[opkg 0/3] Rework criteria for dependent package selection

Robert Marko robimarko at gmail.com
Thu Jan 19 08:10:56 PST 2023

On Mon, 17 Oct 2022 at 19:07, Eneas U de Queiroz <cotequeiroz at gmail.com> wrote:
> This fixes a problem when generating an image using the firmware
> building, to include libwolfsslcpu-crypto.  Before they are sent to the
> asu server, the firmware builder strips ABI version from the packages
> and sort they alphabetically.  That means libustream-wolfssl will be
> installed before libwolfsslcpu-crypto.
> Opkg will see that libustream-wolfssl depends on
> libwolfssl5.5.1.b24d5f87.  Since it matches the name of the regular
> libwolfssl package, it is chosen and installed.  When it comes
> libwolfsslcpu-crypto's turn, it will fail because of a clash with the
> regular package.
> If you were to run it in the cmdline with the full name of
> libwolfsslcpu-crypto5.5.1.b24d5f87, or list it before any dpeendents,
> then it would work as expected.  However, because the firmware selector
> sripts ABI version and changes the order of the packages, there's no way
> to build an image with both libustrem-wolfssl and libwolfsslcpu-crypto.
> The first two commits attempt to add some order to the way they are
> currently chosen, by prioritizing packages chosen "by hand" and by
> preferring packages listed in the command line arguments over new
> packages chosen automatically.
> The third commit adds matching the package without ABI suffix, and
> establishes a hierarchy among the criteria, prioritizing user choices
> (i.e. package names given in as command line arguments), then developer
> choices (chosen package names), and resort to alphabetical order as a
> last resort.
> When resolving dependencies, packages listed in the cli may not have the
> ABI version, and they should have a higher priority over anything picked
> automatically.
> Use powers of two when computing the score to avoid ties due to
> different criteria, and so that it reflects what was matched.  The
> resulting priorities after this change are:
> 1. base score is 0
> ---USER CHOICES (cmdline)---
> 2. packages "picked by hand" (local file given in the cli) have absolute
>    priority, ending the search regardless of score
> 3. package whose full name is in the cli: score += 4
> 4. package whose name stripped of ABI matches one in the cli: score += 2
> ---DEVELOPER CHOICE (pkg data)---
> 5. package whose full name matches the dependency name: score += 1
>    Note: the ABI is recorded in the dependency, so I'm not using the
>    stripped name here.
> 6. in case of a tie, the last package that was looked at is chosen
>    (equivalent to being first in alphabetical order)
> I tried not to change things so much--aside from restoring the "picked
> by hand" case, I just created tie-breakers.  However, I still have some
> questions about the necessity of some of this.  For example: if more
> than one dependency is listed in the cli, does it matter which package
> is chosen?  I imagine it would be equivalent of the picked-by-hand case,
> so it would be simpler and faster to end the search.  It could make a
> difference if one were to install clashing packages with
> --force-overwrite in the same invocation, but I can't see a scenario
> where this would be useful.
> This was tested with the Image Builder, and by running opkg from command
> line on Linksys E8450 (mediatek/mt7622, aarch64_cortex-a53).

I have just rediscovered this issue since ipq807x uses the libwolfsslcpu-crypto
as a target package by default, however, this is breaking image builder.

So, I wanted to bring some attention to this patchset that is fixing this issue
as I am sure we are gonna hit more of these in the future are well.

Tested-by: Robert Marko <robimarko at gmail.com> # ipq807x

> Signed-off-by: Eneas U de Queiroz <cotequeiroz at gmail.com>
> Eneas U de Queiroz (3):
>   libopkg: pkg_hash: restore picked by hand priority
>   libopkg: pkg_hash: bump score of packages in cli
>   libopkg: pkg_hash: consider names stripped of ABI
>  libopkg/pkg_hash.c | 35 +++++++++++++++++++++++++++++------
>  1 file changed, 29 insertions(+), 6 deletions(-)
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