1 files changed, 363 insertions, 0 deletions
diff --git a/t/t5604-clone-reference.sh b/t/t5604-clone-reference.sh
new file mode 100755
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+++ b/t/t5604-clone-reference.sh
@@ -0,0 +1,363 @@
+#!/bin/sh
+#
+# Copyright (C) 2006 Martin Waitz <tali@admingilde.org>
+#
+
+test_description='test clone --reference'
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+. ./test-lib.sh
+
+base_dir=$(pwd)
+
+U=$base_dir/UPLOAD_LOG
+
+# create a commit in repo $1 with name $2
+commit_in () {
+	(
+		cd "$1" &&
+		echo "$2" >"$2" &&
+		git add "$2" &&
+		git commit -m "$2"
+	)
+}
+
+# check that there are $2 loose objects in repo $1
+test_objcount () {
+	echo "$2" >expect &&
+	git -C "$1" count-objects >actual.raw &&
+	cut -d' ' -f1 <actual.raw >actual &&
+	test_cmp expect actual
+}
+
+test_expect_success 'preparing first repository' '
+	test_create_repo A &&
+	commit_in A file1
+'
+
+test_expect_success 'preparing second repository' '
+	git clone A B &&
+	commit_in B file2 &&
+	git -C B repack -ad &&
+	git -C B prune
+'
+
+test_expect_success 'cloning with reference (-l -s)' '
+	git clone -l -s --reference B A C
+'
+
+test_expect_success 'existence of info/alternates' '
+	test_line_count = 2 C/.git/objects/info/alternates
+'
+
+test_expect_success 'pulling from reference' '
+	git -C C pull ../B main
+'
+
+test_expect_success 'that reference gets used' '
+	test_objcount C 0
+'
+
+test_expect_success 'cloning with reference (no -l -s)' '
+	GIT_TRACE_PACKET=$U.D git clone --reference B "file://$(pwd)/A" D
+'
+
+test_expect_success 'fetched no objects' '
+	test -s "$U.D" &&
+	! grep " want" "$U.D"
+'
+
+test_expect_success 'existence of info/alternates' '
+	test_line_count = 1 D/.git/objects/info/alternates
+'
+
+test_expect_success 'pulling from reference' '
+	git -C D pull ../B main
+'
+
+test_expect_success 'that reference gets used' '
+	test_objcount D 0
+'
+
+test_expect_success 'updating origin' '
+	commit_in A file3 &&
+	git -C A repack -ad &&
+	git -C A prune
+'
+
+test_expect_success 'pulling changes from origin' '
+	git -C C pull --no-rebase origin
+'
+
+# the 2 local objects are commit and tree from the merge
+test_expect_success 'that alternate to origin gets used' '
+	test_objcount C 2
+'
+
+test_expect_success 'pulling changes from origin' '
+	git -C D pull --no-rebase origin
+'
+
+# the 5 local objects are expected; file3 blob, commit in A to add it
+# and its tree, and 2 are our tree and the merge commit.
