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28 lines
1.1 KiB
28 lines
1.1 KiB
2 years ago
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# Sparse-Checkout
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This code tries to simulate the way `sparse-checkout` works in recent Git
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versions.
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## The Problem
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The problem is that the behaviour of `sparse-checkout` changed somewhere in the
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line. In most recent versions, `sparse-checkout init`, on a clone, will hide
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every single file; older versions, though, will refuse to init the
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`sparse-checkout` if that would leave the current directory empty.
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## Solution
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The idea is to push `update-index --skip-worktree` to tag a file as "being
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ignored" (Git will always assume the file checksum is still the same as in the
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index, no matter what you do with the file). Then, when a user wants to
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re-enable the directory/file, use `update-index --no-skip-worktree`.
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Although that sounds simple, there an issue that Git deals only with files and
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not directories, and trying to disable/enable the file in the index requires to
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pass the files; for example, on the re-enable, how to find the names of the
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files we just deleted?
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That requires a combination of use with `ls-files --cached [pattern]`. This way
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we can get all the files that need to be pushed back/ignored, reading directly
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from the Git information.
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