merge(third_party/git): Merge squashed git subtree at v2.23.0 r/373

Merge commit '1b593e1ea4d2af0f6444d9a7788d5d99abd6fde5' as 'third_party/git'

1 files changed, 258 insertions, 0 deletions

diff --git a/third_party/git/t/t5537-fetch-shallow.sh b/third_party/git/t/t5537-fetch-shallow.sh
new file mode 100755
index 000000000000..66f0b64d3927
--- /dev/null
+++ b/third_party/git/t/t5537-fetch-shallow.sh
@@ -0,0 +1,258 @@
+#!/bin/sh
+
+test_description='fetch/clone from a shallow clone'
+
+. ./test-lib.sh
+
+commit() {
+	echo "$1" >tracked &&
+	git add tracked &&
+	git commit -m "$1"
+}
+
+test_expect_success 'setup' '
+	commit 1 &&
+	commit 2 &&
+	commit 3 &&
+	commit 4 &&
+	git config --global transfer.fsckObjects true
+'
+
+test_expect_success 'setup shallow clone' '
+	git clone --no-local --depth=2 .git shallow &&
+	git --git-dir=shallow/.git log --format=%s >actual &&
+	cat <<EOF >expect &&
+4
+3
+EOF
+	test_cmp expect actual
+'
+
+test_expect_success 'clone from shallow clone' '
+	git clone --no-local shallow shallow2 &&
+	(
+	cd shallow2 &&
+	git fsck &&
+	git log --format=%s >actual &&
+	cat <<EOF >expect &&
+4
+3
+EOF
+	test_cmp expect actual
+	)
+'
+
+test_expect_success 'fetch from shallow clone' '
+	(
+	cd shallow &&
+	commit 5
+	) &&
+	(
+	cd shallow2 &&
+	git fetch &&
+	git fsck &&
+	git log --format=%s origin/master >actual &&
+	cat <<EOF >expect &&
+5
+4
+3
+EOF
+	test_cmp expect actual
+	)
+'
+
+test_expect_success 'fetch --depth from shallow clone' '
+	(
+	cd shallow &&
+	commit 6
+	) &&
+	(
+	cd shallow2 &&
+	git fetch --depth=2 &&
+	git fsck &&
+	git log --format=%s origin/master >actual &&
+	cat <<EOF >expect &&
+6
+5
+EOF
+	test_cmp expect actual
+	)
+'
+
+test_expect_success 'fetch --unshallow from shallow clone' '
+	(
+	cd shallow2 &&
+	git fetch --unshallow &&
+	git fsck &&
+	git log --format=%s origin/master >actual &&
+	cat <<EOF >expect &&
+6
+5
+4
+3
+EOF
+	test_cmp expect actual
+	)
+'
+
+test_expect_success 'fetch something upstream has but hidden by clients shallow boundaries' '
+	# the blob "1" is available in .git but hidden by the
+	# shallow2/.git/shallow and it should be resent
+	! git --git-dir=shallow2/.git cat-file blob $(echo 1|git hash-object --stdin) >/dev/null &&
+	echo 1 >1.t &&
+	git add 1.t &&
+	git commit -m add-1-back &&
+	(
+	cd shallow2 &&
+	git fetch ../.git +refs/heads/master:refs/remotes/top/master &&
+	git fsck &&
+	git log --format=%s top/master >actual &&
+	cat <<EOF >expect &&
+add-1-back
+4
+3
+EOF
+	test_cmp expect actual
+	) &&
+	git --git-dir=shallow2/.git cat-file blob $(echo 1|git hash-object --stdin) >/dev/null
+
+'
+
+test_expect_success 'fetch that requires changes in .git/shallow is filtered' '
+	(
+	cd shallow &&
+	git checkout --orphan no-shallow &&
+	commit no-shallow
+	) &&
+	git init notshallow &&
+	(
+	cd notshallow &&
+	git fetch ../shallow/.git refs/heads/*:refs/remotes/shallow/*&&
+	git for-each-ref --format="%(refname)" >actual.refs &&
+	cat <<EOF >expect.refs &&
+refs/remotes/shallow/no-shallow
+EOF
+	test_cmp expect.refs actual.refs &&
+	git log --format=%s shallow/no-shallow >actual &&
+	cat <<EOF >expect &&
+no-shallow
+EOF
+	test_cmp expect actual
+	)
+'
+
+test_expect_success 'fetch --update-shallow' '
+	(
+	cd shallow &&
+	git checkout master &&
+	commit 7 &&
+	git tag -m foo heavy-tag HEAD^ &&
+	git tag light-tag HEAD^:tracked
+	) &&
+	(
+	cd notshallow &&
