Re: [PATCH] dtdiff: change to POSIX shell

[Kyle Evans <kevans-h+KGxgPPiopAfugRpC6u6w@public.gmane.org>]

On Thu, Feb 1, 2018 at 10:14 PM, Mike Frysinger <vapier-aBrp7R+bbdUdnm+yROfE0A@public.gmane.org> wrote:
> On 10 Jan 2018 16:57, David Gibson wrote:
>> On Wed, Jan 10, 2018 at 12:47:56AM -0500, Mike Frysinger wrote:
>> > This changes from the bash-specific process substitution feature to
>> > reading with pipes.  It relies on /dev/fd or /proc/self/fd existing.
>> >
>> > URL: https://crbug.com/756559
>> > Signed-off-by: Mike Frysinger <vapier-F7+t8E8rja9g9hUCZPvPmw@public.gmane.org>
>>
>> Yeah, sorry, replacing a dependency on a complex but widely available
>> shell with a much more cryptic dependency on a Linux specific feature
>> does not seem like a win to me.
>
> bash's <(...) only works when the host supports either /dev/fd or /proc/self/fd,
> so i don't think this is less portable.  /dev/fd also isn't Linux-specific.
> -mike

For what it's worth, this isn't completely true. Bash can also use
FIFOs for process substitution [1]. FreeBSD does not use fdescfs by
default, but it can be mounted, and using fdescfs for process
substitution is provided as an optional feature in shells/bash. It
would be nice to not grow a dependency on fdescfs for dtc. =)

[1] https://www.gnu.org/software/bash/manual/html_node/Process-Substitution.html