RE: [OctDev] automatic download of forge packages

[Jake]

Well I guess that's one less thing for me to do then.

-Jake 

-----Original Message-----
From: Jaroslav Hajek [mailto:address@hidden 
Sent: Monday, June 07, 2010 4:01 AM
To: Octave Maintainers List; octave-forge list
Subject: [OctDev] automatic download of forge packages

hi all,

I was feeling playful today, so I tinkered a bit with pkg and OctaveForge.
The result is upstream:
http://hg.savannah.gnu.org/hgweb/octave/rev/76aba4305f1f

Summary:
pkg now accepts a -forge switch, only allowed with the "install" action.

octave:1> pkg list
Package Name    | Version | Installation directory
----------------+---------+-----------------------
       general *|   1.2.1 | /home/hajek/octave/general-1.2.1
 generate_html  |   0.1.3 | /home/hajek/octave/generate_html-0.1.3
linear-algebra *|   2.0.0 | /home/hajek/octave/linear-algebra-2.0.0
       nlwing2  |   1.2.0 | /home/hajek/octave/nlwing2-1.2.0
        octgpr  |   1.2.0 | /home/hajek/octave/octgpr-1.2.0

octave:2> pkg install -forge image

octave:3> pkg list
Package Name    | Version | Installation directory
----------------+---------+-----------------------
       general *|   1.2.1 | /home/hajek/octave/general-1.2.1
 generate_html  |   0.1.3 | /home/hajek/octave/generate_html-0.1.3
         image *|  1.0.13 | /home/hajek/octave/image-1.0.13
linear-algebra *|   2.0.0 | /home/hajek/octave/linear-algebra-2.0.0
       nlwing2  |   1.2.0 | /home/hajek/octave/nlwing2-1.2.0
        octgpr  |   1.2.0 | /home/hajek/octave/octgpr-1.2.0

Retrieving the current version as well as a download URL from the web is
handled by a separate function get_forge_pkg. It attempts to query the
package's index page, then greps for the proper info. it errors out if
unsuccessful, possibly suggesting correction of misspelled package name.


octave:4> pkg install -forge miscelaneous
error: get_forge_pkg: package not found: "miscelaneous". Maybe you meant
"miscellaneous?"
error: called from:
error:   /home/hajek/devel/octave/main/scripts/pkg/get_forge_pkg.m at
line 71, column 9
error:   /home/hajek/devel/octave/main/scripts/pkg/pkg.m at line 2329,
column 15
error:   /home/hajek/devel/octave/main/scripts/pkg/pkg.m at line 300, column
32


octave:4> pkg install -forge '~/hhome/general-1.2.1.tar.gz'
error: get_forge_pkg: invalid package name: ~/hhome/general-1.2.1.tar.gz
error: called from:
error:   /home/hajek/devel/octave/main/scripts/pkg/get_forge_pkg.m at
line 32, column 5
error:   /home/hajek/devel/octave/main/scripts/pkg/pkg.m at line 2329,
column 15
error:   /home/hajek/devel/octave/main/scripts/pkg/pkg.m at line 300, column
32

octave:4> system ("sudo /sbin/ifdown eth0") hajek's password:
    eth0      device: Realtek Semiconductor Co., Ltd. RTL8111/8168B
PCI Express Gigabit Ethernet controller (rev 01) ans = 0

octave:5> pkg install -forge miscellaneous
error: get_forge_pkg: could not read URL, please verify internet connection
error: called from:
error:   /home/hajek/devel/octave/main/scripts/pkg/get_forge_pkg.m at
line 74, column 7
error:   /home/hajek/devel/octave/main/scripts/pkg/pkg.m at line 2329,
column 15
error:   /home/hajek/devel/octave/main/scripts/pkg/pkg.m at line 300, column
32

open questions:
1. Maybe there should be some indicator that the web is being accessed,
although the user has explicitly asked for it?
2. get_forge_pkg is quite simplistic and will easily be fooled by major
OctaveForge web interface changes. Is it worth trying to implement something
more generic? Or can we simply say that we'll change this function as
needed, should such changes ever occur again?
3. Obviously, I'll be glad if others can check my code and possibly improve
it.

--
RNDr. Jaroslav Hajek, PhD
computing expert & GNU Octave developer
Aeronautical Research and Test Institute (VZLU) Prague, Czech Republic
url: www.highegg.matfyz.cz

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