1/*
2 * Copyright (c) 2006 Franck Bui-Huu
3 * Copyright (c) 2006 Rene Scharfe
4 */
5#include <time.h>
6#include "cache.h"
7#include "builtin.h"
8#include "archive.h"
9#include "commit.h"
10#include "tree-walk.h"
11#include "exec_cmd.h"
12#include "pkt-line.h"
13#include "sideband.h"
14
15static const char archive_usage[] = \
16"git-archive --format=<fmt> [--prefix=<prefix>/] [--verbose] [<extra>] <tree-ish> [path...]";
17
18static struct archiver_desc
19{
20 const char *name;
21 write_archive_fn_t write_archive;
22 parse_extra_args_fn_t parse_extra;
23} archivers[] = {
24 { "tar", write_tar_archive, NULL },
25 { "zip", write_zip_archive, parse_extra_zip_args },
26};
27
28static int run_remote_archiver(const char *remote, int argc,
29 const char **argv)
30{
31 char *url, buf[LARGE_PACKET_MAX];
32 int fd[2], i, len, rv;
33 pid_t pid;
34 const char *exec = "git-upload-archive";
35 int exec_at = 0;
36
37 for (i = 1; i < argc; i++) {
38 const char *arg = argv[i];
39 if (!strncmp("--exec=", arg, 7)) {
40 if (exec_at)
41 die("multiple --exec specified");
42 exec = arg + 7;
43 exec_at = i;
44 break;
45 }
46 }
47
48 url = xstrdup(remote);
49 pid = git_connect(fd, url, exec);
50 if (pid < 0)
51 return pid;
52
53 for (i = 1; i < argc; i++) {
54 if (i == exec_at)
55 continue;
56 packet_write(fd[1], "argument %s\n", argv[i]);
57 }
58 packet_flush(fd[1]);
59
60 len = packet_read_line(fd[0], buf, sizeof(buf));
61 if (!len)
62 die("git-archive: expected ACK/NAK, got EOF");
63 if (buf[len-1] == '\n')
64 buf[--len] = 0;
65 if (strcmp(buf, "ACK")) {
66 if (len > 5 && !strncmp(buf, "NACK ", 5))
67 die("git-archive: NACK %s", buf + 5);
68 die("git-archive: protocol error");
69 }
70
71 len = packet_read_line(fd[0], buf, sizeof(buf));
72 if (len)
73 die("git-archive: expected a flush");
74
75 /* Now, start reading from fd[0] and spit it out to stdout */
76 rv = recv_sideband("archive", fd[0], 1, 2);
77 close(fd[0]);
78 rv |= finish_connect(pid);
79
80 return !!rv;
81}
82
83static int init_archiver(const char *name, struct archiver *ar)
84{
85 int rv = -1, i;
86
87 for (i = 0; i < ARRAY_SIZE(archivers); i++) {
88 if (!strcmp(name, archivers[i].name)) {
89 memset(ar, 0, sizeof(*ar));
90 ar->name = archivers[i].name;
91 ar->write_archive = archivers[i].write_archive;
92 ar->parse_extra = archivers[i].parse_extra;
93 rv = 0;
94 break;
95 }
96 }
97 return rv;
98}
99
100void parse_pathspec_arg(const char **pathspec, struct archiver_args *ar_args)
101{
102 ar_args->pathspec = get_pathspec(ar_args->base, pathspec);
103}
104
105void parse_treeish_arg(const char **argv, struct archiver_args *ar_args,
106 const char *prefix)
107{
108 const char *name = argv[0];
109 const unsigned char *commit_sha1;
110 time_t archive_time;
111 struct tree *tree;
112 struct commit *commit;
113 unsigned char sha1[20];
114
115 if (get_sha1(name, sha1))
116 die("Not a valid object name");
117
118 commit = lookup_commit_reference_gently(sha1, 1);
119 if (commit) {
120 commit_sha1 = commit->object.sha1;
121 archive_time = commit->date;
122 } else {
123 commit_sha1 = NULL;
124 archive_time = time(NULL);
125 }
126
127 tree = parse_tree_indirect(sha1);
128 if (tree == NULL)
129 die("not a tree object");
130
