Git commit-msg Hook to Check Message Format

The commit-msg hook runs after you write the commit message. This one allows only messages like feat: add login or fix: cart total, which keeps the history easy to read.

#!/bin/sh
# Allow only messages that start with feat:, fix:, docs: or chore:

MSG_FILE="$1"
FIRST_LINE=$(head -n 1 "$MSG_FILE")

if ! echo "$FIRST_LINE" | grep -E '^(feat|fix|docs|chore): .+' > /dev/null; then
  echo "Bad commit message: $FIRST_LINE"
  echo "Use: feat: ..., fix: ..., docs: ... or chore: ..."
  exit 1
fi

How it works

• Git gives the hook the path of a temporary file with the message as the first argument ($1).
• The script reads the first line and checks it with a regular expression.
• When the script exits with 1, Git cancels the commit and the message is not saved.

• Previous Code

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