[PATCH v2 02/13] pack-revindex: open index if necessary
- From
Jeff King <peff@peff.net>
- Date
- Apr 5, 2019, 18:04 UTC
- Message-ID
- <20190405180423.GB32243@sigill.intra.peff.net>
- In-Reply-To
- <20190405180306.GA21113@sigill.intra.peff.net>
We can't create a pack revindex if we haven't actually looked at the index. Normally we would never get as far as creating a revindex without having already been looking in the pack, so this code never bothered to double-check that pack->index_data had been loaded.
But with the new multi-pack-index feature, many code paths might not load the individual pack .idx at all (they'd find objects via the midx and then open the .pack, but not its index).
This can't yet be triggered in practice, because a bug in the midx code means we accidentally open up the individual .idx files anyway. But in preparation for fixing that, let's have the revindex code check that everything it needs has been loaded.
In most cases this will just be a quick noop. But note that this does introduce a possibility of error (if we have to open the index and it's corrupt), so load_pack_revindex() now returns a result code, and callers need to handle the error.
Signed-off-by: Jeff King <peff@peff.net> --- pack-bitmap.c | 3 ++- pack-revindex.c | 13 ++++++++++--- pack-revindex.h | 2 +- packfile.c | 6 ++++-- 4 files changed, 17 insertions(+), 7 deletions(-)
diff --git a/pack-bitmap.c b/pack-bitmap.c index 4695aaf6b4..3960ad94c8 100644 --- a/pack-bitmap.c +++ b/pack-bitmap.c @@ -308,7 +308,8 @@ static int load_pack_bitmap(struct bitmap_index *bitmap_git) bitmap_git->bitmaps = kh_init_sha1(); bitmap_git->ext_index.positions = kh_init_sha1_pos(); - load_pack_revindex(bitmap_git->pack); + if (load_pack_revindex(bitmap_git->pack)) + goto failed; if (!(bitmap_git->commits = read_bitmap_1(bitmap_git)) || !(bitmap_git->trees = read_bitmap_1(bitmap_git)) || diff --git a/pack-revindex.c b/pack-revindex.c index 50891f77a2..d28a7e43d0 100644 --- a/pack-revindex.c +++ b/pack-revindex.c @@ -1,6 +1,7 @@ #include "cache.h" #include "pack-revindex.h" #include "object-store.h" +#include "packfile.h" /* * Pack index for existing packs give us easy access to the offsets into @@ -158,10 +159,14 @@ static void create_pack_revindex(struct packed_git *p) sort_revindex(p->revindex, num_ent, p->pack_size); } -void load_pack_revindex(struct packed_git *p) +int load_pack_revindex(struct packed_git *p) { - if (!p->revindex) + if (!p->revindex) { + if (open_pack_index(p)) + return -1; create_pack_revindex(p); + } + return 0; } int find_revindex_position(struct packed_git *p, off_t ofs) @@ -188,7 +193,9 @@ struct revindex_entry *find_pack_revindex(struct packed_git *p, off_t ofs) { int pos; - load_pack_revindex(p); + if (load_pack_revindex(p)) + return NULL; + pos = find_revindex_position(p, ofs); if (pos < 0) diff --git a/pack-revindex.h b/pack-revindex.h index e262f3efe8..848331d5d6 100644 --- a/pack-revindex.h +++ b/pack-revindex.h @@ -8,7 +8,7 @@ struct revindex_entry { unsigned int nr; }; -void load_pack_revindex(struct packed_git *p); +int load_pack_revindex(struct packed_git *p); int find_revindex_position(struct packed_git *p, off_t ofs); struct revindex_entry *find_pack_revindex(struct packed_git *p, off_t ofs); diff --git a/packfile.c b/packfile.c index 16bcb75262..6e40bd89c7 100644 --- a/packfile.c +++ b/packfile.c @@ -2023,8 +2023,10 @@ int for_each_object_in_pack(struct packed_git *p, uint32_t i; int r = 0; - if (flags & FOR_EACH_OBJECT_PACK_ORDER) - load_pack_revindex(p); + if (flags & FOR_EACH_OBJECT_PACK_ORDER) { + if (load_pack_revindex(p)) + return -1; + } for (i = 0; i < p->num_objects; i++) { uint32_t pos;
-- 2.21.0.729.g7d31bf3764