_DB_DIR"} = "$store/var/nix/db";
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my $deriver = `$binDir/nix-store --query --deriver $storePath`;
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die "cannot query deriver of ‘$storePath’" if $? != 0;
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chomp $deriver;
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$deriver = "" if $deriver eq "unknown-deriver";
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my @references = split "\n",
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`$binDir/nix-store --query --references $storePath`;
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die "cannot query references of ‘$storePath’" if $? != 0;
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my $narSize = `$binDir/nix-store --query --size $storePath`;
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die "cannot query size of ‘$storePath’" if $? != 0;
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chomp $narSize;
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print "$storePath\n";
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print "$deriver\n";
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print scalar @references, "\n";
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print "$_\n" foreach @references;
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print "0\n";
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print "$narSize\n";
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}
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print "\n";
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}
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else { die "unknown command ‘$cmd’"; }
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}
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}
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elsif ($ARGV[0] eq "--substitute") {
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die unless scalar @ARGV == 3;
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my $storePath = $ARGV[1];
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my $destPath = $ARGV[2];
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my ($store, $sourcePath) = findStorePath $storePath;
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die unless $store;
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print STDERR "\n*** Copying ‘$storePath’ from ‘$sourcePath’\n\n";
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system("@coreutils@/cp", "-rpd", $sourcePath, $destPath) == 0
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or die "cannot copy ‘$sourcePath’ to ‘$storePath’";
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print "\n"; # no hash to verify
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}
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else { die; }
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@ -1269,6 +1269,9 @@ void DerivationGoal::tryToBuild()
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{
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trace("trying to build");
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if (worker.store.storeDir != worker.store.realStoreDir)
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throw Error("building with a diverted Nix store is not supported");
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/* Check for the possibility that some other goal in this process
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has locked the output since we checked in haveDerivation().
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(It can't happen between here and the lockPaths() call below
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@ -370,7 +370,6 @@ struct LocalStore::GCState
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bool gcKeepDerivations;
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unsigned long long bytesInvalidated;
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bool moveToTrash = true;
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Path trashDir;
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bool shouldDelete;
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GCState(GCResults & results_) : results(results_), bytesInvalidated(0) { }
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};
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@ -407,10 +406,12 @@ void LocalStore::deletePathRecursive(GCState & state, const Path & path)
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invalidatePathChecked(path);
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}
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Path realPath = realStoreDir + "/" + baseNameOf(path);
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struct stat st;
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if (lstat(path.c_str(), &st)) {
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if (lstat(realPath.c_str(), &st)) {
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if (errno == ENOENT) return;
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throw SysError(format("getting status of %1%") % path);
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throw SysError(format("getting status of %1%") % realPath);
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}
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printMsg(lvlInfo, format("deleting ‘%1%’") % path);
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@ -427,20 +428,20 @@ void LocalStore::deletePathRecursive(GCState & state, const Path & path)
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// if the path was not valid, need to determine the actual
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// size.
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try {
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if (chmod(path.c_str(), st.st_mode | S_IWUSR) == -1)
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throw SysError(format("making ‘%1%’ writable") % path);
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Path tmp = state.trashDir + "/" + baseNameOf(path);
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if (rename(path.c_str(), tmp.c_str()))
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throw SysError(format("unable to rename ‘%1%’ to ‘%2%’") % path % tmp);
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if (chmod(realPath.c_str(), st.st_mode | S_IWUSR) == -1)
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throw SysError(format("making ‘%1%’ writable") % realPath);
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Path tmp = trashDir + "/" + baseNameOf(path);
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if (rename(realPath.c_str(), tmp.c_str()))
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throw SysError(format("unable to rename ‘%1%’ to ‘%2%’") % realPath % tmp);
