--- /dev/null
+# Create a submodule layout used for all tests below.
+#
+# The following use cases are covered:
+# - New submodule (no_submodule => add_sub1)
+# - Removed submodule (add_sub1 => remove_sub1)
+# - Updated submodule (add_sub1 => modify_sub1)
+# - Submodule updated to invalid commit (add_sub1 => invalid_sub1)
+# - Submodule updated from invalid commit (invalid_sub1 => valid_sub1)
+# - Submodule replaced by tracked files in directory (add_sub1 =>
+# replace_sub1_with_directory)
+# - Directory containing tracked files replaced by submodule
+# (replace_sub1_with_directory => replace_directory_with_sub1)
+# - Submodule replaced by tracked file with the same name (add_sub1 =>
+# replace_sub1_with_file)
+# - Tracked file replaced by submodule (replace_sub1_with_file =>
+# replace_file_with_sub1)
+#
+# --O-----O
+# / ^ replace_directory_with_sub1
+# / replace_sub1_with_directory
+# /----O
+# / ^
+# / modify_sub1
+# O------O-------O
+# ^ ^\ ^
+# | | \ remove_sub1
+# | | -----O-----O
+# | | \ ^ replace_file_with_sub1
+# | | \ replace_sub1_with_file
+# | add_sub1 --O-----O
+# no_submodule ^ valid_sub1
+# invalid_sub1
+#
+create_lib_submodule_repo () {
+ git init submodule_update_repo &&
+ (
+ cd submodule_update_repo &&
+ echo "expect" >>.gitignore &&
+ echo "actual" >>.gitignore &&
+ echo "x" >file1 &&
+ echo "y" >file2 &&
+ git add .gitignore file1 file2 &&
+ git commit -m "Base" &&
+ git branch "no_submodule" &&
+
+ git checkout -b "add_sub1" &&
+ git submodule add ./. sub1 &&
+ git config -f .gitmodules submodule.sub1.ignore all &&
+ git config submodule.sub1.ignore all &&
+ git add .gitmodules &&
+ git commit -m "Add sub1" &&
+ git checkout -b remove_sub1 &&
+ git revert HEAD &&
+
+ git checkout -b "modify_sub1" "add_sub1" &&
+ git submodule update &&
+ (
+ cd sub1 &&
+ git fetch &&
+ git checkout -b "modifications" &&
+ echo "z" >file2 &&
+ echo "x" >file3 &&
+ git add file2 file3 &&
+ git commit -m "modified file2 and added file3" &&
+ git push origin modifications
+ ) &&
+ git add sub1 &&
+ git commit -m "Modify sub1" &&
+
+ git checkout -b "replace_sub1_with_directory" "add_sub1" &&
+ git submodule update &&
+ (
+ cd sub1 &&
+ git checkout modifications
+ ) &&
+ git rm --cached sub1 &&
+ rm sub1/.git* &&
+ git config -f .gitmodules --remove-section "submodule.sub1" &&
+ git add .gitmodules sub1/* &&
+ git commit -m "Replace sub1 with directory" &&
+ git checkout -b replace_directory_with_sub1 &&
+ git revert HEAD &&
+
+ git checkout -b "replace_sub1_with_file" "add_sub1" &&
+ git rm sub1 &&
+ echo "content" >sub1 &&
+ git add sub1 &&
+ git commit -m "Replace sub1 with file" &&
+ git checkout -b replace_file_with_sub1 &&
+ git revert HEAD &&
+
+ git checkout -b "invalid_sub1" "add_sub1" &&
+ git update-index --cacheinfo 160000 0123456789012345678901234567890123456789 sub1 &&
+ git commit -m "Invalid sub1 commit" &&
+ git checkout -b valid_sub1 &&
+ git revert HEAD &&
+ git checkout master
+ )
+}
+
+# Helper function to replace gitfile with .git directory
+replace_gitfile_with_git_dir () {
+ (
+ cd "$1" &&
+ git_dir="$(git rev-parse --git-dir)" &&
+ rm -f .git &&
+ cp -R "$git_dir" .git &&
+ GIT_WORK_TREE=. git config --unset core.worktree
+ )
+}
+
+# Test that the .git directory in the submodule is unchanged (except for the
+# core.worktree setting, which appears only in $GIT_DIR/modules/$1/config).
+# Call this function before test_submodule_content as the latter might
+# write the index file leading to false positive index differences.
+#
+# Note that this only supports submodules at the root level of the
+# superproject, with the default name, i.e. same as its path.
