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Doc: Add section about indirect data types

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Paul Schaub 2022-11-15 21:27:22 +01:00
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docs/source/pgpainless-cli/usage.md
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@ -84,8 +84,24 @@ Exit Codes:
61 Input file does not exist
67 Cannot unlock password protected secret key
69 Unsupported subcommand
71 Unsupported special prefix (e.g. "@env/@fd") of indirect parameter
71 Unsupported special prefix (e.g. "@ENV/@FD") of indirect parameter
73 Ambiguous input (a filename matching the designator already exists)
79 Key is not signing capable
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```
```
## Indirect Data Types
Some commands take options whose arguments are indirect data types. Those are arguments which are not used directly,
but instead they point to a place where the argument value can be sourced from, such as a file, an environment variable
or a file descriptor.
It is important to keep in mind, that options like `--with-password` or `--with-key-password` are examples for such
indirect data types. If you want to unlock a key whose password is `sw0rdf1sh`, you *cannot* provide the password
like `--with-key-password sw0rdf1sh`, but instead you have to either write out the password into a file and provide
the file's path (e.g. `--with-key-password /path/to/file`), store the password in an environment variable and pass that
(e.g. `--with-key-password @ENV:myvar`), or provide a numbered file descriptor from which the password can be read
(e.g. `--with-key-password @FD:4`).
Note, that environment variables and file descriptors can only be used to pass input data to the program.
For output parameters (e.g. `--verifications-out`) only file paths are allowed.