+test_expect_success 'check objects expected to exist locally' '
+	test_objcount D 5
+'
+
+test_expect_success 'preparing alternate repository #1' '
+	test_create_repo F &&
+	commit_in F file1
+'
+
+test_expect_success 'cloning alternate repo #2 and adding changes to repo #1' '
+	git clone F G &&
+	commit_in F file2
+'
+
+test_expect_success 'cloning alternate repo #1, using #2 as reference' '
+	git clone --reference G F H
+'
+
+test_expect_success 'cloning with reference being subset of source (-l -s)' '
+	git clone -l -s --reference A B E
+'
+
+test_expect_success 'cloning with multiple references drops duplicates' '
+	git clone -s --reference B --reference A --reference B A dups &&
+	test_line_count = 2 dups/.git/objects/info/alternates
+'
+
+test_expect_success 'clone with reference from a tagged repository' '
+	(
+		cd A && git tag -a -m tagged HEAD
+	) &&
+	git clone --reference=A A I
+'
+
+test_expect_success 'prepare branched repository' '
+	git clone A J &&
+	(
+		cd J &&
+		git checkout -b other main^ &&
+		echo other >otherfile &&
+		git add otherfile &&
+		git commit -m other &&
+		git checkout main
+	)
+'
+
+test_expect_success 'fetch with incomplete alternates' '
+	git init K &&
+	echo "$base_dir/A/.git/objects" >K/.git/objects/info/alternates &&
+	(
+		cd K &&
+		git remote add J "file://$base_dir/J" &&
+		GIT_TRACE_PACKET=$U.K git fetch J
+	) &&
+	main_object=$(cd A && git for-each-ref --format="%(objectname)" refs/heads/main) &&
+	test -s "$U.K" &&
+	! grep " want $main_object" "$U.K" &&
+	tag_object=$(cd A && git for-each-ref --format="%(objectname)" refs/tags/HEAD) &&
+	! grep " want $tag_object" "$U.K"
+'
+
+test_expect_success 'clone using repo with gitfile as a reference' '
+	git clone --separate-git-dir=L A M &&
+	git clone --reference=M A N &&
+	echo "$base_dir/L/objects" >expected &&
+	test_cmp expected "$base_dir/N/.git/objects/info/alternates"
+'
+
+test_expect_success 'clone using repo pointed at by gitfile as reference' '
+	git clone --reference=M/.git A O &&
+	echo "$base_dir/L/objects" >expected &&
+	test_cmp expected "$base_dir/O/.git/objects/info/alternates"
+'
+
+test_expect_success 'clone and dissociate from reference' '
+	git init P &&
+	(
+		cd P && test_commit one
+	) &&
+	git clone P Q &&
+	(
+		cd Q && test_commit two
+	) &&
+	git clone --no-local --reference=P Q R &&
+	git clone --no-local --reference=P --dissociate Q S &&
+	# removing the reference P would corrupt R but not S
+	rm -fr P &&
+	test_must_fail git -C R fsck &&
+	git -C S fsck
+'
+test_expect_success 'clone, dissociate from partial reference and repack' '
+	rm -fr P Q R &&
+	git init P &&
+	(
+		cd P &&
+		test_commit one &&
+		git repack &&
+		test_commit two &&
+		git repack
+	) &&
+	git clone --bare P Q &&
+	(
+		cd P &&
+		git checkout -b second &&
+		test_commit three &&
+		git repack
+	) &&
+	git clone --bare --dissociate --reference=P Q R &&
+	ls R/objects/pack/*.pack >packs.txt &&
+	test_line_count = 1 packs.txt
+'
+
+test_expect_success 'clone, dissociate from alternates' '
+	rm -fr A B C &&
+	test_create_repo A &&
+	commit_in A file1 &&
+	git clone --reference=A A B &&
+	test_line_count = 1 B/.git/objects/info/alternates &&
+	git clone --local --dissociate B C &&
+	! test -f C/.git/objects/info/alternates &&
+	( cd C && git fsck )
+'
+
+test_expect_success 'setup repo with garbage in objects/*' '
+	git init S &&
+	(
+		cd S &&
+		test_commit A &&
+
+		cd .git/objects &&
+		>.some-hidden-file &&
+		>some-file &&
+		mkdir .some-hidden-dir &&
+		>.some-hidden-dir/some-file &&
+		>.some-hidden-dir/.some-dot-file &&
+		mkdir some-dir &&
+		>some-dir/some-file &&
+		>some-dir/.some-dot-file
+	)
+'
+
+test_expect_success 'clone a repo with garbage in objects/*' '
+	for option in --local --no-hardlinks --shared --dissociate
+	do
