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Backport SourcePath from the lazy-trees branch

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This introduces the SourcePath type from lazy-trees as an abstraction
for accessing files from inputs that may not be materialized in the
real filesystem (e.g. Git repositories). Currently, however, it's just
a wrapper around CanonPath, so it shouldn't change any behaviour. (On
lazy-trees, SourcePath is a <InputAccessor, CanonPath> tuple.)
This commit is contained in:
Eelco Dolstra 2023-04-06 13:15:50 +02:00
parent 5256ba6d87
commit 94812cca98
35 changed files with 567 additions and 263 deletions
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56
src/libexpr/eval.hh
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@ -8,6 +8,7 @@
#include "symbol-table.hh"
#include "config.hh"
#include "experimental-features.hh"
#include "input-accessor.hh"
#include <map>
#include <optional>
@ -56,15 +57,11 @@ std::unique_ptr<ValMap> mapStaticEnvBindings(const SymbolTable & st, const Stati
void copyContext(const Value & v, PathSet & context);
/* Cache for calls to addToStore(); maps source paths to the store
paths. */
typedef std::map<Path, StorePath> SrcToStore;
std::string printValue(const EvalState & state, const Value & v);
std::ostream & operator << (std::ostream & os, const ValueType t);
// FIXME: maybe change this to an std::variant<SourcePath, URL>.
typedef std::pair<std::string, std::string> SearchPathElem;
typedef std::list<SearchPathElem> SearchPath;
@ -217,21 +214,24 @@ public:
}
private:
SrcToStore srcToStore;
/* Cache for calls to addToStore(); maps source paths to the store
paths. */
std::map<SourcePath, StorePath> srcToStore;
/* A cache from path names to parse trees. */
#if HAVE_BOEHMGC
typedef std::map<Path, Expr *, std::less<Path>, traceable_allocator<std::pair<const Path, Expr *>>> FileParseCache;
typedef std::map<SourcePath, Expr *, std::less<SourcePath>, traceable_allocator<std::pair<const SourcePath, Expr *>>> FileParseCache;
#else
typedef std::map<Path, Expr *> FileParseCache;
typedef std::map<SourcePath, Expr *> FileParseCache;
#endif
FileParseCache fileParseCache;
/* A cache from path names to values. */
#if HAVE_BOEHMGC
typedef std::map<Path, Value, std::less<Path>, traceable_allocator<std::pair<const Path, Value>>> FileEvalCache;
typedef std::map<SourcePath, Value, std::less<SourcePath>, traceable_allocator<std::pair<const SourcePath, Value>>> FileEvalCache;
#else
typedef std::map<Path, Value> FileEvalCache;
typedef std::map<SourcePath, Value> FileEvalCache;
#endif
FileEvalCache fileEvalCache;
@ -240,7 +240,7 @@ private:
std::map<std::string, std::pair<bool, std::string>> searchPathResolved;
/* Cache used by checkSourcePath(). */
std::unordered_map<Path, Path> resolvedPaths;
std::unordered_map<Path, SourcePath> resolvedPaths;
/* Cache used by prim_match(). */
std::shared_ptr<RegexCache> regexCache;
@ -265,6 +265,12 @@ public:
SearchPath getSearchPath() { return searchPath; }
/**
* Return a `SourcePath` that refers to `path` in the root
* filesystem.
*/
SourcePath rootPath(CanonPath path);
/* Allow access to a path. */
void allowPath(const Path & path);
@ -277,7 +283,7 @@ public:
/* Check whether access to a path is allowed and throw an error if
not. Otherwise return the canonicalised path. */
Path checkSourcePath(const Path & path);
SourcePath checkSourcePath(const SourcePath & path);
void checkURI(const std::string & uri);
@ -291,24 +297,24 @@ public:
Path toRealPath(const Path & path, const PathSet & context);
/* Parse a Nix expression from the specified file. */
Expr * parseExprFromFile(const Path & path);
Expr * parseExprFromFile(const Path & path, std::shared_ptr<StaticEnv> & staticEnv);
Expr * parseExprFromFile(const SourcePath & path);
Expr * parseExprFromFile(const SourcePath & path, std::shared_ptr<StaticEnv> & staticEnv);
/* Parse a Nix expression from the specified string. */
Expr * parseExprFromString(std::string s, const Path & basePath, std::shared_ptr<StaticEnv> & staticEnv);
Expr * parseExprFromString(std::string s, const Path & basePath);
Expr * parseExprFromString(std::string s, const SourcePath & basePath, std::shared_ptr<StaticEnv> & staticEnv);
Expr * parseExprFromString(std::string s, const SourcePath & basePath);
Expr * parseStdin();
/* Evaluate an expression read from the given file to normal
form. Optionally enforce that the top-level expression is
trivial (i.e. doesn't require arbitrary computation). */
void evalFile(const Path & path, Value & v, bool mustBeTrivial = false);
void evalFile(const SourcePath & path, Value & v, bool mustBeTrivial = false);
/* Like `evalFile`, but with an already parsed expression. */
void cacheFile(
const Path & path,
const Path & resolvedPath,
const SourcePath & path,
const SourcePath & resolvedPath,
Expr * e,
Value & v,
bool mustBeTrivial = false);
@ -316,8 +322,8 @@ public:
void resetFileCache();
/* Look up a file in the search path. */
Path findFile(const std::string_view path);
Path findFile(SearchPath & searchPath, const std::string_view path, const PosIdx pos = noPos);
SourcePath findFile(const std::string_view path);
SourcePath findFile(SearchPath & searchPath, const std::string_view path, const PosIdx pos = noPos);
/* If the specified search path element is a URI, download it. */
std::pair<bool, std::string> resolveSearchPathElem(const SearchPathElem & elem);
@ -383,12 +389,12 @@ public:
bool coerceMore = false, bool copyToStore = true,
bool canonicalizePath = true);
StorePath copyPathToStore(PathSet & context, const Path & path);
StorePath copyPathToStore(PathSet & context, const SourcePath & path);
/* Path coercion. Converts strings, paths and derivations to a
path. The result is guaranteed to be a canonicalised, absolute
path. Nothing is copied to the store. */
Path coerceToPath(const PosIdx pos, Value & v, PathSet & context, std::string_view errorCtx);
SourcePath coerceToPath(const PosIdx pos, Value & v, PathSet & context, std::string_view errorCtx);
/* Like coerceToPath, but the result must be a store path. */
StorePath coerceToStorePath(const PosIdx pos, Value & v, PathSet & context, std::string_view errorCtx);
@ -444,7 +450,7 @@ private:
char * text,
size_t length,
Pos::Origin origin,
Path basePath,
const SourcePath & basePath,
std::shared_ptr<StaticEnv> & staticEnv);
public:
@ -556,7 +562,7 @@ std::string_view showType(ValueType type);
std::string showType(const Value & v);
/* If `path' refers to a directory, then append "/default.nix". */
Path resolveExprPath(Path path);
SourcePath resolveExprPath(const SourcePath & path);
struct InvalidPathError : EvalError
{