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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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52
src/libexpr/parser.y
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@ -31,7 +31,7 @@ namespace nix {
EvalState & state;
SymbolTable & symbols;
Expr * result;
Path basePath;
SourcePath basePath;
PosTable::Origin origin;
std::optional<ErrorInfo> error;
};
@ -509,7 +509,7 @@ string_parts_interpolated
path_start
: PATH {
Path path(absPath({$1.p, $1.l}, data->basePath));
Path path(absPath({$1.p, $1.l}, data->basePath.path.abs()));
/* add back in the trailing '/' to the first segment */
if ($1.p[$1.l-1] == '/' && $1.l > 1)
path += "/";
@ -651,7 +651,7 @@ Expr * EvalState::parse(
char * text,
size_t length,
Pos::Origin origin,
Path basePath,
const SourcePath & basePath,
std::shared_ptr<StaticEnv> & staticEnv)
{
yyscan_t scanner;
@ -675,48 +675,36 @@ Expr * EvalState::parse(
}
Path resolveExprPath(Path path)
SourcePath resolveExprPath(const SourcePath & path)
{
assert(path[0] == '/');
unsigned int followCount = 0, maxFollow = 1024;
/* If `path' is a symlink, follow it. This is so that relative
path references work. */
struct stat st;
while (true) {
// Basic cycle/depth limit to avoid infinite loops.
if (++followCount >= maxFollow)
throw Error("too many symbolic links encountered while traversing the path '%s'", path);
st = lstat(path);
if (!S_ISLNK(st.st_mode)) break;
path = absPath(readLink(path), dirOf(path));
}
auto path2 = path.resolveSymlinks();
/* If `path' refers to a directory, append `/default.nix'. */
if (S_ISDIR(st.st_mode))
path = canonPath(path + "/default.nix");
if (path2.lstat().type == InputAccessor::tDirectory)
return path2 + "default.nix";
return path;
return path2;
}
Expr * EvalState::parseExprFromFile(const Path & path)
Expr * EvalState::parseExprFromFile(const SourcePath & path)
{
return parseExprFromFile(path, staticBaseEnv);
}
Expr * EvalState::parseExprFromFile(const Path & path, std::shared_ptr<StaticEnv> & staticEnv)
Expr * EvalState::parseExprFromFile(const SourcePath & path, std::shared_ptr<StaticEnv> & staticEnv)
{
auto buffer = readFile(path);
// readFile should have left some extra space for terminators
auto buffer = path.readFile();
// readFile hopefully have left some extra space for terminators
buffer.append("\0\0", 2);
return parse(buffer.data(), buffer.size(), path, dirOf(path), staticEnv);
return parse(buffer.data(), buffer.size(), path.path.abs(), path.parent(), staticEnv);
}
Expr * EvalState::parseExprFromString(std::string s_, const Path & basePath, std::shared_ptr<StaticEnv> & staticEnv)
Expr * EvalState::parseExprFromString(std::string s_, const SourcePath & basePath, std::shared_ptr<StaticEnv> & staticEnv)
{
auto s = make_ref<std::string>(std::move(s_));
s->append("\0\0", 2);
@ -724,7 +712,7 @@ Expr * EvalState::parseExprFromString(std::string s_, const Path & basePath, std
}
Expr * EvalState::parseExprFromString(std::string s, const Path & basePath)
Expr * EvalState::parseExprFromString(std::string s, const SourcePath & basePath)
{
return parseExprFromString(std::move(s), basePath, staticBaseEnv);
}
@ -737,7 +725,7 @@ Expr * EvalState::parseStdin()
// drainFD should have left some extra space for terminators
buffer.append("\0\0", 2);
auto s = make_ref<std::string>(std::move(buffer));
return parse(s->data(), s->size(), Pos::Stdin{.source = s}, absPath("."), staticBaseEnv);
return parse(s->data(), s->size(), Pos::Stdin{.source = s}, rootPath(CanonPath::fromCwd()), staticBaseEnv);
}
@ -757,13 +745,13 @@ void EvalState::addToSearchPath(const std::string & s)
}
Path EvalState::findFile(const std::string_view path)
SourcePath EvalState::findFile(const std::string_view path)
{
return findFile(searchPath, path);
}
Path EvalState::findFile(SearchPath & searchPath, const std::string_view path, const PosIdx pos)
SourcePath EvalState::findFile(SearchPath & searchPath, const std::string_view path, const PosIdx pos)
{
for (auto & i : searchPath) {
std::string suffix;
@ -779,11 +767,11 @@ Path EvalState::findFile(SearchPath & searchPath, const std::string_view path, c
auto r = resolveSearchPathElem(i);
if (!r.first) continue;
Path res = r.second + suffix;
if (pathExists(res)) return canonPath(res);
if (pathExists(res)) return CanonPath(canonPath(res));
}
if (hasPrefix(path, "nix/"))
return concatStrings(corepkgsPrefix, path.substr(4));
return CanonPath(concatStrings(corepkgsPrefix, path.substr(4)));
debugThrow(ThrownError({
.msg = hintfmt(evalSettings.pureEval