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-rwxr-xr-xt/t2024-checkout-dwim.sh347
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diff --git a/t/t2024-checkout-dwim.sh b/t/t2024-checkout-dwim.sh
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+#!/bin/sh
+
+test_description='checkout <branch>
+
+Ensures that checkout on an unborn branch does what the user expects'
+
+. ./test-lib.sh
+
+# Is the current branch "refs/heads/$1"?
+test_branch () {
+ printf "%s\n" "refs/heads/$1" >expect.HEAD &&
+ git symbolic-ref HEAD >actual.HEAD &&
+ test_cmp expect.HEAD actual.HEAD
+}
+
+# Is branch "refs/heads/$1" set to pull from "$2/$3"?
+test_branch_upstream () {
+ printf "%s\n" "$2" "refs/heads/$3" >expect.upstream &&
+ {
+ git config "branch.$1.remote" &&
+ git config "branch.$1.merge"
+ } >actual.upstream &&
+ test_cmp expect.upstream actual.upstream
+}
+
+status_uno_is_clean () {
+ git status -uno --porcelain >status.actual &&
+ test_must_be_empty status.actual
+}
+
+test_expect_success 'setup' '
+ test_commit my_main &&
+ git init repo_a &&
+ (
+ cd repo_a &&
+ test_commit a_main &&
+ git checkout -b foo &&
+ test_commit a_foo &&
+ git checkout -b bar &&
+ test_commit a_bar &&
+ git checkout -b ambiguous_branch_and_file &&
+ test_commit a_ambiguous_branch_and_file
+ ) &&
+ git init repo_b &&
+ (
+ cd repo_b &&
+ test_commit b_main &&
+ git checkout -b foo &&
+ test_commit b_foo &&
+ git checkout -b baz &&
+ test_commit b_baz &&
+ git checkout -b ambiguous_branch_and_file &&
+ test_commit b_ambiguous_branch_and_file
+ ) &&
+ git remote add repo_a repo_a &&
+ git remote add repo_b repo_b &&
+ git config remote.repo_b.fetch \
+ "+refs/heads/*:refs/remotes/other_b/*" &&
+ git fetch --all
+'
+
+test_expect_success 'checkout of non-existing branch fails' '
+ git checkout -B main &&
+ test_might_fail git branch -D xyzzy &&
+
+ test_must_fail git checkout xyzzy &&
+ status_uno_is_clean &&
+ test_must_fail git rev-parse --verify refs/heads/xyzzy &&
+ test_branch main
+'
+
+test_expect_success 'checkout of branch from multiple remotes fails #1' '
+ git checkout -B main &&
+ test_might_fail git branch -D foo &&
+
+ test_must_fail git checkout foo &&
+ status_uno_is_clean &&
+ test_must_fail git rev-parse --verify refs/heads/foo &&
+ test_branch main
+'
+
+test_expect_success 'when arg matches multiple remotes, do not fallback to interpreting as pathspec' '
+ # create a file with name matching remote branch name
+ git checkout -b t_ambiguous_branch_and_file &&
+ >ambiguous_branch_and_file &&
+ git add ambiguous_branch_and_file &&
+ git commit -m "ambiguous_branch_and_file" &&
+
+ # modify file to verify that it will not be touched by checkout
+ test_when_finished "git checkout -- ambiguous_branch_and_file" &&
+ echo "file contents" >ambiguous_branch_and_file &&
+ cp ambiguous_branch_and_file expect &&
+
+ test_must_fail git checkout ambiguous_branch_and_file 2>err &&
+
+ test_i18ngrep "matched multiple (2) remote tracking branches" err &&
+
+ # file must not be altered
+ test_cmp expect ambiguous_branch_and_file
+'
+
+test_expect_success 'checkout of branch from multiple remotes fails with advice' '
+ git checkout -B main &&
+ test_might_fail git branch -D foo &&
+ test_must_fail git checkout foo 2>stderr &&
+ test_branch main &&
+ status_uno_is_clean &&
+ test_i18ngrep "^hint: " stderr &&
