t/t5616-partial-clone.sh - jrn/git - Git at Google

 #!/bin/sh

 test_description='git partial clone'

 . ./test-lib.sh

 # create a normal "src" repo where we can later create new commits.
 # expect_1.oids will contain a list of the OIDs of all blobs.
 test_expect_success 'setup normal src repo' '
 	echo "{print \$1}" >print_1.awk &&
 	echo "{print \$2}" >print_2.awk &&

 	git init src &&
 	for n in 1 2 3 4
 	do
 		echo "This is file: $n" > src/file.$n.txt
 		git -C src add file.$n.txt
 		git -C src commit -m "file $n"
 		git -C src ls-files -s file.$n.txt >>temp
 	done &&
 	awk -f print_2.awk <temp | sort >expect_1.oids &&
 	test_line_count = 4 expect_1.oids
 '

 # bare clone "src" giving "srv.bare" for use as our server.
 test_expect_success 'setup bare clone for server' '
 	git clone --bare "file://$(pwd)/src" srv.bare &&
 	git -C srv.bare config --local uploadpack.allowfilter 1 &&
 	git -C srv.bare config --local uploadpack.allowanysha1inwant 1
 '

 # do basic partial clone from "srv.bare"
 # confirm we are missing all of the known blobs.
 # confirm partial clone was registered in the local config.
 test_expect_success 'do partial clone 1' '
 	git clone --no-checkout --filter=blob:none "file://$(pwd)/srv.bare" pc1 &&

 	git -C pc1 rev-list --quiet --objects --missing=print HEAD >revs &&
 	awk -f print_1.awk revs |
 	sed "s/?//" |
 	sort >observed.oids &&

 	test_cmp expect_1.oids observed.oids &&
 	test "$(git -C pc1 config --local core.repositoryformatversion)" = "1" &&
 	test "$(git -C pc1 config --local extensions.partialclone)" = "origin" &&
 	test "$(git -C pc1 config --local core.partialclonefilter)" = "blob:none"
 '

 # checkout master to force dynamic object fetch of blobs at HEAD.
 test_expect_success 'verify checkout with dynamic object fetch' '
 	git -C pc1 rev-list --quiet --objects --missing=print HEAD >observed &&
 	test_line_count = 4 observed &&
 	git -C pc1 checkout master &&
 	git -C pc1 rev-list --quiet --objects --missing=print HEAD >observed &&
 	test_line_count = 0 observed
 '

 # create new commits in "src" repo to establish a blame history on file.1.txt
 # and push to "srv.bare".
 test_expect_success 'push new commits to server' '
 	git -C src remote add srv "file://$(pwd)/srv.bare" &&
 	for x in a b c d e
 	do
 		echo "Mod file.1.txt $x" >>src/file.1.txt
 		git -C src add file.1.txt
 		git -C src commit -m "mod $x"
 	done &&
 	git -C src blame master -- file.1.txt >expect.blame &&
 	git -C src push -u srv master
 '

 # (partial) fetch in the partial clone repo from the promisor remote.
 # verify that fetch inherited the filter-spec from the config and DOES NOT
 # have the new blobs.
 test_expect_success 'partial fetch inherits filter settings' '
 	git -C pc1 fetch origin &&
 	git -C pc1 rev-list --quiet --objects --missing=print \
 		master..origin/master >observed &&
 	test_line_count = 5 observed
 '

 # force dynamic object fetch using diff.
 # we should only get 1 new blob (for the file in origin/master).
 test_expect_success 'verify diff causes dynamic object fetch' '
 	git -C pc1 diff master..origin/master -- file.1.txt &&
 	git -C pc1 rev-list --quiet --objects --missing=print \
 		 master..origin/master >observed &&
 	test_line_count = 4 observed
 '

 # force full dynamic object fetch of the file's history using blame.
 # we should get the intermediate blobs for the file.
 test_expect_success 'verify blame causes dynamic object fetch' '
 	git -C pc1 blame origin/master -- file.1.txt >observed.blame &&
 	test_cmp expect.blame observed.blame &&
 	git -C pc1 rev-list --quiet --objects --missing=print \
 		master..origin/master >observed &&
 	test_line_count = 0 observed
 '

