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authorLibravatar Junio C Hamano <gitster@pobox.com>2019-07-25 14:27:12 -0700
committerLibravatar Junio C Hamano <gitster@pobox.com>2019-07-25 14:27:12 -0700
commitf54a2a8f6a56d076ed36b8a68d2def2366dd7da1 (patch)
treec5033cae1c57810e47a578e4d0744d59a3682a39 /t
parentMerge branch 'xl/record-partial-clone-origin' into maint (diff)
parentt5616: cover case of client having delta base (diff)
downloadtgif-f54a2a8f6a56d076ed36b8a68d2def2366dd7da1.tar.xz
Merge branch 'jt/partial-clone-missing-ref-delta-base' into maint
"git fetch" into a lazy clone forgot to fetch base objects that are necessary to complete delta in a thin packfile, which has been corrected. * jt/partial-clone-missing-ref-delta-base: t5616: cover case of client having delta base t5616: use correct flag to check object is missing index-pack: prefetch missing REF_DELTA bases t5616: refactor packfile replacement
Diffstat (limited to 't')
-rwxr-xr-xt/t5616-partial-clone.sh112
1 files changed, 99 insertions, 13 deletions
diff --git a/t/t5616-partial-clone.sh b/t/t5616-partial-clone.sh
index 9a8f9886b3..b91ef548f8 100755
--- a/t/t5616-partial-clone.sh
+++ b/t/t5616-partial-clone.sh
@@ -244,11 +244,25 @@ test_expect_success 'fetch what is specified on CLI even if already promised' '
. "$TEST_DIRECTORY"/lib-httpd.sh
start_httpd
-# Converts bytes into a form suitable for inclusion in a sed command. For
-# example, "printf 'ab\r\n' | hex_unpack" results in '\x61\x62\x0d\x0a'.
-sed_escape () {
- perl -e '$/ = undef; $input = <>; print unpack("H2" x length($input), $input)' |
- sed 's/\(..\)/\\x\1/g'
+# Converts bytes into their hexadecimal representation. For example,
+# "printf 'ab\r\n' | hex_unpack" results in '61620d0a'.
+hex_unpack () {
+ perl -e '$/ = undef; $input = <>; print unpack("H2" x length($input), $input)'
+}
+
+# Inserts $1 at the start of the string and every 2 characters thereafter.
+intersperse () {
+ sed 's/\(..\)/'$1'\1/g'
+}
+
+# Create a one-time-sed command to replace the existing packfile with $1.
+replace_packfile () {
+ # The protocol requires that the packfile be sent in sideband 1, hence
+ # the extra \x01 byte at the beginning.
+ printf "1,/packfile/!c %04x\\\\x01%s0000" \
+ "$(($(wc -c <$1) + 5))" \
+ "$(hex_unpack <$1 | intersperse '\\x')" \
+ >"$HTTPD_ROOT_PATH/one-time-sed"
}
test_expect_success 'upon cloning, check that all refs point to objects' '
@@ -270,10 +284,7 @@ test_expect_success 'upon cloning, check that all refs point to objects' '
# 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" &&
+ replace_packfile incomplete.pack &&
# Use protocol v2 because the sed command looks for the "packfile"
# section header.
@@ -313,10 +324,7 @@ test_expect_success 'when partial cloning, tolerate server not sending target of
# 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" &&
+ replace_packfile incomplete.pack &&
# Use protocol v2 because the sed command looks for the "packfile"
# section header.
@@ -331,4 +339,82 @@ test_expect_success 'when partial cloning, tolerate server not sending target of
! test -e "$HTTPD_ROOT_PATH/one-time-sed"
'
+test_expect_success 'tolerate server sending REF_DELTA against missing promisor objects' '
+ SERVER="$HTTPD_DOCUMENT_ROOT_PATH/server" &&
+ rm -rf "$SERVER" repo &&
+ test_create_repo "$SERVER" &&
+ test_config -C "$SERVER" uploadpack.allowfilter 1 &&
+ test_config -C "$SERVER" uploadpack.allowanysha1inwant 1 &&
+
+ # Create a commit with 2 blobs to be used as delta bases.
