bacpac: pacman-independent package downloader with dep resolution

Xyne · 2013-03-22 01:03:31

Project page: http://xyne.archlinux.ca/projects/bacpac/

Bacpac is a pacman-independent package downloader with dependency resolution. It will run on any system with a working Python 3 interpreter. It is meant to aid system recovery if an Arch Linux live CD is unavailable.*

As usual, comments, questions, suggestions and other feedback are welcome.

* Well, that's the official reason. The real reason is that I wanted to do something with the JSON package info interface.

edit: updated after packaging

Last edited by Xyne (2013-03-30 15:13:37)

Jristz · 2013-03-22 01:37:09

this script can by used as a backup in case that pacman is broken in any sistem and need reinstall, because not suffer from the
.so bump from curl that can by broken pacman, right??

I like the idea and about the name...
why not tracker because track from the internet the packages
or nameless as THE name

cfr · 2013-03-22 02:17:50

There is already a tracker (something to do with gnome).

vacpac?

Trilby · 2013-03-22 02:21:51

vacpac? What would the tagline be "it sucks more than pacman"?

Jristz · 2013-03-22 02:39:03

pacrat
is simple and copy the pacman name whitout being pacman at same time

drcouzelis · 2013-03-22 03:00:36

Xyne wrote:

feel free to vote and suggest others

Real vote: paxyne package manager

Joke vote: pacmanjr

ewaller · 2013-03-22 03:31:24

How about: Blinky? Pinky? Inky? Clyde?

Edit: Never mind, I did not read the OP as throughly as I should have.

Last edited by ewaller (2013-03-22 03:32:22)

Xyne · 2013-03-22 19:04:26

Jristz wrote:

this script can by used as a backup in case that pacman is broken in any sistem and need reinstall, because not suffer from the
.so bump from curl that can by broken pacman, right??

It can be used to download packages for manual installation on a given system if Python 3 works.
If Python 3 is broken then you can run it on a different system (without Pacman) to download the packages.

As for names, I like pacrat so far.

cfr · 2013-03-22 21:59:13

Won't that require a paccat?

Jristz · 2013-03-22 22:21:52

cfr wrote:

Won't that require a paccat?

and a pacdog too, and a pacowner that own pacdog and paccat, and a pacdoctor for cure paccat and pacdog, and paccheese for pacrat

Enought off pactopic

but I not underestand at all, how pacrat download the package??

Xyne · 2013-03-23 05:25:40

Jristz wrote:

but I not underestand at all, how pacrat download the package??

pacmagic

Open it and look at the code.
Basically, it uses the package JSON interface to get the filename and dependencies, then it uses the mirror JSON interface to get a mirror and determine the package URL.

MagicSkyFairy · 2013-03-23 05:43:23

pacboy LOL

stryder · 2013-03-24 04:54:28

bacpac

as in the backup pacman.

MagicSkyFairy · 2013-03-24 05:44:09

stryder wrote:

bacpac
as in the backup pacman.

I retract my response and second this.

Jristz · 2013-03-24 06:00:44

Xyne wrote:

.......
Basically, it uses the package JSON interface to get the filename and dependencies, then it uses the mirror JSON interface to get a mirror and determine the package URL.

And now I underestand correctly (look code + your descritpion was enought to know how work
thanks

I remain my Pacrat in the names

Xyne · 2013-03-24 06:46:51

I'm heavily leaning towards bacpak... the backup pacman that you can carry around with you.

Pacrat might be better for some sort of package rollback script.

progandy · 2013-03-24 08:46:00

Here is some code if you only have wget, sed, and chmod +x:

# get a static python interpreter with ssl support. 
wget -O "stacklessxl3.2-static" "http://pts-mini-gpl.googlecode.com/svn/trunk/staticpython/release/stacklessxl3.2-static"
chmod +x "stacklessxl3.2-static"
wget -O "bacpac.py" "http://xyne.archlinux.ca/scripts/pacman/nameless.py"
sed -i "s/, BrokenPipeError//" bacpac.py # 3.2 doesn't know BrokenPipeError
sed -i "s/python3/.\/stacklessxl3.2-static/" bacpac.py # use static interpreter
chmod +x bacpac.py
# run now bacpac.py PKGNAME ...

Last edited by progandy (2013-03-24 08:50:05)

Xyne · 2013-03-24 08:53:12

@progandy
Nice, thanks!

