Define further error handlers

[probonopd]

Define further error handlers, e.g., for

• Linuxulator has too old a kernel version set
• A required dependency library is too old
• A required dependency Python module is not installed
• A required dependency library is not installed; right now we tell the user to sudo pkg install ... but we should actually offer to do it
• A required Linux dependency library is not installed
• (...)

---

Implemented so far:

[probonopd]

The launch command is supposed to give users helpful information in case an application cannot be launched. (in a future version, we may want to not only give advice but also offer to do it.)

Exmaple:
https://www.cinelerra-gg.org/freebsd-package/

It would be neat if we could offer a way for the user to find out which FreeBSD package to install.

https://www.freshports.org/search.php?stype=pkg-plist&method=match&query=libIlmImf&num=1&orderby=category&orderbyupdown=asc&search=Search&format=plaintext&branch=head

tells us: graphics/openexr! (Note that we need to use libIlmImf minus any version numbers or else we don't get any search result.)

...almost.

% find /usr/local/lib/ | grep libIlmImf 
/usr/local/lib/libIlmImfUtil-2_5.so.25
/usr/local/lib/libIlmImf-2_5.so
/usr/local/lib/libIlmImf-2_5.so.25

Turns out that sudo pkg install graphics/openexr installs 25 whereas we need 24.

So we really need a way to search for the full file name, not "minus any version numbers".
Ideally across all still-available package branches (maybe we would find 24 in some earlier one?).

Is there a way to do this @dlangille?

(Also, is it a bug that this query returns HTML rather than plaintext?)

[probonopd]

We might even want to run dd proactively to find all missing libraries at once:

% ldd ~/Desktop/Cinelerra\ GG.app/Resources/cin | grep not
        libIlmImf-2_3.so.24 => not found (0)
        libIlmThread-2_3.so.24 => not found (0)
        libIex-2_3.so.24 => not found (0)
        libaom.so.0 => not found (0)
        libdav1d.so.3 => not found (0)
        libx264.so.157 => not found (0)
        libx265.so.176 => not found (0)

[grahamperrin]

#1 (comment)

Also, for example:

% pkg provides libilmimf
Name    : openexr-2.5.5
Desc    : High dynamic-range (HDR) image file format
Repo    : FreeBSD
Filename: usr/local/lib/libIlmImfUtil.so
        usr/local/lib/libIlmImfUtil-2_5.so.25.0.4
        usr/local/lib/libIlmImfUtil-2_5.so.25
        usr/local/lib/libIlmImfUtil-2_5.so
        usr/local/lib/libIlmImf.so
        usr/local/lib/libIlmImf-2_5.so.25.0.4
        usr/local/lib/libIlmImf-2_5.so.25
        usr/local/lib/libIlmImf-2_5.so

Name    : ampasCTL-1.5.2_11
Desc    : Color Transformation Language interpreter
Repo    : FreeBSD
Filename: usr/local/lib/libIlmImfCtl.so
% 

[probonopd]

pkg provides

Does this work with packages that are not installed as well?

[grahamperrin]

Yes; https://www.freshports.org/ports-mgmt/pkg-provides/

[probonopd]

Wow!

• https://www.freebsd.org/cgi/man.cgi?pkg-provides
• https://pkg-provides.osorio.me/

Sounds like what we need. (At least if it keeps track of release_0, release_1, release_2, quarterly, latest and so on packages for each major release of FreeBSD.)

Related: FreshPorts/freshports#219 (comment)