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refactor(nix/why-depends): use scanForReferencesDeep for --precise mode

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Replaces manual tree-walking and reference scanning with the new
scanForReferencesDeep function.
This commit is contained in:
Bernardo Meurer Costa 2025-10-25 22:55:14 +00:00
parent 5e220271e2
commit 6129aee988
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1 changed files with 36 additions and 43 deletions
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79
src/nix/why-depends.cc
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@ -1,5 +1,6 @@
#include "nix/cmd/command.hh" #include "nix/cmd/command.hh"
#include "nix/store/store-api.hh" #include "nix/store/store-api.hh"
#include "nix/store/path-references.hh"
#include "nix/util/source-accessor.hh" #include "nix/util/source-accessor.hh"
#include "nix/main/shared.hh" #include "nix/main/shared.hh"
@ -191,7 +192,7 @@ struct CmdWhyDepends : SourceExprCommand, MixOperateOnOptions
/* Sort the references by distance to `dependency` to /* Sort the references by distance to `dependency` to
ensure that the shortest path is printed first. */ ensure that the shortest path is printed first. */
std::multimap<size_t, Node *> refs; std::multimap<size_t, Node *> refs;
StringSet hashes; StorePathSet refPaths;
for (auto & ref : node.refs) { for (auto & ref : node.refs) {
if (ref == node.path && packagePath != dependencyPath) if (ref == node.path && packagePath != dependencyPath)
@ -200,7 +201,7 @@ struct CmdWhyDepends : SourceExprCommand, MixOperateOnOptions
if (node2.dist == inf) if (node2.dist == inf)
continue; continue;
refs.emplace(node2.dist, &node2); refs.emplace(node2.dist, &node2);
hashes.insert(std::string(node2.path.hashPart())); refPaths.insert(node2.path);
} }
/* For each reference, find the files and symlinks that /* For each reference, find the files and symlinks that
@ -209,58 +210,50 @@ struct CmdWhyDepends : SourceExprCommand, MixOperateOnOptions
auto accessor = store->requireStoreObjectAccessor(node.path); auto accessor = store->requireStoreObjectAccessor(node.path);
auto visitPath = [&](this auto && recur, const CanonPath & p) -> void { auto getColour = [&](const std::string & hash) {
auto st = accessor->maybeLstat(p); return hash == dependencyPathHash ? ANSI_GREEN : ANSI_BLUE;
assert(st); };
auto p2 = p.isRoot() ? p.abs() : p.rel(); if (precise) {
// Use scanForReferencesDeep to find files containing references
scanForReferencesDeep(*accessor, CanonPath::root, refPaths, [&](FileRefScanResult result) {
auto p2 = result.filePath.isRoot() ? result.filePath.abs() : result.filePath.rel();
auto st = accessor->lstat(result.filePath);
auto getColour = [&](const std::string & hash) { if (st.type == SourceAccessor::Type::tRegular) {
return hash == dependencyPathHash ? ANSI_GREEN : ANSI_BLUE; auto contents = accessor->readFile(result.filePath);
};
if (st->type == SourceAccessor::Type::tDirectory) { // For each reference found in this file, extract context
auto names = accessor->readDirectory(p); for (auto & foundRef : result.foundRefs) {
for (auto & [name, type] : names) std::string hash(foundRef.hashPart());
recur(p / name); auto pos = contents.find(hash);
} if (pos != std::string::npos) {
size_t margin = 32;
else if (st->type == SourceAccessor::Type::tRegular) { auto pos2 = pos >= margin ? pos - margin : 0;
auto contents = accessor->readFile(p); hits[hash].emplace_back(fmt(
"%s: …%s…",
for (auto & hash : hashes) {
auto pos = contents.find(hash);
if (pos != std::string::npos) {
size_t margin = 32;
auto pos2 = pos >= margin ? pos - margin : 0;
hits[hash].emplace_back(
fmt("%s: …%s…",
p2, p2,
hilite( hilite(
filterPrintable(std::string(contents, pos2, pos - pos2 + hash.size() + margin)), filterPrintable(std::string(contents, pos2, pos - pos2 + hash.size() + margin)),
pos - pos2, pos - pos2,
StorePath::HashLen, StorePath::HashLen,
getColour(hash)))); getColour(hash))));
}
}
} else if (st.type == SourceAccessor::Type::tSymlink) {
auto target = accessor->readLink(result.filePath);
// For each reference found in this symlink, show it
for (auto & foundRef : result.foundRefs) {
std::string hash(foundRef.hashPart());
auto pos = target.find(hash);
if (pos != std::string::npos)
hits[hash].emplace_back(
fmt("%s -> %s", p2, hilite(target, pos, StorePath::HashLen, getColour(hash))));
} }
} }
} });
}
else if (st->type == SourceAccessor::Type::tSymlink) {
auto target = accessor->readLink(p);
for (auto & hash : hashes) {
auto pos = target.find(hash);
if (pos != std::string::npos)
hits[hash].emplace_back(
fmt("%s -> %s", p2, hilite(target, pos, StorePath::HashLen, getColour(hash))));
}
}
};
// FIXME: should use scanForReferences().
if (precise)
visitPath(CanonPath::root);
for (auto & ref : refs) { for (auto & ref : refs) {
std::string hash(ref.second->path.hashPart()); std::string hash(ref.second->path.hashPart());