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builtins.unpackChannel: wrap filesystem errors and sanitize channelName

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Otherwise these errors are not caught correctly
This commit is contained in:
Jörg Thalheim 2024-09-05 12:59:54 +02:00
parent 05a1ffe236
commit 70c52d72f4
1 changed files with 22 additions and 6 deletions
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28
src/libstore/builtins/unpack-channel.cc
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@ -13,21 +13,37 @@ void builtinUnpackChannel(
return i->second;
};
auto out = outputs.at("out");
auto channelName = getAttr("channelName");
std::filesystem::path out(outputs.at("out"));
std::filesystem::path channelName(getAttr("channelName"));
auto src = getAttr("src");
if (channelName.filename() != channelName) {
throw Error("channelName is not allowed to contain filesystem seperators, got %1%", channelName);
}
createDirs(out);
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 = std::filesystem::directory_iterator{out};
fileName = entries->path().string();
fileCount = std::distance(std::filesystem::begin(entries), std::filesystem::end(entries));
} catch (std::filesystem::filesystem_error &e) {
throw SysError("failed to read directory %1%", out);
}
if (fileCount != 1)
throw Error("channel tarball '%s' contains more than one file", src);
std::filesystem::rename(fileName, (out + "/" + channelName));
std::filesystem::path target(out / channelName);
try {
std::filesystem::rename(fileName, target);
} catch (std::filesystem::filesystem_error &e) {
throw SysError("failed to rename %1% to %2%", fileName, target);
}
}
}