[feature] make system_requirements error logger more informative

[AndreyMlashkin]

currently, error log looks like:

xorg/system: ERROR: while executing system_requirements(): Can't update because tools.system.package_manager:mode is 'check'.Please update packages manually or set 'tools.system.package_manager:mode' to 'install' in the [conf] section of the profile, or in the command line using '-c tools.system.package_manager:mode=install'
ERROR: Error in system requirements

If should contain a list, which packages are missing.

• I've read the CONTRIBUTING guide.

[memsharded]

Can you please report which tool are you using inside system_requirements()? Because there are 2, the legacy and the new one in from conan.tools.

[AndreyMlashkin]

I am not sure, what do you exactly mean.
I am installing official xorg/system
https://github.com/conan-io/conan-center-index/blob/master/recipes/xorg/all/conanfile.py

[memsharded]

Good, that is using the new tooling in from conan.tools.system.package_manager import Apt, Dnf, PacMan, Pkg, Yum, Zypper

[czoido]

Hi @AndreyMlashkin,
Thanks for the feedback. I can open a PR to improve the message. What information do you miss in the message? Maybe it can also be a problem of lack of visibility in the Conan documentation? The new package_manager tools are documented here.

[AndreyMlashkin]

I would like to see, which packages are missing.
It would be perfect to have the full list of missing dependencies

[czoido]

I would like to see, which packages are missing. It would be perfect to have the full list of missing dependencies

I think the problem is that the recipe in conan-center-index is forcing an update for the packages but that will make that something like apt-get update is executed and that is not allowed if the configuration package_manager:mode is different from install. Let me mark this as look into so I can discuss the implications of this with the team.

[czoido]

@AndreyMlashkin

Did you try to set the conf: tools.system.package_manager:mode=install?

You can do that in the command line like:

conan create ... -c tools.system.package_manager:mode=install

Or in the [conf] section of your Conan profile.

[GavinNL]

My CI is failing with the same error

xorg/system: ERROR: while executing system_requirements(): Can't update because tools.system.package_manager:mode is 'check'.Please update packages manually or set 'tools.system.package_manager:mode' to 'install' in the [conf] section of the profile, or in the command line using '-c tools.system.package_manager:mode=install'

My CI has sudo, but not sure what to do about this. I tried adding the following but it didn't work

conan install .. -c tools.system.package_manager:mode=install

Is there anything else I'm supposed to add?

[czoido]

Hi @GavinNL,
If you also add -c tools.system.package_manager:sudo=True the package manager will be invoked with sudo:

conan install .. -c tools.system.package_manager:mode=install -c tools.system.package_manager:sudo=True

Hope this helps.

[GavinNL]

Ahh okay. looks like that worked. Thanks!

Is there a way to get the list of system packages required by the conanfile? something like:

conan list-required-system-packages ../conanfile.txt

[AndreyMlashkin]

@AndreyMlashkin

Did you try to set the conf: tools.system.package_manager:mode=install?

You can do that in the command line like:

conan create ... -c tools.system.package_manager:mode=install

Or in the [conf] section of your Conan profile.

I don't need to install the dependencies, I only want to print missing ones. The same as a call
conan install my_dependency/1.1.1@ would do if you don't specify --build missing

[czoido]

Ahh okay. looks like that worked. Thanks!

Is there a way to get the list of system packages required by the conanfile? something like:

conan list-required-system-packages ../conanfile.txt

@GavinNL we don't have a dedicated command for that but you could iterate the dependencies in the conanfile's generate() method and get the list of system libs. Something like:

def generate(self):
    system_libs = []
    for dep in self.dependencies.values():
        if dep.cpp_info.has_components:
            sorted_components = dep.cpp_info.get_sorted_components().items()
            for comp_name, comp_cpp_info in sorted_components:
                system_libs.extend(comp_cpp_info.system_libs)
        else:
            system_libs.extend(dep.cpp_info.system_libs)

    print(system_libs)

In Conan 2.0, there's the possibility to add your own custom commands, so you could make your own command for that. You can read about that in the Conan 2.0 documentation.

[czoido]

@AndreyMlashkin
We have merged #11712 and will be released in 1.51, from that version you will see what packages are missing being in mode=check, so this should solve your issue.