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python-apt create_pin question

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  python-apt create_pin question Antonio Russo <aerusso@aerusso.net> - 2022-01-14 16:40 +0100
    Re: python-apt create_pin question Andrei POPESCU <andreimpopescu@gmail.com> - 2022-01-15 18:40 +0100
    Re: python-apt create_pin question Michael Lange <klappnase@freenet.de> - 2022-01-17 11:10 +0100
      Re: python-apt create_pin question Antonio Russo <aerusso@aerusso.net> - 2022-01-17 16:20 +0100

#243985 — python-apt create_pin question

Hello!

I'm trying to use apt_pkg to get a "best candidate" for a package, but with
slightly different constraints than I have set up in /etc/apt/preferences.d.

I am trying to use Policy.create_pin to do so, but cannot seem to get it working:

import apt_pkg

apt_pkg.init()
cache = apt_pkg.Cache(progress=None)
policy = apt_pkg.Policy(cache)
#policy.create_pin('origin', '', 'Debian', -1)
policy.create_pin('origin', 'apt', 'Debian', -1)
policy.init_defaults()

print([ (v, policy.get_priority(v)) for v in cache['apt'].version_list ])


All calls to get_priority return 500---not -1, as I am trying to get here.

I must be doing something silly.  I'd appreciate any help.

Best,
Antonio

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#244021

[Multipart message — attachments visible in raw view] — view raw

On Vi, 14 ian 22, 08:09:30, Antonio Russo wrote:
> 
> Hello!
> 
> I'm trying to use apt_pkg to get a "best candidate" for a package, but with
> slightly different constraints than I have set up in /etc/apt/preferences.d.
> 
> I am trying to use Policy.create_pin to do so, but cannot seem to get it working:
> 
> import apt_pkg
> 
> apt_pkg.init()
> cache = apt_pkg.Cache(progress=None)
> policy = apt_pkg.Policy(cache)
> #policy.create_pin('origin', '', 'Debian', -1)
> policy.create_pin('origin', 'apt', 'Debian', -1)
> policy.init_defaults()
> 
> print([ (v, policy.get_priority(v)) for v in cache['apt'].version_list ])
> 
> 
> All calls to get_priority return 500---not -1, as I am trying to get here.
> 
> I must be doing something silly.  I'd appreciate any help.

If you don't get an answer in a few more days you should probably try 
asking on https://lists.debian.org/deity instead.

Kind regards,
Andrei
-- 
http://wiki.debian.org/FAQsFromDebianUser

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#244111

Hi,

On Fri, 14 Jan 2022 08:09:30 -0700
Antonio Russo <aerusso@aerusso.net> wrote:

(...)
> I am trying to use Policy.create_pin to do so, but cannot seem to get
> it working:
> 
> import apt_pkg
> 
> apt_pkg.init()
> cache = apt_pkg.Cache(progress=None)
> policy = apt_pkg.Policy(cache)
> #policy.create_pin('origin', '', 'Debian', -1)
> policy.create_pin('origin', 'apt', 'Debian', -1)
> policy.init_defaults()

(...)
> All calls to get_priority return 500---not -1, as I am trying to get
> here.
> 
> I must be doing something silly.  I'd appreciate any help.

just a shot into the dark:
According to
https://apt-team.pages.debian.net/python-apt/library/apt_pkg.html :

    "The parameter type refers to one of the strings ‘Version’, ‘Release’,
     or ‘Origin’. "

So maybe this argument is case sensitive and changing "origin" into
"Origin" may fix the issue?

Best regards

Michael

.-.. .. ...- .   .-.. --- -. --.   .- -. -..   .--. .-. --- ... .--. . .-.

Not one hundred percent efficient, of course ... but nothing ever is.
		-- Kirk, "Metamorphosis", stardate 3219.8

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#244125

On 1/17/22 02:54, Michael Lange wrote:
(...)
> 
> So maybe this argument is case sensitive and changing "origin" into
> "Origin" may fix the issue?
> 

Hello Michael,

Thanks for the suggestion.  Unfortunately it does not work.  I had actually
dug into the source a tiny bit before posting:

Unlike the file parsing interface (ReadPinfile) in libapt, which performs a
case-insensitive compare, the Python interface to CreatePin checks for
either "Origin" or "origin":

static PyObject *policy_create_pin(PyObject *self, PyObject *args) {
    pkgVersionMatch::MatchType match_type;
    const char *type, *pkg, *data;
    signed short priority;
    if (PyArg_ParseTuple(args, "sssh", &type, &pkg, &data, &priority) == 0)
        return 0;
    pkgPolicy *policy = GetCpp<pkgPolicy *>(self);
    if (strcmp(type,"Version") == 0 || strcmp(type, "version") == 0)
        match_type = pkgVersionMatch::Version;
    else if (strcmp(type,"Release") == 0 || strcmp(type, "release") == 0)
        match_type = pkgVersionMatch::Release;
    else if (strcmp(type,"Origin") == 0 || strcmp(type, "origin") == 0)
        match_type = pkgVersionMatch::Origin;
    else
        match_type = pkgVersionMatch::None;
    policy->CreatePin(match_type,pkg,data,priority);
    HandleErrors();
    Py_RETURN_NONE;
}

Direct re-testing also fails.

Best,
Antonio

> Best regards
> 
> Michael

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