1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
|
#!/usr/bin/env bash
# Pre-commit hook: secret scan + shellcheck on staged shell files.
# Use `git commit --no-verify` to bypass for confirmed false positives.
set -u
REPO_ROOT="$(git rev-parse --show-toplevel)"
cd "$REPO_ROOT" || exit 1
# --- 1. Secret scan ---
# Patterns for common credentials. Scans only added lines in the staged diff.
#
# Two passes because case-sensitivity differs. AWS keys are uppercase, sk- keys
# lowercase, PEM headers fixed, so those match case-SENSITIVELY: under -i,
# AKIA[0-9A-Z]{16} matches any mixed-case 20-char run, which random base64 in an
# embedded image blob hits ~6% of the time per 100KB and blocks real commits.
# Only the keyword=value patterns need -i.
SECRET_PATTERNS_CS='(AKIA[0-9A-Z]{16}|sk-[a-zA-Z0-9_-]{20,}|-----BEGIN (RSA|DSA|EC|OPENSSH|PGP)( PRIVATE)?( KEY| KEY BLOCK)?-----)'
SECRET_PATTERNS_CI='(api[_-]?key|api[_-]?secret|auth[_-]?token|secret[_-]?key|bearer[_-]?token|access[_-]?token|password)[[:space:]]*[:=][[:space:]]*["'"'"'][^"'"'"']{16,}["'"'"']'
# Read the diff on its own so a git failure is distinguishable from "grep
# matched nothing". Both end in a non-zero status, but only one of them means
# there is nothing to scan; piping them together and swallowing the result with
# `|| true` made a broken git look like a clean commit — the scan searched an
# empty string, found nothing, and the secret went in.
if ! staged_diff="$(git diff --cached -U0 --diff-filter=AM)"; then
echo "pre-commit: cannot read the staged diff — refusing to skip the secret scan" >&2
exit 1
fi
# The greps keep their `|| true`: exiting 1 on no match is their normal result.
added_lines="$(printf '%s\n' "$staged_diff" | grep '^+' | grep -v '^+++' || true)"
cs_hits="$(printf '%s\n' "$added_lines" | grep -nE "$SECRET_PATTERNS_CS" || true)"
ci_hits="$(printf '%s\n' "$added_lines" | grep -niE "$SECRET_PATTERNS_CI" || true)"
# awk dedupes lines both passes matched, keeping first-seen order.
secret_hits="$(printf '%s\n%s' "$cs_hits" "$ci_hits" \
| grep -v '^[[:space:]]*$' | awk '!seen[$0]++' || true)"
if [ -n "$secret_hits" ]; then
echo "pre-commit: potential secret in staged changes:" >&2
echo "$secret_hits" >&2
echo "" >&2
echo "Review the lines above. If this is a false positive (test fixture, documentation)," >&2
echo "bypass with: git commit --no-verify" >&2
exit 1
fi
# --- 2. shellcheck on staged .sh / .bash files ---
# Same split as the secret scan above: a git failure must not read as "no files
# staged", which would skip the language check silently.
if ! staged_names="$(git diff --cached --name-only --diff-filter=AM)"; then
echo "pre-commit: cannot read the staged file list — refusing to skip the check" >&2
exit 1
fi
staged_sh="$(printf '%s\n' "$staged_names" | grep -E '\.(sh|bash)$' || true)"
if [ -n "$staged_sh" ] && command -v shellcheck >/dev/null 2>&1; then
failed=""
while IFS= read -r f; do
[ -z "$f" ] && continue
[ -f "$f" ] || continue
if ! shellcheck "$f" >/dev/null 2>&1; then
failed="${failed}${f}"$'\n'
fi
done <<< "$staged_sh"
if [ -n "$failed" ]; then
printf 'pre-commit: shellcheck failed on staged files:\n\n%s\n' "$failed" >&2
echo "Run: shellcheck <file> and fix the findings, then re-stage." >&2
exit 1
fi
fi
exit 0
|
