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git add refuses a pathspec whose non-final component is a symlink. Staging such a path produces a tree git cannot check out next to the symlink. Walk each prefix of the workdir path and fail when a prefix is a symlink. Adding the symlink itself is unchanged. Fixes libgit2#7380
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git_index_add_bypathaccepts a path whose non-final component is a symlink (linkdir/file.txtwhenlinkdir→realdir).git addrefuses that pathspec, because staging it produces a tree git cannot check out next to the symlink.Walk each prefix of the workdir path and fail when a prefix is a symlink. Adding the symlink itself is unchanged.
test_index_bypath__add_rejects_path_beyond_symlinkcovers the rejection and the still-validgit_index_add_bypath(..., "linkdir")case.Fixes #7380.