Re: Updating dpkg-cross: file moving question
"Nikita V. Youshchenko" <yoush@cs.msu.su> writes:
> Hello.
>
> I'm going to update dpkg-cross package, to follow post-sarge changes in
> dpkg and company.
>
> Dpkg-cross is a tool to create cross-compile environment, useful to
> cross-compile debian packages and other software.
> One of dpkg-cross's functions is to process a native library or libdev
> package for some arch, and turn it into arch-all packages that install
> libraries info /usr/$DEB_TARGET_GNU_ARCH)/lib/, and headers
> info /usr/$(DEB_TARGET_GNU_ARCH)/include/. E.g. arm cross-compile
> environment was created under /usr/arm-linux/. This was consistent with
> cross-binutils and cross-gcc packages file placement.
That isn't where the multiarch proposals for Debian and FHS place
files and I think it is best if you follow their lead. Use
/usr/lib/$(DEB_HOST_GNU_CPU)-$(DEB_HOST_ARCH_OS)/
/usr/include/$(DEB_HOST_GNU_CPU)-$(DEB_HOST_ARCH_OS)/
> In newer dpkg tools, target names changed, e.g. arm-linux turned into
> arm-linux-gnu. So, to keep system consistent, dpkg-cross should now place
> things under /usr/arm-linux/gnu/.
>
> The question is - how to process existing cross-compile environment,
> created by earlier versions of dpkg-cross.
>
> I am thinking to make the following trick. In postinst of new dpkg-cross,
> it will check for /usr/arm-linux, /usr/powerpc-linux/, and other places
> where packages created by earlier versions could place files. If any of
> such directories is found:
> - a directory with the new name will be created if not exists yet,
> - complete file hierarchy from the old directory will be copied to the new
> directory,
> - old directory will be replaces with a sympink to the new one.
>
> Looks that this procedure is more or less safe. E.g. removals of packages
> which files have been moved in this way, would remove correct files.
The target directory would not be removed.
> Is it OK to go this way? Maybe, something better could be suggested?
>
> This is still not perfect: for example, it is never safe to remove created
> symlinks; also cross-compile environment will become broken if -arch-cross
> packages created with old and new dpkg-cross are mixed and dpkg-cross
> itself is either old or not installed. However, isn't it better than doing
> nothing (in which case any mixing of -arch-cross packages created by old
> and new dpkg-cross will be broken)?
>
> Nikita
MfG
Goswin
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