Update the merge scripts for the big git rename.
[git/git.git] / commit-tree.c
1 /*
2 * GIT - The information manager from hell
3 *
4 * Copyright (C) Linus Torvalds, 2005
5 */
6 #include "cache.h"
7
8 #include <pwd.h>
9 #include <time.h>
10 #include <string.h>
11 #include <ctype.h>
12 #include <time.h>
13
14 #define BLOCKING (1ul << 14)
15
16 /*
17 * FIXME! Share the code with "write-tree.c"
18 */
19 static void init_buffer(char **bufp, unsigned int *sizep)
20 {
21 char *buf = xmalloc(BLOCKING);
22 *sizep = 0;
23 *bufp = buf;
24 }
25
26 static void add_buffer(char **bufp, unsigned int *sizep, const char *fmt, ...)
27 {
28 char one_line[2048];
29 va_list args;
30 int len;
31 unsigned long alloc, size, newsize;
32 char *buf;
33
34 va_start(args, fmt);
35 len = vsnprintf(one_line, sizeof(one_line), fmt, args);
36 va_end(args);
37 size = *sizep;
38 newsize = size + len;
39 alloc = (size + 32767) & ~32767;
40 buf = *bufp;
41 if (newsize > alloc) {
42 alloc = (newsize + 32767) & ~32767;
43 buf = xrealloc(buf, alloc);
44 *bufp = buf;
45 }
46 *sizep = newsize;
47 memcpy(buf + size, one_line, len);
48 }
49
50 static void remove_special(char *p)
51 {
52 char c;
53 char *dst = p, *src = p;
54
55 for (;;) {
56 c = *src;
57 src++;
58 switch(c) {
59 case '\n': case '<': case '>':
60 continue;
61 }
62 *dst++ = c;
63 if (!c)
64 break;
65 }
66
67 /*
68 * Go back, and remove crud from the end: some people
69 * have commas etc in their gecos field
70 */
71 dst--;
72 while (--dst >= p) {
73 unsigned char c = *dst;
74 switch (c) {
75 case ',': case ';': case '.':
76 *dst = 0;
77 continue;
78 }
79 break;
80 }
81 }
82
83 static const char *month_names[] = {
84 "Jan", "Feb", "Mar", "Apr", "May", "Jun",
85 "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
86 };
87
88 static const char *weekday_names[] = {
89 "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"
90 };
91
92
93 static char *skipfws(char *str)
94 {
95 while (isspace(*str))
96 str++;
97 return str;
98 }
99
100
101 /* Gr. strptime is crap for this; it doesn't have a way to require RFC2822
102 (i.e. English) day/month names, and it doesn't work correctly with %z. */
103 static void parse_rfc2822_date(char *date, char *result, int maxlen)
104 {
105 struct tm tm;
106 char *p;
107 int i, offset;
108 time_t then;
109
110 memset(&tm, 0, sizeof(tm));
111
112 /* Skip day-name */
113 p = skipfws(date);
114 if (!isdigit(*p)) {
115 for (i=0; i<7; i++) {
116 if (!strncmp(p,weekday_names[i],3) && p[3] == ',') {
117 p = skipfws(p+4);
118 goto day;
119 }
120 }
121 return;
122 }
123
124 /* day */
125 day:
126 tm.tm_mday = strtoul(p, &p, 10);
127
128 if (tm.tm_mday < 1 || tm.tm_mday > 31)
129 return;
130
131 if (!isspace(*p))
132 return;
133
134 p = skipfws(p);
135
136 /* month */
137
138 for (i=0; i<12; i++) {
139 if (!strncmp(p, month_names[i], 3) && isspace(p[3])) {
140 tm.tm_mon = i;
141 p = skipfws(p+strlen(month_names[i]));
142 goto year;
143 }
144 }
145 return; /* Error -- bad month */
146
147 /* year */
148 year:
149 tm.tm_year = strtoul(p, &p, 10);
150
151 if (!tm.tm_year && !isspace(*p))
152 return;
153
154 if (tm.tm_year > 1900)
155 tm.tm_year -= 1900;
156
157 p=skipfws(p);
158
159 /* hour */
160 if (!isdigit(*p))
161 return;
162 tm.tm_hour = strtoul(p, &p, 10);
163
164 if (!tm.tm_hour > 23)
165 return;
166
167 if (*p != ':')
168 return; /* Error -- bad time */
169 p++;
170
171 /* minute */
172 if (!isdigit(*p))
173 return;
174 tm.tm_min = strtoul(p, &p, 10);
175
176 if (!tm.tm_min > 59)
177 return;
178
179 if (isspace(*p))
180 goto zone;
181
182 if (*p != ':')
183 return; /* Error -- bad time */
184 p++;
185
186 /* second */
187 if (!isdigit(*p))
188 return;
189 tm.tm_sec = strtoul(p, &p, 10);
190
191 if (!tm.tm_sec > 59)
192 return;
193
194 if (!isspace(*p))
195 return;
196
197 zone:
198 p = skipfws(p);
199
200 if (*p == '-')
201 offset = -60;
202 else if (*p == '+')
203 offset = 60;
204 else
205 return;
206
207 if (!isdigit(p[1]) || !isdigit(p[2]) || !isdigit(p[3]) || !isdigit(p[4]))
208 return;
209
210 i = strtoul(p+1, NULL, 10);
211 offset *= ((i % 100) + ((i / 100) * 60));
212
213 if (*(skipfws(p + 5)))
214 return;
215
216 then = mktime(&tm); /* mktime appears to ignore the GMT offset, stupidly */
217 if (then == -1)
218 return;
219
220 then -= offset;
221
222 snprintf(result, maxlen, "%lu %5.5s", then, p);
223 }
224
225 static void check_valid(unsigned char *sha1, const char *expect)
226 {
227 void *buf;
228 char type[20];
229 unsigned long size;
230
231 buf = read_sha1_file(sha1, type, &size);
232 if (!buf || strcmp(type, expect))
233 die("%s is not a valid '%s' object", sha1_to_hex(sha1), expect);
234 free(buf);
235 }
236
237 /*
238 * Having more than two parents is not strange at all, and this is
239 * how multi-way merges are represented.
