fix(proxies): define environment variable for proxy use for git clone (…

…#584)

When a proxy is needed for git clone, `dulwich` and high level interface
`porcelain` only use environment variable for proxy definition :
`HTTP_PROXY` / `HTTPS_PROXY`

In this PR we are :
- defining a wrapper for environment variable definition and backup
- use wrapper for all function using porcelain for git command

qgis_deployment_toolbelt/profiles/profiles_handler_base.py

@@ -28,6 +28,7 @@
 from giturlparse import validate as git_validate
 
 # project
+from qgis_deployment_toolbelt.utils import proxies
 from qgis_deployment_toolbelt.utils.check_path import check_folder_is_empty
 
 # #############################################################################
@@ -223,6 +224,7 @@ def _is_url_git_repository(
             )
             return False
 
+    @proxies.os_env_proxy
     def get_active_branch_from_local_repository(
         self, local_git_repository_path: Path | None = None
     ) -> str:
@@ -302,6 +304,7 @@ def is_branch_existing_in_repository(
             )
         ]
 
+    @proxies.os_env_proxy
     def list_remote_branches(
         self, source_repository_path_or_url: Path | str | None = None
     ) -> tuple[str]:
@@ -351,6 +354,7 @@ def list_remote_branches(
         else:
             return ("",)
 
+    @proxies.os_env_proxy
     def download(self, destination_local_path: Path) -> Repo:
         """Generic wrapper around the specific logic of this handler.
 
@@ -471,6 +475,7 @@ def clone_or_pull(self, to_local_destination_path: Path, attempt: int = 1) -> Re
             )
             return None
 
+    @proxies.os_env_proxy
     def _clone(self, local_path: Path) -> Repo:
         """Clone the remote repository to local path.
 
@@ -526,6 +531,7 @@ def _clone(self, local_path: Path) -> Repo:
         )
         return repo_obj
 
+    @proxies.os_env_proxy
     def _fetch(self, local_path: Path) -> Repo:
         """Fetch the remote repository from the existing local repository.
 
@@ -564,6 +570,7 @@ def _fetch(self, local_path: Path) -> Repo:
 
         return destination_local_repository
 
+    @proxies.os_env_proxy
     def _pull(self, local_path: Path) -> Repo:
         """Pull the remote repository from the existing local repository.
 

qgis_deployment_toolbelt/utils/proxies.py

@@ -12,6 +12,7 @@
 
 # Standard library
 import logging
+import os
 from functools import lru_cache
 from os import environ
 from urllib.request import getproxies
@@ -159,6 +160,46 @@ def get_proxy_settings_from_pac_file(
     return proxy_settings
 
 
+def os_env_proxy(func):
+    def wrapper(*args, **kwargs):
+        """Decorator wrapper to define environment variable for proxy use.
+
+        If a proxy settings is available for https or http we:
+        - backup current environment value
+        - define environment value with proxy settings
+        - run function
+        - restore environment value if available
+
+
+        Returns:
+            _type_: function result
+        """
+        # Get proxy settings
+        proxy_settings = get_proxy_settings()
+
+        # Update environment variable and keep current value
+        prev_http_proxy = None
+        if "http" in proxy_settings:
+            prev_http_proxy = environ.get("HTTP_PROXY")
+            os.environ["HTTP_PROXY"] = proxy_settings["http"]
+        prev_https_proxy = None
+        if "https" in proxy_settings:
+            prev_https_proxy = environ.get("HTTPS_PROXY")
+            os.environ["HTTPS_PROXY"] = proxy_settings["https"]
+
+        # Run function
+        result = func(*args, **kwargs)
+
+        # Restore environment variable if available
+        if prev_http_proxy:
+            os.environ["HTTP_PROXY"] = prev_http_proxy
+        if prev_https_proxy:
+            os.environ["HTTPS_PROXY"] = prev_https_proxy
+        return result
+
+    return wrapper
+
+
 # #############################################################################
 # ##### Stand alone program ########
 # ##################################