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It doesn't seem like this even needs to write anything to disk tbh... A MemorySink + MemorySourceAccessor should be plenty enough.
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🤖 Claude Opus 5.5 responding on behalf of yungweng
Done in d419c7b. buildProfile() now fills a MemorySourceAccessor. nix profile dumps from it directly, and builtin:buildenv restores it to $out with a RestoreSink. Old and new builds give identical store paths and NAR hashes for both nix profile and nix-env, collisions included.
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| auto srcFile = (std::filesystem::path{srcDir} / name).string(); | ||
| auto dstFile = (std::filesystem::path{dstDir} / name).string(); | ||
| auto dstFile = dstDir / name.string(); | ||
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| auto srcStOpt = maybeStat(srcFile.c_str()); |
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Btw this whole .string() and .c_str() can also be cleaned up :)
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🤖 Claude Opus 5.5 responding on behalf of yungweng
Done in 35a1f7d. srcFile stays a std::filesystem::path, and the skip list compares name instead of path suffixes (info/dir checks srcDir.filename()). .string() remains only where a std::string is needed: the dot check, the CanonPath component and the MemorySink::createSymlink target. Store paths and NAR hashes are still identical to master, including the skipped files.
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…tory ProfileManifest::build() created a temporary directory for the profile's symlink tree and never removed it, so every `nix profile add`, `remove` and `upgrade` left a `nix-<pid>-<n>` directory in $TMPDIR. buildProfile() now returns the tree as a MemorySourceAccessor. `nix profile` adds it to the store with Store::addToStore(), and builtin:buildenv (nix-env) writes it to its output with a RestoreSink. Fixes NixOS#10404 Assisted-by: Claude Code (Claude Opus 5.5) Assisted-by: Claude Code (Claude Fable 5.2)
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| # Building the new profile must not leak its temporary directory (#10404). | ||
| mkdir "$TEST_ROOT/tmp" | ||
| TMPDIR=$TEST_ROOT/tmp nix profile add "$flake1Dir" -L | ||
| [[ -z $(ls -A "$TEST_ROOT/tmp") ]] |
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This test is now pretty irrelevant that the implementation doesn't create temp directories right?
| static void createLinks(State & state, const std::filesystem::path & srcDir, const CanonPath & dstDir, int priority) | ||
| { | ||
| DirectoryIterator srcFiles; |
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Any chance that we could honor the NAR recursion depth here?
| } else if (auto * link = std::get_if<MemorySourceAccessor::File::Symlink>(&dst->raw)) { | ||
| auto target = canonPath(link->target, true); | ||
| if (!S_ISDIR(lstat(target).st_mode)) | ||
| throw Error("collision between %1% and non-directory %2%", PathFmt(srcFile), PathFmt(target)); |
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This should no longer be using PathFmt though? Since it's a CanonPath
Assisted-by: Codex (GPT-6)
| class BuildProfileTest : public ::testing::Test | ||
| { | ||
| protected: | ||
| AutoDelete tempDir{createTempDir()}; |
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This shoule be in SetUp and TearDown, no?
| makePackage("third", narMaxDepth - 2)}); | ||
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| auto dir = CanonPath(std::vector<std::string>(narMaxDepth - 2, "d")); | ||
| EXPECT_EQ(profile->readDirectory(dir).size(), 3); |
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We have testing::HasDirectory matcher for this
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Motivation
Every
nix profile add,removeandupgradeleaves the temporary profile tree behind in$TMPDIR. With a devbox profile that is about 7,400 files per call, which on a tmpfs/tmpeventually exhausts the inode limit.Fixes #10404
Implementation
buildProfile()builds the symlink tree in memory and returns it as aref<MemorySourceAccessor>, so there is no temporary directory any more.nix profileadds it to the store with theSourcePathoverload ofStore::addToStore().builtin:buildenv(nix-env) writes the tree to its output with aRestoreSink, asInputScheme::clonedoes. Themkdir/unlinkcalls and the Windows#ifdefincreateLinksgo away.createLinksalso works onstd::filesystem::pathnow instead of converting to strings, and the skip list compares file names instead of path suffixes.The output is unchanged. The old and new builds produce the same store path, NAR hash, references and content address for
nix profile(local store and through the daemon) and the same store path and NAR hash fornix-env, including a directory collision (symlink replaced by a real directory), a priority collision, the skipped files and the same-priority conflict error. The only visible difference is the "collision between non-directory ... and directory ..." error: it used to name the path inside the leaked temporary directory and now names the path inside the profile.The functional test runs
nix profile addwith a freshTMPDIRand checks that it is empty afterwards. It fails on master.nix-profile,user-envs,nix-channel,nix-collect-garbage-d,remote-store,binary-cache,tarball,simpleandmiscpass.