#include "thread-utils.h"
#include "packfile.h"
#include "object-store.h"
+#include "fetch-object.h"
static const char index_pack_usage[] =
"git index-pack [-v] [-o <index-file>] [--keep | --keep=<msg>] [--verify] [--strict] (<pack-file> | --stdin [--fix-thin] [<pack-file>])";
sorted_by_pos[i] = &ref_deltas[i];
QSORT(sorted_by_pos, nr_ref_deltas, delta_pos_compare);
+ if (repository_format_partial_clone) {
+ /*
+ * Prefetch the delta bases.
+ */
+ struct oid_array to_fetch = OID_ARRAY_INIT;
+ for (i = 0; i < nr_ref_deltas; i++) {
+ struct ref_delta_entry *d = sorted_by_pos[i];
+ if (!oid_object_info_extended(the_repository, &d->oid,
+ NULL,
+ OBJECT_INFO_FOR_PREFETCH))
+ continue;
+ oid_array_append(&to_fetch, &d->oid);
+ }
+ if (to_fetch.nr)
+ fetch_objects(repository_format_partial_clone,
+ to_fetch.oid, to_fetch.nr);
+ oid_array_clear(&to_fetch);
+ }
+
for (i = 0; i < nr_ref_deltas; i++) {
struct ref_delta_entry *d = sorted_by_pos[i];
enum object_type type;
int report_end_of_input = 0;
/*
- * index-pack never needs to fetch missing objects, since it only
- * accesses the repo to do hash collision checks
+ * index-pack never needs to fetch missing objects except when
+ * REF_DELTA bases are missing (which are explicitly handled). It only
+ * accesses the repo to do hash collision checks and to check which
+ * REF_DELTA bases need to be fetched.
*/
fetch_if_missing = 0;
. "$TEST_DIRECTORY"/lib-httpd.sh
start_httpd
-# Converts bytes into a form suitable for inclusion in a sed command. For
-# example, "printf 'ab\r\n' | hex_unpack" results in '\x61\x62\x0d\x0a'.
-sed_escape () {
- perl -e '$/ = 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' '
# 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.
# 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.
! 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