 # create new commits in "src" repo to establish a history on file.2.txt
 # and push to "srv.bare".
 test_expect_success 'push new commits to server for file.2.txt' '
 	for x in a b c d e f
 	do
 		echo "Mod file.2.txt $x" >>src/file.2.txt
 		git -C src add file.2.txt
 		git -C src commit -m "mod $x"
 	done &&
 	git -C src push -u srv master
 '

 # Do FULL fetch by disabling inherited filter-spec using --no-filter.
 # Verify we have all the new blobs.
 test_expect_success 'override inherited filter-spec using --no-filter' '
 	git -C pc1 fetch --no-filter origin &&
 	git -C pc1 rev-list --quiet --objects --missing=print \
 		master..origin/master >observed &&
 	test_line_count = 0 observed
 '

 # create new commits in "src" repo to establish a history on file.3.txt
 # and push to "srv.bare".
 test_expect_success 'push new commits to server for file.3.txt' '
 	for x in a b c d e f
 	do
 		echo "Mod file.3.txt $x" >>src/file.3.txt
 		git -C src add file.3.txt
 		git -C src commit -m "mod $x"
 	done &&
 	git -C src push -u srv master
 '

 # Do a partial fetch and then try to manually fetch the missing objects.
 # This can be used as the basis of a pre-command hook to bulk fetch objects
 # perhaps combined with a command in dry-run mode.
 test_expect_success 'manual prefetch of missing objects' '
 	git -C pc1 fetch --filter=blob:none origin &&

 	git -C pc1 rev-list --quiet --objects --missing=print \
 		 master..origin/master >revs &&
 	awk -f print_1.awk revs |
 	sed "s/?//" |
 	sort >observed.oids &&

 	test_line_count = 6 observed.oids &&
 	git -C pc1 fetch-pack --stdin "file://$(pwd)/srv.bare" <observed.oids &&

 	git -C pc1 rev-list --quiet --objects --missing=print \
 		master..origin/master >revs &&
 	awk -f print_1.awk revs |
 	sed "s/?//" |
 	sort >observed.oids &&

 	test_line_count = 0 observed.oids
 '

 test_expect_success 'partial clone with transfer.fsckobjects=1 uses index-pack --fsck-objects' '
 	git init src &&
 	test_commit -C src x &&
 	test_config -C src uploadpack.allowfilter 1 &&
 	test_config -C src uploadpack.allowanysha1inwant 1 &&

 	GIT_TRACE="$(pwd)/trace" git -c transfer.fsckobjects=1 \
 		clone --filter="blob:none" "file://$(pwd)/src" dst &&
 	grep "git index-pack.*--fsck-objects" trace
 '

 test_expect_success 'use fsck before and after manually fetching a missing subtree' '
 	# push new commit so server has a subtree
 	mkdir src/dir &&
 	echo "in dir" >src/dir/file.txt &&
 	git -C src add dir/file.txt &&
 	git -C src commit -m "file in dir" &&
 	git -C src push -u srv master &&
 	SUBTREE=$(git -C src rev-parse HEAD:dir) &&

 	rm -rf dst &&
 	git clone --no-checkout --filter=tree:0 "file://$(pwd)/srv.bare" dst &&
 	git -C dst fsck &&

 	# Make sure we only have commits, and all trees and blobs are missing.
 	git -C dst rev-list --missing=allow-any --objects master \
 		>fetched_objects &&
 	awk -f print_1.awk fetched_objects |
 	xargs -n1 git -C dst cat-file -t >fetched_types &&

 	sort -u fetched_types >unique_types.observed &&
 	echo commit >unique_types.expected &&
 	test_cmp unique_types.expected unique_types.observed &&

