t/helper: ignore only executable files
[git/git.git] / bulk-checkin.c
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568508e7
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1/*
2 * Copyright (c) 2011, Google Inc.
3 */
1c4b6604 4#include "cache.h"
568508e7 5#include "bulk-checkin.h"
a49d2834 6#include "repository.h"
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7#include "csum-file.h"
8#include "pack.h"
58892711 9#include "strbuf.h"
0abe14f6 10#include "packfile.h"
cbd53a21 11#include "object-store.h"
568508e7 12
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13static struct bulk_checkin_state {
14 unsigned plugged:1;
15
16 char *pack_tmp_name;
98a3beab 17 struct hashfile *f;
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18 off_t offset;
19 struct pack_idx_option pack_idx_opts;
20
21 struct pack_idx_entry **written;
22 uint32_t alloc_written;
23 uint32_t nr_written;
24} state;
25
26static void finish_bulk_checkin(struct bulk_checkin_state *state)
27{
fa33c3aa 28 struct object_id oid;
58892711 29 struct strbuf packname = STRBUF_INIT;
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30 int i;
31
32 if (!state->f)
33 return;
34
35 if (state->nr_written == 0) {
36 close(state->f->fd);
37 unlink(state->pack_tmp_name);
38 goto clear_exit;
39 } else if (state->nr_written == 1) {
cfe83216 40 finalize_hashfile(state->f, oid.hash, CSUM_HASH_IN_STREAM | CSUM_FSYNC | CSUM_CLOSE);
568508e7 41 } else {
f2af9f5e 42 int fd = finalize_hashfile(state->f, oid.hash, 0);
fa33c3aa 43 fixup_pack_header_footer(fd, oid.hash, state->pack_tmp_name,
44 state->nr_written, oid.hash,
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45 state->offset);
46 close(fd);
47 }
48
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49 strbuf_addf(&packname, "%s/pack/pack-", get_object_directory());
50 finish_tmp_packfile(&packname, state->pack_tmp_name,
568508e7 51 state->written, state->nr_written,
fa33c3aa 52 &state->pack_idx_opts, oid.hash);
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53 for (i = 0; i < state->nr_written; i++)
54 free(state->written[i]);
55
56clear_exit:
57 free(state->written);
58 memset(state, 0, sizeof(*state));
59
58892711 60 strbuf_release(&packname);
568508e7 61 /* Make objects we just wrote available to ourselves */
a49d2834 62 reprepare_packed_git(the_repository);
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63}
64
68ee6dfc 65static int already_written(struct bulk_checkin_state *state, struct object_id *oid)
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66{
67 int i;
68
69 /* The object may already exist in the repository */
98374a07 70 if (has_object_file(oid))
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71 return 1;
72
73 /* Might want to keep the list sorted */
74 for (i = 0; i < state->nr_written; i++)
4a7e27e9 75 if (oideq(&state->written[i]->oid, oid))
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76 return 1;
77
78 /* This is a new object we need to keep */
79 return 0;
80}
81
82/*
83 * Read the contents from fd for size bytes, streaming it to the
84 * packfile in state while updating the hash in ctx. Signal a failure
85 * by returning a negative value when the resulting pack would exceed
86 * the pack size limit and this is not the first object in the pack,
87 * so that the caller can discard what we wrote from the current pack
88 * by truncating it and opening a new one. The caller will then call
89 * us again after rewinding the input fd.
90 *
91 * The already_hashed_to pointer is kept untouched by the caller to
92 * make sure we do not hash the same byte when we are called
93 * again. This way, the caller does not have to checkpoint its hash
94 * status before calling us just in case we ask it to call us again
95 * with a new pack.
