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remote-curl: accept all encodings supported by curl

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Configure curl to accept all encodings which curl supports instead of
only accepting gzip responses.

This fixes an issue when using an installation of curl which is built
without the "zlib" feature. Since aa90b9697 (Enable info/refs gzip
decompression in HTTP client, 2012-09-19) we end up requesting "gzip"
encoding anyway despite libcurl not being able to decode it.  Worse,
instead of getting a clear error message indicating so, we end up
falling back to "dumb" http, producing a confusing and difficult to
debug result.

Since curl doesn't do any checking to verify that it supports the a
requested encoding, instead set the curl option `CURLOPT_ENCODING` with
an empty string indicating that curl should send an "Accept-Encoding"
header containing only the encodings supported by curl.

Reported-by: Anton Golubev <anton.golubev@gmail.com>
Signed-off-by: Brandon Williams <bmwill@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Brandon Williams 2018-05-22 11:42:03 -07:00 committed by Junio C Hamano
parent ccdcbd54c4
commit 1a53e692af
3 changed files with 11 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
http.c
View File

@ -1788,7 +1788,7 @@ static int http_request(const char *url,
curl_easy_setopt(slot->curl, CURLOPT_URL, url);
curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "gzip");
curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "");
ret = run_one_slot(slot, &results);

2
remote-curl.c
View File

@ -684,7 +684,7 @@ retry:
curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "gzip");
curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "");
if (large_request) {
/* The request body is large and the size cannot be predicted.

13
t/t5551-http-fetch-smart.sh
View File

@ -26,14 +26,14 @@ setup_askpass_helper
cat >exp <<EOF
> GET /smart/repo.git/info/refs?service=git-upload-pack HTTP/1.1
> Accept: */*
> Accept-Encoding: gzip
> Accept-Encoding: ENCODINGS
> Pragma: no-cache
< HTTP/1.1 200 OK
< Pragma: no-cache
< Cache-Control: no-cache, max-age=0, must-revalidate
< Content-Type: application/x-git-upload-pack-advertisement
> POST /smart/repo.git/git-upload-pack HTTP/1.1
> Accept-Encoding: gzip
> Accept-Encoding: ENCODINGS
> Content-Type: application/x-git-upload-pack-request
> Accept: application/x-git-upload-pack-result
> Content-Length: xxx
@ -79,8 +79,13 @@ test_expect_success 'clone http repository' '
/^< Date: /d
/^< Content-Length: /d
/^< Transfer-Encoding: /d
" >act &&
test_cmp exp act
" >actual &&
sed -e "s/^> Accept-Encoding: .*/> Accept-Encoding: ENCODINGS/" \
actual >actual.smudged &&
test_cmp exp actual.smudged &&
grep "Accept-Encoding:.*gzip" actual >actual.gzip &&
test_line_count = 2 actual.gzip
'
test_expect_success 'fetch changes via http' '