+ test_must_fail git -c advice.checkoutAmbiguousRemoteBranchName=false \
+ checkout foo 2>stderr &&
+ test_branch main &&
+ status_uno_is_clean &&
+ test_i18ngrep ! "^hint: " stderr
+'
+
+test_expect_success PERL 'checkout -p with multiple remotes does not print advice' '
+ git checkout -B main &&
+ test_might_fail git branch -D foo &&
+
+ git checkout -p foo 2>stderr &&
+ test_i18ngrep ! "^hint: " stderr &&
+ status_uno_is_clean
+'
+
+test_expect_success 'checkout of branch from multiple remotes succeeds with checkout.defaultRemote #1' '
+ git checkout -B main &&
+ status_uno_is_clean &&
+ test_might_fail git branch -D foo &&
+
+ git -c checkout.defaultRemote=repo_a checkout foo &&
+ status_uno_is_clean &&
+ test_branch foo &&
+ test_cmp_rev remotes/repo_a/foo HEAD &&
+ test_branch_upstream foo repo_a foo
+'
+
+test_expect_success 'checkout of branch from a single remote succeeds #1' '
+ git checkout -B main &&
+ test_might_fail git branch -D bar &&
+
+ git checkout bar &&
+ status_uno_is_clean &&
+ test_branch bar &&
+ test_cmp_rev remotes/repo_a/bar HEAD &&
+ test_branch_upstream bar repo_a bar
+'
+
+test_expect_success 'checkout of branch from a single remote succeeds #2' '
+ git checkout -B main &&
+ test_might_fail git branch -D baz &&
+
+ git checkout baz &&
+ status_uno_is_clean &&
+ test_branch baz &&
+ test_cmp_rev remotes/other_b/baz HEAD &&
+ test_branch_upstream baz repo_b baz
+'
+
+test_expect_success '--no-guess suppresses branch auto-vivification' '
+ git checkout -B main &&
+ status_uno_is_clean &&
+ test_might_fail git branch -D bar &&
+
+ test_must_fail git checkout --no-guess bar &&
+ test_must_fail git rev-parse --verify refs/heads/bar &&
+ test_branch main
+'
+
+test_expect_success 'checkout.guess = false suppresses branch auto-vivification' '
+ git checkout -B main &&
+ status_uno_is_clean &&
+ test_might_fail git branch -D bar &&
+
+ test_config checkout.guess false &&
+ test_must_fail git checkout bar &&
+ test_must_fail git rev-parse --verify refs/heads/bar &&
+ test_branch main
+'
+
+test_expect_success 'setup more remotes with unconventional refspecs' '
+ git checkout -B main &&
+ status_uno_is_clean &&
+ git init repo_c &&
+ (
+ cd repo_c &&
+ test_commit c_main &&
+ git checkout -b bar &&
+ test_commit c_bar &&
+ git checkout -b spam &&
+ test_commit c_spam
+ ) &&
+ git init repo_d &&
+ (
+ cd repo_d &&
+ test_commit d_main &&
+ git checkout -b baz &&
+ test_commit d_baz &&
+ git checkout -b eggs &&
+ test_commit d_eggs
+ ) &&
+ git remote add repo_c repo_c &&
+ git config remote.repo_c.fetch \
+ "+refs/heads/*:refs/remotes/extra_dir/repo_c/extra_dir/*" &&
+ git remote add repo_d repo_d &&
+ git config remote.repo_d.fetch \
+ "+refs/heads/*:refs/repo_d/*" &&
+ git fetch --all
+'
+
+test_expect_success 'checkout of branch from multiple remotes fails #2' '
+ git checkout -B main &&
+ status_uno_is_clean &&
+ test_might_fail git branch -D bar &&
+
+ test_must_fail git checkout bar &&
+ status_uno_is_clean &&
+ test_must_fail git rev-parse --verify refs/heads/bar &&
+ test_branch main
+'
+
+test_expect_success 'checkout of branch from multiple remotes fails #3' '
+ git checkout -B main &&
+ status_uno_is_clean &&
+ test_might_fail git branch -D baz &&
+
+ test_must_fail git checkout baz &&
+ status_uno_is_clean &&
+ test_must_fail git rev-parse --verify refs/heads/baz &&
+ test_branch main
+'
+
