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| /* | |
| * Copyright (c) 2011, Google Inc. | |
| */ | |
| #include "cache.h" | |
| #include "bulk-checkin.h" | |
| #include "csum-file.h" | |
| #include "pack.h" | |
| #include "strbuf.h" | |
| 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]->oid.hash, 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(obuf, sizeof(obuf), type, size); | |
| 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->oid.hash, 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); | |
| } |