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t7611-merge-abort.sh
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t7611-merge-abort.sh
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#!/bin/sh
test_description='test aborting in-progress merges
Set up repo with conflicting and non-conflicting branches:
There are three files foo/bar/baz, and the following graph illustrates the
content of these files in each commit:
# foo/bar/baz --- foo/bar/bazz <-- master
# \
# --- foo/barf/bazf <-- conflict_branch
# \
# --- foo/bart/baz <-- clean_branch
Next, test git merge --abort with the following variables:
- before/after successful merge (should fail when not in merge context)
- with/without conflicts
- clean/dirty index before merge
- clean/dirty worktree before merge
- dirty index before merge matches contents on remote branch
- changed/unchanged worktree after merge
- changed/unchanged index after merge
'
. ./test-lib.sh
test_expect_success 'setup' '
# Create the above repo
echo foo > foo &&
echo bar > bar &&
echo baz > baz &&
git add foo bar baz &&
git commit -m initial &&
echo bazz > baz &&
git commit -a -m "second" &&
git checkout -b conflict_branch HEAD^ &&
echo barf > bar &&
echo bazf > baz &&
git commit -a -m "conflict" &&
git checkout -b clean_branch HEAD^ &&
echo bart > bar &&
git commit -a -m "clean" &&
git checkout master
'
pre_merge_head="$(git rev-parse HEAD)"
test_expect_success 'fails without MERGE_HEAD (unstarted merge)' '
test_must_fail git merge --abort 2>output &&
test_i18ngrep MERGE_HEAD output
'
test_expect_success 'fails without MERGE_HEAD (unstarted merge): .git/MERGE_HEAD sanity' '
test ! -f .git/MERGE_HEAD &&
test "$pre_merge_head" = "$(git rev-parse HEAD)"
'
test_expect_success 'fails without MERGE_HEAD (completed merge)' '
git merge clean_branch &&
test ! -f .git/MERGE_HEAD &&
# Merge successfully completed
post_merge_head="$(git rev-parse HEAD)" &&
test_must_fail git merge --abort 2>output &&
test_i18ngrep MERGE_HEAD output
'
test_expect_success 'fails without MERGE_HEAD (completed merge): .git/MERGE_HEAD sanity' '
test ! -f .git/MERGE_HEAD &&
test "$post_merge_head" = "$(git rev-parse HEAD)"
'
test_expect_success 'Forget previous merge' '
git reset --hard "$pre_merge_head"
'
test_expect_success 'Abort after --no-commit' '
# Redo merge, but stop before creating merge commit
git merge --no-commit clean_branch &&
test -f .git/MERGE_HEAD &&
# Abort non-conflicting merge
git merge --abort &&
test ! -f .git/MERGE_HEAD &&
test "$pre_merge_head" = "$(git rev-parse HEAD)" &&
test -z "$(git diff)" &&
test -z "$(git diff --staged)"
'
test_expect_success 'Abort after conflicts' '
# Create conflicting merge
test_must_fail git merge conflict_branch &&
test -f .git/MERGE_HEAD &&
# Abort conflicting merge
git merge --abort &&
test ! -f .git/MERGE_HEAD &&
test "$pre_merge_head" = "$(git rev-parse HEAD)" &&
test -z "$(git diff)" &&
test -z "$(git diff --staged)"
'
test_expect_success 'Clean merge with dirty index fails' '
echo xyzzy >> foo &&
git add foo &&
git diff --staged > expect &&
test_must_fail git merge clean_branch &&
test ! -f .git/MERGE_HEAD &&
test "$pre_merge_head" = "$(git rev-parse HEAD)" &&
test -z "$(git diff)" &&
git diff --staged > actual &&
test_cmp expect actual
'
test_expect_success 'Conflicting merge with dirty index fails' '
test_must_fail git merge conflict_branch &&
test ! -f .git/MERGE_HEAD &&
test "$pre_merge_head" = "$(git rev-parse HEAD)" &&
test -z "$(git diff)" &&
git diff --staged > actual &&
test_cmp expect actual
'
test_expect_success 'Reset index (but preserve worktree changes)' '
git reset "$pre_merge_head" &&
git diff > actual &&
test_cmp expect actual
'
test_expect_success 'Abort clean merge with non-conflicting dirty worktree' '
git merge --no-commit clean_branch &&
test -f .git/MERGE_HEAD &&
# Abort merge
git merge --abort &&
test ! -f .git/MERGE_HEAD &&
test "$pre_merge_head" = "$(git rev-parse HEAD)" &&
test -z "$(git diff --staged)" &&
git diff > actual &&
test_cmp expect actual
'
test_expect_success 'Abort conflicting merge with non-conflicting dirty worktree' '
test_must_fail git merge conflict_branch &&
test -f .git/MERGE_HEAD &&
# Abort merge
git merge --abort &&
test ! -f .git/MERGE_HEAD &&
test "$pre_merge_head" = "$(git rev-parse HEAD)" &&
test -z "$(git diff --staged)" &&
git diff > actual &&
test_cmp expect actual
'
test_expect_success 'Reset worktree changes' '
git reset --hard "$pre_merge_head"
'
test_expect_success 'Fail clean merge with conflicting dirty worktree' '
echo xyzzy >> bar &&
git diff > expect &&
test_must_fail git merge --no-commit clean_branch &&
test ! -f .git/MERGE_HEAD &&
test "$pre_merge_head" = "$(git rev-parse HEAD)" &&
test -z "$(git diff --staged)" &&
git diff > actual &&
test_cmp expect actual