+		git clone $option S S$option || return 1 &&
+		git -C S$option fsck || return 1
+	done &&
+	find S-* -name "*some*" | sort >actual &&
+	cat >expected <<-EOF &&
+	S--dissociate/.git/objects/.some-hidden-dir
+	S--dissociate/.git/objects/.some-hidden-dir/.some-dot-file
+	S--dissociate/.git/objects/.some-hidden-dir/some-file
+	S--dissociate/.git/objects/.some-hidden-file
+	S--dissociate/.git/objects/some-dir
+	S--dissociate/.git/objects/some-dir/.some-dot-file
+	S--dissociate/.git/objects/some-dir/some-file
+	S--dissociate/.git/objects/some-file
+	S--local/.git/objects/.some-hidden-dir
+	S--local/.git/objects/.some-hidden-dir/.some-dot-file
+	S--local/.git/objects/.some-hidden-dir/some-file
+	S--local/.git/objects/.some-hidden-file
+	S--local/.git/objects/some-dir
+	S--local/.git/objects/some-dir/.some-dot-file
+	S--local/.git/objects/some-dir/some-file
+	S--local/.git/objects/some-file
+	S--no-hardlinks/.git/objects/.some-hidden-dir
+	S--no-hardlinks/.git/objects/.some-hidden-dir/.some-dot-file
+	S--no-hardlinks/.git/objects/.some-hidden-dir/some-file
+	S--no-hardlinks/.git/objects/.some-hidden-file
+	S--no-hardlinks/.git/objects/some-dir
+	S--no-hardlinks/.git/objects/some-dir/.some-dot-file
+	S--no-hardlinks/.git/objects/some-dir/some-file
+	S--no-hardlinks/.git/objects/some-file
+	EOF
+	test_cmp expected actual
+'
+
+test_expect_success SYMLINKS 'setup repo with manually symlinked or unknown files at objects/' '
+	git init T &&
+	(
+		cd T &&
+		git config gc.auto 0 &&
+		test_commit A &&
+		git gc &&
+		test_commit B &&
+
+		cd .git/objects &&
+		mv pack packs &&
+		ln -s packs pack &&
+		find ?? -type d >loose-dirs &&
+		last_loose=$(tail -n 1 loose-dirs) &&
+		mv $last_loose a-loose-dir &&
+		ln -s a-loose-dir $last_loose &&
+		first_loose=$(head -n 1 loose-dirs) &&
+		rm -f loose-dirs &&
+
+		cd $first_loose &&
+		obj=$(ls *) &&
+		mv $obj ../an-object &&
+		ln -s ../an-object $obj &&
+
+		cd ../ &&
+		echo unknown_content >unknown_file
+	) &&
+	git -C T fsck &&
+	git -C T rev-list --all --objects >T.objects
+'
+
+
+test_expect_success SYMLINKS 'clone repo with symlinked or unknown files at objects/' '
+	# None of these options work when cloning locally, since T has
+	# symlinks in its `$GIT_DIR/objects` directory
+	for option in --local --no-hardlinks --dissociate
+	do
+		test_must_fail git clone $option T T$option 2>err || return 1 &&
+		test_i18ngrep "symlink.*exists" err || return 1
+	done &&
+
+	# But `--shared` clones should still work, even when specifying
+	# a local path *and* that repository has symlinks present in its
+	# `$GIT_DIR/objects` directory.
+	git clone --shared T T--shared &&
+	git -C T--shared fsck &&
+	git -C T--shared rev-list --all --objects >T--shared.objects &&
+	test_cmp T.objects T--shared.objects &&
+	(
+		cd T--shared/.git/objects &&
+		find . -type f | sort >../../../T--shared.objects-files.raw &&
+		find . -type l | sort >../../../T--shared.objects-symlinks.raw
+	) &&
+
+	for raw in $(ls T*.raw)
+	do
+		sed -e "s!/../!/Y/!; s![0-9a-f]\{38,\}!Z!" -e "/commit-graph/d" \
+		    -e "/multi-pack-index/d" -e "/rev/d" <$raw >$raw.de-sha-1 &&
+		sort $raw.de-sha-1 >$raw.de-sha || return 1
+	done &&
+
+	echo ./info/alternates >expected-files &&
+	test_cmp expected-files T--shared.objects-files.raw &&
+	test_must_be_empty T--shared.objects-symlinks.raw
+'
+
+test_expect_success SYMLINKS 'clone repo with symlinked objects directory' '
+	test_when_finished "rm -fr sensitive malicious" &&
+
+	mkdir -p sensitive &&
+	echo "secret" >sensitive/file &&
+
+	git init malicious &&
+	rm -fr malicious/.git/objects &&
+	ln -s "$(pwd)/sensitive" ./malicious/.git/objects &&
+
+	test_must_fail git clone --local malicious clone 2>err &&
+
+	test_path_is_missing clone &&
+	grep "failed to start iterator over" err
+'
+
+test_done