bug#64409: libusb shared object file paths

bug#64409: libusb shared object file paths

[Reed Meyerson]

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Hello,

I have been trying to get the teensy-loader-cli package working on my
machine and I am running into shared object file related errors.

explanation of bug:

running "teensy_loader_cli" (from the "teensy-loader-cli" package) gives
the following error:

teensy_loader_cli: error while loading libusb-1.0.so.0 from
libusb-0.1.so.4: libusb-1.0.so.0: cannot open shared object file: No such
file or directory

How to reproduce the bug:

$ guix shell --container teensy_loader_cli
[env]$ teensy_loader_cli

In the guix shell container, it does seem that there is no file for
libusb-1.0.so.0. In particular $GUIX_ENVIRONMENT/lib doesn't exist. I can
include the file in the environment by adding the libusb package:

$ guix shell --container teensy_loader_cli libusb coreutils
[env]$ ls $GUIX_ENVIRONMENT/lib
libusb-1.0.a   libusb-1.0.so libusb-1.0.so.0.3.0
libusb-1.0.la  libusb-1.0.so.0 pkgconfig

However,
[env]$ teensy_loader_cli
still gives the same error as before.

I can get it to run by manually setting the $LD_LIBRARY_PATH variable:

[env]$ LD_LIBRARY_PATH=$GUIX_ENVIRONMENT/lib teensy_loader_cli

Best,
Reed

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bug#64409: libusb shared object file paths

[Garek Dyszel via Bug reports for GNU Guix]

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Hash: SHA256

Hi Reed,

At 19:08 2023-07-01 UTC-0400, Reed Meyerson <address@hidden> wrote:
>I can get it to run by manually setting the $LD_LIBRARY_PATH variable:
> 
>[env]$ LD_LIBRARY_PATH=$GUIX_ENVIRONMENT/lib teensy_loader_cli

It seems I found a solution to your problem based on your clue here.
It's kind of a hack since I'm sure the maintainers are trying to get rid
of this, but... the solution is to use libusb-0.1 as a replacement for
the libusb-compat input.

Here's a package variant that does exactly that.

teensy-loader-cli-unbroken.scm:
- --8<---------------cut here---------------start------------->8---
(define-module (teensy-loader-cli-unbroken)
  #:use-module (guix packages)
  #:use-module (guix build utils)
  #:use-module (gnu packages libusb)
  #:use-module (gnu packages flashing-tools))

(define-public teensy-loader-cli-unbroken
  (package
    (inherit teensy-loader-cli)
    (name "teensy-loader-cli-unbroken")
    (inputs (list libusb-0.1))))

teensy-loader-cli-unbroken

- --8<---------------cut here---------------end--------------->8---

It works on my system and gives the usual output.

- --8<---------------cut here---------------start------------->8---
$ $(guix build -f ./teensy-loader-cli-unbroken.scm)/bin/teensy_loader_cli
Filename must be specified

Usage: teensy_loader_cli --mcu=<MCU> [-h] [-w] [-n] [-b] [-v] <file.hex>
        -h : Print this help message
        -w : Wait for device to appear
        -r : Use hard reboot if device not online
        -s : Use soft reboot if device not online (Teensy 3.x & 4.x)
        -n : No reboot after programming
        -b : Boot only, do not program
        -v : Verbose output

Use `teensy_loader_cli --list-mcus` to list supported MCUs.

For more information, please visit:
http://www.pjrc.com/teensy/loader_cli.html
- --8<---------------cut here---------------end--------------->8---

Note that I didn't try to flash anything with it yet. I'm working on
getting the udev rule to install with teensy-loader-cli, but I most
likely won't have that done anytime soon (or at all, if I lose
interest!).

I've been fighting with this sporadically over the last year, and this
was what I needed to get it working. Thanks for the hint!

Garek
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