'
test_expect_success 'Fail conflicting merge with conflicting dirty worktree' '
test_must_fail git merge conflict_branch &&
test ! -f .git/MERGE_HEAD &&
test "$pre_merge_head" = "$(git rev-parse HEAD)" &&
test -z "$(git diff --staged)" &&
git diff > actual &&
test_cmp expect actual
'
test_expect_success 'Reset worktree changes' '
git reset --hard "$pre_merge_head"
'
test_expect_success 'Fail clean merge with matching dirty worktree' '
echo bart > bar &&
git diff > expect &&
test_must_fail git merge --no-commit clean_branch &&
test ! -f .git/MERGE_HEAD &&
test "$pre_merge_head" = "$(git rev-parse HEAD)" &&
test -z "$(git diff --staged)" &&
git diff > actual &&
test_cmp expect actual
'
test_expect_success 'Abort clean merge with matching dirty index' '
git add bar &&
git diff --staged > expect &&
git merge --no-commit clean_branch &&
test -f .git/MERGE_HEAD &&
### When aborting the merge, git will discard all staged changes,
### including those that were staged pre-merge. In other words,
### --abort will LOSE any staged changes (the staged changes that
### are lost must match the merge result, or the merge would not
### have been allowed to start). Change expectations accordingly:
rm expect &&
touch expect &&
# Abort merge
git merge --abort &&
test ! -f .git/MERGE_HEAD &&
test "$pre_merge_head" = "$(git rev-parse HEAD)" &&
git diff --staged > actual &&
test_cmp expect actual &&
test -z "$(git diff)"
'
test_expect_success 'Reset worktree changes' '
git reset --hard "$pre_merge_head"
'
test_expect_success 'Fail conflicting merge with matching dirty worktree' '
echo barf > bar &&
git diff > expect &&
test_must_fail git merge conflict_branch &&
test ! -f .git/MERGE_HEAD &&
test "$pre_merge_head" = "$(git rev-parse HEAD)" &&
test -z "$(git diff --staged)" &&
git diff > actual &&
test_cmp expect actual
'
test_expect_success 'Abort conflicting merge with matching dirty index' '
git add bar &&
git diff --staged > expect &&
test_must_fail git merge conflict_branch &&
test -f .git/MERGE_HEAD &&
### When aborting the merge, git will discard all staged changes,
### including those that were staged pre-merge. In other words,
### --abort will LOSE any staged changes (the staged changes that
### are lost must match the merge result, or the merge would not
### have been allowed to start). Change expectations accordingly:
rm expect &&
touch expect &&
# Abort merge
git merge --abort &&
test ! -f .git/MERGE_HEAD &&
test "$pre_merge_head" = "$(git rev-parse HEAD)" &&
git diff --staged > actual &&
test_cmp expect actual &&
test -z "$(git diff)"
'
test_expect_success 'Reset worktree changes' '
git reset --hard "$pre_merge_head"
'
test_expect_success 'Abort merge with pre- and post-merge worktree changes' '
# Pre-merge worktree changes
echo xyzzy > foo &&
echo barf > bar &&
git add bar &&
git diff > expect &&
git diff --staged > expect-staged &&
# Perform merge
test_must_fail git merge conflict_branch &&
test -f .git/MERGE_HEAD &&
# Post-merge worktree changes
echo yzxxz > foo &&
echo blech > baz &&
### When aborting the merge, git will discard staged changes (bar)
### and unmerged changes (baz). Other changes that are neither
### staged nor marked as unmerged (foo), will be preserved. For
### these changed, git cannot tell pre-merge changes apart from
### post-merge changes, so the post-merge changes will be
### preserved. Change expectations accordingly:
git diff -- foo > expect &&
rm expect-staged &&
touch expect-staged &&
# Abort merge
git merge --abort &&
test ! -f .git/MERGE_HEAD &&
test "$pre_merge_head" = "$(git rev-parse HEAD)" &&
git diff > actual &&
test_cmp expect actual &&
git diff --staged > actual-staged &&
test_cmp expect-staged actual-staged
'
test_expect_success 'Reset worktree changes' '
git reset --hard "$pre_merge_head"
'
test_expect_success 'Abort merge with pre- and post-merge index changes' '
# Pre-merge worktree changes
echo xyzzy > foo &&
echo barf > bar &&
git add bar &&
git diff > expect &&
git diff --staged > expect-staged &&
# Perform merge
test_must_fail git merge conflict_branch &&
test -f .git/MERGE_HEAD &&
# Post-merge worktree changes
echo yzxxz > foo &&
echo blech > baz &&
git add foo bar &&
### When aborting the merge, git will discard all staged changes
### (foo, bar and baz), and no changes will be preserved. Whether
### the changes were staged pre- or post-merge does not matter
### (except for not preventing starting the merge).
### Change expectations accordingly:
rm expect expect-staged &&
touch expect &&
touch expect-staged &&
# Abort merge
git merge --abort &&
test ! -f .git/MERGE_HEAD &&
test "$pre_merge_head" = "$(git rev-parse HEAD)" &&
git diff > actual &&
test_cmp expect actual &&
git diff --staged > actual-staged &&
test_cmp expect-staged actual-staged
'
test_done