| /* |
| * Copyright (c) 2011, Google Inc. |
| */ |
| #include "cache.h" |
| #include "bulk-checkin.h" |
| #include "csum-file.h" |
| #include "pack.h" |
| #include "strbuf.h" |
| |
| static int pack_compression_level = Z_DEFAULT_COMPRESSION; |
| |
| static struct bulk_checkin_state { |
| unsigned plugged:1; |
| |
| char *pack_tmp_name; |
| struct sha1file *f; |
| off_t offset; |
| struct pack_idx_option pack_idx_opts; |
| |
| struct pack_idx_entry **written; |
| uint32_t alloc_written; |
| uint32_t nr_written; |
| } state; |
| |
| static void finish_bulk_checkin(struct bulk_checkin_state *state) |
| { |
| struct object_id oid; |
| struct strbuf packname = STRBUF_INIT; |
| int i; |
| |
| if (!state->f) |
| return; |
| |
| if (state->nr_written == 0) { |
| close(state->f->fd); |
| unlink(state->pack_tmp_name); |
| goto clear_exit; |
| } else if (state->nr_written == 1) { |
| sha1close(state->f, oid.hash, CSUM_FSYNC); |
| } else { |
| int fd = sha1close(state->f, oid.hash, 0); |
| fixup_pack_header_footer(fd, oid.hash, state->pack_tmp_name, |
| state->nr_written, oid.hash, |
| state->offset); |
| close(fd); |
| } |
| |
| strbuf_addf(&packname, "%s/pack/pack-", get_object_directory()); |
| finish_tmp_packfile(&packname, state->pack_tmp_name, |
| state->written, state->nr_written, |
| &state->pack_idx_opts, oid.hash); |
| for (i = 0; i < state->nr_written; i++) |
| free(state->written[i]); |
| |
| clear_exit: |
| free(state->written); |
| memset(state, 0, sizeof(*state)); |
| |
| strbuf_release(&packname); |
| /* Make objects we just wrote available to ourselves */ |
| reprepare_packed_git(); |
| } |
| |
| static int already_written(struct bulk_checkin_state *state, unsigned char sha1[]) |
| { |
| int i; |
| |
| /* The object may already exist in the repository */ |
| if (has_sha1_file(sha1)) |
| return 1; |
| |
| /* Might want to keep the list sorted */ |
| for (i = 0; i < state->nr_written; i++) |
| if (!hashcmp(state->written[i]->sha1, sha1)) |
| return 1; |
| |
| /* This is a new object we need to keep */ |
| return 0; |
| } |
| |
| /* |
| * Read the contents from fd for size bytes, streaming it to the |
| * packfile in state while updating the hash in ctx. Signal a failure |
| * by returning a negative value when the resulting pack would exceed |
| * the pack size limit and this is not the first object in the pack, |
| * so that the caller can discard what we wrote from the current pack |
| * by truncating it and opening a new one. The caller will then call |
| * us again after rewinding the input fd. |
| * |
| * The already_hashed_to pointer is kept untouched by the caller to |
| * make sure we do not hash the same byte when we are called |
| * again. This way, the caller does not have to checkpoint its hash |
| * status before calling us just in case we ask it to call us again |
| * with a new pack. |
| */ |
| static int stream_to_pack(struct bulk_checkin_state *state, |
| git_SHA_CTX *ctx, off_t *already_hashed_to, |
| int fd, size_t size, enum object_type type, |
| const char *path, unsigned flags) |
| { |
| git_zstream s; |
| unsigned char obuf[16384]; |
| unsigned hdrlen; |
| int status = Z_OK; |
| int write_object = (flags & HASH_WRITE_OBJECT); |
| off_t offset = 0; |
| |
| git_deflate_init(&s, pack_compression_level); |
| |
| hdrlen = encode_in_pack_object_header(type, size, obuf); |
| s.next_out = obuf + hdrlen; |
| s.avail_out = sizeof(obuf) - hdrlen; |
| |
| while (status != Z_STREAM_END) { |
| unsigned char ibuf[16384]; |
| |
| if (size && !s.avail_in) { |
| ssize_t rsize = size < sizeof(ibuf) ? size : sizeof(ibuf); |
| if (read_in_full(fd, ibuf, rsize) != rsize) |
| die("failed to read %d bytes from '%s'", |
| (int)rsize, path); |
| offset += rsize; |
| if (*already_hashed_to < offset) { |
| size_t hsize = offset - *already_hashed_to; |
| if (rsize < hsize) |
| hsize = rsize; |
| if (hsize) |
| git_SHA1_Update(ctx, ibuf, hsize); |
