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What means "<<" in dependencies at packages.debian.org?

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  What means "<<" in dependencies at packages.debian.org? Kent West <westk@acu.edu> - 2019-03-10 20:20 +0100
    Re: What means "<<" in dependencies at packages.debian.org? Kent West <westk@acu.edu> - 2019-03-10 20:40 +0100
    Re: What means "<<" in dependencies at packages.debian.org? Andreas Ronnquist <mailinglists@gusnan.se> - 2019-03-10 20:40 +0100
    Re: What means "<<" in dependencies at packages.debian.org? Tomaž Šolc <tomaz.solc@tablix.org> - 2019-03-10 21:20 +0100

#206125 — What means "<<" in dependencies at packages.debian.org?

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Example: https://packages.debian.org/sid/python3-kivy

-
>
> dep: python3 <https://packages.debian.org/sid/python3> (<< 3.7) dep:
> python3 <https://packages.debian.org/sid/python3> (>= 3.5~)


The ">=" surely means "greater than or equal to", but what is "<<"? "less
than or less than"?

Even more interesting is that "aptitude install python3-kivy" only shows
one "<" (which makes sense to me as "less than"):

The following packages have unmet dependencies:
>  python3-kivy : Depends: python3 (< 3.7) but 3.7.2-1 is installed
>

and in the description of the package in the aptitude console:

Depends: python3-gst-1.0, python3 (< 3.7), python3 (>= 3.5~), ...
>

It's not a typo, unless other pages have similar typos (sometimes being
">>" - "greater than or greater than"?).

Also, is the answer documented somewhere? I've researched unproductively
for several hours.

Thanks!

-- 
Kent West                    <")))><
Westing Peacefully - http://kentwest.blogspot.com

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#206126

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On Sun, Mar 10, 2019 at 2:24 PM Andreas Ronnquist <mailinglists@gusnan.se>
wrote:

> On Sun, 10 Mar 2019 14:14:52 -0500,
> Kent West<westk@acu.edu> wrote:
>
> >Example: https://packages.debian.org/sid/python3-kivy
> >
> >-
> >>
> >> dep: python3 <https://packages.debian.org/sid/python3> (<< 3.7) dep:
> >> python3 <https://packages.debian.org/sid/python3> (>= 3.5~)
> >
> >
> >The ">=" surely means "greater than or equal to", but what is "<<"?
> >"less than or less than"?
> >
> >Even more interesting is that "aptitude install python3-kivy" only
> >shows one "<" (which makes sense to me as "less than"):
> >
> >The following packages have unmet dependencies:
> >>  python3-kivy : Depends: python3 (< 3.7) but 3.7.2-1 is installed
> >>
> >
> >and in the description of the package in the aptitude console:
> >
> >Depends: python3-gst-1.0, python3 (< 3.7), python3 (>= 3.5~), ...
> >>
> >
> >It's not a typo, unless other pages have similar typos (sometimes being
> >">>" - "greater than or greater than"?).
> >
> >Also, is the answer documented somewhere? I've researched
> >unproductively for several hours.
> >
>
> Hi!
>
> It's documented in Debian policy:
> https://www.debian.org/doc/debian-policy/ch-relationships.html
>
> >The relations allowed are <<, <=, =, >= and >> for strictly earlier,
> >earlier or equal, exactly equal, later or equal and strictly later,
> >respectively.
>
> >The relations < and > were previously allowed, but they were
> >confusingly defined to mean earlier/later or equal rather than
> >strictly earlier/later. dpkg still supports them with a warning, but
> >they are no longer allowed by Debian Policy.
>
>
>
> -- Andreas Rönnquist
> mailinglists@gusnan.se
> andreas@ronnquist.net
>


Thank you! That was driving me nuts!

So essentially, aptitude's "<" is out-dated, and should be "<<", to clearly
mean "earlier than" and not "earlier than or equal to"?

-- 
Kent West                    <")))><
Westing Peacefully - http://kentwest.blogspot.com

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#206128

On Sun, 10 Mar 2019 14:14:52 -0500,
Kent West<westk@acu.edu> wrote:

>Example: https://packages.debian.org/sid/python3-kivy
>
>-
>>
>> dep: python3 <https://packages.debian.org/sid/python3> (<< 3.7) dep:
>> python3 <https://packages.debian.org/sid/python3> (>= 3.5~)  
>
>
>The ">=" surely means "greater than or equal to", but what is "<<"?
>"less than or less than"?
>
>Even more interesting is that "aptitude install python3-kivy" only
>shows one "<" (which makes sense to me as "less than"):
>
>The following packages have unmet dependencies:
>>  python3-kivy : Depends: python3 (< 3.7) but 3.7.2-1 is installed
>>  
>
>and in the description of the package in the aptitude console:
>
>Depends: python3-gst-1.0, python3 (< 3.7), python3 (>= 3.5~), ...
>>  
>
>It's not a typo, unless other pages have similar typos (sometimes being
>">>" - "greater than or greater than"?).  
>
>Also, is the answer documented somewhere? I've researched
>unproductively for several hours.
>

Hi!

It's documented in Debian policy:
https://www.debian.org/doc/debian-policy/ch-relationships.html

>The relations allowed are <<, <=, =, >= and >> for strictly earlier,
>earlier or equal, exactly equal, later or equal and strictly later,
>respectively.

>The relations < and > were previously allowed, but they were
>confusingly defined to mean earlier/later or equal rather than
>strictly earlier/later. dpkg still supports them with a warning, but
>they are no longer allowed by Debian Policy.



-- Andreas Rönnquist
mailinglists@gusnan.se
andreas@ronnquist.net

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#206135

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Hi

On 10. 03. 19 20:14, Kent West wrote:
> The ">=" surely means "greater than or equal to", but what is "<<"?
> "less than or less than"?

"<<" means "strictly earlier (i.e. less than)". In other words, it
matches versions that sort earlier, but are not equal to the
right-hand-side. This is in contrast to "<=" that also matches versions
that are equal to the right-hand-side.

> Even more interesting is that "aptitude install python3-kivy" only shows
> one "<" (which makes sense to me as "less than"):

"<" is an obsolete version of "<=" that is no longer allowed in packages
that follow recent versions of Debian Policy.

> Also, is the answer documented somewhere? I've researched unproductively
> for several hours.

This is documented in the Debian Policy Manual:

https://www.debian.org/doc/debian-policy/ch-relationships.html#syntax-of-relationship-fields

See remark [2] on that page regarding "<" vs "<<".

Best regards
Tomaž

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