+test_git_directory_is_unchanged () {
+ (
+ cd ".git/modules/$1" &&
+ # does core.worktree point at the right place?
+ test "$(git config core.worktree)" = "../../../$1" &&
+ # remove it temporarily before comparing, as
+ # "$1/.git/config" lacks it...
+ git config --unset core.worktree
+ ) &&
+ diff -r ".git/modules/$1" "$1/.git" &&
+ (
+ # ... and then restore.
+ cd ".git/modules/$1" &&
+ git config core.worktree "../../../$1"
+ )
+}
+
+# Helper function to be executed at the start of every test below, it sets up
+# the submodule repo if it doesn't exist and configures the most problematic
+# settings for diff.ignoreSubmodules.
+prolog () {
+ (test -d submodule_update_repo || create_lib_submodule_repo) &&
+ test_config_global diff.ignoreSubmodules all &&
+ test_config diff.ignoreSubmodules all
+}
+
+# Helper function to bring work tree back into the state given by the
+# commit. This includes trying to populate sub1 accordingly if it exists and
+# should be updated to an existing commit.
+reset_work_tree_to () {
+ rm -rf submodule_update &&
+ git clone submodule_update_repo submodule_update &&
+ (
+ cd submodule_update &&
+ rm -rf sub1 &&
+ git checkout -f "$1" &&
+ git status -u -s >actual &&
+ test_must_be_empty actual &&
+ sha1=$(git rev-parse --revs-only HEAD:sub1) &&
+ if test -n "$sha1" &&
+ test $(cd "sub1" && git rev-parse --verify "$sha1^{commit}")
+ then
+ git submodule update --init --recursive "sub1"
+ fi
+ )
+}
+
+# Test that the superproject contains the content according to commit "$1"
+# (the work tree must match the index for everything but submodules but the
+# index must exactly match the given commit including any submodule SHA-1s).
+test_superproject_content () {
+ git diff-index --cached "$1" >actual &&
+ test_must_be_empty actual &&
+ git diff-files --ignore-submodules >actual &&
+ test_must_be_empty actual
+}
+
+# Test that the given submodule at path "$1" contains the content according
+# to the submodule commit recorded in the superproject's commit "$2"
+test_submodule_content () {
+ if test $# != 2
+ then
+ echo "test_submodule_content needs two arguments"
+ return 1
+ fi &&
+ submodule="$1" &&
+ commit="$2" &&
+ test -d "$submodule"/ &&
+ if ! test -f "$submodule"/.git && ! test -d "$submodule"/.git
+ then
+ echo "Submodule $submodule is not populated"
+ return 1
+ fi &&
+ sha1=$(git rev-parse --verify "$commit:$submodule") &&
+ if test -z "$sha1"
+ then
+ echo "Couldn't retrieve SHA-1 of $submodule for $commit"
+ return 1
+ fi &&
+ (
+ cd "$submodule" &&
+ git status -u -s >actual &&
+ test_must_be_empty actual &&
+ git diff "$sha1" >actual &&
+ test_must_be_empty actual
+ )
+}
+
+# Test that the following transitions are correctly handled:
+# - Updated submodule
+# - New submodule
+# - Removed submodule
+# - Directory containing tracked files replaced by submodule
+# - Submodule replaced by tracked files in directory
+# - Submodule replaced by tracked file with the same name
+# - tracked file replaced by submodule
+#
+# The default is that submodule contents aren't changed until "git submodule
+# update" is run. And even then that command doesn't delete the work tree of
+# a removed submodule.
+#
+# Removing a submodule containing a .git directory must fail even when forced
+# to protect the history!
+#
+
+# Test that submodule contents are currently not updated when switching
+# between commits that change a submodule.
+test_submodule_switch () {
+ command="$1"
+ ######################### Appearing submodule #########################
+ # Switching to a commit letting a submodule appear creates empty dir ...
+ if test "$KNOWN_FAILURE_STASH_DOES_IGNORE_SUBMODULE_CHANGES" = 1
+ then
+ # Restoring stash fails to restore submodule index entry
+ RESULT="failure"
+ else
+ RESULT="success"
+ fi
+ test_expect_$RESULT "$command: added submodule creates empty directory" '
+ prolog &&
+ reset_work_tree_to no_submodule &&
+ (
+ cd submodule_update &&
+ git branch -t add_sub1 origin/add_sub1 &&
+ $command add_sub1 &&
+ test_superproject_content origin/add_sub1 &&
+ test_dir_is_empty sub1 &&
+ git submodule update --init --recursive &&
+ test_submodule_content sub1 origin/add_sub1
+ )
+ '
+ # ... and doesn't care if it already exists ...
