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Register flake source trees as GC roots
This ensures that flakes don't get garbage-collected, which is important to get nix-channel-like behaviour. For example, running $ nix build hydra: will create a GC root ~/.cache/nix/flake-closures/hydra -> /nix/store/xarfiqcwa4w8r4qpz1a769xxs8c3phgn-flake-closure where the contents/references of the linked file in the store are the flake source trees used by the 'hydra' flake: /nix/store/n6d5f5lkpfjbmkyby0nlg8y1wbkmbc7i-source /nix/store/vbkg4zy1qd29fnhflsv9k2j9jnbqd5m2-source /nix/store/z46xni7d47s5wk694359mq9ay353ar94-source Note that this in itself is not enough to allow offline use; the fetcher for the flakeref (e.g. fetchGit or downloadCached) must not fail if it cannot fetch the latest version of the file, so long as it knows a cached version. Issue #2868.
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3 changed files with 63 additions and 3 deletions
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@ -132,6 +132,8 @@ struct ResolvedFlake
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ResolvedFlake resolveFlake(EvalState &, const FlakeRef &, HandleLockFile);
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void callFlake(EvalState & state, const ResolvedFlake & resFlake, Value & v);
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void updateLockFile(EvalState &, const FlakeRef & flakeRef, bool recreateLockFile);
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void gitCloneFlake(FlakeRef flakeRef, EvalState &, Registries, const Path & destDir);
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@ -10,6 +10,7 @@
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#include "primops/flake.hh"
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#include <regex>
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#include <queue>
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namespace nix {
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@ -162,6 +163,44 @@ struct InstallableAttrPath : InstallableValue
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}
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};
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void makeFlakeClosureGCRoot(Store & store, const FlakeRef & origFlakeRef, const ResolvedFlake & resFlake)
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{
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if (std::get_if<FlakeRef::IsPath>(&origFlakeRef.data)) return;
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/* Get the store paths of all non-local flakes. */
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PathSet closure;
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std::queue<std::reference_wrapper<const ResolvedFlake>> queue;
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queue.push(resFlake);
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while (!queue.empty()) {
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const ResolvedFlake & flake = queue.front();
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queue.pop();
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if (!std::get_if<FlakeRef::IsPath>(&flake.flake.resolvedRef.data))
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closure.insert(flake.flake.storePath);
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for (const auto & dep : flake.flakeDeps)
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queue.push(dep.second);
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}
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if (closure.empty()) return;
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/* Write the closure to a file in the store. */
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auto closurePath = store.addTextToStore("flake-closure", concatStringsSep(" ", closure), closure);
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Path cacheDir = getCacheDir() + "/nix/flake-closures";
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createDirs(cacheDir);
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auto s = origFlakeRef.to_string();
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assert(s[0] != '.');
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s = replaceStrings(s, "%", "%25");
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s = replaceStrings(s, "/", "%2f");
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s = replaceStrings(s, ":", "%3a");
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Path symlink = cacheDir + "/" + s;
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debug("writing GC root '%s' for flake closure of '%s'", symlink, origFlakeRef);
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replaceSymlink(closurePath, symlink);
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store.addIndirectRoot(symlink);
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}
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struct InstallableFlake : InstallableValue
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{
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FlakeRef flakeRef;
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@ -182,7 +221,11 @@ struct InstallableFlake : InstallableValue
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{
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auto vFlake = state.allocValue();
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makeFlakeValue(state, flakeRef, cmd.getLockFileMode(), *vFlake);
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auto resFlake = resolveFlake(state, flakeRef, cmd.getLockFileMode());
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callFlake(state, resFlake, *vFlake);
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makeFlakeClosureGCRoot(*state.store, flakeRef, resFlake);
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auto vProvides = (*vFlake->attrs->get(state.symbols.create("provides")))->value;
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@ -5,7 +5,10 @@ if [[ -z $(type -p git) ]]; then
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exit 99
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fi
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export _NIX_FORCE_HTTP=1
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clearStore
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rm -rf $TEST_HOME/.cache
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registry=$TEST_ROOT/registry.json
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@ -14,7 +17,7 @@ flake2Dir=$TEST_ROOT/flake2
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flake3Dir=$TEST_ROOT/flake3
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for repo in $flake1Dir $flake2Dir $flake3Dir; do
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rm -rf $repo
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rm -rf $repo $repo.tmp
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mkdir $repo
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git -C $repo init
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git -C $repo config user.email "foobar@example.com"
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@ -142,7 +145,7 @@ nix build -o $TEST_ROOT/result --flake-registry $registry flake2:bar
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# Or without a registry.
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# FIXME: shouldn't need '--flake-registry /no-registry'?
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nix build -o $TEST_ROOT/result --flake-registry /no-registry file://$flake2Dir:bar
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nix build -o $TEST_ROOT/result --flake-registry /no-registry file://$flake2Dir:bar --tarball-ttl 0
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# Test whether indirect dependencies work.
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nix build -o $TEST_ROOT/result --flake-registry $registry $flake3Dir:xyzzy
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@ -184,3 +187,15 @@ nix build -o $TEST_ROOT/result --flake-registry $registry $flake3Dir:sth 2>&1 |
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nix flake list --flake-registry file://$registry | grep -q flake3
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mv $registry $registry.tmp
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nix flake list --flake-registry file://$registry --tarball-ttl 0 | grep -q flake3
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mv $registry.tmp $registry
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# Test whether flakes are registered as GC roots for offline use.
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rm -rf $TEST_HOME/.cache
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nix build -o $TEST_ROOT/result --flake-registry file://$registry file://$flake2Dir:bar
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mv $flake1Dir $flake1Dir.tmp
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mv $flake2Dir $flake2Dir.tmp
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nix-store --gc
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nix build -o $TEST_ROOT/result --flake-registry file://$registry file://$flake2Dir:bar
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nix build -o $TEST_ROOT/result --flake-registry file://$registry file://$flake2Dir:bar --tarball-ttl 0
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mv $flake1Dir.tmp $flake1Dir
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mv $flake2Dir.tmp $flake2Dir
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