Make use of stat.ctime configurable
[git/git.git] / archive.c
CommitLineData
18125644
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1#include "cache.h"
2#include "commit.h"
c0885435 3#include "tree-walk.h"
18125644 4#include "attr.h"
562e25ab 5#include "archive.h"
18125644 6
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7static const char archive_usage[] = \
8"git archive --format=<fmt> [--prefix=<prefix>/] [--verbose] [<extra>] <tree-ish> [path...]";
9
10#define USES_ZLIB_COMPRESSION 1
11
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12const struct archiver {
13 const char *name;
14 write_archive_fn_t write_archive;
15 unsigned int flags;
16} archivers[] = {
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17 { "tar", write_tar_archive },
18 { "zip", write_zip_archive, USES_ZLIB_COMPRESSION },
19};
20
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21static void format_subst(const struct commit *commit,
22 const char *src, size_t len,
23 struct strbuf *buf)
24{
25 char *to_free = NULL;
26 struct strbuf fmt;
27
28 if (src == buf->buf)
29 to_free = strbuf_detach(buf, NULL);
30 strbuf_init(&fmt, 0);
31 for (;;) {
32 const char *b, *c;
33
34 b = memmem(src, len, "$Format:", 8);
75b7dfbd 35 if (!b)
18125644 36 break;
75b7dfbd 37 c = memchr(b + 8, '$', (src + len) - b - 8);
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38 if (!c)
39 break;
40
41 strbuf_reset(&fmt);
42 strbuf_add(&fmt, b + 8, c - b - 8);
43
44 strbuf_add(buf, src, b - src);
45 format_commit_message(commit, fmt.buf, buf);
46 len -= c + 1 - src;
47 src = c + 1;
48 }
49 strbuf_add(buf, src, len);
50 strbuf_release(&fmt);
51 free(to_free);
52}
53
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54static void *sha1_file_to_archive(const char *path, const unsigned char *sha1,
55 unsigned int mode, enum object_type *type,
56 unsigned long *sizep, const struct commit *commit)
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57{
58 void *buffer;
59
60 buffer = read_sha1_file(sha1, type, sizep);
61 if (buffer && S_ISREG(mode)) {
62 struct strbuf buf;
63 size_t size = 0;
64
65 strbuf_init(&buf, 0);
66 strbuf_attach(&buf, buffer, *sizep, *sizep + 1);
67 convert_to_working_tree(path, buf.buf, buf.len, &buf);
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68 if (commit)
69 format_subst(commit, buf.buf, buf.len, &buf);
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70 buffer = strbuf_detach(&buf, &size);
71 *sizep = size;
72 }
73
74 return buffer;
75}
76
1d11d5bb 77static void setup_archive_check(struct git_attr_check *check)
008d896d
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78{
79 static struct git_attr *attr_export_ignore;
1d11d5bb 80 static struct git_attr *attr_export_subst;
008d896d 81
1d11d5bb 82 if (!attr_export_ignore) {
008d896d 83 attr_export_ignore = git_attr("export-ignore", 13);
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84 attr_export_subst = git_attr("export-subst", 12);
85 }
008d896d 86 check[0].attr = attr_export_ignore;
1d11d5bb 87 check[1].attr = attr_export_subst;
008d896d 88}
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89
90struct archiver_context {
91 struct archiver_args *args;
92 write_archive_entry_fn_t write_entry;
93};
94
95static int write_archive_entry(const unsigned char *sha1, const char *base,
96 int baselen, const char *filename, unsigned mode, int stage,
97 void *context)
98{
99 static struct strbuf path = STRBUF_INIT;
100 struct archiver_context *c = context;
101 struct archiver_args *args = c->args;
102 write_archive_entry_fn_t write_entry = c->write_entry;
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103 struct git_attr_check check[2];
104 const char *path_without_prefix;
105 int convert = 0;
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106 int err;
107 enum object_type type;
108 unsigned long size;
109 void *buffer;
110
111 strbuf_reset(&path);
112 strbuf_grow(&path, PATH_MAX);
113 strbuf_add(&path, base, baselen);
114 strbuf_addstr(&path, filename);
1d11d5bb 115 path_without_prefix = path.buf + args->baselen;
562e25ab 116
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117 setup_archive_check(check);
118 if (!git_checkattr(path_without_prefix, ARRAY_SIZE(check), check)) {
119 if (ATTR_TRUE(check[0].value))
120 return 0;
121 convert = ATTR_TRUE(check[1].value);
122 }
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123
124 if (S_ISDIR(mode) || S_ISGITLINK(mode)) {
125 strbuf_addch(&path, '/');
126 if (args->verbose)
127 fprintf(stderr, "%.*s\n", (int)path.len, path.buf);
128 err = write_entry(args, sha1, path.buf, path.len, mode, NULL, 0);
129 if (err)
130 return err;
131 return READ_TREE_RECURSIVE;
132 }
133
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134 buffer = sha1_file_to_archive(path_without_prefix, sha1, mode,
135 &type, &size, convert ? args->commit : NULL);
