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libutil: allow decompression with none/empty method

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The S3 store relies on the ability to be able to decompress things with
an empty method, because it just passes the value of the Content-Encoding
directly to decompress.

If the file is not compressed, then this will cause the compression
routine to get confused.

This caused NixOS/nixpkgs#120120.
This commit is contained in:
Luke Granger-Brown 2021-04-22 02:33:59 +00:00
parent 8d651a1f68
commit 97dde3cdd9
2 changed files with 21 additions and 1 deletions
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4
src/libutil/compression.cc
View file

@ -186,7 +186,9 @@ struct BrotliDecompressionSink : ChunkedCompressionSink
ref<std::string> decompress(const std::string & method, const std::string & in)
{
if (method == "br") {
if (method == "none" || method == "")
return make_ref<std::string>(in);
else if (method == "br") {
StringSink ssink;
auto sink = makeDecompressionSink(method, ssink);
(*sink)(in);

18
src/libutil/tests/compression.cc
View file

@ -17,6 +17,24 @@ namespace nix {
ASSERT_EQ(*o, "this-is-a-test");
}
TEST(decompress, decompressNoneCompressed) {
auto method = "none";
auto str = "slfja;sljfklsa;jfklsjfkl;sdjfkl;sadjfkl;sdjf;lsdfjsadlf";
ref<std::string> o = decompress(method, str);
ASSERT_EQ(*o, str);
}
TEST(decompress, decompressEmptyCompressed) {
// Empty-method decompression used e.g. by S3 store
// (Content-Encoding == "").
auto method = "";
auto str = "slfja;sljfklsa;jfklsjfkl;sdjfkl;sadjfkl;sdjf;lsdfjsadlf";
ref<std::string> o = decompress(method, str);
ASSERT_EQ(*o, str);
}
TEST(decompress, decompressXzCompressed) {
auto method = "xz";
auto str = "slfja;sljfklsa;jfklsjfkl;sdjfkl;sadjfkl;sdjf;lsdfjsadlf";