On Wed, 2015-09-16 at 15:40 +0100, Ian Campbell wrote:
> > The intend of the symlink was that the conversion script would copy the target,
> > rather then follow the symlink. This sorta assumes that there are will be not
> > symlinks under dt-bindings which link to files inside dt-bindings and thus
> > should be preserved as symlinks.
> >
> > If the copy done in the script will follow the symlink then nothing should
> > really change for the split DT repo.
>
> Interesting idea. I'll see if I can make the conversion routine do that.
>
> TBH I have a horrid feeling that this is going to be beyond git rewrite
> -branch, at least in the mode it is used in today.
It seems that it is possible, after a fashion.
The downside is that either _all_ symlinks (which end up in the output) get
flattened or some sort of black/whitelisting is needed in the conversion
scripts themselves (potentially leading to issues or discontinuities) as
new stuff arrives).
It isn't possible AFAICT tell if a symlink points to something outside of
the converted set of paths and adjust, at least not without an unreasonable
amount of overhead on each commit during the rewrite.
Since this new file would be the first symlink in the converted repo I took
the former approach in my lash up to try it out, which was essentially to
insert the below script into the middle of the "git ls-files | rewrite
-paths.sed" pipeline which is called by git filter-branch --index-filter.
Not pretty but it does seem to work.
I want to avoid switching to --tree-filter if at all possible because it
checks out the tree and is therefore a _little_ I/O intensive ;-)
Ian.
#!/bin/bash
set -e
while read mode object stage path ; do
case "$mode" in
120000)
# symbolic link
deref=$(echo $GIT_COMMIT:$path | git cat-file --batch-check='deref-ok %(objectname)' --follow-symlinks)
case "$deref" in
deref-ok*)
echo -e "100644 ${deref#deref-ok } $stage\t$path"
;;
dangling*) # skip
;;
*) # the rest, missing etc
echo >&2 "Failed to parse symlink $GIT_COMMIT:$path $deref"
exit 1
;;
esac
;;
100*)
# Regular file, just pass through
echo -e "$mode $object $stage\t$path"
;;
*)
echo >&2 "Unhandled ls-tree entry: $line"
exit 1
;;
esac
done
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