131 if (prefix) {
132 unsigned char tree_sha1[20];
133 unsigned int mode;
134 int err;
135
136 err = get_tree_entry(tree->object.sha1, prefix,
137 tree_sha1, &mode);
138 if (err || !S_ISDIR(mode))
139 die("current working directory is untracked");
140
141 free(tree);
142 tree = parse_tree_indirect(tree_sha1);
143 }
144 ar_args->tree = tree;
145 ar_args->commit_sha1 = commit_sha1;
146 ar_args->time = archive_time;
147}
148
149int parse_archive_args(int argc, const char **argv, struct archiver *ar)
150{
151 const char *extra_argv[MAX_EXTRA_ARGS];
152 int extra_argc = 0;
153 const char *format = NULL; /* might want to default to "tar" */
154 const char *base = "";
155 int verbose = 0;
156 int i;
157
158 for (i = 1; i < argc; i++) {
159 const char *arg = argv[i];
160
161 if (!strcmp(arg, "--list") || !strcmp(arg, "-l")) {
162 for (i = 0; i < ARRAY_SIZE(archivers); i++)
163 printf("%s\n", archivers[i].name);
164 exit(0);
165 }
166 if (!strcmp(arg, "--verbose") || !strcmp(arg, "-v")) {
167 verbose = 1;
168 continue;
169 }
170 if (!strncmp(arg, "--format=", 9)) {
171 format = arg + 9;
172 continue;
173 }
174 if (!strncmp(arg, "--prefix=", 9)) {
175 base = arg + 9;
176 continue;
177 }
178 if (!strcmp(arg, "--")) {
179 i++;
180 break;
181 }
182 if (arg[0] == '-') {
183 if (extra_argc > MAX_EXTRA_ARGS - 1)
184 die("Too many extra options");
185 extra_argv[extra_argc++] = arg;
186 continue;
187 }
188 break;
189 }
190
191 /* We need at least one parameter -- tree-ish */
192 if (argc - 1 < i)
193 usage(archive_usage);
194 if (!format)
195 die("You must specify an archive format");
196 if (init_archiver(format, ar) < 0)
197 die("Unknown archive format '%s'", format);
198
199 if (extra_argc) {
200 if (!ar->parse_extra)
201 die("'%s' format does not handle %s",
202 ar->name, extra_argv[0]);
203 ar->args.extra = ar->parse_extra(extra_argc, extra_argv);
204 }
205 ar->args.verbose = verbose;
206 ar->args.base = base;
207
208 return i;
209}
210
211static const char *extract_remote_arg(int *ac, const char **av)
212{
213 int ix, iy, cnt = *ac;
214 int no_more_options = 0;
215 const char *remote = NULL;
216
217 for (ix = iy = 1; ix < cnt; ix++) {
218 const char *arg = av[ix];
219 if (!strcmp(arg, "--"))
220 no_more_options = 1;
221 if (!no_more_options) {
222 if (!strncmp(arg, "--remote=", 9)) {
223 if (remote)
224 die("Multiple --remote specified");
225 remote = arg + 9;
226 continue;
227 }
228 if (arg[0] != '-')
229 no_more_options = 1;
230 }
231 if (ix != iy)
232 av[iy] = arg;
233 iy++;
234 }
235 if (remote) {
236 av[--cnt] = NULL;
237 *ac = cnt;
238 }
239 return remote;
240}
241
242int cmd_archive(int argc, const char **argv, const char *prefix)
243{
244 struct archiver ar;
245 int tree_idx;
246 const char *remote = NULL;
247
248 remote = extract_remote_arg(&argc, argv);
249 if (remote)
250 return run_remote_archiver(remote, argc, argv);
251
252 setlinebuf(stderr);
253
254 memset(&ar, 0, sizeof(ar));
255 tree_idx = parse_archive_args(argc, argv, &ar);
256 if (prefix == NULL)
257 prefix = setup_git_directory();
258
259 argv += tree_idx;
260 parse_treeish_arg(argv, &ar.args, prefix);
261 parse_pathspec_arg(argv + 1, &ar.args);
262
263 return ar.write_archive(&ar.args);
264}