96 */
97static int stream_to_pack(struct bulk_checkin_state *state,
f87e8137 98 git_hash_ctx *ctx, off_t *already_hashed_to,
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99 int fd, size_t size, enum object_type type,
100 const char *path, unsigned flags)
101{
102 git_zstream s;
103 unsigned char obuf[16384];
104 unsigned hdrlen;
105 int status = Z_OK;
106 int write_object = (flags & HASH_WRITE_OBJECT);
107 off_t offset = 0;
108
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109 git_deflate_init(&s, pack_compression_level);
110
7202a6fa 111 hdrlen = encode_in_pack_object_header(obuf, sizeof(obuf), type, size);
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112 s.next_out = obuf + hdrlen;
113 s.avail_out = sizeof(obuf) - hdrlen;
114
115 while (status != Z_STREAM_END) {
116 unsigned char ibuf[16384];
117
118 if (size && !s.avail_in) {
119 ssize_t rsize = size < sizeof(ibuf) ? size : sizeof(ibuf);
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120 ssize_t read_result = read_in_full(fd, ibuf, rsize);
121 if (read_result < 0)
122 die_errno("failed to read from '%s'", path);
123 if (read_result != rsize)
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124 die("failed to read %d bytes from '%s'",
125 (int)rsize, path);
126 offset += rsize;
127 if (*already_hashed_to < offset) {
128 size_t hsize = offset - *already_hashed_to;
129 if (rsize < hsize)
130 hsize = rsize;
131 if (hsize)
f87e8137 132 the_hash_algo->update_fn(ctx, ibuf, hsize);
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133 *already_hashed_to = offset;
134 }
135 s.next_in = ibuf;
136 s.avail_in = rsize;
137 size -= rsize;
138 }
139
140 status = git_deflate(&s, size ? 0 : Z_FINISH);
141
142 if (!s.avail_out || status == Z_STREAM_END) {
143 if (write_object) {
144 size_t written = s.next_out - obuf;
145
146 /* would we bust the size limit? */
147 if (state->nr_written &&
148 pack_size_limit_cfg &&
149 pack_size_limit_cfg < state->offset + written) {
150 git_deflate_abort(&s);
151 return -1;
152 }
153
98a3beab 154 hashwrite(state->f, obuf, written);
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155 state->offset += written;
156 }
157 s.next_out = obuf;
158 s.avail_out = sizeof(obuf);
159 }
160
161 switch (status) {
162 case Z_OK:
163 case Z_BUF_ERROR:
164 case Z_STREAM_END:
165 continue;
166 default:
167 die("unexpected deflate failure: %d", status);
168 }
169 }
170 git_deflate_end(&s);
171 return 0;
172}
173
174/* Lazily create backing packfile for the state */
175static void prepare_to_stream(struct bulk_checkin_state *state,
176 unsigned flags)
177{
178 if (!(flags & HASH_WRITE_OBJECT) || state->f)
179 return;
180
181 state->f = create_tmp_packfile(&state->pack_tmp_name);
182 reset_pack_idx_option(&state->pack_idx_opts);
183
184 /* Pretend we are going to write only one object */
185 state->offset = write_pack_header(state->f, 1);
186 if (!state->offset)
187 die_errno("unable to write pack header");
188}
189
190static int deflate_to_pack(struct bulk_checkin_state *state,
68ee6dfc 191 struct object_id *result_oid,
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192 int fd, size_t size,
193 enum object_type type, const char *path,
194 unsigned flags)
195{
196 off_t seekback, already_hashed_to;
f87e8137 197 git_hash_ctx ctx;
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198 unsigned char obuf[16384];
199 unsigned header_len;
98a3beab 200 struct hashfile_checkpoint checkpoint;
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201 struct pack_idx_entry *idx = NULL;
202
203 seekback = lseek(fd, 0, SEEK_CUR);
204 if (seekback == (off_t) -1)
205 return error("cannot find the current offset");
206
ef1286d3 207 header_len = xsnprintf((char *)obuf, sizeof(obuf), "%s %" PRIuMAX,
debca9d2 208 type_name(type), (uintmax_t)size) + 1;
f87e8137 209 the_hash_algo->init_fn(&ctx);
210 the_hash_algo->update_fn(&ctx, obuf, header_len);
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211
212 /* Note: idx is non-NULL when we are writing */
213 if ((flags & HASH_WRITE_OBJECT) != 0)
214 idx = xcalloc(1, sizeof(*idx));
215
216 already_hashed_to = 0;
217
218 while (1) {
219 prepare_to_stream(state, flags);
220 if (idx) {
98a3beab 221 hashfile_checkpoint(state->f, &checkpoint);
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222 idx->offset = state->offset;
223 crc32_begin(state->f);
224 }
225 if (!stream_to_pack(state, &ctx, &already_hashed_to,
226 fd, size, type, path, flags))
227 break;
228 /*
229 * Writing this object to the current pack will make
230 * it too big; we need to truncate it, start a new
231 * pack, and write into it.
232 */
233 if (!idx)
033abf97 234 BUG("should not happen");
98a3beab 235 hashfile_truncate(state->f, &checkpoint);
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236 state->offset = checkpoint.offset;
237 finish_bulk_checkin(state);
238 if (lseek(fd, seekback, SEEK_SET) == (off_t) -1)
239 return error("cannot seek back");
240 }
68ee6dfc 241 the_hash_algo->final_fn(result_oid->hash, &ctx);
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242 if (!idx)
243 return 0;
244
245 idx->crc32 = crc32_end(state->f);
68ee6dfc 246 if (already_written(state, result_oid)) {
98a3beab 247 hashfile_truncate(state->f, &checkpoint);
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248 state->offset = checkpoint.offset;
249 free(idx);
250 } else {
68ee6dfc 251 oidcpy(&idx->oid, result_oid);
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252 ALLOC_GROW(state->written,
253 state->nr_written + 1,
254 state->alloc_written);
255 state->written[state->nr_written++] = idx;
256 }
257 return 0;
258}
259
68ee6dfc 260int index_bulk_checkin(struct object_id *oid,
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261 int fd, size_t size, enum object_type type,
262 const char *path, unsigned flags)
263{
68ee6dfc 264 int status = deflate_to_pack(&state, oid, fd, size, type,
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265 path, flags);
266 if (!state.plugged)
267 finish_bulk_checkin(&state);
268 return status;
269}
270
271void plug_bulk_checkin(void)
272{
273 state.plugged = 1;
274}
275
276void unplug_bulk_checkin(void)
277{
278 state.plugged = 0;
279 if (state.f)
280 finish_bulk_checkin(&state);
281}