xtool/cppkg:install in linux

[luoliwoshang]

1. conan not in apt-get ' resource,so we could not use apt-get to install conan,and use pip install will got follow error,and the suggestion in the error message tips to use pipx.

> python3 -m pip install conan
error: externally-managed-environment

× This environment is externally managed
╰─> To install Python packages system-wide, try apt install
    python3-xyz, where xyz is the package you are trying to
    install.

    If you wish to install a non-Debian-packaged Python package,
    create a virtual environment using python3 -m venv path/to/venv.
    Then use path/to/venv/bin/python and path/to/venv/bin/pip. Make
    sure you have python3-full installed.

    If you wish to install a non-Debian packaged Python application,
    it may be easiest to use pipx install xyz, which will manage a
    virtual environment for you. Make sure you have pipx installed.

    See /usr/share/doc/python3.12/README.venv for more information.

note: If you believe this is a mistake, please contact your Python installation or OS distribution provider. You can override this, at the risk of breaking your Python installation or OS, by passing --break-system-packages.
hint: See PEP 668 for the detailed specification.

---

user need install pipx,so when user not install pipx or brew notify error message with app manager.

root@259c7fd049f2:~/llgo/cmd/llgo# llgo cppkg install kspalaiologos/bzip3@1.5.1
From https://github.com/goplus/cppkg
 * branch              main       -> FETCH_HEAD
Already up to date.
panic: app managers not found: brew, pipx: executable file not found in $PATH

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 87.34%. Comparing base (98bd05b) to head (d3e228c).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1104   +/-   ##
=======================================
  Coverage   87.34%   87.34%           
=======================================
  Files          29       29           
  Lines        7225     7225           
=======================================
  Hits         6311     6311           
  Misses        849      849           
  Partials       65       65           

☔ View full report in Codecov by Sentry.
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[xushiwei]

should conan detect run every time?

[luoliwoshang]

Since it's only necessary to detect the profile once after installing Conan, should we skip conan profile detect if a profile already exists (i.e., if conan profile show executes successfully)

func conanDetect(app string, out io.Writer) (err error) {
	profileCmd := exec.Command(app, "profile", "show")
        // ....
	profileErr := profileCmd.Run()
	if profileErr == nil {
		return
	}
        // ...

or would you rather recommend letting the subsequent conan install step fail and prompt the user to run profile detect

[xushiwei]

normally it's an unreachable path. so don't need have a kindly message.

[luoliwoshang]

On Linux, pipx might not be a very commonly used installation method, unlike brew or apt-get. So,I think a prompt like the one below could help reduce confusion during usage:

root@259c7fd049f2:~/llgo/cmd/llgo# llgo cppkg install kspalaiologos/bzip3@1.5.1  
From https://github.com/goplus/cppkg  
 * branch              main       -> FETCH_HEAD  
Already up to date.  
panic: app managers not found: brew, pipx: executable file not found in $PATH