Date: Thu, 11 Feb 2010 21:31:26 +0200 From: Giorgos Keramidas <keramida@ceid.upatras.gr> To: Adam Vande More <amvandemore@gmail.com> Cc: freebsd-questions@freebsd.org Subject: Re: python script to backup installed packages Message-ID: <87d40btvqp.fsf@kobe.laptop> In-Reply-To: <6201873e1002110815l312da12fr5388956f32465516@mail.gmail.com> (Adam Vande More's message of "Thu, 11 Feb 2010 10:15:12 -0600") References: <6201873e1002110815l312da12fr5388956f32465516@mail.gmail.com>
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On Thu, 11 Feb 2010 10:15:12 -0600, Adam Vande More <amvandemore@gmail.com> wrote:
> Sometimes you have need to backup installed packages. I realize most
> port management tools do this automatically, but if you're on a system
> with a lot of packages installed and one port management tool fails
> and you use another to fix it, /usr/ports/packages can become jumbled.
>
> Anyways, I've written a simple python script which will create a fresh
> snapshot of all installed packages. These are convenient for backups
> or installing on a new system.
>
> For anyone interested:
>
> from subprocess import Popen, PIPE
> import os
> s = Popen('pkg_info -a | grep : | grep
> Information',shell=True,stdout=PIPE).communicate()[0]
>
> pkg_location = '/data/packages'
>
> packages = []
> for line in s.split('\n'):
> info = line.replace('Information for ', '').replace(':','')
> packages.append(info)
>
> os.chdir(pkg_location)
>
> for package in packages:
> s = Popen('pkg_create -b ' +
> package,shell=True,stdout=PIPE).communicate()[0]
Nice script!
My own version was initially written in sh(1) to avoid having a Python
dependency. Then I rewrote it in Python too. FWIW, you can probably
save a few replace() calls and avoid the need for a full array of all
the packages by yielding the package names:
from subprocess import PIPE, Popen as popen
def listpackages():
for l in iter(popen("pkg_info", shell=True, stdout=PIPE).stdout.readline, ""):
yield l.split()[0]
for p in listpackages():
dostuff(p)
My own version groks an os.environ['EXTRA_PKG_CREATE_ARGS'] option too
and inserts the extra options before the ["-b", "package"] arguments of
pkg_create, so that I can run the script for example with:
env EXTRA_PKG_CREATE_ARGS='-Rvn' ./savepkg.py
This way package dependencies are saved too (-R option), the output of
the `pkg_create -b' command is slightly more verbose, and saving the
same package multiple times doesn't overwrite existing packages of the
same version (-n option).
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