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state.bytesInvalidated += size;
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} catch (SysError & e) {
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if (e.errNo == ENOSPC) {
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printMsg(lvlInfo, format("note: can't create move ‘%1%’: %2%") % path % e.msg());
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deleteGarbage(state, path);
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printMsg(lvlInfo, format("note: can't create move ‘%1%’: %2%") % realPath % e.msg());
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deleteGarbage(state, realPath);
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}
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}
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} else
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deleteGarbage(state, path);
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deleteGarbage(state, realPath);
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if (state.results.bytesFreed + state.bytesInvalidated > state.options.maxFreed) {
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printMsg(lvlInfo, format("deleted or invalidated more than %1% bytes; stopping") % state.options.maxFreed);
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@ -508,7 +509,8 @@ void LocalStore::tryToDelete(GCState & state, const Path & path)
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{
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checkInterrupt();
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if (path == linksDir || path == state.trashDir) return;
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auto realPath = realStoreDir + "/" + baseNameOf(path);
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if (realPath == linksDir || realPath == trashDir) return;
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Activity act(*logger, lvlDebug, format("considering whether to delete ‘%1%’") % path);
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@ -590,7 +592,6 @@ void LocalStore::collectGarbage(const GCOptions & options, GCResults & results)
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{
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GCState state(results);
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state.options = options;
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state.trashDir = storeDir + "/trash";
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state.gcKeepOutputs = settings.gcKeepOutputs;
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state.gcKeepDerivations = settings.gcKeepDerivations;
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@ -639,9 +640,9 @@ void LocalStore::collectGarbage(const GCOptions & options, GCResults & results)
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that is not reachable from `roots' is garbage. */
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if (state.shouldDelete) {
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if (pathExists(state.trashDir)) deleteGarbage(state, state.trashDir);
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if (pathExists(trashDir)) deleteGarbage(state, trashDir);
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try {
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createDirs(state.trashDir);
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createDirs(trashDir);
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} catch (SysError & e) {
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if (e.errNo == ENOSPC) {
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printMsg(lvlInfo, format("note: can't create trash directory: %1%") % e.msg());
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@ -671,8 +672,8 @@ void LocalStore::collectGarbage(const GCOptions & options, GCResults & results)
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try {
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AutoCloseDir dir = opendir(storeDir.c_str());
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if (!dir) throw SysError(format("opening directory ‘%1%’") % storeDir);
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AutoCloseDir dir = opendir(realStoreDir.c_str());
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if (!dir) throw SysError(format("opening directory ‘%1%’") % realStoreDir);
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/* Read the store and immediately delete all paths that
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aren't valid. When using --max-freed etc., deleting
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@ -725,8 +726,8 @@ void LocalStore::collectGarbage(const GCOptions & options, GCResults & results)
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fds.clear();
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/* Delete the trash directory. */
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printMsg(lvlInfo, format("deleting ‘%1%’") % state.trashDir);
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deleteGarbage(state, state.trashDir);
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printMsg(lvlInfo, format("deleting ‘%1%’") % trashDir);
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deleteGarbage(state, trashDir);
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/* Clean up the links directory. */
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if (options.action == GCOptions::gcDeleteDead || options.action == GCOptions::gcDeleteSpecific) {
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@ -38,10 +38,12 @@ namespace nix {
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LocalStore::LocalStore(const Params & params)
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: LocalFSStore(params)
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, realStoreDir(get(params, "real", storeDir))
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, dbDir(get(params, "state", "") != "" ? get(params, "state", "") + "/db" : settings.nixDBPath)
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, linksDir(storeDir + "/.links")
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, linksDir(realStoreDir + "/.links")
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, reservedPath(dbDir + "/reserved")
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, schemaPath(dbDir + "/schema")
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, trashDir(realStoreDir + "/trash")
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, requireSigs(settings.get("signed-binary-caches", std::string("")) != "") // FIXME: rename option
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, publicKeys(getDefaultPublicKeys())
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{
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@ -53,7 +55,7 @@ LocalStore::LocalStore(const Params & params)
