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libstore: remove github etag workaround

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this was a workaround for a *github* bug that happend *in 2015*.
not only is github no longer buggy, it shouldn't have been nix's
responsibility to work around these bugs like this to begin with

while we're at it we'll also remove another workaround—again for
github specifically and again for etag handling—from 2021 that's
also not needed any more. future workarounds for serverside bugs
should probably come with an expiration date that mutates into a
build warning after a while, otherwise this *will* happen again.

Change-Id: I74f739ae3e36d40350f78bebcb5869aa8cc9adcd
This commit is contained in:
eldritch horrors 2024-04-22 21:03:02 +02:00
parent 7063170d5f
commit 257d7ffa7b
1 changed files with 0 additions and 23 deletions
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23
src/libstore/filetransfer.cc
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@ -204,17 +204,6 @@ struct curlFileTransfer : public FileTransfer
if (name == "etag") {
result.etag = trim(line.substr(i + 1));
/* Hack to work around a GitHub bug: it sends
ETags, but ignores If-None-Match. So if we get
the expected ETag on a 200 response, then shut
down the connection because we already have the
data. */
long httpStatus = 0;
curl_easy_getinfo(req, CURLINFO_RESPONSE_CODE, &httpStatus);
if (result.etag == request.expectedETag && httpStatus == 200) {
debug("shutting down on 200 HTTP response with expected ETag");
return 0;
}
}
else if (name == "content-encoding")
@ -375,24 +364,12 @@ struct curlFileTransfer : public FileTransfer
}
}
if (code == CURLE_WRITE_ERROR && result.etag == request.expectedETag) {
code = CURLE_OK;
httpStatus = 304;
}
if (writeException)
failEx(writeException);
else if (code == CURLE_OK && successfulStatuses.count(httpStatus))
{
result.cached = httpStatus == 304;
// In 2021, GitHub responds to If-None-Match with 304,
// but omits ETag. We just use the If-None-Match etag
// since 304 implies they are the same.
if (httpStatus == 304 && result.etag == "")
result.etag = request.expectedETag;
act.progress(result.bodySize, result.bodySize);
done = true;
callback(std::move(result));