When `gem exec foo` is run, and "foo" is a gem that has multiple
executables, none of them named "foo", raise an error explaining the
situation and telling user to be more specific.
Currently the first command in the executables array is run, but this
may come as surprising sometimes, so better raise an error.
acda5d8f6e
The $0 value is used in many CLI libraries to determine the name of the
application, when displaying help and error messages.
Without setting this value, it defaults to `gem` which can be confusing.
Before:
```
$ gem exec kamal help
Commands:
gem accessory # Manage accessories (db/redis/search)
gem app # Manage application
gem audit # Show audit log from servers
gem build # Build application image
gem config # Show combined config (including secrets!)
gem deploy # Deploy app to servers
gem details # Show details about all containers
gem docs [SECTION] # Show Kamal configuration documentation
gem help [COMMAND] # Describe available commands or one specific command
gem init # Create config stub in config/deploy.yml and secrets stub in .kamal
gem lock # Manage the deploy lock
gem proxy # Manage kamal-proxy
gem prune # Prune old application images and containers
gem redeploy # Deploy app to servers without bootstrapping servers, starting kamal-proxy, pruning, and registry login
gem registry # Login and -out of the image registry
gem remove # Remove kamal-proxy, app, accessories, and registry session from servers
gem rollback [VERSION] # Rollback app to VERSION
gem secrets # Helpers for extracting secrets
gem server # Bootstrap servers with curl and Docker
gem setup # Setup all accessories, push the env, and deploy app to servers
gem upgrade # Upgrade from Kamal 1.x to 2.0
gem version # Show Kamal version
```
After:
```
$ gem exec kamal help
Commands:
kamal accessory # Manage accessories (db/redis/search)
kamal app # Manage application
kamal audit # Show audit log from servers
kamal build # Build application image
kamal config # Show combined config (including secrets!)
kamal deploy # Deploy app to servers
kamal details # Show details about all containers
kamal docs [SECTION] # Show Kamal configuration documentation
kamal help [COMMAND] # Describe available commands or one specific command
kamal init # Create config stub in config/deploy.yml and secrets stub in .kamal
kamal lock # Manage the deploy lock
kamal proxy # Manage kamal-proxy
kamal prune # Prune old application images and containers
kamal redeploy # Deploy app to servers without bootstrapping servers, starting kamal-proxy, pruning, and registry login
kamal registry # Login and -out of the image registry
kamal remove # Remove kamal-proxy, app, accessories, and registry session from servers
kamal rollback [VERSION] # Rollback app to VERSION
kamal secrets # Helpers for extracting secrets
kamal server # Bootstrap servers with curl and Docker
kamal setup # Setup all accessories, push the env, and deploy app to servers
kamal upgrade # Upgrade from Kamal 1.x to 2.0
kamal version # Show Kamal version
```
4fd060b96d
