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fetch-pack: always allow fetching of literal SHA1s 

fetch-pack, when fetching a literal SHA-1 from a server that is not
configured with uploadpack.allowtipsha1inwant (or similar), always
returns an error message of the form "Server does not allow request for
unadvertised object %s". However, it is sometimes the case that such
object is advertised. This situation would occur, for example, if a user
or a script was provided a SHA-1 instead of a branch or tag name for
fetching, and wanted to invoke "git fetch" or "git fetch-pack" using
that SHA-1.

Teach fetch-pack to also check the SHA-1s of the refs in the received
ref advertisement if a literal SHA-1 was given by the user.

Helped-by: Jeff King <peff@peff.net>
Signed-off-by: Jonathan Tan <jonathantanmy@google.com>
Reviewed-by: Jonathan Nieder <jrnieder@gmail.com>
Reviewed-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
maint
Jonathan Tan 2017-05-15 10:32:20 -07:00 committed by Junio C Hamano
parent b06d364310
commit fdb69d33c4
2 changed files with 73 additions and 2 deletions
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40
fetch-pack.c
View File

@ -15,6 +15,7 @@
#include "version.h"
#include "prio-queue.h"
#include "sha1-array.h"
#include "oidset.h"

static int transfer_unpack_limit = -1;
static int fetch_unpack_limit = -1;
@ -592,13 +593,38 @@ static void mark_recent_complete_commits(struct fetch_pack_args *args,
}
}

static void add_refs_to_oidset(struct oidset *oids, struct ref *refs)
{
for (; refs; refs = refs->next)
oidset_insert(oids, &refs->old_oid);
}

static int tip_oids_contain(struct oidset *tip_oids,
struct ref *unmatched, struct ref *newlist,
const struct object_id *id)
{
/*
* Note that this only looks at the ref lists the first time it's
* called. This works out in filter_refs() because even though it may
* add to "newlist" between calls, the additions will always be for
* oids that are already in the set.
*/
if (!tip_oids->map.tablesize) {
add_refs_to_oidset(tip_oids, unmatched);
add_refs_to_oidset(tip_oids, newlist);
}
return oidset_contains(tip_oids, id);
}

static void filter_refs(struct fetch_pack_args *args,
struct ref **refs,
struct ref **sought, int nr_sought)
{
struct ref *newlist = NULL;
struct ref **newtail = &newlist;
struct ref *unmatched = NULL;
struct ref *ref, *next;
struct oidset tip_oids = OIDSET_INIT;
int i;

i = 0;
@ -631,7 +657,8 @@ static void filter_refs(struct fetch_pack_args *args,
ref->next = NULL;
newtail = &ref->next;
} else {
free(ref);
ref->next = unmatched;
unmatched = ref;
}
}

@ -648,7 +675,9 @@ static void filter_refs(struct fetch_pack_args *args,
continue;

if ((allow_unadvertised_object_request &
(ALLOW_TIP_SHA1 | ALLOW_REACHABLE_SHA1))) {
(ALLOW_TIP_SHA1 | ALLOW_REACHABLE_SHA1)) ||
tip_oids_contain(&tip_oids, unmatched, newlist,
&ref->old_oid)) {
ref->match_status = REF_MATCHED;
*newtail = copy_ref(ref);
newtail = &(*newtail)->next;
@ -656,6 +685,13 @@ static void filter_refs(struct fetch_pack_args *args,
ref->match_status = REF_UNADVERTISED_NOT_ALLOWED;
}
}

oidset_clear(&tip_oids);
for (ref = unmatched; ref; ref = next) {
next = ref->next;
free(ref);
}

*refs = newlist;
}


35
t/t5500-fetch-pack.sh
View File

@ -547,6 +547,41 @@ test_expect_success 'fetch-pack can fetch a raw sha1' '
git fetch-pack hidden $(git -C hidden rev-parse refs/hidden/one)
'

test_expect_success 'fetch-pack can fetch a raw sha1 that is advertised as a ref' '
rm -rf server client &&
git init server &&
test_commit -C server 1 &&

git init client &&
git -C client fetch-pack ../server \
$(git -C server rev-parse refs/heads/master)
'

test_expect_success 'fetch-pack can fetch a raw sha1 overlapping a named ref' '
rm -rf server client &&
git init server &&
test_commit -C server 1 &&
test_commit -C server 2 &&

git init client &&
git -C client fetch-pack ../server \
$(git -C server rev-parse refs/tags/1) refs/tags/1
'

test_expect_success 'fetch-pack cannot fetch a raw sha1 that is not advertised as a ref' '
rm -rf server &&

git init server &&
test_commit -C server 5 &&
git -C server tag -d 5 &&
test_commit -C server 6 &&

git init client &&
test_must_fail git -C client fetch-pack ../server \
$(git -C server rev-parse refs/heads/master^) 2>err &&
test_i18ngrep "Server does not allow request for unadvertised object" err
'

check_prot_path () {
cat >expected <<-EOF &&
Diag: url=$1