I've added two options: --gen-providers and --use-providers

The former creates a JSON database of providers for dependency resolution.
The latter is the option to use it.

Generation requires pyalpm but I intend to keep an up-to-date version of the providers file on my site for those without.

anonymous_user · 2013-03-24 13:24:25

stryder wrote:

bacpac
as in the backup pacman.

I am wondering if this would cause confusion with backpac although it serves a different function.

Last edited by anonymous_user (2013-03-24 13:24:51)

cfr · 2013-03-24 21:33:56

Trilby wrote:

vacpac? What would the tagline be "it sucks more than pacman"?

Possibly though I had in mind vacuum packed meals and the like because it sucks down packages which are then ready-to-use...

Xyne · 2013-03-30 15:15:58

This has been packaged now. I've gone with the name "bacpac". The "backpac" project does not appear to be active nor popular enough to risk considerable confusion.

Xyne · 2013-03-30 19:17:21

I have added more features to emulate pacman behavior. The main one is that it can extract packages to a given root directory and be used for basic package installation during system recovery.

Check the changelog for details.

progandy · 2013-03-30 20:10:38

Nice. If you want to remove the pyalpm dependency, know that the database is a tar archive of plain text files. You can read that with pythons tarfile module.

Xyne · 2013-03-30 20:30:13

progandy wrote:

Nice. If you want to remove the pyalpm dependency, know that the database is a tar archive of plain text files. You can read that with pythons tarfile module.

I'll consider it, but once I start down that route I may as well skip the JSON interface entirely and implement full database parsing, as most of the functionality would be required to get the providers array anyway.

chneukirchen · 2013-03-30 21:58:16

People will confuse it with bacman.

Arch Linux

#1 2013-03-22 01:03:31

bacpac: pacman-independent package downloader with dep resolution

#2 2013-03-22 01:37:09

Re: bacpac: pacman-independent package downloader with dep resolution

#3 2013-03-22 02:17:50

Re: bacpac: pacman-independent package downloader with dep resolution

#4 2013-03-22 02:21:51

Re: bacpac: pacman-independent package downloader with dep resolution

#5 2013-03-22 02:39:03

Re: bacpac: pacman-independent package downloader with dep resolution

#6 2013-03-22 03:00:36

Re: bacpac: pacman-independent package downloader with dep resolution

#7 2013-03-22 03:31:24

Re: bacpac: pacman-independent package downloader with dep resolution

#8 2013-03-22 19:04:26

Re: bacpac: pacman-independent package downloader with dep resolution

#9 2013-03-22 21:59:13

Re: bacpac: pacman-independent package downloader with dep resolution

#10 2013-03-22 22:21:52

Re: bacpac: pacman-independent package downloader with dep resolution

#11 2013-03-23 05:25:40

Re: bacpac: pacman-independent package downloader with dep resolution

#12 2013-03-23 05:43:23

Re: bacpac: pacman-independent package downloader with dep resolution

#13 2013-03-24 04:54:28

Re: bacpac: pacman-independent package downloader with dep resolution

#14 2013-03-24 05:44:09

Re: bacpac: pacman-independent package downloader with dep resolution

#15 2013-03-24 06:00:44

Re: bacpac: pacman-independent package downloader with dep resolution

#16 2013-03-24 06:46:51

Re: bacpac: pacman-independent package downloader with dep resolution

#17 2013-03-24 08:46:00

Re: bacpac: pacman-independent package downloader with dep resolution

#18 2013-03-24 08:53:12

Re: bacpac: pacman-independent package downloader with dep resolution

#19 2013-03-24 13:24:25

Re: bacpac: pacman-independent package downloader with dep resolution

#20 2013-03-24 21:33:56

Re: bacpac: pacman-independent package downloader with dep resolution

#21 2013-03-30 15:15:58

Re: bacpac: pacman-independent package downloader with dep resolution

#22 2013-03-30 19:17:21

Re: bacpac: pacman-independent package downloader with dep resolution

#23 2013-03-30 20:10:38

Re: bacpac: pacman-independent package downloader with dep resolution

#24 2013-03-30 20:30:13

Re: bacpac: pacman-independent package downloader with dep resolution

#25 2013-03-30 21:58:16

Re: bacpac: pacman-independent package downloader with dep resolution

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