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}
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/* Create missing state directories if they don't already exist. */
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createDirs(storeDir);
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createDirs(realStoreDir);
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makeStoreWritable();
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createDirs(linksDir);
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Path profilesDir = stateDir + "/profiles";
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@ -83,21 +85,21 @@ LocalStore::LocalStore(const Params & params)
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% settings.buildUsersGroup);
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else {
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struct stat st;
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if (stat(storeDir.c_str(), &st))
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throw SysError(format("getting attributes of path ‘%1%’") % storeDir);
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if (stat(realStoreDir.c_str(), &st))
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throw SysError(format("getting attributes of path ‘%1%’") % realStoreDir);
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if (st.st_uid != 0 || st.st_gid != gr->gr_gid || (st.st_mode & ~S_IFMT) != perm) {
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if (chown(storeDir.c_str(), 0, gr->gr_gid) == -1)
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throw SysError(format("changing ownership of path ‘%1%’") % storeDir);
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if (chmod(storeDir.c_str(), perm) == -1)
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throw SysError(format("changing permissions on path ‘%1%’") % storeDir);
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if (chown(realStoreDir.c_str(), 0, gr->gr_gid) == -1)
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throw SysError(format("changing ownership of path ‘%1%’") % realStoreDir);
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if (chmod(realStoreDir.c_str(), perm) == -1)
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throw SysError(format("changing permissions on path ‘%1%’") % realStoreDir);
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}
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}
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}
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/* Ensure that the store and its parents are not symlinks. */
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if (getEnv("NIX_IGNORE_SYMLINK_STORE") != "1") {
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Path path = storeDir;
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Path path = realStoreDir;
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struct stat st;
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while (path != "/") {
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if (lstat(path.c_str(), &st))
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@ -343,15 +345,15 @@ void LocalStore::makeStoreWritable()
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if (getuid() != 0) return;
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/* Check if /nix/store is on a read-only mount. */
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struct statvfs stat;
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if (statvfs(storeDir.c_str(), &stat) != 0)
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if (statvfs(realStoreDir.c_str(), &stat) != 0)
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throw SysError("getting info about the Nix store mount point");
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if (stat.f_flag & ST_RDONLY) {
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if (unshare(CLONE_NEWNS) == -1)
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throw SysError("setting up a private mount namespace");
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if (mount(0, storeDir.c_str(), "none", MS_REMOUNT | MS_BIND, 0) == -1)
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throw SysError(format("remounting %1% writable") % storeDir);
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if (mount(0, realStoreDir.c_str(), "none", MS_REMOUNT | MS_BIND, 0) == -1)
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throw SysError(format("remounting %1% writable") % realStoreDir);
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}
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#endif
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}
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@ -917,23 +919,25 @@ void LocalStore::addToStore(const ValidPathInfo & info, const std::string & nar,
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PathLocks outputLock;
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Path realPath = realStoreDir + "/" + baseNameOf(info.path);
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/* Lock the output path. But don't lock if we're being called
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from a build hook (whose parent process already acquired a
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lock on this path). */
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Strings locksHeld = tokenizeString<Strings>(getEnv("NIX_HELD_LOCKS"));
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if (find(locksHeld.begin(), locksHeld.end(), info.path) == locksHeld.end())
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outputLock.lockPaths({info.path});
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outputLock.lockPaths({realPath});
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if (repair || !isValidPath(info.path)) {
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deletePath(info.path);
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deletePath(realPath);
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StringSource source(nar);
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restorePath(info.path, source);
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restorePath(realPath, source);
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canonicalisePathMetaData(info.path, -1);
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canonicalisePathMetaData(realPath, -1);
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optimisePath(info.path); // FIXME: combine with hashPath()
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optimisePath(realPath); // FIXME: combine with hashPath()
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registerValidPath(info);
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}
