#!/bin/sh
#
# Copyright (c) 2009, Red Hat Inc, Author: Michael S. Tsirkin (mst@redhat.com)
#

test_description='test clone --reference'
. ./test-lib.sh

base_dir=$(pwd)

test_alternate_is_used () {
        alternates_file="$1" &&
        working_dir="$2" &&
        test_line_count = 1 "$alternates_file" &&
        echo "0 objects, 0 kilobytes" >expect &&
        git -C "$working_dir" count-objects >actual &&
        test_cmp expect actual
}

test_expect_success 'preparing first repository' '
        test_create_repo A &&
        (
                cd A &&
                echo first >file1 &&
                git add file1 &&
                git commit -m A-initial
        )
'

test_expect_success 'preparing second repository' '
        git clone A B &&
        (
                cd B &&
                echo second >file2 &&
                git add file2 &&
                git commit -m B-addition &&
                git repack -a -d &&
                git prune
        )
'

test_expect_success 'preparing superproject' '
        test_create_repo super &&
        (
                cd super &&
                echo file >file &&
                git add file &&
                git commit -m B-super-initial
        )
'

test_expect_success 'submodule add --reference uses alternates' '
        (
                cd super &&
                git submodule add --reference ../B "file://$base_dir/A" sub &&
                git commit -m B-super-added &&
                git repack -ad
        ) &&
        test_alternate_is_used super/.git/modules/sub/objects/info/alternates super/sub
'

test_expect_success 'submodule add --reference with --dissociate does not use alternates' '
        (
                cd super &&
                git submodule add --reference ../B --dissociate "file://$base_dir/A" sub-dissociate &&
                git commit -m B-super-added &&
                git repack -ad
        ) &&
        test_path_is_missing super/.git/modules/sub-dissociate/objects/info/alternates
'

test_expect_success 'that reference gets used with add' '
        (
                cd super/sub &&
                echo "0 objects, 0 kilobytes" >expected &&
                git count-objects >current &&
                diff expected current
        )
'

# The tests up to this point, and repositories created by them
# (A, B, super and super/sub), are about setting up the stage
# for subsequent tests and meant to be kept throughout the
# remainder of the test.
# Tests from here on, if they create their own test repository,
# are expected to clean after themselves.

test_expect_success 'updating superproject keeps alternates' '
        test_when_finished "rm -rf super-clone" &&
        git clone super super-clone &&
        git -C super-clone submodule update --init --reference ../B &&
        test_alternate_is_used super-clone/.git/modules/sub/objects/info/alternates super-clone/sub
'

test_expect_success 'updating superproject with --dissociate does not keep alternates' '
        test_when_finished "rm -rf super-clone" &&
        git clone super super-clone &&
        git -C super-clone submodule update --init --reference ../B --dissociate &&
        test_path_is_missing super-clone/.git/modules/sub/objects/info/alternates
'

test_expect_success 'submodules use alternates when cloning a superproject' '
        test_when_finished "rm -rf super-clone" &&
        git clone --reference super --recursive super super-clone &&
        (
                cd super-clone &&
                # test superproject has alternates setup correctly
                test_alternate_is_used .git/objects/info/alternates . &&
                # test submodule has correct setup
                test_alternate_is_used .git/modules/sub/objects/info/alternates sub
        )
'

test_expect_success 'missing submodule alternate fails clone and submodule update' '
        test_when_finished "rm -rf super-clone" &&
        git clone super super2 &&
        test_must_fail git clone --recursive --reference super2 super2 super-clone &&
        (
                cd super-clone &&
                # test superproject has alternates setup correctly
                test_alternate_is_used .git/objects/info/alternates . &&
                # update of the submodule succeeds
                test_must_fail git submodule update --init &&
                # and we have no alternates:
                test_must_fail test_alternate_is_used .git/modules/sub/objects/info/alternates sub &&
                test_must_fail test_path_is_file sub/file1
        )
'

test_expect_success 'ignoring missing submodule alternates passes clone and submodule update' '
        test_when_finished "rm -rf super-clone" &&
        git clone --reference-if-able super2 --recursive super2 super-clone &&
        (
                cd super-clone &&
                # test superproject has alternates setup correctly
                test_alternate_is_used .git/objects/info/alternates . &&
                # update of the submodule succeeds
                git submodule update --init &&
                # and we have no alternates:
                test_must_fail test_alternate_is_used .git/modules/sub/objects/info/alternates sub &&
                test_path_is_file sub/file1
        )
'

test_expect_success 'preparing second superproject with a nested submodule plus partial clone' '
        test_create_repo supersuper &&
        (
                cd supersuper &&
                echo "I am super super." >file &&
                git add file &&
                git commit -m B-super-super-initial &&
                git submodule add "file://$base_dir/super" subwithsub &&
                git commit -m B-super-super-added &&
                git submodule update --init --recursive &&
                git repack -ad
        ) &&
        git clone supersuper supersuper2 &&
        (
                cd supersuper2 &&
                git submodule update --init
        )
'

# At this point there are three root-level positories: A, B, super and super2

test_expect_success 'nested submodule alternate in works and is actually used' '
        test_when_finished "rm -rf supersuper-clone" &&
        git clone --recursive --reference supersuper supersuper supersuper-clone &&
        (
                cd supersuper-clone &&
                # test superproject has alternates setup correctly
                test_alternate_is_used .git/objects/info/alternates . &&
                # immediate submodule has alternate:
                test_alternate_is_used .git/modules/subwithsub/objects/info/alternates subwithsub &&
                # nested submodule also has alternate:
                test_alternate_is_used .git/modules/subwithsub/modules/sub/objects/info/alternates subwithsub/sub
        )
'

check_that_two_of_three_alternates_are_used() {
        test_alternate_is_used .git/objects/info/alternates . &&
        # immediate submodule has alternate:
        test_alternate_is_used .git/modules/subwithsub/objects/info/alternates subwithsub &&
        # but nested submodule has no alternate:
        test_must_fail test_alternate_is_used .git/modules/subwithsub/modules/sub/objects/info/alternates subwithsub/sub
}


test_expect_success 'missing nested submodule alternate fails clone and submodule update' '
        test_when_finished "rm -rf supersuper-clone" &&
        test_must_fail git clone --recursive --reference supersuper2 supersuper2 supersuper-clone &&
        (
                cd supersuper-clone &&
                check_that_two_of_three_alternates_are_used &&
                # update of the submodule fails
                test_must_fail git submodule update --init --recursive
        )
'

test_expect_success 'missing nested submodule alternate in --reference-if-able mode' '
        test_when_finished "rm -rf supersuper-clone" &&
        git clone --recursive --reference-if-able supersuper2 supersuper2 supersuper-clone &&
        (
                cd supersuper-clone &&
                check_that_two_of_three_alternates_are_used &&
                # update of the submodule succeeds
                git submodule update --init --recursive
        )
'

test_done