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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 61 Input file does not exist
67 Cannot unlock password protected secret key 67 Cannot unlock password protected secret key
69 Unsupported subcommand 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) 73 Ambiguous input (a filename matching the designator already exists)
79 Key is not signing capable 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.