2. Git Hooks

2.1. About Hooks

• .git/hooks/pre-commit

• chmod +x .git/hooks/pre-commit

• #!/bin/sh

• set +e - Print an error to but the script will continue

• set -e - Exit immediately if a command exits with a non-zero status

• trap

• exit 0 (success) - allows to commit

• exit 1 (error) - prevents commit

2.2. Possible Hooks

• applypatch-msg

• commit-msg

• fsmonitor-watchman

• post-update

• pre-applypatch

• pre-commit

• pre-merge-commit

• pre-push

• pre-rebase

• pre-receive

• prepare-commit-msg

• update

2.3. Branch Hook

$ git log --format='"%ai", "%h", "%an", "%ae", "%s"' > ~/Desktop/git-log.csv
"2020-10-14 01:04:38 +0200", "d5a4d6b", "Matt Harasymczuk", "matt@astrotech.io", "MYPROJECT-10 git commit message #time 69m"

$ git log --format='"%aI", "%h", "%an", "%ae", "%s"' > ~/Desktop/git-log.csv
"2020-10-14T01:04:38+02:00", "d5a4d6b", "Matt Harasymczuk", "matt@astrotech.io", "MYPROJECT-10 git commit message #time 69m"

Code 2.2. .git/hooks/prepare-commit-msg

#!/bin/sh
#
# @author Matt Harasymczuk <matt@astrotech.io>
# @since 2012-10-23
# @updated 2022-07-17
#
# This simple hook gets Jira issue ID from the branch you are currently
# committing to. If you used Jira development panel "Create Branch",
# your branch name should be: "feature/MYPROJECT-69-some-issue-summary"
# and in such case it would get "MYPROJECT-69". Then hook prepends issue
# ID to your current commit message linking commit and Jira issue together.
# You'll never forget about adding issue id to the commit message anymore!
#
# To install hook just paste following script (with this comment) in:
# ``.git/hooks/prepare-commit-msg``
#
# On *nix machines (macOS, Linux, etc) add executable rights:
# ``chmod +x .git/hooks/prepare-commit-msg``
#
# That's it. You can commit to test if it works.
# Remember before committing to check out branch with proper name, such as:
# ``feature/MYPROJECT-69-my-issue-summary``

PATTERN='[A-Z]{2,10}-[0-9]{1,6}'

currentBranch=$(git branch --show-current)
issueKey=$(echo $currentBranch |egrep --only-matching $PATTERN)

commitMsgFile=$1
commitMsgOld=$(cat $commitMsgFile)
commitMsgNew="$issueKey $commitMsgOld"

if [ -z "$issueKey" ]; then
    echo "You are currently on a branch without JIRA issue ID in its name."
    echo "Changes were not committed."
    echo ""
    echo "If you want to commit anyway, just remove executable rights for this hook:"
    echo "chmod -x .git/hooks/prepare-commit-msg"
    echo ""
    echo "But remember to re-enable it later on, by executing:"
    echo "chmod +x .git/hooks/prepare-commit-msg"
    exit 1
else
    echo "Current Branch: $currentBranch"
    echo "Jira Issue Key: $issueKey"
    echo "Commit Msg Old: $commitMsgOld"
    echo "Commit Msg New: $commitMsgNew"
    echo ""

    echo $commitMsgNew > $commitMsgFile
    exit 0
fi

2.4. Assignments

1. Create Git hook which enforces JIRA issue key in commit message

2. Create Git hook which copies JIRA issue key from branch name to commit message