Re: [PATCH v2] send-email: try to get fqdn by running hostname --fqdn on Linux and macOS

> On 12 May 2025, at 1:16 PM, Julian Swagemakers <julian@swagemakers.org> wrote:
> 
> On Sat May 10, 2025 at 9:37 AM CEST, Aditya Garg wrote:
>> `hostname` is a popular command available on both Linux and macOS. As
>> per the man-page[1], `hostname --fqdn` command returns the fully
>> qualified domain name (FQDN) of the system.
> 
> There are multiple implementations of the hostname command, and they
> don't all support `--fqdn`. For example this will not work on Alpine
> Linux as well as macOS.
> 
> macOS:
> 
>    $ hostname --fqdn
>    hostname: illegal option -- -
>    usage: hostname [-f] [-s | -d] [name-of-host]
> 
> Alpine:
> 
>    $ hostname --fqdn
>    hostname: unrecognized option: fqdn
>    BusyBox v1.37.0 (2025-01-17 18:12:01 UTC) multi-call binary.
> 
>    Usage: hostname [-sidf] [HOSTNAME | -F FILE]
> 
>    Show or set hostname or DNS domain name
> 
>        -s    Short
>        -i    Addresses for the hostname
>        -d    DNS domain name
>        -f    Fully qualified domain name
>        -F FILE    Use FILE's content as hostname
> 
> All seem to support `-f` though, maybe that would be the better option.