base_dir=$(pwd)
-U=$base_dir/UPLOAD_LOG
-
-test_expect_success 'preparing first repository' \
-'test_create_repo A && cd A &&
-echo first > file1 &&
-git add file1 &&
-git commit -m A-initial'
-
-cd "$base_dir"
-
-test_expect_success 'preparing second repository' \
-'git clone A B && cd B &&
-echo second > file2 &&
-git add file2 &&
-git commit -m B-addition &&
-git repack -a -d &&
-git prune'
-
-cd "$base_dir"
-
-test_expect_success 'preparing superproject' \
-'test_create_repo super && cd super &&
-echo file > file &&
-git add file &&
-git commit -m B-super-initial'
-
-cd "$base_dir"
-
-test_expect_success 'submodule add --reference' \
-'cd super && git submodule add --reference ../B "file://$base_dir/A" sub &&
-git commit -m B-super-added'
-
-cd "$base_dir"
-
-test_expect_success 'after add: existence of info/alternates' \
-'test_line_count = 1 super/.git/modules/sub/objects/info/alternates'
-
-cd "$base_dir"
-
-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'
-
-cd "$base_dir"
-
-test_expect_success 'cloning superproject' \
-'git clone super super-clone'
-
-cd "$base_dir"
-
-test_expect_success 'update with reference' \
-'cd super-clone && git submodule update --init --reference ../B'
-
-cd "$base_dir"
-
-test_expect_success 'after update: existence of info/alternates' \
-'test_line_count = 1 super-clone/.git/modules/sub/objects/info/alternates'
-
-cd "$base_dir"
-
-test_expect_success 'that reference gets used with update' \
-'cd super-clone/sub &&
-echo "0 objects, 0 kilobytes" > expected &&
-git count-objects > current &&
-diff expected current'
-
-cd "$base_dir"
+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