The function file_wd_isdir() seems to have a number of bugs when used
with symbolic links. This manifests on macOS in particular (where /tmp
links to private/tmp – note that the link is relative), when temporary
directories are created, e.g. for "fossil diff --checkin ...".
* Relative links are not properly followed. They are treated as being
relative to the current directory, rather than the source of the symlink.
* Symlinks pointing to themselves will trigger infinite recursion.
* The db_allow_symlinks() logic should probably not apply to directories
outside a checkout (such as /tmp).
Reimer Behrends
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