Le 21 août 2013 08:04, "Raphael Hertzog" <hert...@debian.org> a écrit :
>
> Hi,
>
> On Tue, 20 Aug 2013, Bastien ROUCARIES wrote:
> > > A possible way to do this could be:
> > > * Move the directory away in preinst (<dir>.dpkg-backup), put in
place a symlink
> > > pointing to the renamed directory
> > ok this is easy
> > > * In postinst, move remaining files from the temporary directory to
> > > the directory pointed by the symlink (except if there's already a
new
> > > file at the expected location, in that case warn about the conflict
> > > and leave the file).
> >
> > How can I do this ? mv -n is not portable, and if I use find how to
> > handle symlink ?
>
> mymove() {
> local origin=$1
> local target=$2
> while read path; do
> # do the work for each file here
> done
> }
Not safe if a filename include a new line...
Find -print0
And replacing read by read -r -d $'\0' is safer but I do not know if it is
portable.
Or xargs but we need to fork for each file and we get the portability
problem of find print0.
What do you prefer ?
> find $origin | mymove $origin $target
>
> You can use compute the relative path names by stripping $origin from the
> stard and you can do whatever checks you want with "test".
>
> > Should I check if md5sum are the same in case of conflicts and
> > override in this case ?
>
> I would not override but it's interesting to compare the files
> yes. That way we can avoid complaining about a conflict when in fact
> both files are identical. And we can silently drop our copy.
>
> Cheers,
> --
> Raphaël Hertzog ◈ Debian Developer
>
> Discover the Debian Administrator's Handbook:
> → http://debian-handbook.info/get/
