Mike-Swanson
6d065cf3ee
Adds a PreToolUse(Bash) hook (block-backslash-winpath.sh) that rejects commands redirecting/writing to a backslashed Windows drive path (e.g. > D:\claudetools\ .claude\current-mode). On Git Bash those strip the backslashes and PUA-substitute ':' (U+F03A), creating garbled junk files that have repeatedly polluted the repo. The hook quote-strips the command first, so the pattern appearing inside strings or commit messages does not false-trigger; Windows-tool args (icacls, pwsh -File) and forward-slash/relative paths pass. Wired into settings.json so every machine picks it up on /sync. Pairs with the sync.sh staging guard. Also: CLAUDE.md note on the Windows mode-write path; record jq install on GURU-KALI. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
38 lines
1.8 KiB
Bash
Executable File
38 lines
1.8 KiB
Bash
Executable File
#!/usr/bin/env bash
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# PreToolUse(Bash) hook: block bash commands that REDIRECT/WRITE to a backslashed
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# Windows drive path (e.g. `echo x > D:\claudetools\.claude\current-mode`).
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#
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# Why: under Git Bash / MSYS, a backslash is an escape char. `> D:\foo\bar`
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# strips the backslashes and substitutes the illegal ':' with the Unicode
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# Private-Use char U+F03A, creating a garbled junk file in the CWD instead of
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# writing the intended path. These junk files then pollute the repo. Use a
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# relative path or forward slashes (/d/claudetools/... or D:/claudetools/...).
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#
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# Only flags WRITE targets (> / >> / tee). Windows-tool arguments like
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# `icacls "D:\Homes"` or `pwsh -File C:\x.ps1` are NOT redirects, so they pass.
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input=$(cat)
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cmd=$(echo "$input" | jq -r '.tool_input.command // ""' 2>/dev/null)
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# Strip quoted substrings first, so the pattern appearing INSIDE a string or a
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# commit message (e.g. git commit -m "... > D:\\path ...") does not false-trigger.
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# A real bareword redirect target lives OUTSIDE quotes. (A redirect to a *quoted*
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# path like `> "D:\x"` is rarer and is still caught by sync.sh's staging guard.)
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bare=$(printf '%s' "$cmd" | sed -E "s/'[^']*'//g; s/\"[^\"]*\"//g")
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# Block when, after quote-stripping, a redirect/tee writes to a bareword X:\ path.
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if printf '%s' "$bare" | grep -qiP '(>>?|tee)\s*[A-Za-z]:\\'; then
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echo "BLOCKED: do not redirect/write to a backslashed Windows path in bash."
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echo ""
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echo "Git Bash strips the backslashes and PUA-substitutes ':', creating a"
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echo "garbled junk file instead of writing the path you intended."
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echo ""
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echo "Use one of these instead:"
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echo " - relative path: echo dev > .claude/current-mode"
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echo " - MSYS forward-slash: echo dev > /d/claudetools/.claude/current-mode"
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echo " - drive forward-slash: echo dev > D:/claudetools/.claude/current-mode"
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exit 2
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fi
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exit 0
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