| *already_hashed_to = offset; |
| } |
| s.next_in = ibuf; |
| s.avail_in = rsize; |
| size -= rsize; |
| } |
| |
| status = git_deflate(&s, size ? 0 : Z_FINISH); |
| |
| if (!s.avail_out || status == Z_STREAM_END) { |
| if (write_object) { |
| size_t written = s.next_out - obuf; |
| |
| /* would we bust the size limit? */ |
| if (state->nr_written && |
| pack_size_limit_cfg && |
| pack_size_limit_cfg < state->offset + written) { |
| git_deflate_abort(&s); |
| return -1; |
| } |
| |
| sha1write(state->f, obuf, written); |
| state->offset += written; |
| } |
| s.next_out = obuf; |
| s.avail_out = sizeof(obuf); |
| } |
| |
| switch (status) { |
| case Z_OK: |
| case Z_BUF_ERROR: |
| case Z_STREAM_END: |
| continue; |
| default: |
| die("unexpected deflate failure: %d", status); |
| } |
| } |
| git_deflate_end(&s); |
| return 0; |
| } |
| |
| /* Lazily create backing packfile for the state */ |
| static void prepare_to_stream(struct bulk_checkin_state *state, |
| unsigned flags) |
| { |
| if (!(flags & HASH_WRITE_OBJECT) || state->f) |
| return; |
| |
| state->f = create_tmp_packfile(&state->pack_tmp_name); |
| reset_pack_idx_option(&state->pack_idx_opts); |
| |
| /* Pretend we are going to write only one object */ |
| state->offset = write_pack_header(state->f, 1); |
| if (!state->offset) |
| die_errno("unable to write pack header"); |
| } |
| |
| static int deflate_to_pack(struct bulk_checkin_state *state, |
| unsigned char result_sha1[], |
| int fd, size_t size, |
| enum object_type type, const char *path, |
| unsigned flags) |
| { |
| off_t seekback, already_hashed_to; |
| git_SHA_CTX ctx; |
| unsigned char obuf[16384]; |
| unsigned header_len; |
| struct sha1file_checkpoint checkpoint; |
| struct pack_idx_entry *idx = NULL; |
| |
| seekback = lseek(fd, 0, SEEK_CUR); |
| if (seekback == (off_t) -1) |
| return error("cannot find the current offset"); |
| |
| header_len = xsnprintf((char *)obuf, sizeof(obuf), "%s %" PRIuMAX, |
| typename(type), (uintmax_t)size) + 1; |
| git_SHA1_Init(&ctx); |
| git_SHA1_Update(&ctx, obuf, header_len); |
| |
| /* Note: idx is non-NULL when we are writing */ |
| if ((flags & HASH_WRITE_OBJECT) != 0) |
| idx = xcalloc(1, sizeof(*idx)); |
| |
| already_hashed_to = 0; |
| |
| while (1) { |
| prepare_to_stream(state, flags); |
| if (idx) { |
| sha1file_checkpoint(state->f, &checkpoint); |
| idx->offset = state->offset; |
| crc32_begin(state->f); |
| } |
| if (!stream_to_pack(state, &ctx, &already_hashed_to, |
| fd, size, type, path, flags)) |
| break; |
| /* |
| * Writing this object to the current pack will make |
| * it too big; we need to truncate it, start a new |
| * pack, and write into it. |
| */ |
| if (!idx) |
| die("BUG: should not happen"); |
| sha1file_truncate(state->f, &checkpoint); |
| state->offset = checkpoint.offset; |
| finish_bulk_checkin(state); |
| if (lseek(fd, seekback, SEEK_SET) == (off_t) -1) |
| return error("cannot seek back"); |
| } |
| git_SHA1_Final(result_sha1, &ctx); |
| if (!idx) |
| return 0; |
| |
| idx->crc32 = crc32_end(state->f); |
| if (already_written(state, result_sha1)) { |
| sha1file_truncate(state->f, &checkpoint); |
| state->offset = checkpoint.offset; |
| free(idx); |
| } else { |
| hashcpy(idx->sha1, result_sha1); |
| ALLOC_GROW(state->written, |
| state->nr_written + 1, |
| state->alloc_written); |
| state->written[state->nr_written++] = idx; |
| } |
| return 0; |
| } |
| |
| int index_bulk_checkin(unsigned char *sha1, |
| int fd, size_t size, enum object_type type, |
| const char *path, unsigned flags) |
| { |
| int status = deflate_to_pack(&state, sha1, fd, size, type, |
| path, flags); |
| if (!state.plugged) |
| finish_bulk_checkin(&state); |
| return status; |
| } |
| |
| void plug_bulk_checkin(void) |
| { |
| state.plugged = 1; |
| } |
| |
| void unplug_bulk_checkin(void) |
| { |
| state.plugged = 0; |
| if (state.f) |
| finish_bulk_checkin(&state); |
| } |