summaryrefslogtreecommitdiff
path: root/builtin/cat-file.c
blob: c27268ff30ab0e818b56f3e0a3ab56028083c6c1 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
/*
 * GIT - The information manager from hell
 *
 * Copyright (C) Linus Torvalds, 2005
 */
#include "cache.h"
#include "exec_cmd.h"
#include "tag.h"
#include "tree.h"
#include "builtin.h"
#include "parse-options.h"
#include "diff.h"
#include "userdiff.h"
 
#define BATCH 1
#define BATCH_CHECK 2
 
static void pprint_tag(const unsigned char *sha1, const char *buf, unsigned long size)
{
	/* the parser in tag.c is useless here. */
	const char *endp = buf + size;
	const char *cp = buf;
 
	while (cp < endp) {
		char c = *cp++;
		if (c != '\n')
			continue;
		if (7 <= endp - cp && !memcmp("tagger ", cp, 7)) {
			const char *tagger = cp;
 
			/* Found the tagger line.  Copy out the contents
			 * of the buffer so far.
			 */
			write_or_die(1, buf, cp - buf);
 
			/*
			 * Do something intelligent, like pretty-printing
			 * the date.
			 */
			while (cp < endp) {
				if (*cp++ == '\n') {
					/* tagger to cp is a line
					 * that has ident and time.
					 */
					const char *sp = tagger;
					char *ep;
					unsigned long date;
					long tz;
					while (sp < cp && *sp != '>')
						sp++;
					if (sp == cp) {
						/* give up */
						write_or_die(1, tagger,
							     cp - tagger);
						break;
					}
					while (sp < cp &&
					       !('0' <= *sp && *sp <= '9'))
						sp++;
					write_or_die(1, tagger, sp - tagger);
					date = strtoul(sp, &ep, 10);
					tz = strtol(ep, NULL, 10);
					sp = show_date(date, tz, 0);
					write_or_die(1, sp, strlen(sp));
					xwrite(1, "\n", 1);
					break;
				}
			}
			break;
		}
		if (cp < endp && *cp == '\n')
			/* end of header */
			break;
	}
	/* At this point, we have copied out the header up to the end of
	 * the tagger line and cp points at one past \n.  It could be the
	 * next header line after the tagger line, or it could be another
	 * \n that marks the end of the headers.  We need to copy out the
	 * remainder as is.
	 */
	if (cp < endp)
		write_or_die(1, cp, endp - cp);
}
 
static int cat_one_file(int opt, const char *exp_type, const char *obj_name)
{
	unsigned char sha1[20];
	enum object_type type;
	char *buf;
	unsigned long size;
	struct object_context obj_context;
 
	if (get_sha1_with_context(obj_name, 0, sha1, &obj_context))
		die("Not a valid object name %s", obj_name);
 
	buf = NULL;
	switch (opt) {
	case 't':
		type = sha1_object_info(sha1, NULL);
		if (type > 0) {
			printf("%s\n", typename(type));
			return 0;
		}
		break;
 
	case 's':
		type = sha1_object_info(sha1, &size);
		if (type > 0) {
			printf("%lu\n", size);
			return 0;
		}
		break;
 
	case 'e':
		return !has_sha1_file(sha1);
 
	case 'p':
		type = sha1_object_info(sha1, NULL);
		if (type < 0)
			die("Not a valid object name %s", obj_name);
 
		/* custom pretty-print here */
		if (type == OBJ_TREE) {
			const char *ls_args[3] = { NULL };
			ls_args[0] =  "ls-tree";
			ls_args[1] =  obj_name;
			return cmd_ls_tree(2, ls_args, NULL);
		}
 
		buf = read_sha1_file(sha1, &type, &size);
		if (!buf)
			die("Cannot read object %s", obj_name);
		if (type == OBJ_TAG) {
			pprint_tag(sha1, buf, size);
			return 0;
		}
 
		/* otherwise just spit out the data */
		break;
 
	case 'c':
		if (!obj_context.path[0])
			die("git cat-file --textconv %s: <object> must be <sha1:path>",
			    obj_name);
 
		if (!textconv_object(obj_context.path, obj_context.mode, sha1, &buf, &size))
			die("git cat-file --textconv: unable to run textconv on %s",
			    obj_name);
		break;
 
	case 0:
		buf = read_object_with_reference(sha1, exp_type, &size, NULL);
		break;
 
	default:
		die("git cat-file: unknown option: %s", exp_type);
	}
 
	if (!buf)
		die("git cat-file %s: bad file", obj_name);
 
	write_or_die(1, buf, size);
	return 0;
}
 
static int batch_one_object(const char *obj_name, int print_contents)
{
	unsigned char sha1[20];
	enum object_type type = 0;
	unsigned long size;
	void *contents = contents;
 
	if (!obj_name)
	   return 1;
 
	if (get_sha1(obj_name, sha1)) {
		printf("%s missing\n", obj_name);
		fflush(stdout);
		return 0;
	}
 
	if (print_contents == BATCH)
		contents = read_sha1_file(sha1, &type, &size);
	else
		type = sha1_object_info(sha1, &size);
 
	if (type <= 0) {
		printf("%s missing\n", obj_name);
		fflush(stdout);
		if (print_contents == BATCH)
			free(contents);
		return 0;
	}
 
	printf("%s %s %lu\n", sha1_to_hex(sha1), typename(type), size);
	fflush(stdout);
 
	if (print_contents == BATCH) {
		write_or_die(1, contents, size);
		printf("\n");
		fflush(stdout);
		free(contents);
	}
 
	return 0;
}
 
static int batch_objects(int print_contents)
{
	struct strbuf buf = STRBUF_INIT;
 
	while (strbuf_getline(&buf, stdin, '\n') != EOF) {
		int error = batch_one_object(buf.buf, print_contents);
		if (error)
			return error;
	}
 
	return 0;
}
 
static const char * const cat_file_usage[] = {
	"git cat-file (-t|-s|-e|-p|<type>|--textconv) <object>",
	"git cat-file (--batch|--batch-check) < <list_of_objects>",
	NULL
};
 
static int git_cat_file_config(const char *var, const char *value, void *cb)
{
	switch (userdiff_config(var, value)) {
	case 0:
		break;
	case -1:
		return -1;
	default:
		return 0;
	}
 
	return git_default_config(var, value, cb);
}
 
int cmd_cat_file(int argc, const char **argv, const char *prefix)
{
	int opt = 0, batch = 0;
	const char *exp_type = NULL, *obj_name = NULL;
 
	const struct option options[] = {
		OPT_GROUP("<type> can be one of: blob, tree, commit, tag"),
		OPT_SET_INT('t', NULL, &opt, "show object type", 't'),
		OPT_SET_INT('s', NULL, &opt, "show object size", 's'),
		OPT_SET_INT('e', NULL, &opt,
			    "exit with zero when there's no error", 'e'),
		OPT_SET_INT('p', NULL, &opt, "pretty-print object's content", 'p'),
		OPT_SET_INT(0, "textconv", &opt,
			    "for blob objects, run textconv on object's content", 'c'),
		OPT_SET_INT(0, "batch", &batch,
			    "show info and content of objects fed from the standard input",
			    BATCH),
		OPT_SET_INT(0, "batch-check", &batch,
			    "show info about objects fed from the standard input",
			    BATCH_CHECK),
		OPT_END()
	};
 
	git_config(git_cat_file_config, NULL);
 
	if (argc != 3 && argc != 2)
		usage_with_options(cat_file_usage, options);
 
	argc = parse_options(argc, argv, prefix, options, cat_file_usage, 0);
 
	if (opt) {
		if (argc == 1)
			obj_name = argv[0];
		else
			usage_with_options(cat_file_usage, options);
	}
	if (!opt && !batch) {
		if (argc == 2) {
			exp_type = argv[0];
			obj_name = argv[1];
		} else
			usage_with_options(cat_file_usage, options);
	}
	if (batch && (opt || argc)) {
		usage_with_options(cat_file_usage, options);
	}
 
	if (batch)
		return batch_objects(batch);
 
	return cat_one_file(opt, exp_type, obj_name);
}