+ for i in $(test_seq 10)
+ do
+ echo "this is a line" >>"$SERVER/foo.txt" &&
+ echo "this is another line" >>"$SERVER/have.txt"
+ done &&
+ git -C "$SERVER" add foo.txt have.txt &&
+ git -C "$SERVER" commit -m bar &&
+ git -C "$SERVER" rev-parse HEAD:foo.txt >deltabase_missing &&
+ git -C "$SERVER" rev-parse HEAD:have.txt >deltabase_have &&
+
+ # Clone. The client has deltabase_have but not deltabase_missing.
+ git -c protocol.version=2 clone --no-checkout \
+ --filter=blob:none $HTTPD_URL/one_time_sed/server repo &&
+ git -C repo hash-object -w -- "$SERVER/have.txt" &&
+
+ # Sanity check to ensure that the client does not have
+ # deltabase_missing.
+ git -C repo rev-list --objects --ignore-missing \
+ -- $(cat deltabase_missing) >objlist &&
+ test_line_count = 0 objlist &&
+
+ # Another commit. This commit will be fetched by the client.
+ echo "abcdefghijklmnopqrstuvwxyz" >>"$SERVER/foo.txt" &&
+ echo "abcdefghijklmnopqrstuvwxyz" >>"$SERVER/have.txt" &&
+ git -C "$SERVER" add foo.txt have.txt &&
+ git -C "$SERVER" commit -m baz &&
+
+ # Pack a thin pack containing, among other things, HEAD:foo.txt
+ # delta-ed against HEAD^:foo.txt and HEAD:have.txt delta-ed against
+ # HEAD^:have.txt.
+ printf "%s\n--not\n%s\n" \
+ $(git -C "$SERVER" rev-parse HEAD) \
+ $(git -C "$SERVER" rev-parse HEAD^) |
+ git -C "$SERVER" pack-objects --thin --stdout >thin.pack &&
+
+ # Ensure that the pack contains one delta against HEAD^:foo.txt. Since
+ # the delta contains at least 26 novel characters, the size cannot be
+ # contained in 4 bits, so the object header will take up 2 bytes. The
+ # most significant nybble of the first byte is 0b1111 (0b1 to indicate
+ # that the header continues, and 0b111 to indicate REF_DELTA), followed
+ # by any 3 nybbles, then the OID of the delta base.
+ printf "f.,..%s" $(intersperse "," <deltabase_missing) >want &&
+ hex_unpack <thin.pack | intersperse "," >have &&
+ grep $(cat want) have &&
+
+ # Ensure that the pack contains one delta against HEAD^:have.txt,
+ # similar to the above.
+ printf "f.,..%s" $(intersperse "," <deltabase_have) >want &&
+ hex_unpack <thin.pack | intersperse "," >have &&
+ grep $(cat want) have &&
+
+ replace_packfile thin.pack &&
+
+ # Use protocol v2 because the sed command looks for the "packfile"
+ # section header.
+ test_config -C "$SERVER" protocol.version 2 &&
+
+ # Fetch the thin pack and ensure that index-pack is able to handle the
+ # REF_DELTA object with a missing promisor delta base.
+ GIT_TRACE_PACKET="$(pwd)/trace" git -C repo -c protocol.version=2 fetch &&
+
+ # Ensure that the missing delta base was directly fetched, but not the
+ # one that the client has.
+ grep "want $(cat deltabase_missing)" trace &&
+ ! grep "want $(cat deltabase_have)" trace &&
+
+ # Ensure that the one-time-sed script was used.
+ ! test -e "$HTTPD_ROOT_PATH/one-time-sed"
+'
+
test_done