diff options
Diffstat (limited to 'refs/packed-backend.c')
| -rw-r--r-- | refs/packed-backend.c | 39 |
1 files changed, 24 insertions, 15 deletions
diff --git a/refs/packed-backend.c b/refs/packed-backend.c index d447a731da..4458a0f69c 100644 --- a/refs/packed-backend.c +++ b/refs/packed-backend.c @@ -274,8 +274,8 @@ struct snapshot_record { static int cmp_packed_ref_records(const void *v1, const void *v2) { const struct snapshot_record *e1 = v1, *e2 = v2; - const char *r1 = e1->start + GIT_SHA1_HEXSZ + 1; - const char *r2 = e2->start + GIT_SHA1_HEXSZ + 1; + const char *r1 = e1->start + the_hash_algo->hexsz + 1; + const char *r2 = e2->start + the_hash_algo->hexsz + 1; while (1) { if (*r1 == '\n') @@ -297,7 +297,7 @@ static int cmp_packed_ref_records(const void *v1, const void *v2) */ static int cmp_record_to_refname(const char *rec, const char *refname) { - const char *r1 = rec + GIT_SHA1_HEXSZ + 1; + const char *r1 = rec + the_hash_algo->hexsz + 1; const char *r2 = refname; while (1) { @@ -344,7 +344,7 @@ static void sort_snapshot(struct snapshot *snapshot) if (!eol) /* The safety check should prevent this. */ BUG("unterminated line found in packed-refs"); - if (eol - pos < GIT_SHA1_HEXSZ + 2) + if (eol - pos < the_hash_algo->hexsz + 2) die_invalid_line(snapshot->refs->path, pos, eof - pos); eol++; @@ -456,7 +456,7 @@ static void verify_buffer_safe(struct snapshot *snapshot) return; last_line = find_start_of_record(start, eof - 1); - if (*(eof - 1) != '\n' || eof - last_line < GIT_SHA1_HEXSZ + 2) + if (*(eof - 1) != '\n' || eof - last_line < the_hash_algo->hexsz + 2) die_invalid_line(snapshot->refs->path, last_line, eof - last_line); } @@ -796,7 +796,7 @@ static int next_record(struct packed_ref_iterator *iter) iter->base.flags = REF_ISPACKED; - if (iter->eof - p < GIT_SHA1_HEXSZ + 2 || + if (iter->eof - p < the_hash_algo->hexsz + 2 || parse_oid_hex(p, &iter->oid, &p) || !isspace(*p++)) die_invalid_line(iter->snapshot->refs->path, @@ -826,7 +826,7 @@ static int next_record(struct packed_ref_iterator *iter) if (iter->pos < iter->eof && *iter->pos == '^') { p = iter->pos + 1; - if (iter->eof - p < GIT_SHA1_HEXSZ + 1 || + if (iter->eof - p < the_hash_algo->hexsz + 1 || parse_oid_hex(p, &iter->peeled, &p) || *p++ != '\n') die_invalid_line(iter->snapshot->refs->path, @@ -1012,14 +1012,23 @@ int packed_refs_lock(struct ref_store *ref_store, int flags, struct strbuf *err) } /* - * Now that we hold the `packed-refs` lock, make sure that our - * snapshot matches the current version of the file. Normally - * `get_snapshot()` does that for us, but that function - * assumes that when the file is locked, any existing snapshot - * is still valid. We've just locked the file, but it might - * have changed the moment *before* we locked it. + * There is a stat-validity problem might cause `update-ref -d` + * lost the newly commit of a ref, because a new `packed-refs` + * file might has the same on-disk file attributes such as + * timestamp, file size and inode value, but has a changed + * ref value. + * + * This could happen with a very small chance when + * `update-ref -d` is called and at the same time another + * `pack-refs --all` process is running. + * + * Now that we hold the `packed-refs` lock, it is important + * to make sure we could read the latest version of + * `packed-refs` file no matter we have just mmap it or not. + * So what need to do is clear the snapshot if we hold it + * already. */ - validate_snapshot(refs); + clear_snapshot(refs); /* * Now make sure that the packed-refs file as it exists in the @@ -1160,7 +1169,7 @@ static int write_with_updates(struct packed_ref_store *refs, "reference already exists", update->refname); goto error; - } else if (oidcmp(&update->old_oid, iter->oid)) { + } else if (!oideq(&update->old_oid, iter->oid)) { strbuf_addf(err, "cannot update ref '%s': " "is at %s but expected %s", update->refname, |