+test_expect_success 'checkout of branch from a single remote succeeds #3' '
+ git checkout -B main &&
+ status_uno_is_clean &&
+ test_might_fail git branch -D spam &&
+
+ git checkout spam &&
+ status_uno_is_clean &&
+ test_branch spam &&
+ test_cmp_rev refs/remotes/extra_dir/repo_c/extra_dir/spam HEAD &&
+ test_branch_upstream spam repo_c spam
+'
+
+test_expect_success 'checkout of branch from a single remote succeeds #4' '
+ git checkout -B main &&
+ status_uno_is_clean &&
+ test_might_fail git branch -D eggs &&
+
+ git checkout eggs &&
+ status_uno_is_clean &&
+ test_branch eggs &&
+ test_cmp_rev refs/repo_d/eggs HEAD &&
+ test_branch_upstream eggs repo_d eggs
+'
+
+test_expect_success 'checkout of branch with a file having the same name fails' '
+ git checkout -B main &&
+ status_uno_is_clean &&
+ test_might_fail git branch -D spam &&
+
+ >spam &&
+ test_must_fail git checkout spam &&
+ status_uno_is_clean &&
+ test_must_fail git rev-parse --verify refs/heads/spam &&
+ test_branch main
+'
+
+test_expect_success 'checkout of branch with a file in subdir having the same name fails' '
+ git checkout -B main &&
+ status_uno_is_clean &&
+ test_might_fail git branch -D spam &&
+
+ >spam &&
+ mkdir sub &&
+ mv spam sub/spam &&
+ test_must_fail git -C sub checkout spam &&
+ status_uno_is_clean &&
+ test_must_fail git rev-parse --verify refs/heads/spam &&
+ test_branch main
+'
+
+test_expect_success 'checkout <branch> -- succeeds, even if a file with the same name exists' '
+ git checkout -B main &&
+ status_uno_is_clean &&
+ test_might_fail git branch -D spam &&
+
+ >spam &&
+ git checkout spam -- &&
+ status_uno_is_clean &&
+ test_branch spam &&
+ test_cmp_rev refs/remotes/extra_dir/repo_c/extra_dir/spam HEAD &&
+ test_branch_upstream spam repo_c spam
+'
+
+test_expect_success 'loosely defined local base branch is reported correctly' '
+
+ git checkout main &&
+ status_uno_is_clean &&
+ git branch strict &&
+ git branch loose &&
+ git commit --allow-empty -m "a bit more" &&
+
+ test_config branch.strict.remote . &&
+ test_config branch.loose.remote . &&
+ test_config branch.strict.merge refs/heads/main &&
+ test_config branch.loose.merge main &&
+
+ git checkout strict | sed -e "s/strict/BRANCHNAME/g" >expect &&
+ status_uno_is_clean &&
+ git checkout loose | sed -e "s/loose/BRANCHNAME/g" >actual &&
+ status_uno_is_clean &&
+
+ test_cmp expect actual
+'
+
+test_expect_success 'reject when arg could be part of dwim branch' '
+ git remote add foo file://non-existent-place &&
+ git update-ref refs/remotes/foo/dwim-arg HEAD &&
+ echo foo >dwim-arg &&
+ git add dwim-arg &&
+ echo bar >dwim-arg &&
+ test_must_fail git checkout dwim-arg &&
+ test_must_fail git rev-parse refs/heads/dwim-arg -- &&
+ grep bar dwim-arg
+'
+
+test_expect_success 'disambiguate dwim branch and checkout path (1)' '
+ git update-ref refs/remotes/foo/dwim-arg1 HEAD &&
+ echo foo >dwim-arg1 &&
+ git add dwim-arg1 &&
+ echo bar >dwim-arg1 &&
+ git checkout -- dwim-arg1 &&
+ test_must_fail git rev-parse refs/heads/dwim-arg1 -- &&
+ grep foo dwim-arg1
+'
+
+test_expect_success 'disambiguate dwim branch and checkout path (2)' '
+ git update-ref refs/remotes/foo/dwim-arg2 HEAD &&
+ echo foo >dwim-arg2 &&
+ git add dwim-arg2 &&
+ echo bar >dwim-arg2 &&
+ git checkout dwim-arg2 -- &&
+ git rev-parse refs/heads/dwim-arg2 -- &&
+ grep bar dwim-arg2
+'
+
+test_done