- REQUIRED ARGUMENTS
- EXIT STATUS
- BUGS AND LIMITATIONS
- LICENSE AND COPYRIGHT
runcrypt - Encrypt and mail output from command in arguments
runcrypt [--sign[=(1|0)] [--encrypt[=(1|0)] [--keyid KEYID] [--passfile PATH] [--mailto RECIPIENT] [--name NAME] COMMAND [ARG1 ...]
This program applies Mail::Run::Crypt to run a command and send any output or error content to the specified address. More information is available in the documentation for that module.
The arguments beyond the options are used as the command name to run:
runcrypt rsync -a /mnt/a remote:mnt/b
The recipient address for the encryption portion of the email. This defaults to the value of the environment variable
RUNCRYPT_MAILTOif that is set, or
MAILTOfailing that, to make it suitable for use in a crontab(5) file.
Whether to encrypt the output to the recipient. This defaults to 1.
Whether to sign the output. This defaults to 0. An ID and passphrase file will need to be provided for signing to work.
It is strongly recommended that a dedicated key and passphrase be used for signatures if this is needed. You should carefully consider the consequences of a compromised key.
The GnuPG key ID that should be used to sign messages. This is required for signing, and has no effect if
--signis not given. It can be any means of identifying the key acceptable to GnuPG; the key's 8-byte ("long") hexadecimal ID prefixed with
0xis probably the best way.
This defaults to the value of the environment variable
Path to a filename that should be read to get the key passphrase for signing. This defaults to the value of the environment variable
RUNCRYPT_PASSFILE. This is required for signing, and has no effect if
--signis not given.
One trailing newline will be removed from the file contents with
It is strongly recommended, but not enforced by this program, that this file have strict permissions (not group or world-readable).
By design, there is no way to specify the passphrase directly as an argument. This has too many negative security implications.
The name for this instance of the module, which will be used as the first word of the subject line of any email messages it sends. This defaults to
runcrypt, which is probably good enough in most cases.
- failed stdout usage write
Usage information could not be written to the standard output stream.
- failed stderr usage write
Usage information could not be written to the standard error stream.
- passfile %s open failed: %s
The specified passphrase file could not be opened. This is a fatal error.
- passfile %s close failed: %s
The specified passphrase file could not be closed. This is not a fatal error.
You will need to have a functioning GnuPG public key setup for this to work, including stored keys or a key retrieval system for your recipients. You will also need a secret key if you want to sign the messages.
You should definitely not use your personal key for this; generate one specifically for mail signing and encryption instead.
I wrote a tutorial on GnuPG key setup, including agent configuration, as part of this series:
This module uses Mail::GnuPG and other GPG-specific code, so it won't work with any other OpenPGP implementations.
Copyright (C) 2017 Tom Ryder
This program is free software; you can redistribute it and/or modify it under the terms of the Artistic License (2.0). You may obtain a copy of the full license at:
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