Re: [PATCH 6/8] ls-tree: work from subdirectory.

Linus Torvalds [off-list ref] writes:

And this is just ugly.

git-ls-tree should be rewritten to use a pathspec the same way everybody 
else does. Right now it's the odd man out: if you do

	git-ls-tree HEAD divers/char drivers/

it will show the same files _twice_, which is not how pathspecs in general 
work.

True; that is more or less deliberate.  The behaviour is
modelled after what "/bin/ls -a" does.

How about this patch? It breaks some of the git-ls-tree tests, but it 
makes git-ls-tree work a lot more like other git pathspec commands, and it 
removes more than 150 lines by re-using the recursive tree traversal (but 
the "-d" flag is gone for good, so I'm not pushing this too hard).

I am all for it if it were just me, and all the more so for its
cleanup value.  I do not think anybody uses "-d" (none of
Cogito, StGIT nor gitweb seems to use it, and I have not seen
Jason McMullan, who wanted to have a way in ls-tree to see just
the object name of a subtree, on the list for a while); I
suspect that nobody would miss that option.

However, this patch changes its behaviour in another way, and
that could impact Porcelains more than the removal of the "-d"
option.  Currently, "git-ls-tree <tree> $dir" shows what
"/bin/ls -a -1 $dir" would show --- the tree for $dir itself and
its immediate children.  This patch changes it to show the tree
for $dir and nothing else.  In effect, "-d" becomes the default
that you cannot turn off, except using "-r" to allow it go all
the way down.

I do not think StGIT is affected; it does not use ls-tree at all.
gitweb is not affected either.  It does not use paths specifier.

Cogito might need a slight adjustment.

 - cg-admin-cat may want to use -r for the first one (${ARGS[@]}
   may name a directory), but that also would change the
   behaviour.  The current one shows only one level, instead of
   going all the way down.

 - cg-log:117 uses ls-tree without -r, but I have a feeling that
   it might be just a bug, even with the current ls-tree; I
   suspect the user would not see things in subdirectories.
   This is only for the initial commit so it may or may not
   matter much.

 - cg-restore already uses ls-tree -r so that would not be
   affected.