misc/pprof: don't rely on either just LWP::UserAgent or just curl

[cldorian]

Since CL 13085043, pprof is broken on OS X Version 10.8.4.

What steps will reproduce the problem?
go tool pprof

What is the expected output?


What do you see instead?

Can't locate LWP/UserAgent.pm in @INC (@INC contains:
/opt/local/lib/perl5/site_perl/5.12.4/darwin-thread-multi-2level
/opt/local/lib/perl5/site_perl/5.12.4
/opt/local/lib/perl5/vendor_perl/5.12.4/darwin-thread-multi-2level
/opt/local/lib/perl5/vendor_perl/5.12.4
/opt/local/lib/perl5/5.12.4/darwin-thread-multi-2level /opt/local/lib/perl5/5.12.4
/opt/local/lib/perl5/site_perl /opt/local/lib/perl5/vendor_perl .) at
/Users/charles/go/pkg/tool/darwin_amd64/pprof line 82.
BEGIN failed--compilation aborted at /Users/charles/go/pkg/tool/darwin_amd64/pprof line
82.

Which compiler are you using (5g, 6g, 8g, gccgo)?
6g (but N/A)

Which operating system are you using?
OS x Version 10.8.4

Which version are you using?  (run 'go version')
go version devel +0ff127f41a08 Wed Aug 28 14:43:56 2013 +1000 darwin/amd64

Please provide any additional information below.
mb:~ charles$ perl -v
This is perl 5, version 12, subversion 4 (v5.12.4) built for darwin-thread-multi-2level

UserAgent.pm found in /opt/local/lib/perl5/5.12.4/CPAN/LWP/

[bradfitz]

Comment 1:

Sigh.  I was going to complain about this too on the earlier CL which I approved, since
I knew LWP::UserAgent wasn't part of the Perl standard library, but on every machine I
could find, it was installed, so I figured all distros (including Macs) just installed
it anyway these days.
But at home I have a Mac without it, so I guess not.
Will fix.

Owner changed to @bradfitz.

Status changed to Accepted.

[dvyukov]

Comment 3:

Is not it easier to rewrite pprof in Go?

[bradfitz]

Comment 4:

Easier or less time consuming? And for whom?
I don't have time to rewrite it in Go.
Here's the perl fix:  https://golang.org/cl/13330044/

Status changed to Started.

[dvyukov]

Comment 5:

I meant:
- easier to maintain, more consistent with the rest of Go toolchain
- better for users (on windows you do not have perl by default)

[bradfitz]

Comment 6:

I 100% agree. I filed issue #6281 for that.  I'm not doing it now.

[bradfitz]

Comment 7:

This issue was closed by revision ccfe1bf.

Status changed to Fixed.