mirror of
https://github.com/NixOS/nix
synced 2024-09-20 11:11:03 -04:00
2040240e23
The typical use is to inherit Config and add Setting<T> members:
class MyClass : private Config
{
Setting<int> foo{this, 123, "foo", "the number of foos to use"};
Setting<std::string> bar{this, "blabla", "bar", "the name of the bar"};
MyClass() : Config(readConfigFile("/etc/my-app.conf"))
{
std::cout << foo << "\n"; // will print 123 unless overriden
}
};
Currently, this is used by Store and its subclasses for store
parameters. You now get a warning if you specify a non-existant store
parameter in a store URI.
131 lines
3.4 KiB
C++
131 lines
3.4 KiB
C++
#include "archive.hh"
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#include "fs-accessor.hh"
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#include "store-api.hh"
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#include "globals.hh"
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#include "compression.hh"
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#include "derivations.hh"
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namespace nix {
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LocalFSStore::LocalFSStore(const Params & params)
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: Store(params)
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{
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}
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struct LocalStoreAccessor : public FSAccessor
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{
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ref<LocalFSStore> store;
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LocalStoreAccessor(ref<LocalFSStore> store) : store(store) { }
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Path toRealPath(const Path & path)
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{
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Path storePath = store->toStorePath(path);
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if (!store->isValidPath(storePath))
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throw InvalidPath(format("path ‘%1%’ is not a valid store path") % storePath);
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return store->getRealStoreDir() + std::string(path, store->storeDir.size());
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}
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FSAccessor::Stat stat(const Path & path) override
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{
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auto realPath = toRealPath(path);
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struct stat st;
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if (lstat(path.c_str(), &st)) {
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if (errno == ENOENT || errno == ENOTDIR) return {Type::tMissing, 0, false};
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throw SysError(format("getting status of ‘%1%’") % path);
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}
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if (!S_ISREG(st.st_mode) && !S_ISDIR(st.st_mode) && !S_ISLNK(st.st_mode))
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throw Error(format("file ‘%1%’ has unsupported type") % path);
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return {
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S_ISREG(st.st_mode) ? Type::tRegular :
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S_ISLNK(st.st_mode) ? Type::tSymlink :
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Type::tDirectory,
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S_ISREG(st.st_mode) ? (uint64_t) st.st_size : 0,
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S_ISREG(st.st_mode) && st.st_mode & S_IXUSR};
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}
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StringSet readDirectory(const Path & path) override
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{
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auto realPath = toRealPath(path);
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auto entries = nix::readDirectory(path);
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StringSet res;
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for (auto & entry : entries)
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res.insert(entry.name);
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return res;
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}
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std::string readFile(const Path & path) override
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{
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return nix::readFile(toRealPath(path));
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}
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std::string readLink(const Path & path) override
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{
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return nix::readLink(toRealPath(path));
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}
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};
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ref<FSAccessor> LocalFSStore::getFSAccessor()
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{
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return make_ref<LocalStoreAccessor>(ref<LocalFSStore>(std::dynamic_pointer_cast<LocalFSStore>(shared_from_this())));
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}
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void LocalFSStore::narFromPath(const Path & path, Sink & sink)
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{
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if (!isValidPath(path))
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throw Error(format("path ‘%s’ is not valid") % path);
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dumpPath(getRealStoreDir() + std::string(path, storeDir.size()), sink);
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}
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const string LocalFSStore::drvsLogDir = "drvs";
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std::shared_ptr<std::string> LocalFSStore::getBuildLog(const Path & path_)
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{
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auto path(path_);
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assertStorePath(path);
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if (!isDerivation(path)) {
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try {
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path = queryPathInfo(path)->deriver;
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} catch (InvalidPath &) {
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return nullptr;
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}
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if (path == "") return nullptr;
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}
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string baseName = baseNameOf(path);
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for (int j = 0; j < 2; j++) {
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Path logPath =
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j == 0
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? fmt("%s/%s/%s/%s", logDir, drvsLogDir, string(baseName, 0, 2), string(baseName, 2))
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: fmt("%s/%s/%s", logDir, drvsLogDir, baseName);
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Path logBz2Path = logPath + ".bz2";
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if (pathExists(logPath))
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return std::make_shared<std::string>(readFile(logPath));
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else if (pathExists(logBz2Path)) {
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try {
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return decompress("bzip2", readFile(logBz2Path));
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} catch (Error &) { }
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}
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}
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return nullptr;
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}
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}
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