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Commit | Line | Data |
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568508e7 JH |
1 | /* |
2 | * Copyright (c) 2011, Google Inc. | |
3 | */ | |
1c4b6604 | 4 | #include "cache.h" |
568508e7 JH |
5 | #include "bulk-checkin.h" |
6 | #include "csum-file.h" | |
7 | #include "pack.h" | |
58892711 | 8 | #include "strbuf.h" |
0abe14f6 | 9 | #include "packfile.h" |
568508e7 | 10 | |
568508e7 JH |
11 | static struct bulk_checkin_state { |
12 | unsigned plugged:1; | |
13 | ||
14 | char *pack_tmp_name; | |
15 | struct sha1file *f; | |
16 | off_t offset; | |
17 | struct pack_idx_option pack_idx_opts; | |
18 | ||
19 | struct pack_idx_entry **written; | |
20 | uint32_t alloc_written; | |
21 | uint32_t nr_written; | |
22 | } state; | |
23 | ||
24 | static void finish_bulk_checkin(struct bulk_checkin_state *state) | |
25 | { | |
fa33c3aa | 26 | struct object_id oid; |
58892711 | 27 | struct strbuf packname = STRBUF_INIT; |
568508e7 JH |
28 | int i; |
29 | ||
30 | if (!state->f) | |
31 | return; | |
32 | ||
33 | if (state->nr_written == 0) { | |
34 | close(state->f->fd); | |
35 | unlink(state->pack_tmp_name); | |
36 | goto clear_exit; | |
37 | } else if (state->nr_written == 1) { | |
fa33c3aa | 38 | sha1close(state->f, oid.hash, CSUM_FSYNC); |
568508e7 | 39 | } else { |
fa33c3aa | 40 | int fd = sha1close(state->f, oid.hash, 0); |
41 | fixup_pack_header_footer(fd, oid.hash, state->pack_tmp_name, | |
42 | state->nr_written, oid.hash, | |
568508e7 JH |
43 | state->offset); |
44 | close(fd); | |
45 | } | |
46 | ||
58892711 SH |
47 | strbuf_addf(&packname, "%s/pack/pack-", get_object_directory()); |
48 | finish_tmp_packfile(&packname, state->pack_tmp_name, | |
568508e7 | 49 | state->written, state->nr_written, |
fa33c3aa | 50 | &state->pack_idx_opts, oid.hash); |
568508e7 JH |
51 | for (i = 0; i < state->nr_written; i++) |
52 | free(state->written[i]); | |
53 | ||
54 | clear_exit: | |
55 | free(state->written); | |
56 | memset(state, 0, sizeof(*state)); | |
57 | ||
58892711 | 58 | strbuf_release(&packname); |
568508e7 JH |
59 | /* Make objects we just wrote available to ourselves */ |
60 | reprepare_packed_git(); | |
61 | } | |
62 | ||
63 | static int already_written(struct bulk_checkin_state *state, unsigned char sha1[]) | |
64 | { | |
65 | int i; | |
66 | ||
67 | /* The object may already exist in the repository */ | |
68 | if (has_sha1_file(sha1)) | |
69 | return 1; | |
70 | ||
71 | /* Might want to keep the list sorted */ | |
72 | for (i = 0; i < state->nr_written; i++) | |
e6a492b7 | 73 | if (!hashcmp(state->written[i]->oid.hash, sha1)) |
568508e7 JH |
74 | return 1; |
75 | ||
76 | /* This is a new object we need to keep */ | |
77 | return 0; | |
78 | } | |
79 | ||
80 | /* | |
81 | * Read the contents from fd for size bytes, streaming it to the | |
82 | * packfile in state while updating the hash in ctx. Signal a failure | |
83 | * by returning a negative value when the resulting pack would exceed | |
84 | * the pack size limit and this is not the first object in the pack, | |
85 | * so that the caller can discard what we wrote from the current pack | |
86 | * by truncating it and opening a new one. The caller will then call | |
87 | * us again after rewinding the input fd. | |
88 | * | |
