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Restore builtins.pathExists behavior on broken symlinks

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Commit 83c067c0fa changed `builtins.pathExists`
to resolve symlinks before checking for existence. Consequently, if the path
refers to a symlink itself, existence of the target of the symlink (instead of
the symlink itself) was checked. Restore the previous behavior by skipping
symlink resolution in the last component.
This commit is contained in:
Alois Wohlschlager 2024-02-10 20:56:54 +01:00
parent 28a988bdde
commit 89e21ab4bd
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GPG key ID: E0F59EA5E5216914
5 changed files with 46 additions and 19 deletions
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22
src/libutil/source-path.cc
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@ -62,7 +62,7 @@ bool SourcePath::operator<(const SourcePath & x) const
return std::tie(*accessor, path) < std::tie(*x.accessor, x.path);
}
SourcePath SourcePath::resolveSymlinks() const
SourcePath SourcePath::resolveSymlinks(SymlinkResolution mode) const
{
auto res = SourcePath(accessor);
@ -72,6 +72,8 @@ SourcePath SourcePath::resolveSymlinks() const
for (auto & c : path)
todo.push_back(std::string(c));
bool resolve_last = mode == SymlinkResolution::Full;
while (!todo.empty()) {
auto c = *todo.begin();
todo.pop_front();
@ -81,14 +83,16 @@ SourcePath SourcePath::resolveSymlinks() const
res.path.pop();
else {
res.path.push(c);
if (auto st = res.maybeLstat(); st && st->type == InputAccessor::tSymlink) {
if (!linksAllowed--)
throw Error("infinite symlink recursion in path '%s'", path);
auto target = res.readLink();
res.path.pop();
if (hasPrefix(target, "/"))
res.path = CanonPath::root;
todo.splice(todo.begin(), tokenizeString<std::list<std::string>>(target, "/"));
if (resolve_last || !todo.empty()) {
if (auto st = res.maybeLstat(); st && st->type == InputAccessor::tSymlink) {
if (!linksAllowed--)
throw Error("infinite symlink recursion in path '%s'", path);
auto target = res.readLink();
res.path.pop();
if (hasPrefix(target, "/"))
res.path = CanonPath::root;
todo.splice(todo.begin(), tokenizeString<std::list<std::string>>(target, "/"));
}
}
}
}