Merge pull request #6302 from edolstra/fetch-closure
Add builtins.fetchClosure
This commit is contained in:
commit
d9cfd853e5
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@ -1,3 +1,13 @@
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# Release X.Y (202?-??-??)
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* Various nix commands can now read expressions from stdin with `--file -`.
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* `nix store make-content-addressable` has been renamed to `nix store
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make-content-addressed`.
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* New builtin function `builtins.fetchClosure` that copies a closure
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from a binary cache at evaluation time and rewrites it to
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content-addressed form (if it isn't already). Like
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`builtins.storePath`, this allows importing pre-built store paths;
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the difference is that it doesn't require the user to configure
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binary caches and trusted public keys.
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152
src/libexpr/primops/fetchClosure.cc
Normal file
152
src/libexpr/primops/fetchClosure.cc
Normal file
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@ -0,0 +1,152 @@
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#include "primops.hh"
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#include "store-api.hh"
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#include "make-content-addressed.hh"
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#include "url.hh"
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namespace nix {
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static void prim_fetchClosure(EvalState & state, const Pos & pos, Value * * args, Value & v)
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{
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settings.requireExperimentalFeature(Xp::FetchClosure);
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state.forceAttrs(*args[0], pos);
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std::optional<std::string> fromStoreUrl;
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std::optional<StorePath> fromPath;
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bool toCA = false;
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std::optional<StorePath> toPath;
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for (auto & attr : *args[0]->attrs) {
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if (attr.name == "fromPath") {
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PathSet context;
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fromPath = state.coerceToStorePath(*attr.pos, *attr.value, context);
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}
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else if (attr.name == "toPath") {
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state.forceValue(*attr.value, *attr.pos);
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toCA = true;
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if (attr.value->type() != nString || attr.value->string.s != std::string("")) {
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PathSet context;
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toPath = state.coerceToStorePath(*attr.pos, *attr.value, context);
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}
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}
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else if (attr.name == "fromStore")
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fromStoreUrl = state.forceStringNoCtx(*attr.value, *attr.pos);
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else
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throw Error({
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.msg = hintfmt("attribute '%s' isn't supported in call to 'fetchClosure'", attr.name),
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.errPos = pos
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});
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}
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if (!fromPath)
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throw Error({
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.msg = hintfmt("attribute '%s' is missing in call to 'fetchClosure'", "fromPath"),
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.errPos = pos
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});
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if (!fromStoreUrl)
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throw Error({
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.msg = hintfmt("attribute '%s' is missing in call to 'fetchClosure'", "fromStore"),
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.errPos = pos
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});
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auto parsedURL = parseURL(*fromStoreUrl);
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if (parsedURL.scheme != "http" &&
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parsedURL.scheme != "https" &&
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!(getEnv("_NIX_IN_TEST").has_value() && parsedURL.scheme == "file"))
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throw Error({
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.msg = hintfmt("'fetchClosure' only supports http:// and https:// stores"),
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.errPos = pos
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});
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auto fromStore = openStore(parsedURL.to_string());
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if (toCA) {
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if (!toPath || !state.store->isValidPath(*toPath)) {
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auto remappings = makeContentAddressed(*fromStore, *state.store, { *fromPath });
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auto i = remappings.find(*fromPath);
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assert(i != remappings.end());
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if (toPath && *toPath != i->second)
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throw Error({
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.msg = hintfmt("rewriting '%s' to content-addressed form yielded '%s', while '%s' was expected",
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state.store->printStorePath(*fromPath),
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state.store->printStorePath(i->second),
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state.store->printStorePath(*toPath)),
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.errPos = pos
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});
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if (!toPath)
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throw Error({
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.msg = hintfmt(
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"rewriting '%s' to content-addressed form yielded '%s'; "
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"please set this in the 'toPath' attribute passed to 'fetchClosure'",
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state.store->printStorePath(*fromPath),
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state.store->printStorePath(i->second)),
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.errPos = pos
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});
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}
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} else {
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copyClosure(*fromStore, *state.store, RealisedPath::Set { *fromPath });
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toPath = fromPath;
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}
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/* In pure mode, require a CA path. */
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if (evalSettings.pureEval) {
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auto info = state.store->queryPathInfo(*toPath);
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if (!info->isContentAddressed(*state.store))
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throw Error({
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.msg = hintfmt("in pure mode, 'fetchClosure' requires a content-addressed path, which '%s' isn't",
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state.store->printStorePath(*toPath)),
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.errPos = pos
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});
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}
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auto toPathS = state.store->printStorePath(*toPath);
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v.mkString(toPathS, {toPathS});
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}
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static RegisterPrimOp primop_fetchClosure({
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.name = "__fetchClosure",
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.args = {"args"},
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.doc = R"(
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Fetch a Nix store closure from a binary cache, rewriting it into
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content-addressed form. For example,
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```nix
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builtins.fetchClosure {
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fromStore = "https://cache.nixos.org";
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fromPath = /nix/store/r2jd6ygnmirm2g803mksqqjm4y39yi6i-git-2.33.1;
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toPath = /nix/store/ldbhlwhh39wha58rm61bkiiwm6j7211j-git-2.33.1;
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}
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```
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fetches `/nix/store/r2jd...` from the specified binary cache,
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and rewrites it into the content-addressed store path
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`/nix/store/ldbh...`.