89 | * The already_hashed_to pointer is kept untouched by the caller to | |
90 | * make sure we do not hash the same byte when we are called | |
91 | * again. This way, the caller does not have to checkpoint its hash | |
92 | * status before calling us just in case we ask it to call us again | |
93 | * with a new pack. | |
94 | */ | |
95 | static int stream_to_pack(struct bulk_checkin_state *state, | |
96 | git_SHA_CTX *ctx, off_t *already_hashed_to, | |
97 | int fd, size_t size, enum object_type type, | |
98 | const char *path, unsigned flags) | |
99 | { | |
100 | git_zstream s; | |
101 | unsigned char obuf[16384]; | |
102 | unsigned hdrlen; | |
103 | int status = Z_OK; | |
104 | int write_object = (flags & HASH_WRITE_OBJECT); | |
105 | off_t offset = 0; | |
106 | ||
568508e7 JH |
107 | git_deflate_init(&s, pack_compression_level); |
108 | ||
7202a6fa | 109 | hdrlen = encode_in_pack_object_header(obuf, sizeof(obuf), type, size); |
568508e7 JH |
110 | s.next_out = obuf + hdrlen; |
111 | s.avail_out = sizeof(obuf) - hdrlen; | |
112 | ||
113 | while (status != Z_STREAM_END) { | |
114 | unsigned char ibuf[16384]; | |
115 | ||
116 | if (size && !s.avail_in) { | |
117 | ssize_t rsize = size < sizeof(ibuf) ? size : sizeof(ibuf); | |
41dcc4dc JK |
118 | ssize_t read_result = read_in_full(fd, ibuf, rsize); |
119 | if (read_result < 0) | |
120 | die_errno("failed to read from '%s'", path); | |
121 | if (read_result != rsize) | |
568508e7 JH |
122 | die("failed to read %d bytes from '%s'", |
123 | (int)rsize, path); | |
124 | offset += rsize; | |
125 | if (*already_hashed_to < offset) { | |
126 | size_t hsize = offset - *already_hashed_to; | |
127 | if (rsize < hsize) | |
128 | hsize = rsize; | |
129 | if (hsize) | |
130 | git_SHA1_Update(ctx, ibuf, hsize); | |
131 | *already_hashed_to = offset; | |
132 | } | |
133 | s.next_in = ibuf; | |
134 | s.avail_in = rsize; | |
135 | size -= rsize; | |
136 | } | |
137 | ||
138 | status = git_deflate(&s, size ? 0 : Z_FINISH); | |
139 | ||
140 | if (!s.avail_out || status == Z_STREAM_END) { | |
141 | if (write_object) { | |
142 | size_t written = s.next_out - obuf; | |
143 | ||
144 | /* would we bust the size limit? */ | |
145 | if (state->nr_written && | |
146 | pack_size_limit_cfg && | |
147 | pack_size_limit_cfg < state->offset + written) { | |
148 | git_deflate_abort(&s); | |
149 | return -1; | |
150 | } | |
151 | ||
152 | sha1write(state->f, obuf, written); | |
153 | state->offset += written; | |
154 | } | |
155 | s.next_out = obuf; | |
156 | s.avail_out = sizeof(obuf); | |
157 | } | |
158 | ||
159 | switch (status) { | |
160 | case Z_OK: | |
161 | case Z_BUF_ERROR: | |
162 | case Z_STREAM_END: | |
163 | continue; | |
164 | default: | |
165 | die("unexpected deflate failure: %d", status); | |
166 | } | |
167 | } | |
168 | git_deflate_end(&s); | |
169 | return 0; | |
170 | } | |
171 | ||
172 | /* Lazily create backing packfile for the state */ | |
173 | static void prepare_to_stream(struct bulk_checkin_state *state, | |
174 | unsigned flags) | |
175 | { | |
176 | if (!(flags & HASH_WRITE_OBJECT) || state->f) | |
177 | return; | |
178 | ||
179 | state->f = create_tmp_packfile(&state->pack_tmp_name); | |
180 | reset_pack_idx_option(&state->pack_idx_opts); | |
181 | ||
182 | /* Pretend we are going to write only one object */ | |
