pre-receive
- Git course
- Expert
- Lesson 6/32
- 4 min
Learn the server-side pre-receive hook.
What Is the pre-receive Hook?
`pre-receive` is a server-side hook that runs before a push operation is accepted. It can inspect reference updates sent to the server. If the script exits with a non-zero status, the push is rejected.
#!/bin/bash
echo "Checking push"Push Checks and Input Data
The `pre-receive` hook reads the old object ID, the new object ID, and the reference name for each update from standard input. These values can be used to enforce policies on incoming branches or tags.
while read old new ref
do
echo "$ref"
donePractice Reject Pushes to the Main Branch
Write a `pre-receive` script. Read input lines into the `old`, `new`, and `ref` variables. Reject the push if the reference is `refs/heads/main`. Otherwise, print that the check is complete.
Starter code
# Girdi satırlarını oku
# Referansı denetleSample solution
#!/bin/bash
while read old new ref
do
if [[ "$ref" == "refs/heads/main" ]]; then
echo "Ana dala push yasak" >&2
exit 1
fi
done
echo "Push kontrol edildi"Expected output
Push kontrol edildi
Questions and answers
Review the lesson questions together with their answers. To test yourself, solve the lesson interactively.
1 When does the pre-receive hook run?
- When a repository is cloned
- When commit history is displayed
- When a local file is saved
- Before the push is accepted by the server Correct answer
Explanation: `pre-receive` runs to determine whether an incoming push request should be accepted.
2 Read pre-receive Input
Question
while read old new ref
do
echo "$_____"
done____
Answer
while read old new ref
do
echo "$_____"
donerefExplanation: The `ref` variable contains the name of the reference being updated.
3 Match the pre-receive Concepts
| Term | Meaning |
|---|---|
pre-receive |
Runs before a push is accepted |
Standart girdi |
Carries update information |
Sunucu tarafı |
Runs on the remote repository |
Sıfır dışı çıkış kodu |
Rejects the push operation |