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If `fromPath` is already content-addressed, or if you are
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allowing impure evaluation (`--impure`), then `toPath` may be
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omitted.
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To find out the correct value for `toPath` given a `fromPath`,
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you can use `nix store make-content-addressed`:
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```console
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# nix store make-content-addressed --from https://cache.nixos.org /nix/store/r2jd6ygnmirm2g803mksqqjm4y39yi6i-git-2.33.1
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rewrote '/nix/store/r2jd6ygnmirm2g803mksqqjm4y39yi6i-git-2.33.1' to '/nix/store/ldbhlwhh39wha58rm61bkiiwm6j7211j-git-2.33.1'
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```
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This function is similar to `builtins.storePath` in that it
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allows you to use a previously built store path in a Nix
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expression. However, it is more reproducible because it requires
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specifying a binary cache from which the path can be fetched.
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Also, requiring a content-addressed final store path avoids the
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need for users to configure binary cache public keys.
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)",
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.fun = prim_fetchClosure,
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});
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}
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@ -145,7 +145,7 @@ static void fetchTree(
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if (!params.allowNameArgument)
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if (auto nameIter = attrs.find("name"); nameIter != attrs.end())
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throw Error({
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.msg = hintfmt("attribute 'name' isn’t supported in call to 'fetchTree'"),
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.msg = hintfmt("attribute 'name' isn't supported in call to 'fetchTree'"),
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.errPos = pos
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});
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@ -329,7 +329,7 @@ static RegisterPrimOp primop_fetchTarball({
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.fun = prim_fetchTarball,
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});
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static void prim_fetchGit(EvalState &state, const Pos &pos, Value **args, Value &v)
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static void prim_fetchGit(EvalState & state, const Pos & pos, Value * * args, Value & v)
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{
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fetchTree(state, pos, args, v, "git", FetchTreeParams { .emptyRevFallback = true, .allowNameArgument = true });
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}
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80
src/libstore/make-content-addressed.cc
Normal file
80
src/libstore/make-content-addressed.cc
Normal file
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@ -0,0 +1,80 @@
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#include "make-content-addressed.hh"
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#include "references.hh"
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namespace nix {
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std::map<StorePath, StorePath> makeContentAddressed(
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Store & srcStore,
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Store & dstStore,
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const StorePathSet & storePaths)
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{
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StorePathSet closure;
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srcStore.computeFSClosure(storePaths, closure);
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auto paths = srcStore.topoSortPaths(closure);
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std::reverse(paths.begin(), paths.end());
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std::map<StorePath, StorePath> remappings;
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for (auto & path : paths) {
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auto pathS = srcStore.printStorePath(path);
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auto oldInfo = srcStore.queryPathInfo(path);
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std::string oldHashPart(path.hashPart());
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StringSink sink;
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srcStore.narFromPath(path, sink);
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StringMap rewrites;
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StorePathSet references;
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bool hasSelfReference = false;
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for (auto & ref : oldInfo->references) {
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if (ref == path)
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hasSelfReference = true;
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else {
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auto i = remappings.find(ref);
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auto replacement = i != remappings.end() ? i->second : ref;
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// FIXME: warn about unremapped paths?
