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fetch: in partial clone, check presence of targets 

When fetching an object that is known as a promisor object to the local
repository, the connectivity check in quickfetch() in builtin/fetch.c
succeeds, causing object transfer to be bypassed. However, this should
not happen if that object is merely promised and not actually present.

Because this happens, when a user invokes "git fetch origin <sha-1>" on
the command-line, the <sha-1> object may not actually be fetched even
though the command returns an exit code of 0. This is a similar issue
(but with a different cause) to the one fixed by a0c9016abd
("upload-pack: send refs' objects despite "filter"", 2018-07-09).

Therefore, update quickfetch() to also directly check for the presence
of all objects to be fetched. Its documentation and name are also
updated to better reflect what it does.

Signed-off-by: Jonathan Tan <jonathantanmy@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
maint
Jonathan Tan 2018-09-21 11:22:38 -07:00 committed by Junio C Hamano
parent 4937291b45
commit 35f9e3e5e7
2 changed files with 30 additions and 2 deletions
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15
builtin/fetch.c
View File

@ -931,10 +931,11 @@ static int store_updated_refs(const char *raw_url, const char *remote_name,
* everything we are going to fetch already exists and is connected
* locally.
*/
static int quickfetch(struct ref *ref_map)
static int check_exist_and_connected(struct ref *ref_map)
{
struct ref *rm = ref_map;
struct check_connected_options opt = CHECK_CONNECTED_INIT;
struct ref *r;

/*
* If we are deepening a shallow clone we already have these
@ -945,13 +946,23 @@ static int quickfetch(struct ref *ref_map)
*/
if (deepen)
return -1;

/*
* check_connected() allows objects to merely be promised, but
* we need all direct targets to exist.
*/
for (r = rm; r; r = r->next) {
if (!has_object_file(&r->old_oid))
return -1;
}

opt.quiet = 1;
return check_connected(iterate_ref_map, &rm, &opt);
}

static int fetch_refs(struct transport *transport, struct ref *ref_map)
{
int ret = quickfetch(ref_map);
int ret = check_exist_and_connected(ref_map);
if (ret)
ret = transport_fetch_refs(transport, ref_map);
if (!ret)

17
t/t5616-partial-clone.sh
View File

@ -170,6 +170,23 @@ test_expect_success 'partial clone fetches blobs pointed to by refs even if norm
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