Previously, paths like /nix/store/hash-file.nix:123 were incorrectly
treated as pure store paths and wrapped in {"outPath": ...}, breaking
the cache. This fix:
- Adds helper functions to properly detect and handle store references
- Distinguishes between pure store paths and paths with metadata (line numbers)
- Supports multiple store references in a single string
- Handles custom NIX_STORE_DIR correctly
- Ensures existence checks work for all store references
Also fixes test_cache_gc to delete NIX_REMOTE for proper local store testing.
When running for example `clan networks list` we now get a reasonable
error message, instead of:
```
Traceback (most recent call last):
File "/nix/store/8ygq8bfxqydk2917mmg32wy9wb0qzzzd-clan-cli/bin/.clan-wrapped", line 9, in <module>
sys.exit(main())
~~~~^^
File "/nix/store/8ygq8bfxqydk2917mmg32wy9wb0qzzzd-clan-cli/lib/python3.13/site-packages/clan_cli/cli.py", line 516, in main
args.func(args)
~~~~~~~~~^^^^^^
File "/nix/store/8ygq8bfxqydk2917mmg32wy9wb0qzzzd-clan-cli/lib/python3.13/site-packages/clan_cli/network/list.py", line 12, in list_command
networks = networks_from_flake(flake)
File "/nix/store/8ygq8bfxqydk2917mmg32wy9wb0qzzzd-clan-cli/lib/python3.13/site-packages/clan_lib/network/network.py", line 106, in networks_from_flake
networks_ = flake.select("clan.exports.instances.*.networking")
^^^^^^^^^^^^
AttributeError: 'NoneType' object has no attribute 'select'
```
This adds a (for now hidden) clan network command that exposes list,
ping, overview subcommands to get informations about configured
networks.
ClanServices can now use the exports to define network specific
information.
This is not the complete feature yet, as we are lacking more tests and
documentation, but merging this now makes it easier to iterate.
Fix the ssh logging level.
Currently the ssh commands is printed every time on an ssh connection.
While seeing the command is useful, we should print this when running
clan with the `--debug` flag.
Add a `require_flake` function that checks, if no argument is passed, if
we are in a clan directory.
If not will throw a helpful error.
Before `clan show`:
```
Traceback (most recent call last):
File "/nix/store/8kb3l3yvz6svygnxdlrw5lmd3h3chc8a-clan-cli/bin/.clan-wrapped", line 9, in <module>
sys.exit(main())
~~~~^^
File "/nix/store/8kb3l3yvz6svygnxdlrw5lmd3h3chc8a-clan-cli/lib/python3.13/site-packages/clan_cli/cli.py", line 493, in main
args.func(args)
~~~~~~~~~^^^^^^
File "/nix/store/8kb3l3yvz6svygnxdlrw5lmd3h3chc8a-clan-cli/lib/python3.13/site-packages/clan_cli/clan/show.py", line 12, in show_command
meta = get_clan_details(flake)
File "/nix/store/8kb3l3yvz6svygnxdlrw5lmd3h3chc8a-clan-cli/lib/python3.13/site-packages/clan_lib/clan/get.py", line 22, in get_clan_details
if flake.is_local and not flake.path.exists():
^^^^^^^^^^^^^^
AttributeError: 'NoneType' object has no attribute 'is_local'
```
with `require_flake`:
```
No clan flake found in the current directory or its parents - Use the --flake flag to specify a clan flake path or URL
```