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if (replacement != ref)
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rewrites.insert_or_assign(srcStore.printStorePath(ref), srcStore.printStorePath(replacement));
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references.insert(std::move(replacement));
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}
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}
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sink.s = rewriteStrings(sink.s, rewrites);
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HashModuloSink hashModuloSink(htSHA256, oldHashPart);
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hashModuloSink(sink.s);
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auto narModuloHash = hashModuloSink.finish().first;
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auto dstPath = dstStore.makeFixedOutputPath(
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FileIngestionMethod::Recursive, narModuloHash, path.name(), references, hasSelfReference);
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printInfo("rewriting '%s' to '%s'", pathS, srcStore.printStorePath(dstPath));
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StringSink sink2;
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RewritingSink rsink2(oldHashPart, std::string(dstPath.hashPart()), sink2);
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rsink2(sink.s);
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rsink2.flush();
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ValidPathInfo info { dstPath, hashString(htSHA256, sink2.s) };
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info.references = std::move(references);
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if (hasSelfReference) info.references.insert(info.path);
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info.narSize = sink.s.size();
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info.ca = FixedOutputHash {
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.method = FileIngestionMethod::Recursive,
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.hash = narModuloHash,
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};
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StringSource source(sink2.s);
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dstStore.addToStore(info, source);
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remappings.insert_or_assign(std::move(path), std::move(info.path));
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}
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return remappings;
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}
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}
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12
src/libstore/make-content-addressed.hh
Normal file
12
src/libstore/make-content-addressed.hh
Normal file
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#pragma once
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#include "store-api.hh"
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namespace nix {
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std::map<StorePath, StorePath> makeContentAddressed(
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Store & srcStore,
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Store & dstStore,
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const StorePathSet & storePaths);
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}
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@ -11,6 +11,7 @@ std::map<ExperimentalFeature, std::string> stringifiedXpFeatures = {
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{ Xp::NixCommand, "nix-command" },
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{ Xp::RecursiveNix, "recursive-nix" },
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{ Xp::NoUrlLiterals, "no-url-literals" },
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{ Xp::FetchClosure, "fetch-closure" },
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};
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const std::optional<ExperimentalFeature> parseExperimentalFeature(const std::string_view & name)
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@ -19,7 +19,8 @@ enum struct ExperimentalFeature
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Flakes,
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NixCommand,
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RecursiveNix,
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NoUrlLiterals
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NoUrlLiterals,
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FetchClosure,
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};
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/**
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@ -117,7 +117,7 @@ struct NixArgs : virtual MultiCommand, virtual MixCommonArgs
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{"hash-path", {"hash", "path"}},
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{"ls-nar", {"nar", "ls"}},
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{"ls-store", {"store", "ls"}},
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{"make-content-addressable", {"store", "make-content-addressable"}},
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{"make-content-addressable", {"store", "make-content-addressed"}},
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{"optimise-store", {"store", "optimise"}},
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{"ping-store", {"store", "ping"}},
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{"sign-paths", {"store", "sign"}},
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|
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@ -1,102 +0,0 @@
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#include "command.hh"
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#include "store-api.hh"
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#include "references.hh"
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#include "common-args.hh"
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#include "json.hh"
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using namespace nix;
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struct CmdMakeContentAddressable : StorePathsCommand, MixJSON
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{
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CmdMakeContentAddressable()
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{
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realiseMode = Realise::Outputs;
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}
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std::string description() override
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{
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return "rewrite a path or closure to content-addressed form";
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}
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std::string doc() override
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{
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return
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#include "make-content-addressable.md"
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;
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}
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void run(ref<Store> store, StorePaths && storePaths) override
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{
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auto paths = store->topoSortPaths(StorePathSet(storePaths.begin(), storePaths.end()));
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std::reverse(paths.begin(), paths.end());
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std::map<StorePath, StorePath> remappings;
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auto jsonRoot = json ? std::make_unique<JSONObject>(std::cout) : nullptr;
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auto jsonRewrites = json ? std::make_unique<JSONObject>(jsonRoot->object("rewrites")) : nullptr;
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for (auto & path : paths) {
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auto pathS = store->printStorePath(path);
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auto oldInfo = store->queryPathInfo(path);
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std::string oldHashPart(path.hashPart());
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StringSink sink;
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store->narFromPath(path, sink);
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StringMap rewrites;
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StorePathSet references;
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bool hasSelfReference = false;
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for (auto & ref : oldInfo->references) {
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if (ref == path)
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hasSelfReference = true;
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else {
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auto i = remappings.find(ref);
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auto replacement = i != remappings.end() ? i->second : ref;
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// FIXME: warn about unremapped paths?
