Re: linux-2.6 install errors due to incompatible depmod files [was Re: Bug#518412: initramfs-tools: must support relative paths in modules.dep ]

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On Thursday 19 March 2009, Jon Masters wrote:
> Yes, it was a bad idea of
> mine (perhaps) to change the existing file format and I've learned
> something, but it should only have affected for example that 3.4
> release you're using.

Do you mean that earlier versions are not affected? Hasn't depmod 
generated full paths basically any version up to 3.6?

But even if it is only 3.4, that still makes it every Debian stable user 
(and unknown other distros) who runs the risk of ending up with an 
unbootable system for hard to trace reasons...
Potentially painful for example for NAS devices where the kernel and 
initrd get installed in flash, replacing the previous version.

As the kernel Makefile does run depmod during a build, I don't think it's 
strange to assume users rely on that modules.dep being valid, even for 
older versions of modprobe.

What exactly are the resons behind the change in file format that're so 
strong that depmod cannot continue to generate the old format for the 
next 5 years or so as a transition period, until the risk is much lower 
that users run into problems because their current version of modprobe 
does not understand the new format? Are they really worth the potential 
consequences?
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