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@ -957,19 +961,21 @@ Path LocalStore::addToStoreFromDump(const string & dump, const string & name,
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/* The first check above is an optimisation to prevent
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unnecessary lock acquisition. */
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PathLocks outputLock({dstPath});
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Path realPath = realStoreDir + "/" + baseNameOf(dstPath);
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PathLocks outputLock({realPath});
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|
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if (repair || !isValidPath(dstPath)) {
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|
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deletePath(dstPath);
|
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deletePath(realPath);
|
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|
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if (recursive) {
|
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StringSource source(dump);
|
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restorePath(dstPath, source);
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restorePath(realPath, source);
|
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} else
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writeFile(dstPath, dump);
|
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writeFile(realPath, dump);
|
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|
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canonicalisePathMetaData(dstPath, -1);
|
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canonicalisePathMetaData(realPath, -1);
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|
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/* Register the SHA-256 hash of the NAR serialisation of
|
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the path in the database. We may just have computed it
|
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@ -980,9 +986,9 @@ Path LocalStore::addToStoreFromDump(const string & dump, const string & name,
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hash.first = hashAlgo == htSHA256 ? h : hashString(htSHA256, dump);
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hash.second = dump.size();
|
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} else
|
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hash = hashPath(htSHA256, dstPath);
|
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hash = hashPath(htSHA256, realPath);
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|
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optimisePath(dstPath); // FIXME: combine with hashPath()
|
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optimisePath(realPath); // FIXME: combine with hashPath()
|
||||
|
||||
ValidPathInfo info;
|
||||
info.path = dstPath;
|
||||
@ -1026,21 +1032,23 @@ Path LocalStore::addTextToStore(const string & name, const string & s,
|
||||
|
||||
if (repair || !isValidPath(dstPath)) {
|
||||
|
||||
PathLocks outputLock({dstPath});
|
||||
Path realPath = realStoreDir + "/" + baseNameOf(dstPath);
|
||||
|
||||
PathLocks outputLock({realPath});
|
||||
|
||||
if (repair || !isValidPath(dstPath)) {
|
||||
|
||||
deletePath(dstPath);
|
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deletePath(realPath);
|
||||
|
||||
writeFile(dstPath, s);
|
||||
writeFile(realPath, s);
|
||||
|
||||
canonicalisePathMetaData(dstPath, -1);
|
||||
canonicalisePathMetaData(realPath, -1);
|
||||
|
||||
StringSink sink;
|
||||
dumpString(s, sink);
|
||||
auto hash = hashString(htSHA256, *sink.s);
|
||||
|
||||
optimisePath(dstPath);
|
||||
optimisePath(realPath);
|
||||
|
||||
ValidPathInfo info;
|
||||
info.path = dstPath;
|
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@ -1067,7 +1075,7 @@ Path LocalStore::createTempDirInStore()
|
||||
/* There is a slight possibility that `tmpDir' gets deleted by
|
||||
the GC between createTempDir() and addTempRoot(), so repeat
|
||||
until `tmpDir' exists. */
|
||||
tmpDir = createTempDir(storeDir);
|
||||
tmpDir = createTempDir(realStoreDir);
|
||||
addTempRoot(tmpDir);
|
||||
} while (!pathExists(tmpDir));
|
||||
return tmpDir;
|
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@ -1107,7 +1115,7 @@ bool LocalStore::verifyStore(bool checkContents, bool repair)
|
||||
AutoCloseFD fdGCLock = openGCLock(ltWrite);
|
||||
|
||||
PathSet store;
|
||||
for (auto & i : readDirectory(storeDir)) store.insert(i.name);
|
||||
for (auto & i : readDirectory(realStoreDir)) store.insert(i.name);
|
||||
|
||||
/* Check whether all valid paths actually exist. */
|
||||
printMsg(lvlInfo, "checking path existence...");
|
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@ -1271,7 +1279,7 @@ void LocalStore::upgradeStore7()
|
||||
{
|
||||
if (getuid() != 0) return;
|
||||
printMsg(lvlError, "removing immutable bits from the Nix store (this may take a while)...");
|
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makeMutable(storeDir);
|
||||
makeMutable(realStoreDir);
|
||||
}
|
||||
|
||||
#else
|
||||
|
||||
@ -73,10 +73,12 @@ private:
|
||||
|
||||
Sync<State, std::recursive_mutex> _state;
|
||||
|
||||
const Path realStoreDir;
|
||||
const Path dbDir;
|
||||
const Path linksDir;
|
||||
const Path reservedPath;
|
||||
const Path schemaPath;
|
||||
const Path trashDir;
|
||||
|
||||
bool requireSigs;
|
||||
|
||||
|
||||
@ -176,7 +176,7 @@ void LocalStore::optimisePath_(OptimiseStats & stats, const Path & path, InodeHa
|
||||
/* Make the containing directory writable, but only if it's not
|
||||
the store itself (we don't want or need to mess with its
|
||||
permissions). */
|
||||
bool mustToggle = !isStorePath(path);
|
||||
bool mustToggle = dirOf(path) != realStoreDir;
|
||||
if (mustToggle) makeWritable(dirOf(path));
|
||||
|
||||
/* When we're done, make the directory read-only again and reset
|
||||
@ -184,7 +184,7 @@ void LocalStore::optimisePath_(OptimiseStats & stats, const Path & path, InodeHa
|
||||
MakeReadOnly makeReadOnly(mustToggle ? dirOf(path) : "");
|
||||
|
||||
Path tempLink = (format("%1%/.tmp-link-%2%-%3%")
|
||||
% storeDir % getpid() % rand()).str();
|
||||
% realStoreDir % getpid() % rand()).str();
|
||||
|
||||
if (link(linkPath.c_str(), tempLink.c_str()) == -1) {
|
||||
if (errno == EMLINK) {
|
||||
@ -229,7 +229,7 @@ void LocalStore::optimiseStore(OptimiseStats & stats)
|
||||
addTempRoot(i);
|
||||
if (!isValidPath(i)) continue; /* path was GC'ed, probably */
|
||||
Activity act(*logger, lvlChatty, format("hashing files in ‘%1%’") % i);
|
||||
optimisePath_(stats, i, inodeHash);
|
||||
optimisePath_(stats, realStoreDir + "/" + baseNameOf(i), inodeHash);
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
Loading…
Reference in New Issue
Block a user