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if (replacement != ref)
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rewrites.insert_or_assign(store->printStorePath(ref), store->printStorePath(replacement));
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references.insert(std::move(replacement));
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}
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}
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sink.s = rewriteStrings(sink.s, rewrites);
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HashModuloSink hashModuloSink(htSHA256, oldHashPart);
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hashModuloSink(sink.s);
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auto narHash = hashModuloSink.finish().first;
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ValidPathInfo info {
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store->makeFixedOutputPath(FileIngestionMethod::Recursive, narHash, path.name(), references, hasSelfReference),
|
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narHash,
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};
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info.references = std::move(references);
|
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if (hasSelfReference) info.references.insert(info.path);
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||||
info.narSize = sink.s.size();
|
||||
info.ca = FixedOutputHash {
|
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.method = FileIngestionMethod::Recursive,
|
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.hash = info.narHash,
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};
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|
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if (!json)
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notice("rewrote '%s' to '%s'", pathS, store->printStorePath(info.path));
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|
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auto source = sinkToSource([&](Sink & nextSink) {
|
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RewritingSink rsink2(oldHashPart, std::string(info.path.hashPart()), nextSink);
|
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rsink2(sink.s);
|
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rsink2.flush();
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});
|
||||
|
||||
store->addToStore(info, *source);
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||||
|
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if (json)
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jsonRewrites->attr(store->printStorePath(path), store->printStorePath(info.path));
|
||||
|
||||
remappings.insert_or_assign(std::move(path), std::move(info.path));
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||||
}
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||||
}
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};
|
||||
|
||||
static auto rCmdMakeContentAddressable = registerCommand2<CmdMakeContentAddressable>({"store", "make-content-addressable"});
|
55
src/nix/make-content-addressed.cc
Normal file
55
src/nix/make-content-addressed.cc
Normal file
|
@ -0,0 +1,55 @@
|
|||
#include "command.hh"
|
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#include "store-api.hh"
|
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#include "make-content-addressed.hh"
|
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#include "common-args.hh"
|
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#include "json.hh"
|
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|
||||
using namespace nix;
|
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|
||||
struct CmdMakeContentAddressed : virtual CopyCommand, virtual StorePathsCommand, MixJSON
|
||||
{
|
||||
CmdMakeContentAddressed()
|
||||
{
|
||||
realiseMode = Realise::Outputs;
|
||||
}
|
||||
|
||||
std::string description() override
|
||||
{
|
||||
return "rewrite a path or closure to content-addressed form";
|
||||
}
|
||||
|
||||
std::string doc() override
|
||||
{
|
||||
return
|
||||
#include "make-content-addressed.md"
