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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"shutil.unpack_archive skips false negatives containing '..'","articleBody":"I tried to extract a ZIP archive which contains a file named `somefile..ipynb` using `shutil.unpack_archive`.\r\n\r\nThis is right, one file inside the archive is named `somefile..ipynb`, with two dots, likely misspelled.\r\n\r\nThis leads to a problem, because `unpack_archive` will skip extracting this file [here](https://github.com/python/cpython/blob/d4426e8d001cfb4590911e2e7de6963e12529faf/Lib/shutil.py#L1261), because it assumes that the file contains relative path components. The file is missing quietly in the extracted archive.\r\n\r\nWhile skipping the file is different from standard behavior, the assumption that a file with a path containing two dots would be a relative path is also wrong. A relative path component is identified by \"../\" instead.\r\n\r\n\r\nI ~~can~~ am going to submit a PR.\r\n\r\n\u003c!-- gh-linked-prs --\u003e\r\n### Linked PRs\r\n* gh-111824\r\n\u003c!-- /gh-linked-prs --\u003e\r\n","author":{"url":"https://github.com/sepastian","@type":"Person","name":"sepastian"},"datePublished":"2023-11-06T18:37:01.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":8},"url":"https://github.com/111791/cpython/issues/111791"}