+	git fetch --update-shallow ../shallow/.git refs/heads/*:refs/remotes/shallow/* &&
+	git fsck &&
+	git for-each-ref --sort=refname --format="%(refname)" >actual.refs &&
+	cat <<EOF >expect.refs &&
+refs/remotes/shallow/master
+refs/remotes/shallow/no-shallow
+refs/tags/heavy-tag
+refs/tags/light-tag
+EOF
+	test_cmp expect.refs actual.refs &&
+	git log --format=%s shallow/master >actual &&
+	cat <<EOF >expect &&
+7
+6
+5
+4
+3
+EOF
+	test_cmp expect actual
+	)
+'
+
+test_expect_success POSIXPERM,SANITY 'shallow fetch from a read-only repo' '
+	cp -R .git read-only.git &&
+	test_when_finished "find read-only.git -type d -print | xargs chmod +w" &&
+	find read-only.git -print | xargs chmod -w &&
+	git clone --no-local --depth=2 read-only.git from-read-only &&
+	git --git-dir=from-read-only/.git log --format=%s >actual &&
+	cat >expect <<EOF &&
+add-1-back
+4
+EOF
+	test_cmp expect actual
+'
+
+test_expect_success '.git/shallow is edited by repack' '
+	git init shallow-server &&
+	test_commit -C shallow-server A &&
+	test_commit -C shallow-server B &&
+	git -C shallow-server checkout -b branch &&
+	test_commit -C shallow-server C &&
+	test_commit -C shallow-server E &&
+	test_commit -C shallow-server D &&
+	d="$(git -C shallow-server rev-parse --verify D^0)" &&
+	git -C shallow-server checkout master &&
+
+	git clone --depth=1 --no-tags --no-single-branch \
+		"file://$PWD/shallow-server" shallow-client &&
+
+	: now remove the branch and fetch with prune &&
+	git -C shallow-server branch -D branch &&
+	git -C shallow-client fetch --prune --depth=1 \
+		origin "+refs/heads/*:refs/remotes/origin/*" &&
+	git -C shallow-client repack -adfl &&
+	test_must_fail git -C shallow-client rev-parse --verify $d^0 &&
+	! grep $d shallow-client/.git/shallow &&
+
+	git -C shallow-server branch branch-orig $d &&
+	git -C shallow-client fetch --prune --depth=2 \
+		origin "+refs/heads/*:refs/remotes/origin/*"
+'
+
+. "$TEST_DIRECTORY"/lib-httpd.sh
+start_httpd
+
+REPO="$HTTPD_DOCUMENT_ROOT_PATH/repo"
+
+test_expect_success 'shallow fetches check connectivity before writing shallow file' '
+	rm -rf "$REPO" client &&
+
+	git init "$REPO" &&
+	test_commit -C "$REPO" one &&
+	test_commit -C "$REPO" two &&
+	test_commit -C "$REPO" three &&
+
+	git init client &&
+
+	# Use protocol v2 to ensure that shallow information is sent exactly
+	# once by the server, since we are planning to manipulate it.
+	git -C "$REPO" config protocol.version 2 &&
+	git -C client config protocol.version 2 &&
+
+	git -C client fetch --depth=2 "$HTTPD_URL/one_time_sed/repo" master:a_branch &&
+
+	# Craft a situation in which the server sends back an unshallow request
+	# with an empty packfile. This is done by refetching with a shorter
+	# depth (to ensure that the packfile is empty), and overwriting the
+	# shallow line in the response with the unshallow line we want.
+	printf "s/0034shallow %s/0036unshallow %s/" \
+	       "$(git -C "$REPO" rev-parse HEAD)" \
+	       "$(git -C "$REPO" rev-parse HEAD^)" \
+	       >"$HTTPD_ROOT_PATH/one-time-sed" &&
+	test_must_fail env GIT_TEST_SIDEBAND_ALL=0 git -C client \
+		fetch --depth=1 "$HTTPD_URL/one_time_sed/repo" \
+		master:a_branch &&
+
+	# Ensure that the one-time-sed script was used.
+	! test -e "$HTTPD_ROOT_PATH/one-time-sed" &&
+
+	# Ensure that the resulting repo is consistent, despite our failure to
+	# fetch.
+	git -C client fsck
+'
+
+test_done