linux-ext4 - e2image reading from pipe

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Message-ID: <CALBH9DC=9t5F=EtdM134-ysOS10zNyYEgXRxcL-QS+aE=FGykg@mail.gmail.com>
Date: Wed, 27 Aug 2025 12:48:17 -0400
From: David Gilman <davidgilman1@...il.com>
To: linux-ext4@...r.kernel.org
Subject: e2image reading from pipe

The e2image manpage describes when and how you can write the e2image
output to stdout with -. This doesn't work in reverse: if you try to
pass - as the source device e2image doesn't do the standard -- trick
to get it to treat the rest of the arguments as literals instead of
additional flags.

I'm not familiar with the implementation of e2image, maybe you need a
seekable input to do your work. In that case could you document this
in the manpage? I see comments about the -r mode and using pipes as
output but nothing about pipes as input. But if it is possible to
source the input from a pipe could you please consider adding support
for it to e2image?

-- 
David Gilman
:DG<