Add "S_IFDIRLNK" file mode infrastructure for git links
This just adds the basic helper functions to recognize and work with git tree entries that are links to other git repositories ("subprojects"). They still aren't actually connected up to any of the code-paths, but now all the infrastructure is in place. The next commit will start actually adding actual subproject support. Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org> Signed-off-by: NJunio C Hamano <junkio@cox.net>
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