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Merge pull request #11378 from Mic92/nix-dir-errors

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builtins.readDir: fix nix error trace on filesystem errors
This commit is contained in:
John Ericson 2024-09-11 13:10:28 -04:00 • committed by GitHub
commit db7c868d24
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6 changed files with 92 additions and 40 deletions
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40
src/libstore/builtins/unpack-channel.cc
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@ -3,31 +3,53 @@
namespace nix {
namespace fs { using namespace std::filesystem; }
void builtinUnpackChannel(
const BasicDerivation & drv,
const std::map<std::string, Path> & outputs)
{
auto getAttr = [&](const std::string & name) {
auto getAttr = [&](const std::string & name) -> const std::string & {
auto i = drv.env.find(name);
if (i == drv.env.end()) throw Error("attribute '%s' missing", name);
return i->second;
};
auto out = outputs.at("out");
auto channelName = getAttr("channelName");
auto src = getAttr("src");
fs::path out{outputs.at("out")};
auto & channelName = getAttr("channelName");
auto & src = getAttr("src");
createDirs(out);
if (fs::path{channelName}.filename().string() != channelName) {
throw Error("channelName is not allowed to contain filesystem seperators, got %1%", channelName);
}
try {
fs::create_directories(out);
} catch (fs::filesystem_error &) {
throw SysError("creating directory '%1%'", out.string());
}
unpackTarfile(src, out);
auto entries = std::filesystem::directory_iterator{out};
auto fileName = entries->path().string();
auto fileCount = std::distance(std::filesystem::begin(entries), std::filesystem::end(entries));
size_t fileCount;
std::string fileName;
try {
auto entries = fs::directory_iterator{out};
fileName = entries->path().string();
fileCount = std::distance(fs::begin(entries), fs::end(entries));
} catch (fs::filesystem_error &) {
throw SysError("failed to read directory %1%", out.string());
}
if (fileCount != 1)
throw Error("channel tarball '%s' contains more than one file", src);
std::filesystem::rename(fileName, (out + "/" + channelName));
auto target = out / channelName;
try {
fs::rename(fileName, target);
} catch (fs::filesystem_error &) {
throw SysError("failed to rename %1% to %2%", fileName, target.string());
}
}
}