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https://github.com/NixOS/nix.git
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e4f62e4608
* It is tough to contribute to a project that doesn't use a formatter, * It is extra hard to contribute to a project which has configured the formatter, but ignores it for some files * Code formatting makes it harder to hide obscure / weird bugs by accident or on purpose, Let's rip the bandaid off? Note that PRs currently in flight should be able to be merged relatively easily by applying `clang-format` to their tip prior to merge.
46 lines
1.4 KiB
C++
46 lines
1.4 KiB
C++
#include "nix/store/builtins.hh"
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#include "nix/util/tarfile.hh"
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namespace nix {
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static void builtinUnpackChannel(const BuiltinBuilderContext & ctx)
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{
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auto getAttr = [&](const std::string & name) -> const std::string & {
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auto i = ctx.drv.env.find(name);
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if (i == ctx.drv.env.end())
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throw Error("attribute '%s' missing", name);
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return i->second;
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};
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std::filesystem::path out{ctx.outputs.at("out")};
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auto & channelName = getAttr("channelName");
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auto & src = getAttr("src");
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if (std::filesystem::path{channelName}.filename().string() != channelName) {
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throw Error("channelName is not allowed to contain filesystem separators, got %1%", channelName);
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}
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createDirs(out);
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unpackTarfile(src, out);
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size_t fileCount;
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std::string fileName;
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auto entries = DirectoryIterator{out};
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fileName = entries->path().string();
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fileCount = std::distance(entries.begin(), entries.end());
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if (fileCount != 1)
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throw Error("channel tarball '%s' contains more than one file", src);
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auto target = out / channelName;
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try {
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std::filesystem::rename(fileName, target);
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} catch (std::filesystem::filesystem_error &) {
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throw SysError("failed to rename %1% to %2%", fileName, target.string());
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}
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}
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static RegisterBuiltinBuilder registerUnpackChannel("unpack-channel", builtinUnpackChannel);
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} // namespace nix
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