+ test_expect_$RESULT "$command: added submodule leaves existing empty directory alone" '
+ prolog &&
+ reset_work_tree_to no_submodule &&
+ (
+ cd submodule_update &&
+ mkdir sub1 &&
+ git branch -t add_sub1 origin/add_sub1 &&
+ $command add_sub1 &&
+ test_superproject_content origin/add_sub1 &&
+ test_dir_is_empty sub1 &&
+ git submodule update --init --recursive &&
+ test_submodule_content sub1 origin/add_sub1
+ )
+ '
+ # ... unless there is an untracked file in its place.
+ test_expect_success "$command: added submodule doesn't remove untracked unignored file with same name" '
+ prolog &&
+ reset_work_tree_to no_submodule &&
+ (
+ cd submodule_update &&
+ git branch -t add_sub1 origin/add_sub1 &&
+ >sub1 &&
+ test_must_fail $command add_sub1 &&
+ test_superproject_content origin/no_submodule &&
+ test_must_be_empty sub1
+ )
+ '
+ # Replacing a tracked file with a submodule produces an empty
+ # directory ...
+ test_expect_$RESULT "$command: replace tracked file with submodule creates empty directory" '
+ prolog &&
+ reset_work_tree_to replace_sub1_with_file &&
+ (
+ cd submodule_update &&
+ git branch -t replace_file_with_sub1 origin/replace_file_with_sub1 &&
+ $command replace_file_with_sub1 &&
+ test_superproject_content origin/replace_file_with_sub1 &&
+ test_dir_is_empty sub1 &&
+ git submodule update --init --recursive &&
+ test_submodule_content sub1 origin/replace_file_with_sub1
+ )
+ '
+ # ... as does removing a directory with tracked files with a
+ # submodule.
+ if test "$KNOWN_FAILURE_NOFF_MERGE_DOESNT_CREATE_EMPTY_SUBMODULE_DIR" = 1
+ then
+ # Non fast-forward merges fail with "Directory sub1 doesn't
+ # exist. sub1" because the empty submodule directory is not
+ # created
+ RESULT="failure"
+ else
+ RESULT="success"
+ fi
+ test_expect_$RESULT "$command: replace directory with submodule" '
+ prolog &&
+ reset_work_tree_to replace_sub1_with_directory &&
+ (
+ cd submodule_update &&
+ git branch -t replace_directory_with_sub1 origin/replace_directory_with_sub1 &&
+ $command replace_directory_with_sub1 &&
+ test_superproject_content origin/replace_directory_with_sub1 &&
+ test_dir_is_empty sub1 &&
+ git submodule update --init --recursive &&
+ test_submodule_content sub1 origin/replace_directory_with_sub1
+ )
+ '
+
+ ######################## Disappearing submodule #######################
+ # Removing a submodule doesn't remove its work tree ...
+ if test "$KNOWN_FAILURE_STASH_DOES_IGNORE_SUBMODULE_CHANGES" = 1
+ then
+ RESULT="failure"
+ else
+ RESULT="success"
+ fi
+ test_expect_$RESULT "$command: removed submodule leaves submodule directory and its contents in place" '
+ prolog &&
+ reset_work_tree_to add_sub1 &&
+ (
+ cd submodule_update &&
+ git branch -t remove_sub1 origin/remove_sub1 &&
+ $command remove_sub1 &&
+ test_superproject_content origin/remove_sub1 &&
+ test_submodule_content sub1 origin/add_sub1
+ )
+ '
+ # ... especially when it contains a .git directory.
+ test_expect_$RESULT "$command: removed submodule leaves submodule containing a .git directory alone" '
+ prolog &&
+ reset_work_tree_to add_sub1 &&
+ (
+ cd submodule_update &&
+ git branch -t remove_sub1 origin/remove_sub1 &&
+ replace_gitfile_with_git_dir sub1 &&
+ $command remove_sub1 &&
+ test_superproject_content origin/remove_sub1 &&
+ test_git_directory_is_unchanged sub1 &&
+ test_submodule_content sub1 origin/add_sub1
+ )
+ '
+ # Replacing a submodule with files in a directory must fail as the
+ # submodule work tree isn't removed ...
+ if test "$KNOWN_FAILURE_NOFF_MERGE_ATTEMPTS_TO_MERGE_REMOVED_SUBMODULE_FILES" = 1
+ then
+ # Non fast-forward merges attempt to merge the former
+ # submodule files with the newly checked out ones in the
+ # directory of the same name while it shouldn't.
