[Buildroot] [PATCH 1/1] openssh: replace individual ssh-keygen calls with a single call

Waldemar Brodkorb wbx at openadk.org
Mon Aug 4 09:17:56 UTC 2014

Thomas Petazzoni wrote,

> Dear Danomi Manchego,
> On Sun, 3 Aug 2014 09:25:13 -0400, Danomi Manchego wrote:
> > I think this issue is not limited to openssh - there's other things
> > that want to occasionally save stuff to /etc, /var, even /root (e.g.
> > gstreamer plugins cache).  I suppose that efforts could be made to try
> > to patch/configure these locations to all be in one place (/var ?),
> > but that still assumes a writable directory.  So, unless we direct all
> > attempts to save state to a tmpfs, I think it always come back to
> > being the user's responsibility.
> > 
> > So for now I'm content to keep openssh as it is, rather than hunt down
> > all the places that might try to write to etc (, var, $HOME, ...).
> Buildroot is normally supposed to support a read-only root filesystem,
> and there are already several things being done to make this possible:
>  * /etc/resolv.conf is a symbolic link to /tmp/resolv.conf
>  * Most of the /var/<foo> directories are symbolic links to /tmp.
>    Only /var/lib is not.
>  * /tmp is mounted as tmpfs, so that it's read/write even if the rootfs
>    is read only.

In OpenADK is use cfgfs - configuration filesystem. It maintains
a tmpfs based /etc and let the user commit any changes via a
commandline tool to a partition on a block/mtd device.

Only changes are compressed via LZO and written to the maximum
16 MB cfgfs partition.

It allows smooth updates without loosing device configuration data.

Any interest in porting it to buildroot?

best regards

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