merge(3p/git): Merge git subtree at v2.29.2 r/1890

This also bumps the stable nixpkgs to 20.09 as of 2020-11-21, because
there is some breakage in the git build related to the netrc
credentials helper which someone has taken care of in nixpkgs.

The stable channel is not used for anything other than git, so this
should be fine.

Change-Id: I3575a19dab09e1e9556cf8231d717de9890484fb

1 files changed, 93 insertions, 9 deletions

diff --git a/third_party/git/t/t3400-rebase.sh b/third_party/git/t/t3400-rebase.sh
index 80b23fd326..40d2975995 100755
--- a/third_party/git/t/t3400-rebase.sh
+++ b/third_party/git/t/t3400-rebase.sh
@@ -64,7 +64,7 @@ test_expect_success 'rebase sets ORIG_HEAD to pre-rebase state' '
 	pre="$(git rev-parse --verify HEAD)" &&
 	git rebase master &&
 	test_cmp_rev "$pre" ORIG_HEAD &&
-	! test_cmp_rev "$pre" HEAD
+	test_cmp_rev ! "$pre" HEAD
 '
 
 test_expect_success 'rebase, with <onto> and <upstream> specified as :/quuxery' '
@@ -143,11 +143,11 @@ test_expect_success 'setup: recover' '
 
 test_expect_success 'Show verbose error when HEAD could not be detached' '
 	>B &&
+	test_when_finished "rm -f B" &&
 	test_must_fail git rebase topic 2>output.err >output.out &&
 	test_i18ngrep "The following untracked working tree files would be overwritten by checkout:" output.err &&
 	test_i18ngrep B output.err
 '
-rm -f B
 
 test_expect_success 'fail when upstream arg is missing and not on branch' '
 	git checkout topic &&
@@ -159,19 +159,43 @@ test_expect_success 'fail when upstream arg is missing and not configured' '
 	test_must_fail git rebase
 '
 
-test_expect_success 'default to common base in @{upstream}s reflog if no upstream arg' '
+test_expect_success 'rebase works with format.useAutoBase' '
+	test_config format.useAutoBase true &&
+	git checkout topic &&
+	git rebase master
+'
+
+test_expect_success 'default to common base in @{upstream}s reflog if no upstream arg (--merge)' '
 	git checkout -b default-base master &&
 	git checkout -b default topic &&
 	git config branch.default.remote . &&
 	git config branch.default.merge refs/heads/default-base &&
-	git rebase &&
+	git rebase --merge &&
 	git rev-parse --verify default-base >expect &&
 	git rev-parse default~1 >actual &&
 	test_cmp expect actual &&
 	git checkout default-base &&
 	git reset --hard HEAD^ &&
 	git checkout default &&
-	git rebase &&
+	git rebase --merge &&
+	git rev-parse --verify default-base >expect &&
+	git rev-parse default~1 >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'default to common base in @{upstream}s reflog if no upstream arg (--apply)' '
+	git checkout -B default-base master &&
+	git checkout -B default topic &&
+	git config branch.default.remote . &&
+	git config branch.default.merge refs/heads/default-base &&
+	git rebase --apply &&
+	git rev-parse --verify default-base >expect &&
+	git rev-parse default~1 >actual &&
+	test_cmp expect actual &&
+	git checkout default-base &&
+	git reset --hard HEAD^ &&
+	git checkout default &&
+	git rebase --apply &&
 	git rev-parse --verify default-base >expect &&
 	git rev-parse default~1 >actual &&
 	test_cmp expect actual
@@ -200,9 +224,15 @@ test_expect_success 'cherry-picked commits and fork-point work together' '
 	test_cmp expect D
 '
 
-test_expect_success 'rebase -q is quiet' '
+test_expect_success 'rebase --apply -q is quiet' '
 	git checkout -b quiet topic &&
-	git rebase -q master >output.out 2>&1 &&
+	git rebase --apply -q master >output.out 2>&1 &&
+	test_must_be_empty output.out
+'
+
+test_expect_success 'rebase --merge -q is quiet' '
+	git checkout -B quiet topic &&
+	git rebase --merge -q master >output.out 2>&1 &&
 	test_must_be_empty output.out
 '
 
@@ -285,7 +315,7 @@ EOF
 	test_cmp From_.msg out
 '
 
-test_expect_success 'rebase --am and --show-current-patch' '
+test_expect_success 'rebase --apply and --show-current-patch' '
 	test_create_repo conflict-apply &&
 	(
 		cd conflict-apply &&
@@ -295,12 +325,48 @@ test_expect_success 'rebase --am and --show-current-patch' '
 		echo two >>init.t &&
 		git commit -a -m two &&
 		git tag two &&
-		test_must_fail git rebase --onto init HEAD^ &&
+		test_must_fail git rebase --apply -f --onto init HEAD^ &&
 		GIT_TRACE=1 git rebase --show-current-patch >/dev/null 2>stderr &&
 		grep "show.*$(git rev-parse two)" stderr
 	)
 '
 
+test_expect_success 'rebase --apply and .gitattributes' '
+	test_create_repo attributes &&
+	(
+		cd attributes &&
+		test_commit init &&
+		git config filter.test.clean "sed -e '\''s/smudged/clean/g'\''" &&
+		git config filter.test.smudge "sed -e '\''s/clean/smudged/g'\''" &&
+
+		test_commit second &&
+		git checkout -b test HEAD^ &&
+
+		echo "*.txt filter=test" >.gitattributes &&
+		git add .gitattributes &&
+		test_commit third &&
+
+		echo "This text is smudged." >a.txt &&
+		git add a.txt &&
+		test_commit fourth &&
+
+		git checkout -b removal HEAD^ &&
+		git rm .gitattributes &&
+		git add -u &&
+		test_commit fifth &&
+		git cherry-pick test &&
+
+		git checkout test &&
+		git rebase master &&
+		grep "smudged" a.txt &&
+
+		git checkout removal &&
+		git reset --hard &&
+		git rebase master &&
+		grep "clean" a.txt
+	)
+'
+
 test_expect_success 'rebase--merge.sh and --show-current-patch' '
 	test_create_repo conflict-merge &&
 	(
@@ -335,4 +401,22 @@ test_expect_success 'rebase -c rebase.useBuiltin=false warning' '
 	test_must_be_empty err
 '
 
+test_expect_success 'switch to branch checked out here' '
+	git checkout master &&
+	git rebase master master
+'
+
+test_expect_success 'switch to branch not checked out' '
+	git checkout master &&
+	git branch other &&
+	git rebase master other
+'
+
+test_expect_success 'refuse to switch to branch checked out elsewhere' '
+	git checkout master &&
+	git worktree add wt &&
+	test_must_fail git -C wt rebase master master 2>err &&
+	test_i18ngrep "already checked out" err
+'
+
 test_done