+ RESULT="failure"
+ else
+ RESULT="success"
+ fi
+ test_expect_$RESULT "$command: replace submodule with a directory must fail" '
+ prolog &&
+ reset_work_tree_to add_sub1 &&
+ (
+ cd submodule_update &&
+ git branch -t replace_sub1_with_directory origin/replace_sub1_with_directory &&
+ test_must_fail $command replace_sub1_with_directory &&
+ test_superproject_content origin/add_sub1 &&
+ test_submodule_content sub1 origin/add_sub1
+ )
+ '
+ # ... especially when it contains a .git directory.
+ test_expect_$RESULT "$command: replace submodule containing a .git directory with a directory must fail" '
+ prolog &&
+ reset_work_tree_to add_sub1 &&
+ (
+ cd submodule_update &&
+ git branch -t replace_sub1_with_directory origin/replace_sub1_with_directory &&
+ replace_gitfile_with_git_dir sub1 &&
+ test_must_fail $command replace_sub1_with_directory &&
+ test_superproject_content origin/add_sub1 &&
+ test_git_directory_is_unchanged sub1 &&
+ test_submodule_content sub1 origin/add_sub1
+ )
+ '
+ # Replacing it with a file must fail as it could throw away any local
+ # work tree changes ...
+ test_expect_failure "$command: replace submodule with a file must fail" '
+ prolog &&
+ reset_work_tree_to add_sub1 &&
+ (
+ cd submodule_update &&
+ git branch -t replace_sub1_with_file origin/replace_sub1_with_file &&
+ test_must_fail $command replace_sub1_with_file &&
+ test_superproject_content origin/add_sub1 &&
+ test_submodule_content sub1 origin/add_sub1
+ )
+ '
+ # ... or even destroy unpushed parts of submodule history if that
+ # still uses a .git directory.
+ test_expect_failure "$command: replace submodule containing a .git directory with a file must fail" '
+ prolog &&
+ reset_work_tree_to add_sub1 &&
+ (
+ cd submodule_update &&
+ git branch -t replace_sub1_with_file origin/replace_sub1_with_file &&
+ replace_gitfile_with_git_dir sub1 &&
+ test_must_fail $command replace_sub1_with_file &&
+ test_superproject_content origin/add_sub1 &&
+ test_git_directory_is_unchanged sub1 &&
+ test_submodule_content sub1 origin/add_sub1
+ )
+ '
+
+ ########################## Modified submodule #########################
+ # Updating a submodule sha1 doesn't update the submodule's work tree
+ if test "$KNOWN_FAILURE_CHERRY_PICK_SEES_EMPTY_COMMIT" = 1
+ then
+ # When cherry picking a SHA-1 update for an ignored submodule
+ # the commit incorrectly fails with "The previous cherry-pick
+ # is now empty, possibly due to conflict resolution."
+ RESULT="failure"
+ else
+ RESULT="success"
+ fi
+ test_expect_$RESULT "$command: modified submodule does not update submodule work tree" '
+ prolog &&
+ reset_work_tree_to add_sub1 &&
+ (
+ cd submodule_update &&
+ git branch -t modify_sub1 origin/modify_sub1 &&
+ $command modify_sub1 &&
+ test_superproject_content origin/modify_sub1 &&
+ test_submodule_content sub1 origin/add_sub1 &&
+ git submodule update &&
+ test_submodule_content sub1 origin/modify_sub1
+ )
+ '
+
+ # Updating a submodule to an invalid sha1 doesn't update the
+ # submodule's work tree, subsequent update will fail
+ test_expect_$RESULT "$command: modified submodule does not update submodule work tree to invalid commit" '
+ prolog &&
+ reset_work_tree_to add_sub1 &&
+ (
+ cd submodule_update &&
+ git branch -t invalid_sub1 origin/invalid_sub1 &&
+ $command invalid_sub1 &&
+ test_superproject_content origin/invalid_sub1 &&
+ test_submodule_content sub1 origin/add_sub1 &&
+ test_must_fail git submodule update &&
+ test_submodule_content sub1 origin/add_sub1
+ )
+ '
+ # Updating a submodule from an invalid sha1 doesn't update the
+ # submodule's work tree, subsequent update will succeed
+ test_expect_$RESULT "$command: modified submodule does not update submodule work tree from invalid commit" '
+ prolog &&
+ reset_work_tree_to invalid_sub1 &&
+ (
+ cd submodule_update &&
+ git branch -t valid_sub1 origin/valid_sub1 &&
+ $command valid_sub1 &&
+ test_superproject_content origin/valid_sub1 &&
+ test_dir_is_empty sub1 &&
+ git submodule update --init --recursive &&
+ test_submodule_content sub1 origin/valid_sub1
+ )
+ '
+}
+
+# Test that submodule contents are currently not updated when switching
+# between commits that change a submodule, but throwing away local changes in
+# the superproject is allowed.