 	# Auto-fetch a tree with cat-file.
 	git -C dst cat-file -p $SUBTREE >tree_contents &&
 	grep file.txt tree_contents &&

 	# fsck still works after an auto-fetch of a tree.
 	git -C dst fsck &&

 	# Auto-fetch all remaining trees and blobs with --missing=error
 	git -C dst rev-list --missing=error --objects master >fetched_objects &&
 	test_line_count = 70 fetched_objects &&

 	awk -f print_1.awk fetched_objects |
 	xargs -n1 git -C dst cat-file -t >fetched_types &&

 	sort -u fetched_types >unique_types.observed &&
 	test_write_lines blob commit tree >unique_types.expected &&
 	test_cmp unique_types.expected unique_types.observed
 '

 test_expect_success 'partial clone fetches blobs pointed to by refs even if normally filtered out' '
 	rm -rf src dst &&
 	git init src &&
 	test_commit -C src x &&
 	test_config -C src uploadpack.allowfilter 1 &&
 	test_config -C src uploadpack.allowanysha1inwant 1 &&

 	# Create a tag pointing to a blob.
 	BLOB=$(echo blob-contents | git -C src hash-object --stdin -w) &&
 	git -C src tag myblob "$BLOB" &&

 	git clone --filter="blob:none" "file://$(pwd)/src" dst 2>err &&
 	! grep "does not point to a valid object" err &&
 	git -C dst fsck
 '

 test_expect_success 'fetch what is specified on CLI even if already promised' '
 	rm -rf src dst.git &&
 	git init src &&
 	test_commit -C src foo &&
 	test_config -C src uploadpack.allowfilter 1 &&
 	test_config -C src uploadpack.allowanysha1inwant 1 &&

 	git hash-object --stdin <src/foo.t >blob &&

 	git clone --bare --filter=blob:none "file://$(pwd)/src" dst.git &&
 	git -C dst.git rev-list --objects --quiet --missing=print HEAD >missing_before &&
 	grep "?$(cat blob)" missing_before &&
 	git -C dst.git fetch origin $(cat blob) &&
 	git -C dst.git rev-list --objects --quiet --missing=print HEAD >missing_after &&
 	! grep "?$(cat blob)" missing_after
 '

 . "$TEST_DIRECTORY"/lib-httpd.sh
 start_httpd

 # Converts bytes into a form suitable for inclusion in a sed command. For
 # example, "printf 'ab\r\n' | hex_unpack" results in '\x61\x62\x0d\x0a'.
 sed_escape () {
 	perl -e '$/ = undef; $input = <>; print unpack("H2" x length($input), $input)' |
 		sed 's/\(..\)/\\x\1/g'
 }

 test_expect_success 'upon cloning, check that all refs point to objects' '
 	SERVER="$HTTPD_DOCUMENT_ROOT_PATH/server" &&
 	rm -rf "$SERVER" repo &&
 	test_create_repo "$SERVER" &&
 	test_commit -C "$SERVER" foo &&
 	test_config -C "$SERVER" uploadpack.allowfilter 1 &&
 	test_config -C "$SERVER" uploadpack.allowanysha1inwant 1 &&

 	# Create a tag pointing to a blob.
 	BLOB=$(echo blob-contents | git -C "$SERVER" hash-object --stdin -w) &&
 	git -C "$SERVER" tag myblob "$BLOB" &&

 	# Craft a packfile not including that blob.
 	git -C "$SERVER" rev-parse HEAD |
 	git -C "$SERVER" pack-objects --stdout >incomplete.pack &&

 	# Replace the existing packfile with the crafted one. The protocol
 	# requires that the packfile be sent in sideband 1, hence the extra
 	# \x01 byte at the beginning.
 	printf "1,/packfile/!c %04x\\\\x01%s0000" \
 		"$(($(wc -c <incomplete.pack) + 5))" \
 		"$(sed_escape <incomplete.pack)" \
 		>"$HTTPD_ROOT_PATH/one-time-sed" &&

 	# Use protocol v2 because the sed command looks for the "packfile"
 	# section header.
 	test_config -C "$SERVER" protocol.version 2 &&
 	test_must_fail git -c protocol.version=2 clone \
 		--filter=blob:none $HTTPD_URL/one_time_sed/server repo 2>err &&

 	test_i18ngrep "did not send all necessary objects" err &&

 	# Ensure that the one-time-sed script was used.
 	! test -e "$HTTPD_ROOT_PATH/one-time-sed"
 '

 test_expect_success 'when partial cloning, tolerate server not sending target of tag' '
 	SERVER="$HTTPD_DOCUMENT_ROOT_PATH/server" &&
 	rm -rf "$SERVER" repo &&
 	test_create_repo "$SERVER" &&
 	test_commit -C "$SERVER" foo &&
 	test_config -C "$SERVER" uploadpack.allowfilter 1 &&
 	test_config -C "$SERVER" uploadpack.allowanysha1inwant 1 &&

