Re: [PATCH] http: honor no_http env variable to bypass proxy

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Junio C Hamano <gitster@xxxxxxxxx> writes:

Second call for help.  I hate having to revert 30f302f7 (Merge
branch 'kf/http-proxy-auth-methods', 2016-02-03) this late in the
cycle.

> Jiang Xin <worldhello.net@xxxxxxxxx> writes:
>
>> From: Jiang Xin <xin.jiang@xxxxxxxxxx>
>>
>> Curl and its families honor several proxy related environment variables:
>>
>> * http_proxy and https_proxy define proxy for http/https connections.
>> * no_proxy (a comma separated hosts) defines hosts bypass the proxy.
>>
>> This command will bypass the bad-proxy and connect to the host directly:
>>
>>     no_proxy=* https_proxy=http://bad-proxy/ \
>>     curl -sk https://google.com/
>>
>> Before commit 372370f (http: use credential API to handle proxy auth...),
>> Environment variable "no_proxy" will take effect if the config variable
>> "http.proxy" is not set.  So the following comamnd won't fail if not
>> behind a firewall.
>>
>>     no_proxy=* https_proxy=http://bad-proxy/ \
>>     git ls-remote https://github.com/git/git
>>
>> But commit 372370f not only read git config variable "http.proxy", but
>> also read "http_proxy" and "https_proxy" environment variables, and set
>> the curl option using:
>>
>>     curl_easy_setopt(result, CURLOPT_PROXY, proxy_auth.host);
>>
>> This caused "no_proxy" environment variable not working any more.
>>
>> Set extra curl option "CURLOPT_NOPROXY" will fix this issue.
>>
>> Signed-off-by: Jiang Xin <xin.jiang@xxxxxxxxxx>
>> ---
>>  http.c | 6 ++++++
>>  1 file changed, 6 insertions(+)
>
> Sounds sensible; I am guessing that this is 2.8.0-rc0 regression
> that we need to fast-track?
>
> Knut, does this look good?
>
> Thanks.
>
>> diff --git a/http.c b/http.c
>> index 1d5e3bb..69da445 100644
>> --- a/http.c
>> +++ b/http.c
>> @@ -70,6 +70,7 @@ static long curl_low_speed_limit = -1;
>>  static long curl_low_speed_time = -1;
>>  static int curl_ftp_no_epsv;
>>  static const char *curl_http_proxy;
>> +static const char *curl_no_proxy;
>>  static const char *http_proxy_authmethod;
>>  static struct {
>>  	const char *name;
>> @@ -624,6 +625,11 @@ static CURL *get_curl_handle(void)
>>  		}
>>  
>>  		curl_easy_setopt(result, CURLOPT_PROXY, proxy_auth.host);
>> +#if LIBCURL_VERSION_NUM >= 0x071304
>> +		var_override(&curl_no_proxy, getenv("NO_PROXY"));
>> +		var_override(&curl_no_proxy, getenv("no_proxy"));
>> +		curl_easy_setopt(result, CURLOPT_NOPROXY, curl_no_proxy);
>> +#endif
>>  	}
>>  	init_curl_proxy_auth(result);
--
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