Git hook to ensure commit starts with ticket number

commit-msg

#!/usr/bin/env bash

# commit message file
commit_msg_file="$1"

valid_comment_prefix="^#?[0-9]{6,10} .+"


error() 
{
    cp "$commit_msg_file" "_gitmsg.saved.txt"

    echo "GIT COMMIT-MSG HOOK ERROR:"
    echo "$1"
    echo ""
    echo "Original checkin message has been stored in '_gitmsg.saved.txt'"
    echo "Your commit will be rejected."
    echo "You should update your commit and try again."

    exit 1
}

commit_msg=$(cat "$commit_msg_file")
if [[ ! $commit_msg =~ $valid_comment_prefix ]]
then
    error "Comment must match: $valid_comment_prefix"
fi

# additional checks based on comment lines
#lineno=0
#while read -r line
#do
#    # Ignore comment lines (don't count line number either)
#    [[ "$line" =~ ^#.* ]] && continue
#
#    let lineno+=1
#    length=${#line}
#
#    if [[ $lineno -eq 1 ]]
#    then
#        # Subject line tests
#        [[ ! "$line" =~ $valid_comment_prefix ]] && error "Comment must match: $valid_comment_prefix"
#    # else
#        # Rules related to the commit message body
#        [[ $length -gt 100 ]] && error "Wrap each line at 100 characters"
#    fi
#
#done < "$commit_msg_file"

exit 0