ignore PYTHONPATH; fix error message when repo not found (#32)

Fix noisy crashes when invalid inputs were entered:

- an infrequently triggered error when `uenv start` is run without a default repo had an incorrectly formatted error message.
    - fix and made consistent with the equivalent error message for `uenv image` commands.
- if PYTHONPATH was set, incompatible python modules were being picked up
    - launch the commands with `env -u PYTHONPATH -u VIRTUAL_ENV`

VERSION

@@ -1 +1 @@
-4.1.1-dev
+4.1.1

activate

@@ -1,8 +1,8 @@
 # only run if bash or zsh
 [ -n "${BASH_VERSION:-}" ] || return 0
 
-export UENV_CMD=@@impl@@
-export UENV_IMG_CMD=@@image_impl@@
+export UENV_CMD='env -u PYTHONPATH -u VIRTUAL_ENV @@impl@@'
+export UENV_IMG_CMD='env -u PYTHONPATH -u VIRTUAL_ENV @@image_impl@@'
 export UENV_VERSION=@@version@@
 export UENV_PREFIX=@@prefix@@
 

test/commands.sh

@@ -10,8 +10,8 @@ echo ==================== image pull
 uenv image pull --help
 echo ==================== image ls
 uenv image ls --help
-echo ==================== image create
-uenv image create --help
+echo ==================== image repo
+uenv image repo --help
 echo ==================== image deploy
 uenv image deploy --help
 echo ==================== run

uenv-image

@@ -364,8 +364,9 @@ def safe_repo_open(path: str) -> datastore.FileSystemRepo:
         terminal.error(f"""The local repository {path} does not exist.
 If this is your first time using uenv, a repo in the default location can be created with this command:
   {colorize(f"uenv image repo", "white")}
-If you want to create a repo in a custom location, provide the path as follows:
-  {colorize(f"uenv image repo {repo_path}", "white")}
+If you want to create a repo in a custom location , provide the path as follows:
+  {colorize("uenv image repo <repo_path>", "white")}
+where {colorize("<repo_path>", "white")} is the desired location.
 """)
     except datastore.RepoDBError as err:
         terminal.error(f"""The local repository {path} had a database error.

uenv-impl

@@ -641,11 +641,13 @@ def parse_image_descriptions(mnt_list, repo, uarch):
             try:
                 fscache = datastore.FileSystemRepo(repo_path)
             except datastore.RepoNotFoundError as err:
-                terminal.error(f"""The local repository {path} does not exist.
-If this is your first time using uenv, a repo in the default location can be created with this command:
+                terminal.error(f"""The local repository {repo_path} does not exist.
+If this is your first time using uenv, a repo in the default location can be
+created with this command:
   {colorize(f"uenv image repo", "white")}
-If you want to create a repo in a custom location, provide the path as follows:
-  {colorize(f"uenv image repo {repo_path}", "white")}
+If you want to create a repo in a custom location , provide the path as follows:
+  {colorize("uenv image repo <repo_path>", "white")}
+where {colorize("<repo_path>", "white")} is the desired location.
 """, abort=False)
                 return []
             except datastore.RepoDBError as err: