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