 	# Create an annotated tag pointing to a blob.
 	BLOB=$(echo blob-contents | git -C "$SERVER" hash-object --stdin -w) &&
 	git -C "$SERVER" tag -m message -a myblob "$BLOB" &&

 	# Craft a packfile including the tag, but not the blob it points to.
 	# Also, omit objects referenced from HEAD in order to force a second
 	# fetch (to fetch missing objects) upon the automatic checkout that
 	# happens after a clone.
 	printf "%s\n%s\n--not\n%s\n%s\n" \
 		$(git -C "$SERVER" rev-parse HEAD) \
 		$(git -C "$SERVER" rev-parse myblob) \
 		$(git -C "$SERVER" rev-parse HEAD^{tree}) \
 		$(git -C "$SERVER" rev-parse myblob^{blob}) |
 		git -C "$SERVER" pack-objects --thin --stdout >incomplete.pack &&

 	# Replace the existing packfile with the crafted one. The protocol
 	# requires that the packfile be sent in sideband 1, hence the extra
 	# \x01 byte at the beginning.
 	printf "1,/packfile/!c %04x\\\\x01%s0000" \
 		"$(($(wc -c <incomplete.pack) + 5))" \
 		"$(sed_escape <incomplete.pack)" \
 		>"$HTTPD_ROOT_PATH/one-time-sed" &&

 	# Use protocol v2 because the sed command looks for the "packfile"
 	# section header.
 	test_config -C "$SERVER" protocol.version 2 &&

 	# Exercise to make sure it works.
 	git -c protocol.version=2 clone \
 		--filter=blob:none $HTTPD_URL/one_time_sed/server repo 2> err &&
 	! grep "missing object referenced by" err &&

 	# Ensure that the one-time-sed script was used.
 	! test -e "$HTTPD_ROOT_PATH/one-time-sed"
 '

 stop_httpd

 test_done
	#!/bin/sh

	test_description='git partial clone'

	. ./test-lib.sh

	# create a normal "src" repo where we can later create new commits.
	# expect_1.oids will contain a list of the OIDs of all blobs.
	test_expect_success 'setup normal src repo' '
	echo "{print \$1}" >print_1.awk &&
	echo "{print \$2}" >print_2.awk &&

	git init src &&
	for n in 1 2 3 4
	do
	echo "This is file: $n" > src/file.$n.txt
	git -C src add file.$n.txt
	git -C src commit -m "file $n"
	git -C src ls-files -s file.$n.txt >>temp
	done &&
	awk -f print_2.awk <temp \| sort >expect_1.oids &&
	test_line_count = 4 expect_1.oids
	'

	# bare clone "src" giving "srv.bare" for use as our server.
	test_expect_success 'setup bare clone for server' '
	git clone --bare "file://$(pwd)/src" srv.bare &&
	git -C srv.bare config --local uploadpack.allowfilter 1 &&
	git -C srv.bare config --local uploadpack.allowanysha1inwant 1
	'

	# do basic partial clone from "srv.bare"
	# confirm we are missing all of the known blobs.
	# confirm partial clone was registered in the local config.
	test_expect_success 'do partial clone 1' '
	git clone --no-checkout --filter=blob:none "file://$(pwd)/srv.bare" pc1 &&

	git -C pc1 rev-list --quiet --objects --missing=print HEAD >revs &&
	awk -f print_1.awk revs \|
	sed "s/?//" \|
	sort >observed.oids &&

	test_cmp expect_1.oids observed.oids &&
	test "$(git -C pc1 config --local core.repositoryformatversion)" = "1" &&
	test "$(git -C pc1 config --local extensions.partialclone)" = "origin" &&
	test "$(git -C pc1 config --local core.partialclonefilter)" = "blob:none"
	'

