[PATCH] Print a more friendly message when http_proxy is down. - cabal-devel - Haskell.org

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[PATCH] Print a more friendly message when http_proxy is down.

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Nikita Karetnikov

25 Jul 2014 25 Jul '14

10:20 p.m.

An attempt to fix #1962. I think the exception comes from ‘connect’ in ‘Network.Socket’. I doubt that the proposed error message is friendly enough. Ideas? Also, can ‘handleJust’ catch ‘IOException’s that are not related to http_proxy?

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0001-Print-a-more-friendly-message-when-http_proxy-is-dow.patch (text/x-diff — 2.0 KB)
attachment.sig (application/pgp-signature — 835 bytes)

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Mikhail Glushenkov

25 Jul 25 Jul

10:56 p.m.

Hi, On 26 July 2014 00:20, Nikita Karetnikov wrote:

An attempt to fix #1962. I think the exception comes from ‘connect’ in ‘Network.Socket’.

Perhaps it's better to solve this in HTTP itself? It gives decent error messages in other cases: $ export HTTP_PROXY=foo $ cabal update Downloading the latest package list from hackage.haskell.org cabal: openTCPConnection: host lookup failure for "foo" $ export HTTP_PROXY=http://localhost:3128 $ cabal update Downloading the latest package list from hackage.haskell.org cabal: does not exist

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Nikita Karetnikov

26 Jul 26 Jul

6:55 a.m.

Perhaps it's better to solve this in HTTP itself?

I think so.

cabal: openTCPConnection: host lookup failure for "foo"

What version of network is it? I ran ‘grep -r “host lookup failure”’ on the source of 2.5.0.0 and didn’t find anything.

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Mikhail Glushenkov

8:15 a.m.

Hi, On 26 July 2014 08:55, Nikita Karetnikov wrote:

What version of network is it? I ran ‘grep -r “host lookup failure”’ on the source of 2.5.0.0 and didn’t find anything.

$ cabal sandbox hc-pkg list | grep network network-2.5.0.0 It probably uses perror or something like it.

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Brandon Allbery

3:01 p.m.

On Sat, Jul 26, 2014 at 4:15 AM, Mikhail Glushenkov < the.dead.shall.rise@gmail.com> wrote:

On 26 July 2014 08:55, Nikita Karetnikov wrote:

...
What version of network is it? I ran ‘grep -r “host lookup failure”’ on the source of 2.5.0.0 and didn’t find anything.

$ cabal sandbox hc-pkg list | grep network network-2.5.0.0

It probably uses perror or something like it.

gai_strerror(3) or hstrerror(3) depending on whether ipv6 support was found or not, I'd think. -- brandon s allbery kf8nh sine nomine associates allbery.b@gmail.com ballbery@sinenomine.net unix, openafs, kerberos, infrastructure, xmonad http://sinenomine.net

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Brandon Allbery
Mikhail Glushenkov
Nikita Karetnikov