conan install unbuilt dependencies encountering series of problems-CodePudding

Scenario:

I want to install Qt using conan install. I simply list qt/6.3.0 in [requires] section in my conanfile.txt.

Since Qt isn't a pre-built lib, so I use this command after a few failed attempts.

sudo conan install .. --build=missing

I use sudo because it's necessary to build those dependencies, or it will fail because some permissions are denied during the installation.

Problem:

Using sudo causes dependencies being installed in /root/.conan folder. Then all built procedures will also need sudo because you need to access those dependencies. It's very inconvenient.

Question:

So, either run the command in user mode, or set the dependency install folder to <user>/.conan under super-user mode and open the files' permission for <user>. But I don't know how.

Thanks in advance!

CodePudding user response：

You should never use sudo to call conan command.

The sudo operation seems necessary for the system package manager. Checking the available configurations with conan config list we see:

$ conan config list
...
tools.system.package_manager:mode: Mode for package_manager tools: 'check' or 'install'
tools.system.package_manager:sudo: Use 'sudo' when invoking the package manager tools in Linux (False by default)
tools.system.package_manager:sudo_askpass: Use the '-A' argument if using sudo in Linux to invoke the system package manager (False by default)
tools.system.package_manager:tool: Default package manager tool:

You can control and request usage of sudo just for the system package manager with tools.system.package_manager:sudo

CodePudding user response：

Ok, solved.

Just for record:

First, set conanfile.txt. Then, run

mkdir build
cd build
conan install .. --build=missing

this command will build & install Qt. But after installation, the procedure fails because of Permission Error.

conanfile.txt: ERROR: Generator txt(file:conanbuildinfo.txt) failed. 
[ERROR 13] Permission denied: '<my_project_path>/build/conanbuildinfo.txt'

Then delete whole build folder and re-build with

conan install ..

Because qt has been installed, so you don't need to build it. Then everything is Ok.

I think there may be some weird bugs in conan resulting above behavior. Maybe when build Qt lib, some file's permission mode has been changed. I don't know.