+test_submodule_forced_switch () {
+ command="$1"
+ ######################### Appearing submodule #########################
+ # Switching to a commit letting a submodule appear creates empty dir ...
+ test_expect_success "$command: added submodule creates empty directory" '
+ prolog &&
+ reset_work_tree_to no_submodule &&
+ (
+ cd submodule_update &&
+ git branch -t add_sub1 origin/add_sub1 &&
+ $command add_sub1 &&
+ test_superproject_content origin/add_sub1 &&
+ test_dir_is_empty sub1 &&
+ git submodule update --init --recursive &&
+ test_submodule_content sub1 origin/add_sub1
+ )
+ '
+ # ... and doesn't care if it already exists ...
+ test_expect_success "$command: added submodule leaves existing empty directory alone" '
+ prolog &&
+ reset_work_tree_to no_submodule &&
+ (
+ cd submodule_update &&
+ git branch -t add_sub1 origin/add_sub1 &&
+ mkdir sub1 &&
+ $command add_sub1 &&
+ test_superproject_content origin/add_sub1 &&
+ test_dir_is_empty sub1 &&
+ git submodule update --init --recursive &&
+ test_submodule_content sub1 origin/add_sub1
+ )
+ '
+ # ... unless there is an untracked file in its place.
+ test_expect_success "$command: added submodule does remove untracked unignored file with same name when forced" '
+ prolog &&
+ reset_work_tree_to no_submodule &&
+ (
+ cd submodule_update &&
+ git branch -t add_sub1 origin/add_sub1 &&
+ >sub1 &&
+ $command add_sub1 &&
+ test_superproject_content origin/add_sub1 &&
+ test_dir_is_empty sub1
+ )
+ '
+ # Replacing a tracked file with a submodule produces an empty
+ # directory ...
+ test_expect_success "$command: replace tracked file with submodule creates empty directory" '
+ prolog &&
+ reset_work_tree_to replace_sub1_with_file &&
+ (
+ cd submodule_update &&
+ git branch -t replace_file_with_sub1 origin/replace_file_with_sub1 &&
+ $command replace_file_with_sub1 &&
+ test_superproject_content origin/replace_file_with_sub1 &&
+ test_dir_is_empty sub1 &&
+ git submodule update --init --recursive &&
+ test_submodule_content sub1 origin/replace_file_with_sub1
+ )
+ '
+ # ... as does removing a directory with tracked files with a
+ # submodule.
+ test_expect_success "$command: replace directory with submodule" '
+ prolog &&
+ reset_work_tree_to replace_sub1_with_directory &&
+ (
+ cd submodule_update &&
+ git branch -t replace_directory_with_sub1 origin/replace_directory_with_sub1 &&
+ $command replace_directory_with_sub1 &&
+ test_superproject_content origin/replace_directory_with_sub1 &&
+ test_dir_is_empty sub1 &&
+ git submodule update --init --recursive &&
+ test_submodule_content sub1 origin/replace_directory_with_sub1
+ )
+ '
+
+ ######################## Disappearing submodule #######################
+ # Removing a submodule doesn't remove its work tree ...
+ test_expect_success "$command: removed submodule leaves submodule directory and its contents in place" '
+ prolog &&
+ reset_work_tree_to add_sub1 &&
+ (
+ cd submodule_update &&
+ git branch -t remove_sub1 origin/remove_sub1 &&
+ $command remove_sub1 &&
+ test_superproject_content origin/remove_sub1 &&
+ test_submodule_content sub1 origin/add_sub1
+ )
+ '
+ # ... especially when it contains a .git directory.
+ test_expect_success "$command: removed submodule leaves submodule containing a .git directory alone" '
+ prolog &&
+ reset_work_tree_to add_sub1 &&
+ (
+ cd submodule_update &&
+ git branch -t remove_sub1 origin/remove_sub1 &&
+ replace_gitfile_with_git_dir sub1 &&
+ $command remove_sub1 &&
+ test_superproject_content origin/remove_sub1 &&
+ test_git_directory_is_unchanged sub1 &&
+ test_submodule_content sub1 origin/add_sub1
+ )
+ '
+ # Replacing a submodule with files in a directory must fail as the
+ # submodule work tree isn't removed ...
