mirror of
https://github.com/NixOS/nix
synced 2025-06-25 06:31:14 +02:00
94812cca98
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.)
100 lines
2.7 KiB
C++
100 lines
2.7 KiB
C++
#include "input-accessor.hh"
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#include "store-api.hh"
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namespace nix {
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std::ostream & operator << (std::ostream & str, const SourcePath & path)
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{
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str << path.to_string();
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return str;
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}
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std::string_view SourcePath::baseName() const
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{
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return path.baseName().value_or("source");
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}
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SourcePath SourcePath::parent() const
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{
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auto p = path.parent();
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assert(p);
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return std::move(*p);
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}
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InputAccessor::Stat SourcePath::lstat() const
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{
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auto st = nix::lstat(path.abs());
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return InputAccessor::Stat {
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.type =
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S_ISREG(st.st_mode) ? InputAccessor::tRegular :
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S_ISDIR(st.st_mode) ? InputAccessor::tDirectory :
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S_ISLNK(st.st_mode) ? InputAccessor::tSymlink :
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InputAccessor::tMisc,
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.isExecutable = S_ISREG(st.st_mode) && st.st_mode & S_IXUSR
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};
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}
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std::optional<InputAccessor::Stat> SourcePath::maybeLstat() const
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{
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// FIXME: merge these into one operation.
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if (!pathExists())
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return {};
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return lstat();
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}
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InputAccessor::DirEntries SourcePath::readDirectory() const
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{
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InputAccessor::DirEntries res;
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for (auto & entry : nix::readDirectory(path.abs())) {
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std::optional<InputAccessor::Type> type;
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switch (entry.type) {
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case DT_REG: type = InputAccessor::Type::tRegular; break;
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case DT_LNK: type = InputAccessor::Type::tSymlink; break;
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case DT_DIR: type = InputAccessor::Type::tDirectory; break;
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}
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res.emplace(entry.name, type);
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}
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return res;
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}
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StorePath SourcePath::fetchToStore(
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ref<Store> store,
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std::string_view name,
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PathFilter * filter,
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RepairFlag repair) const
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{
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return
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settings.readOnlyMode
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? store->computeStorePathForPath(name, path.abs(), FileIngestionMethod::Recursive, htSHA256, filter ? *filter : defaultPathFilter).first
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: store->addToStore(name, path.abs(), FileIngestionMethod::Recursive, htSHA256, filter ? *filter : defaultPathFilter, repair);
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}
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SourcePath SourcePath::resolveSymlinks() const
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{
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SourcePath res(CanonPath::root);
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int linksAllowed = 1024;
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for (auto & component : path) {
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res.path.push(component);
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while (true) {
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if (auto st = res.maybeLstat()) {
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if (!linksAllowed--)
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throw Error("infinite symlink recursion in path '%s'", path);
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if (st->type != InputAccessor::tSymlink) break;
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auto target = res.readLink();
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if (hasPrefix(target, "/"))
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res = CanonPath(target);
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else {
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res.path.pop();
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res.path.extend(CanonPath(target));
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}
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} else
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break;
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}
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}
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return res;
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}
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}
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