fast-import: disallow "." and ".." path components #1831
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If a user specified e.g. M 100644 :1 ../some-file then fast-import previously would happily create a git history where there is a tree in the top-level directory named "..", and with a file inside that directory named "some-file". The top-level ".." directory causes problems. While git checkout will die with errors and fsck will report hasDotdot problems, the user is going to have problems trying to remove the problematic file. Simply avoid creating this bad history in the first place. Signed-off-by: Elijah Newren <[email protected]>
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