240 */
241 #define MAXPARENT (16)
242
243 static char *commit_tree_usage = "commit-tree <sha1> [-p <sha1>]* < changelog";
244
245 int main(int argc, char **argv)
246 {
247 int i, len;
248 int parents = 0;
249 unsigned char tree_sha1[20];
250 unsigned char parent_sha1[MAXPARENT][20];
251 unsigned char commit_sha1[20];
252 char *gecos, *realgecos, *commitgecos;
253 char *email, *commitemail, realemail[1000];
254 char date[20], realdate[20];
255 char *audate;
256 char comment[1000];
257 struct passwd *pw;
258 time_t now;
259 struct tm *tm;
260 char *buffer;
261 unsigned int size;
262
263 if (argc < 2 || get_sha1_hex(argv[1], tree_sha1) < 0)
264 usage(commit_tree_usage);
265
266 check_valid(tree_sha1, "tree");
267 for (i = 2; i < argc; i += 2) {
268 char *a, *b;
269 a = argv[i]; b = argv[i+1];
270 if (!b || strcmp(a, "-p") || get_sha1_hex(b, parent_sha1[parents]))
271 usage(commit_tree_usage);
272 check_valid(parent_sha1[parents], "commit");
273 parents++;
274 }
275 if (!parents)
276 fprintf(stderr, "Committing initial tree %s\n", argv[1]);
277 pw = getpwuid(getuid());
278 if (!pw)
279 die("You don't exist. Go away!");
280 realgecos = pw->pw_gecos;
281 len = strlen(pw->pw_name);
282 memcpy(realemail, pw->pw_name, len);
283 realemail[len] = '@';
284 gethostname(realemail+len+1, sizeof(realemail)-len-1);
285 if (!strchr(realemail+len+1, '.')) {
286 strcat(realemail, ".");
287 getdomainname(realemail+strlen(realemail), sizeof(realemail)-strlen(realemail)-1);
288 }
289 time(&now);
290 tm = localtime(&now);
291
292 strftime(realdate, sizeof(realdate), "%s %z", tm);
293 strcpy(date, realdate);
294
295 commitgecos = getenv("COMMIT_AUTHOR_NAME") ? : realgecos;
296 commitemail = getenv("COMMIT_AUTHOR_EMAIL") ? : realemail;
297 gecos = getenv("AUTHOR_NAME") ? : realgecos;
298 email = getenv("AUTHOR_EMAIL") ? : realemail;
299 audate = getenv("AUTHOR_DATE");
300 if (audate)
301 parse_rfc2822_date(audate, date, sizeof(date));
302
303 remove_special(gecos); remove_special(realgecos); remove_special(commitgecos);
304 remove_special(email); remove_special(realemail); remove_special(commitemail);
305
306 init_buffer(&buffer, &size);
307 add_buffer(&buffer, &size, "tree %s\n", sha1_to_hex(tree_sha1));
308
309 /*
310 * NOTE! This ordering means that the same exact tree merged with a
311 * different order of parents will be a _different_ changeset even
312 * if everything else stays the same.
313 */
314 for (i = 0; i < parents; i++)
315 add_buffer(&buffer, &size, "parent %s\n", sha1_to_hex(parent_sha1[i]));
316
317 /* Person/date information */
318 add_buffer(&buffer, &size, "author %s <%s> %s\n", gecos, email, date);
319 add_buffer(&buffer, &size, "committer %s <%s> %s\n\n", commitgecos, commitemail, realdate);
320
321 /* And add the comment */
322 while (fgets(comment, sizeof(comment), stdin) != NULL)
323 add_buffer(&buffer, &size, "%s", comment);
324
325 write_sha1_file(buffer, size, "commit", commit_sha1);
326 printf("%s\n", sha1_to_hex(commit_sha1));
327 return 0;
328 }