	# checkout master to force dynamic object fetch of blobs at HEAD.
	test_expect_success 'verify checkout with dynamic object fetch' '
	git -C pc1 rev-list --quiet --objects --missing=print HEAD >observed &&
	test_line_count = 4 observed &&
	git -C pc1 checkout master &&
	git -C pc1 rev-list --quiet --objects --missing=print HEAD >observed &&
	test_line_count = 0 observed
	'

	# create new commits in "src" repo to establish a blame history on file.1.txt
	# and push to "srv.bare".
	test_expect_success 'push new commits to server' '
	git -C src remote add srv "file://$(pwd)/srv.bare" &&
	for x in a b c d e
	do
	echo "Mod file.1.txt $x" >>src/file.1.txt
	git -C src add file.1.txt
	git -C src commit -m "mod $x"
	done &&
	git -C src blame master -- file.1.txt >expect.blame &&
	git -C src push -u srv master
	'

	# (partial) fetch in the partial clone repo from the promisor remote.
	# verify that fetch inherited the filter-spec from the config and DOES NOT
	# have the new blobs.
	test_expect_success 'partial fetch inherits filter settings' '
	git -C pc1 fetch origin &&
	git -C pc1 rev-list --quiet --objects --missing=print \
	master..origin/master >observed &&
	test_line_count = 5 observed
	'

	# force dynamic object fetch using diff.
	# we should only get 1 new blob (for the file in origin/master).
	test_expect_success 'verify diff causes dynamic object fetch' '
	git -C pc1 diff master..origin/master -- file.1.txt &&
	git -C pc1 rev-list --quiet --objects --missing=print \
	master..origin/master >observed &&
	test_line_count = 4 observed
	'

	# force full dynamic object fetch of the file's history using blame.
	# we should get the intermediate blobs for the file.
	test_expect_success 'verify blame causes dynamic object fetch' '
	git -C pc1 blame origin/master -- file.1.txt >observed.blame &&
	test_cmp expect.blame observed.blame &&
	git -C pc1 rev-list --quiet --objects --missing=print \
	master..origin/master >observed &&
	test_line_count = 0 observed
	'

	# create new commits in "src" repo to establish a history on file.2.txt
	# and push to "srv.bare".
	test_expect_success 'push new commits to server for file.2.txt' '
	for x in a b c d e f
	do
	echo "Mod file.2.txt $x" >>src/file.2.txt
	git -C src add file.2.txt
	git -C src commit -m "mod $x"
	done &&
	git -C src push -u srv master
	'

	# Do FULL fetch by disabling inherited filter-spec using --no-filter.
	# Verify we have all the new blobs.
	test_expect_success 'override inherited filter-spec using --no-filter' '
	git -C pc1 fetch --no-filter origin &&
	git -C pc1 rev-list --quiet --objects --missing=print \
	master..origin/master >observed &&
	test_line_count = 0 observed
	'

	# create new commits in "src" repo to establish a history on file.3.txt
	# and push to "srv.bare".
	test_expect_success 'push new commits to server for file.3.txt' '
	for x in a b c d e f
	do
	echo "Mod file.3.txt $x" >>src/file.3.txt
	git -C src add file.3.txt
	git -C src commit -m "mod $x"
	done &&
	git -C src push -u srv master
	'

	# Do a partial fetch and then try to manually fetch the missing objects.
	# This can be used as the basis of a pre-command hook to bulk fetch objects
	# perhaps combined with a command in dry-run mode.
	test_expect_success 'manual prefetch of missing objects' '
	git -C pc1 fetch --filter=blob:none origin &&

	git -C pc1 rev-list --quiet --objects --missing=print \
	master..origin/master >revs &&
	awk -f print_1.awk revs \|
	sed "s/?//" \|
	sort >observed.oids &&

	test_line_count = 6 observed.oids &&
	git -C pc1 fetch-pack --stdin "file://$(pwd)/srv.bare" <observed.oids &&

	git -C pc1 rev-list --quiet --objects --missing=print \
	master..origin/master >revs &&
	awk -f print_1.awk revs \|
	sed "s/?//" \|
	sort >observed.oids &&

	test_line_count = 0 observed.oids
	'

	test_expect_success 'partial clone with transfer.fsckobjects=1 uses index-pack --fsck-objects' '
	git init src &&
	test_commit -C src x &&
	test_config -C src uploadpack.allowfilter 1 &&
	test_config -C src uploadpack.allowanysha1inwant 1 &&

