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authorJunio C Hamano <gitster@pobox.com>2008-09-09 01:27:10 -0700
committerJunio C Hamano <gitster@pobox.com>2008-09-09 09:27:46 -0700
commitd79796bcf05b89774671a75b3285000c43129823 (patch)
tree55b74ef2a92d3220d61ee0b95ea632518c756746 /sha1_file.c
parent40c155ff14c8b313d408f2e51a55c881ce082e4e (diff)
downloadgit-d79796bcf05b89774671a75b3285000c43129823.tar.gz
git-d79796bcf05b89774671a75b3285000c43129823.tar.xz
push: receiver end advertises refs from alternate repositories
Earlier, when pushing into a repository that borrows from alternate object stores, we followed the longstanding design decision not to trust refs in the alternate repository that houses the object store we are borrowing from. If your public repository is borrowing from Linus's public repository, you pushed into it long time ago, and now when you try to push your updated history that is in sync with more recent history from Linus, you will end up sending not just your own development, but also the changes you acquired through Linus's tree, even though the objects needed for the latter already exists at the receiving end. This is because the receiving end does not advertise that the objects only reachable from the borrowed repository (i.e. Linus's) are already available there. This solves the issue by making the receiving end advertise refs from borrowed repositories. They are not sent with their true names but with a phoney name ".have" to make sure that the old senders will safely ignore them (otherwise, the old senders will misbehave, trying to push matching refs, and mirror push that deletes refs that only exist at the receiving end). Signed-off-by: Junio C Hamano <gitster@pobox.com>
Diffstat (limited to 'sha1_file.c')
-rw-r--r--sha1_file.c10
1 files changed, 10 insertions, 0 deletions
diff --git a/sha1_file.c b/sha1_file.c
index ae550e89c..12be17b5d 100644
--- a/sha1_file.c
+++ b/sha1_file.c
@@ -393,6 +393,16 @@ void add_to_alternates_file(const char *reference)
link_alt_odb_entries(alt, alt + strlen(alt), '\n', NULL, 0);
}
+void foreach_alt_odb(alt_odb_fn fn, void *cb)
+{
+ struct alternate_object_database *ent;
+
+ prepare_alt_odb();
+ for (ent = alt_odb_list; ent; ent = ent->next)
+ if (fn(ent, cb))
+ return;
+}
+
void prepare_alt_odb(void)
{
const char *alt;