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Fix handling of relative paths

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In particular, 'path:..' got turned into 'path:.' because isRelative()
returned a CanonPath, which cannot represent '..'.

Reported by @erikarvstedt.
This commit is contained in:
Eelco Dolstra 2022-10-10 18:56:19 +02:00
parent 7317196807
commit 511590976c
5 changed files with 7 additions and 6 deletions
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2
src/libexpr/flake/flake.cc
View file

@ -434,7 +434,7 @@ LockedFlake lockFlake(
if (auto relativePath = input.ref->input.isRelative()) {
SourcePath inputSourcePath {
overridenSourcePath.accessor,
*overridenSourcePath.path.parent() + *relativePath
CanonPath(*relativePath, *overridenSourcePath.path.parent())
};
return readFlake(state, *input.ref, *input.ref, *input.ref, inputSourcePath, inputPath);
} else

2
src/libfetchers/fetchers.cc
View file

@ -95,7 +95,7 @@ bool Input::isLocked() const
return scheme && scheme->isLocked(*this);
}
std::optional<CanonPath> Input::isRelative() const
std::optional<std::string> Input::isRelative() const
{
assert(scheme);
return scheme->isRelative(*this);

4
src/libfetchers/fetchers.hh
View file

@ -53,7 +53,7 @@ public:
/* Only for relative path flakes, i.e. 'path:./foo', returns the
relative path, i.e. './foo'. */
std::optional<CanonPath> isRelative() const;
std::optional<std::string> isRelative() const;
bool operator ==(const Input & other) const;
@ -138,7 +138,7 @@ struct InputScheme
virtual bool isLocked(const Input & input) const
{ return false; }
virtual std::optional<CanonPath> isRelative(const Input & input) const
virtual std::optional<std::string> isRelative(const Input & input) const
{ return std::nullopt; }
virtual std::optional<std::string> getFingerprint(ref<Store> store, const Input & input) const;

4
src/libfetchers/path.cc
View file

@ -78,13 +78,13 @@ struct PathInputScheme : InputScheme
};
}
std::optional<CanonPath> isRelative(const Input & input) const override
std::optional<std::string> isRelative(const Input & input) const override
{
auto path = getStrAttr(input.attrs, "path");
if (hasPrefix(path, "/"))
return std::nullopt;
else
return CanonPath(path);
return path;
}
bool isLocked(const Input & input) const override

1
src/libutil/canon-path.cc
View file

@ -61,6 +61,7 @@ CanonPath CanonPath::operator + (const CanonPath & x) const
void CanonPath::push(std::string_view c)
{
assert(c.find('/') == c.npos);
assert(c != "." && c != "..");
if (!isRoot()) path += '/';
path += c;
}