	GIT_TRACE="$(pwd)/trace" git -c transfer.fsckobjects=1 \
	clone --filter="blob:none" "file://$(pwd)/src" dst &&
	grep "git index-pack.*--fsck-objects" trace
	'

	test_expect_success 'use fsck before and after manually fetching a missing subtree' '
	# push new commit so server has a subtree
	mkdir src/dir &&
	echo "in dir" >src/dir/file.txt &&
	git -C src add dir/file.txt &&
	git -C src commit -m "file in dir" &&
	git -C src push -u srv master &&
	SUBTREE=$(git -C src rev-parse HEAD:dir) &&

	rm -rf dst &&
	git clone --no-checkout --filter=tree:0 "file://$(pwd)/srv.bare" dst &&
	git -C dst fsck &&

	# Make sure we only have commits, and all trees and blobs are missing.
	git -C dst rev-list --missing=allow-any --objects master \
	>fetched_objects &&
	awk -f print_1.awk fetched_objects \|
	xargs -n1 git -C dst cat-file -t >fetched_types &&

	sort -u fetched_types >unique_types.observed &&
	echo commit >unique_types.expected &&
	test_cmp unique_types.expected unique_types.observed &&

	# Auto-fetch a tree with cat-file.
	git -C dst cat-file -p $SUBTREE >tree_contents &&
	grep file.txt tree_contents &&

	# fsck still works after an auto-fetch of a tree.
	git -C dst fsck &&

	# Auto-fetch all remaining trees and blobs with --missing=error
	git -C dst rev-list --missing=error --objects master >fetched_objects &&
	test_line_count = 70 fetched_objects &&

	awk -f print_1.awk fetched_objects \|
	xargs -n1 git -C dst cat-file -t >fetched_types &&

	sort -u fetched_types >unique_types.observed &&
	test_write_lines blob commit tree >unique_types.expected &&
	test_cmp unique_types.expected unique_types.observed
	'

	test_expect_success 'partial clone fetches blobs pointed to by refs even if normally filtered out' '
	rm -rf src dst &&
	git init src &&
	test_commit -C src x &&
	test_config -C src uploadpack.allowfilter 1 &&
	test_config -C src uploadpack.allowanysha1inwant 1 &&

	# Create a tag pointing to a blob.
	BLOB=$(echo blob-contents \| git -C src hash-object --stdin -w) &&
	git -C src tag myblob "$BLOB" &&

	git clone --filter="blob:none" "file://$(pwd)/src" dst 2>err &&
	! grep "does not point to a valid object" err &&
	git -C dst fsck
	'

	test_expect_success 'fetch what is specified on CLI even if already promised' '
	rm -rf src dst.git &&
	git init src &&
	test_commit -C src foo &&
	test_config -C src uploadpack.allowfilter 1 &&
	test_config -C src uploadpack.allowanysha1inwant 1 &&

	git hash-object --stdin <src/foo.t >blob &&

	git clone --bare --filter=blob:none "file://$(pwd)/src" dst.git &&
	git -C dst.git rev-list --objects --quiet --missing=print HEAD >missing_before &&
	grep "?$(cat blob)" missing_before &&
	git -C dst.git fetch origin $(cat blob) &&
	git -C dst.git rev-list --objects --quiet --missing=print HEAD >missing_after &&
	! grep "?$(cat blob)" missing_after
	'

