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+#!/bin/sh
+
+test_description='push to a repository that borrows from elsewhere'
+
+. ./test-lib.sh
+
+test_expect_success setup '
+ mkdir alice-pub &&
+ (
+ cd alice-pub &&
+ GIT_DIR=. git init
+ ) &&
+ mkdir alice-work &&
+ (
+ cd alice-work &&
+ git init &&
+ >file &&
+ git add . &&
+ git commit -m initial &&
+ git push ../alice-pub master
+ ) &&
+
+ # Project Bob is a fork of project Alice
+ mkdir bob-pub &&
+ (
+ cd bob-pub &&
+ GIT_DIR=. git init &&
+ mkdir -p objects/info &&
+ echo ../../alice-pub/objects >objects/info/alternates
+ ) &&
+ git clone alice-pub bob-work &&
+ (
+ cd bob-work &&
+ git push ../bob-pub master
+ )
+'
+
+test_expect_success 'alice works and pushes' '
+ (
+ cd alice-work &&
+ echo more >file &&
+ git commit -a -m second &&
+ git push ../alice-pub
+ )
+'
+
+test_expect_success 'bob fetches from alice, works and pushes' '
+ (
+ # Bob acquires what Alice did in his work tree first.
+ # Even though these objects are not directly in
+ # the public repository of Bob, this push does not
+ # need to send the commit Bob received from Alice
+ # to his public repository, as all the object Alice
+ # has at her public repository are available to it
+ # via its alternates.
+ cd bob-work &&
+ git pull ../alice-pub master &&
+ echo more bob >file &&
+ git commit -a -m third &&
+ git push ../bob-pub
+ ) &&
+
+ # Check that the second commit by Alice is not sent
+ # to ../bob-pub
+ (
+ cd bob-pub &&
+ second=$(git rev-parse HEAD^) &&
+ rm -f objects/info/alternates &&
+ test_must_fail git cat-file -t $second &&
+ echo ../../alice-pub/objects >objects/info/alternates
+ )
+'
+
+test_expect_success 'clean-up in case the previous failed' '
+ (
+ cd bob-pub &&
+ echo ../../alice-pub/objects >objects/info/alternates
+ )
+'
+
+test_expect_success 'alice works and pushes again' '
+ (
+ # Alice does not care what Bob does. She does not
+ # even have to be aware of his existence. She just
+ # keeps working and pushing
+ cd alice-work &&
+ echo more alice >file &&
+ git commit -a -m fourth &&
+ git push ../alice-pub
+ )
+'
+
+test_expect_success 'bob works and pushes' '
+ (
+ # This time Bob does not pull from Alice, and
+ # the master branch at her public repository points
+ # at a commit Bob does not know about. This should
+ # not prevent the push by Bob from succeeding.
+ cd bob-work &&
+ echo yet more bob >file &&
+ git commit -a -m fifth &&
+ git push ../bob-pub
+ )
+'
+
+test_expect_success 'alice works and pushes yet again' '
+ (
+ # Alice does not care what Bob does. She does not
+ # even have to be aware of his existence. She just
+ # keeps working and pushing
+ cd alice-work &&
+ echo more and more alice >file &&
+ git commit -a -m sixth.1 &&
+ echo more and more alice >>file &&
+ git commit -a -m sixth.2 &&
+ echo more and more alice >>file &&
+ git commit -a -m sixth.3 &&
+ git push ../alice-pub
+ )
+'
+
+test_expect_success 'bob works and pushes again' '
+ (
+ cd alice-pub &&
+ git cat-file commit master >../bob-work/commit
+ )
+ (
+ # This time Bob does not pull from Alice, and
+ # the master branch at her public repository points
+ # at a commit Bob does not fully know about, but
+ # he happens to have the commit object (but not the
+ # necessary tree) in his repository from Alice.
+ # This should not prevent the push by Bob from
+ # succeeding.
+ cd bob-work &&
+ git hash-object -t commit -w commit &&
+ echo even more bob >file &&
+ git commit -a -m seventh &&
+ git push ../bob-pub
+ )
+'
+
+test_done