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136 if (!buffer)
137 return error("cannot read %s", sha1_to_hex(sha1));
138 if (args->verbose)
139 fprintf(stderr, "%.*s\n", (int)path.len, path.buf);
140 err = write_entry(args, sha1, path.buf, path.len, mode, buffer, size);
141 free(buffer);
142 return err;
143}
144
145int write_archive_entries(struct archiver_args *args,
146 write_archive_entry_fn_t write_entry)
147{
148 struct archiver_context context;
149 int err;
150
151 if (args->baselen > 0 && args->base[args->baselen - 1] == '/') {
152 size_t len = args->baselen;
153
154 while (len > 1 && args->base[len - 2] == '/')
155 len--;
156 if (args->verbose)
157 fprintf(stderr, "%.*s\n", (int)len, args->base);
158 err = write_entry(args, args->tree->object.sha1, args->base,
159 len, 040777, NULL, 0);
160 if (err)
161 return err;
162 }
163
164 context.args = args;
165 context.write_entry = write_entry;
166
167 err = read_tree_recursive(args->tree, args->base, args->baselen, 0,
168 args->pathspec, write_archive_entry, &context);
169 if (err == READ_TREE_RECURSIVE)
170 err = 0;
171 return err;
172}
6e94e683 173
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174static const struct archiver *lookup_archiver(const char *name)
175{
176 int i;
177
178 for (i = 0; i < ARRAY_SIZE(archivers); i++) {
179 if (!strcmp(name, archivers[i].name))
180 return &archivers[i];
181 }
182 return NULL;
183}
184
185static void parse_pathspec_arg(const char **pathspec,
186 struct archiver_args *ar_args)
187{
188 ar_args->pathspec = get_pathspec(ar_args->base, pathspec);
189}
190
191static void parse_treeish_arg(const char **argv,
192 struct archiver_args *ar_args, const char *prefix)
193{
194 const char *name = argv[0];
195 const unsigned char *commit_sha1;
196 time_t archive_time;
197 struct tree *tree;
198 const struct commit *commit;
199 unsigned char sha1[20];
200
201 if (get_sha1(name, sha1))
202 die("Not a valid object name");
203
204 commit = lookup_commit_reference_gently(sha1, 1);
205 if (commit) {
206 commit_sha1 = commit->object.sha1;
207 archive_time = commit->date;
208 } else {
209 commit_sha1 = NULL;
210 archive_time = time(NULL);
211 }
212
213 tree = parse_tree_indirect(sha1);
214 if (tree == NULL)
215 die("not a tree object");
216
217 if (prefix) {
218 unsigned char tree_sha1[20];
219 unsigned int mode;
220 int err;
221
222 err = get_tree_entry(tree->object.sha1, prefix,
223 tree_sha1, &mode);
224 if (err || !S_ISDIR(mode))
225 die("current working directory is untracked");
226
227 tree = parse_tree_indirect(tree_sha1);
228 }
229 ar_args->tree = tree;
230 ar_args->commit_sha1 = commit_sha1;
231 ar_args->commit = commit;
232 ar_args->time = archive_time;
233}
234
235static int parse_archive_args(int argc, const char **argv,
236 const struct archiver **ar, struct archiver_args *args)
237{
238 const char *format = "tar";
239 const char *base = "";
240 int compression_level = -1;
241 int verbose = 0;
242 int i;
243
244 for (i = 1; i < argc; i++) {
245 const char *arg = argv[i];
246
247 if (!strcmp(arg, "--list") || !strcmp(arg, "-l")) {
248 for (i = 0; i < ARRAY_SIZE(archivers); i++)
249 printf("%s\n", archivers[i].name);
250 exit(0);
251 }
252 if (!strcmp(arg, "--verbose") || !strcmp(arg, "-v")) {
253 verbose = 1;
254 continue;
255 }
256 if (!prefixcmp(arg, "--format=")) {
257 format = arg + 9;
258 continue;
259 }
260 if (!prefixcmp(arg, "--prefix=")) {
261 base = arg + 9;
262 continue;
263 }
264 if (!strcmp(arg, "--")) {
265 i++;
266 break;
267 }
268 if (arg[0] == '-' && isdigit(arg[1]) && arg[2] == '\0') {
269 compression_level = arg[1] - '0';
270 continue;
271 }
272 if (arg[0] == '-')
273 die("Unknown argument: %s", arg);
274 break;
275 }
276
277 /* We need at least one parameter -- tree-ish */
278 if (argc - 1 < i)
279 usage(archive_usage);
280 *ar = lookup_archiver(format);
281 if (!*ar)
282 die("Unknown archive format '%s'", format);
283
284 args->compression_level = Z_DEFAULT_COMPRESSION;
285 if (compression_level != -1) {
286 if ((*ar)->flags & USES_ZLIB_COMPRESSION)
287 args->compression_level = compression_level;
288 else {
289 die("Argument not supported for format '%s': -%d",
290 format, compression_level);
291 }
292 }
293 args->verbose = verbose;
294 args->base = base;
295 args->baselen = strlen(base);
296
297 return i;
298}
299
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300int write_archive(int argc, const char **argv, const char *prefix,
301 int setup_prefix)
302{
303 const struct archiver *ar = NULL;
304 struct archiver_args args;
305 int tree_idx;
306
307 tree_idx = parse_archive_args(argc, argv, &ar, &args);
308 if (setup_prefix && prefix == NULL)
309 prefix = setup_git_directory();
310
311 argv += tree_idx;
312 parse_treeish_arg(argv, &args, prefix);
313 parse_pathspec_arg(argv + 1, &args);
314
315 return ar->write_archive(&args);
316}