183 | state->offset = write_pack_header(state->f, 1); | |
184 | if (!state->offset) | |
185 | die_errno("unable to write pack header"); | |
186 | } | |
187 | ||
188 | static int deflate_to_pack(struct bulk_checkin_state *state, | |
189 | unsigned char result_sha1[], | |
190 | int fd, size_t size, | |
191 | enum object_type type, const char *path, | |
192 | unsigned flags) | |
193 | { | |
194 | off_t seekback, already_hashed_to; | |
195 | git_SHA_CTX ctx; | |
196 | unsigned char obuf[16384]; | |
197 | unsigned header_len; | |
198 | struct sha1file_checkpoint checkpoint; | |
199 | struct pack_idx_entry *idx = NULL; | |
200 | ||
201 | seekback = lseek(fd, 0, SEEK_CUR); | |
202 | if (seekback == (off_t) -1) | |
203 | return error("cannot find the current offset"); | |
204 | ||
ef1286d3 JK |
205 | header_len = xsnprintf((char *)obuf, sizeof(obuf), "%s %" PRIuMAX, |
206 | typename(type), (uintmax_t)size) + 1; | |
568508e7 JH |
207 | git_SHA1_Init(&ctx); |
208 | git_SHA1_Update(&ctx, obuf, header_len); | |
209 | ||
210 | /* Note: idx is non-NULL when we are writing */ | |
211 | if ((flags & HASH_WRITE_OBJECT) != 0) | |
212 | idx = xcalloc(1, sizeof(*idx)); | |
213 | ||
214 | already_hashed_to = 0; | |
215 | ||
216 | while (1) { | |
217 | prepare_to_stream(state, flags); | |
218 | if (idx) { | |
219 | sha1file_checkpoint(state->f, &checkpoint); | |
220 | idx->offset = state->offset; | |
221 | crc32_begin(state->f); | |
222 | } | |
223 | if (!stream_to_pack(state, &ctx, &already_hashed_to, | |
224 | fd, size, type, path, flags)) | |
225 | break; | |
226 | /* | |
227 | * Writing this object to the current pack will make | |
228 | * it too big; we need to truncate it, start a new | |
229 | * pack, and write into it. | |
230 | */ | |
231 | if (!idx) | |
232 | die("BUG: should not happen"); | |
233 | sha1file_truncate(state->f, &checkpoint); | |
234 | state->offset = checkpoint.offset; | |
235 | finish_bulk_checkin(state); | |
236 | if (lseek(fd, seekback, SEEK_SET) == (off_t) -1) | |
237 | return error("cannot seek back"); | |
238 | } | |
239 | git_SHA1_Final(result_sha1, &ctx); | |
240 | if (!idx) | |
241 | return 0; | |
242 | ||
243 | idx->crc32 = crc32_end(state->f); | |
244 | if (already_written(state, result_sha1)) { | |
245 | sha1file_truncate(state->f, &checkpoint); | |
246 | state->offset = checkpoint.offset; | |
247 | free(idx); | |
248 | } else { | |
e6a492b7 | 249 | hashcpy(idx->oid.hash, result_sha1); |
568508e7 JH |
250 | ALLOC_GROW(state->written, |
251 | state->nr_written + 1, | |
252 | state->alloc_written); | |
253 | state->written[state->nr_written++] = idx; | |
254 | } | |
255 | return 0; | |
256 | } | |
257 | ||
258 | int index_bulk_checkin(unsigned char *sha1, | |
259 | int fd, size_t size, enum object_type type, | |
260 | const char *path, unsigned flags) | |
261 | { | |
262 | int status = deflate_to_pack(&state, sha1, fd, size, type, | |
263 | path, flags); | |
264 | if (!state.plugged) | |
265 | finish_bulk_checkin(&state); | |
266 | return status; | |
267 | } | |
268 | ||
269 | void plug_bulk_checkin(void) | |
270 | { | |
271 | state.plugged = 1; | |
272 | } | |
273 | ||
274 | void unplug_bulk_checkin(void) | |
275 | { | |
276 | state.plugged = 0; | |
277 | if (state.f) | |
278 | finish_bulk_checkin(&state); | |
279 | } |