	. "$TEST_DIRECTORY"/lib-httpd.sh
	start_httpd

	# Converts bytes into a form suitable for inclusion in a sed command. For
	# example, "printf 'ab\r\n' \| hex_unpack" results in '\x61\x62\x0d\x0a'.
	sed_escape () {
	perl -e '$/ = undef; $input = <>; print unpack("H2" x length($input), $input)' \|
	sed 's/\(..\)/\\x\1/g'
	}

	test_expect_success 'upon cloning, check that all refs point to objects' '
	SERVER="$HTTPD_DOCUMENT_ROOT_PATH/server" &&
	rm -rf "$SERVER" repo &&
	test_create_repo "$SERVER" &&
	test_commit -C "$SERVER" foo &&
	test_config -C "$SERVER" uploadpack.allowfilter 1 &&
	test_config -C "$SERVER" uploadpack.allowanysha1inwant 1 &&

	# Create a tag pointing to a blob.
	BLOB=$(echo blob-contents \| git -C "$SERVER" hash-object --stdin -w) &&
	git -C "$SERVER" tag myblob "$BLOB" &&

	# Craft a packfile not including that blob.
	git -C "$SERVER" rev-parse HEAD \|
	git -C "$SERVER" pack-objects --stdout >incomplete.pack &&

	# Replace the existing packfile with the crafted one. The protocol
	# requires that the packfile be sent in sideband 1, hence the extra
	# \x01 byte at the beginning.
	printf "1,/packfile/!c %04x\\\\x01%s0000" \
	"$(($(wc -c <incomplete.pack) + 5))" \
	"$(sed_escape <incomplete.pack)" \
	>"$HTTPD_ROOT_PATH/one-time-sed" &&

	# Use protocol v2 because the sed command looks for the "packfile"
	# section header.
	test_config -C "$SERVER" protocol.version 2 &&
	test_must_fail git -c protocol.version=2 clone \
	--filter=blob:none $HTTPD_URL/one_time_sed/server repo 2>err &&

	test_i18ngrep "did not send all necessary objects" err &&

	# Ensure that the one-time-sed script was used.
	! test -e "$HTTPD_ROOT_PATH/one-time-sed"
	'

	test_expect_success 'when partial cloning, tolerate server not sending target of tag' '
	SERVER="$HTTPD_DOCUMENT_ROOT_PATH/server" &&
	rm -rf "$SERVER" repo &&
	test_create_repo "$SERVER" &&
	test_commit -C "$SERVER" foo &&
	test_config -C "$SERVER" uploadpack.allowfilter 1 &&
	test_config -C "$SERVER" uploadpack.allowanysha1inwant 1 &&

	# Create an annotated tag pointing to a blob.
	BLOB=$(echo blob-contents \| git -C "$SERVER" hash-object --stdin -w) &&
	git -C "$SERVER" tag -m message -a myblob "$BLOB" &&

	# Craft a packfile including the tag, but not the blob it points to.
	# Also, omit objects referenced from HEAD in order to force a second
	# fetch (to fetch missing objects) upon the automatic checkout that
	# happens after a clone.
	printf "%s\n%s\n--not\n%s\n%s\n" \
	$(git -C "$SERVER" rev-parse HEAD) \
	$(git -C "$SERVER" rev-parse myblob) \
	$(git -C "$SERVER" rev-parse HEAD^{tree}) \
	$(git -C "$SERVER" rev-parse myblob^{blob}) \|
	git -C "$SERVER" pack-objects --thin --stdout >incomplete.pack &&

	# Replace the existing packfile with the crafted one. The protocol
	# requires that the packfile be sent in sideband 1, hence the extra
	# \x01 byte at the beginning.
	printf "1,/packfile/!c %04x\\\\x01%s0000" \
	"$(($(wc -c <incomplete.pack) + 5))" \
	"$(sed_escape <incomplete.pack)" \
	>"$HTTPD_ROOT_PATH/one-time-sed" &&

	# Use protocol v2 because the sed command looks for the "packfile"
	# section header.
	test_config -C "$SERVER" protocol.version 2 &&

	# Exercise to make sure it works.
	git -c protocol.version=2 clone \
	--filter=blob:none $HTTPD_URL/one_time_sed/server repo 2> err &&
	! grep "missing object referenced by" err &&

	# Ensure that the one-time-sed script was used.
	! test -e "$HTTPD_ROOT_PATH/one-time-sed"
	'

	stop_httpd

	test_done