+ test_expect_failure "$command: replace submodule with a directory must fail" '
+ prolog &&
+ reset_work_tree_to add_sub1 &&
+ (
+ cd submodule_update &&
+ git branch -t replace_sub1_with_directory origin/replace_sub1_with_directory &&
+ test_must_fail $command replace_sub1_with_directory &&
+ test_superproject_content origin/add_sub1 &&
+ test_submodule_content sub1 origin/add_sub1
+ )
+ '
+ # ... especially when it contains a .git directory.
+ test_expect_failure "$command: replace submodule containing a .git directory with a directory must fail" '
+ prolog &&
+ reset_work_tree_to add_sub1 &&
+ (
+ cd submodule_update &&
+ git branch -t replace_sub1_with_directory origin/replace_sub1_with_directory &&
+ replace_gitfile_with_git_dir sub1 &&
+ test_must_fail $command replace_sub1_with_directory &&
+ test_superproject_content origin/add_sub1 &&
+ test_git_directory_is_unchanged sub1 &&
+ test_submodule_content sub1 origin/add_sub1
+ )
+ '
+ # Replacing it with a file must fail as it could throw away any local
+ # work tree changes ...
+ test_expect_failure "$command: replace submodule with a file must fail" '
+ prolog &&
+ reset_work_tree_to add_sub1 &&
+ (
+ cd submodule_update &&
+ git branch -t replace_sub1_with_file origin/replace_sub1_with_file &&
+ test_must_fail $command replace_sub1_with_file &&
+ test_superproject_content origin/add_sub1 &&
+ test_submodule_content sub1 origin/add_sub1
+ )
+ '
+ # ... or even destroy unpushed parts of submodule history if that
+ # still uses a .git directory.
+ test_expect_failure "$command: replace submodule containing a .git directory with a file must fail" '
+ prolog &&
+ reset_work_tree_to add_sub1 &&
+ (
+ cd submodule_update &&
+ git branch -t replace_sub1_with_file origin/replace_sub1_with_file &&
+ replace_gitfile_with_git_dir sub1 &&
+ test_must_fail $command replace_sub1_with_file &&
+ test_superproject_content origin/add_sub1 &&
+ test_git_directory_is_unchanged sub1 &&
+ test_submodule_content sub1 origin/add_sub1
+ )
+ '
+
+ ########################## Modified submodule #########################
+ # Updating a submodule sha1 doesn't update the submodule's work tree
+ test_expect_success "$command: modified submodule does not update submodule work tree" '
+ prolog &&
+ reset_work_tree_to add_sub1 &&
+ (
+ cd submodule_update &&
+ git branch -t modify_sub1 origin/modify_sub1 &&
+ $command modify_sub1 &&
+ test_superproject_content origin/modify_sub1 &&
+ test_submodule_content sub1 origin/add_sub1 &&
+ git submodule update &&
+ test_submodule_content sub1 origin/modify_sub1
+ )
+ '
+ # Updating a submodule to an invalid sha1 doesn't update the
+ # submodule's work tree, subsequent update will fail
+ test_expect_success "$command: modified submodule does not update submodule work tree to invalid commit" '
+ prolog &&
+ reset_work_tree_to add_sub1 &&
+ (
+ cd submodule_update &&
+ git branch -t invalid_sub1 origin/invalid_sub1 &&
+ $command invalid_sub1 &&
+ test_superproject_content origin/invalid_sub1 &&
+ test_submodule_content sub1 origin/add_sub1 &&
+ test_must_fail git submodule update &&
+ test_submodule_content sub1 origin/add_sub1
+ )
+ '
+ # Updating a submodule from an invalid sha1 doesn't update the
+ # submodule's work tree, subsequent update will succeed
+ test_expect_success "$command: modified submodule does not update submodule work tree from invalid commit" '
+ prolog &&
+ reset_work_tree_to invalid_sub1 &&
+ (
+ cd submodule_update &&
+ git branch -t valid_sub1 origin/valid_sub1 &&
+ $command valid_sub1 &&
+ test_superproject_content origin/valid_sub1 &&
+ test_dir_is_empty sub1 &&
+ git submodule update --init --recursive &&
+ test_submodule_content sub1 origin/valid_sub1
+ )
+ '
+}