|
||||
;
|
||||
}
|
||||
|
||||
void run(ref<Store> srcStore, StorePaths && storePaths) override
|
||||
{
|
||||
auto dstStore = dstUri.empty() ? openStore() : openStore(dstUri);
|
||||
|
||||
auto remappings = makeContentAddressed(*srcStore, *dstStore,
|
||||
StorePathSet(storePaths.begin(), storePaths.end()));
|
||||
|
||||
if (json) {
|
||||
JSONObject jsonRoot(std::cout);
|
||||
JSONObject jsonRewrites(jsonRoot.object("rewrites"));
|
||||
for (auto & path : storePaths) {
|
||||
auto i = remappings.find(path);
|
||||
assert(i != remappings.end());
|
||||
jsonRewrites.attr(srcStore->printStorePath(path), srcStore->printStorePath(i->second));
|
||||
}
|
||||
} else {
|
||||
for (auto & path : storePaths) {
|
||||
auto i = remappings.find(path);
|
||||
assert(i != remappings.end());
|
||||
notice("rewrote '%s' to '%s'",
|
||||
srcStore->printStorePath(path),
|
||||
srcStore->printStorePath(i->second));
|
||||
}
|
||||
}
|
||||
}
|
||||
};
|
||||
|
||||
static auto rCmdMakeContentAddressed = registerCommand2<CmdMakeContentAddressed>({"store", "make-content-addressed"});
|
|
@ -5,7 +5,7 @@ R""(
|
|||
* Create a content-addressed representation of the closure of GNU Hello:
|
||||
|
||||
```console
|
||||
# nix store make-content-addressable -r nixpkgs#hello
|
||||
# nix store make-content-addressed nixpkgs#hello
|
||||
…
|
||||
rewrote '/nix/store/v5sv61sszx301i0x6xysaqzla09nksnd-hello-2.10' to '/nix/store/5skmmcb9svys5lj3kbsrjg7vf2irid63-hello-2.10'
|
||||
```
|
||||
|
@ -29,7 +29,7 @@ R""(
|
|||
system closure:
|
||||
|
||||
```console
|
||||
# nix store make-content-addressable -r /run/current-system
|
||||
# nix store make-content-addressed /run/current-system
|
||||
```
|
||||
|
||||
# Description
|
|
@ -1,6 +1,6 @@
|
|||
source common.sh
|
||||
|
||||
needLocalStore "“--no-require-sigs” can’t be used with the daemon"
|
||||
needLocalStore "'--no-require-sigs' can’t be used with the daemon"
|
||||
|
||||
# We can produce drvs directly into the binary cache
|
||||
clearStore
|
||||
|
|
58
tests/fetchClosure.sh
Normal file
58
tests/fetchClosure.sh
Normal file
|
@ -0,0 +1,58 @@
|
|||
source common.sh
|
||||
|
||||
enableFeatures "fetch-closure"
|
||||
needLocalStore "'--no-require-sigs' can’t be used with the daemon"
|
||||
|
||||
clearStore
|
||||
clearCacheCache
|
||||
|
||||
# Initialize binary cache.
|
||||
nonCaPath=$(nix build --json --file ./dependencies.nix | jq -r .[].outputs.out)
|
||||
caPath=$(nix store make-content-addressed --json $nonCaPath | jq -r '.rewrites | map(.) | .[]')
|
||||
nix copy --to file://$cacheDir $nonCaPath
|
||||
|
||||
# Test basic fetchClosure rewriting from non-CA to CA.
|
||||
clearStore
|
||||
|
||||
[ ! -e $nonCaPath ]
|
||||
[ ! -e $caPath ]
|
||||
|
||||
[[ $(nix eval -v --raw --expr "
|
||||
builtins.fetchClosure {
|
||||
fromStore = \"file://$cacheDir\";
|
||||
fromPath = $nonCaPath;
|
||||
toPath = $caPath;
|
||||
}
|
||||
") = $caPath ]]
|
||||
|
||||
[ ! -e $nonCaPath ]
|
||||
[ -e $caPath ]
|
||||
|
||||
# In impure mode, we can use non-CA paths.
|
||||
[[ $(nix eval --raw --no-require-sigs --impure --expr "
|
||||
builtins.fetchClosure {
|
||||
fromStore = \"file://$cacheDir\";
|
||||
fromPath = $nonCaPath;
|
||||
}
|
||||
") = $nonCaPath ]]
|
||||
|
||||
[ -e $nonCaPath ]
|
||||
|
||||
# 'toPath' set to empty string should fail but print the expected path.
|
||||
nix eval -v --json --expr "
|
||||
builtins.fetchClosure {
|
||||
fromStore = \"file://$cacheDir\";
|
||||
fromPath = $nonCaPath;
|
||||
toPath = \"\";
|
||||
}
|
||||
" 2>&1 | grep "error: rewriting.*$nonCaPath.*yielded.*$caPath"
|
||||
|
||||
# If fromPath is CA, then toPath isn't needed.
|
||||
nix copy --to file://$cacheDir $caPath
|
||||
|
||||
[[ $(nix eval -v --raw --expr "
|
||||
builtins.fetchClosure {
|
||||
fromStore = \"file://$cacheDir\";
|
||||
fromPath = $caPath;
|
||||
}
|
||||
") = $caPath ]]
|
|
@ -96,7 +96,8 @@ nix_tests = \
|
|||
describe-stores.sh \
|
||||
nix-profile.sh \
|
||||
suggestions.sh \
|
||||
store-ping.sh
|
||||
store-ping.sh \
|
||||
fetchClosure.sh
|
||||
|
||||
ifeq ($(HAVE_LIBCPUID), 1)
|
||||
nix_tests += compute-levels.sh
|
||||
|
|
Loading…
Reference in a new issue