1 /*
2 * GIT - The information manager from hell
3 *
4 * Copyright (C) Linus Torvalds, 2005
5 */
6 #include "cache.h"
8 #include <pwd.h>
9 #include <time.h>
10 #include <string.h>
11 #include <ctype.h>
12 #include <time.h>
14 #define BLOCKING (1ul << 14)
15 #define ORIG_OFFSET (40)
17 /*
18 * Leave space at the beginning to insert the tag
19 * once we know how big things are.
20 *
21 * FIXME! Share the code with "write-tree.c"
22 */
23 static void init_buffer(char **bufp, unsigned int *sizep)
24 {
25 char *buf = malloc(BLOCKING);
26 memset(buf, 0, ORIG_OFFSET);
27 *sizep = ORIG_OFFSET;
28 *bufp = buf;
29 }
31 static void add_buffer(char **bufp, unsigned int *sizep, const char *fmt, ...)
32 {
33 char one_line[2048];
34 va_list args;
35 int len;
36 unsigned long alloc, size, newsize;
37 char *buf;
39 va_start(args, fmt);
40 len = vsnprintf(one_line, sizeof(one_line), fmt, args);
41 va_end(args);
42 size = *sizep;
43 newsize = size + len;
44 alloc = (size + 32767) & ~32767;
45 buf = *bufp;
46 if (newsize > alloc) {
47 alloc = (newsize + 32767) & ~32767;
48 buf = realloc(buf, alloc);
49 *bufp = buf;
50 }
51 *sizep = newsize;
52 memcpy(buf + size, one_line, len);
53 }
55 static int prepend_integer(char *buffer, unsigned val, int i)
56 {
57 buffer[--i] = '\0';
58 do {
59 buffer[--i] = '0' + (val % 10);
60 val /= 10;
61 } while (val);
62 return i;
63 }
65 static void finish_buffer(char *tag, char **bufp, unsigned int *sizep)
66 {
67 int taglen;
68 int offset;
69 char *buf = *bufp;
70 unsigned int size = *sizep;
72 offset = prepend_integer(buf, size - ORIG_OFFSET, ORIG_OFFSET);
73 taglen = strlen(tag);
74 offset -= taglen;
75 buf += offset;
76 size -= offset;
77 memcpy(buf, tag, taglen);
79 *bufp = buf;
80 *sizep = size;
81 }
83 static void remove_special(char *p)
84 {
85 char c;
86 char *dst = p, *src = p;
88 for (;;) {
89 c = *src;
90 src++;
91 switch(c) {
92 case '\n': case '<': case '>':
93 continue;
94 }
95 *dst++ = c;
96 if (!c)
97 break;
98 }
100 /*
101 * Go back, and remove crud from the end: some people
102 * have commas etc in their gecos field
103 */
104 dst--;
105 while (--dst >= p) {
106 unsigned char c = *dst;
107 switch (c) {
108 case ',': case ';': case '.':
109 *dst = 0;
110 continue;
111 }
112 break;
113 }
114 }
116 static const char *month_names[] = {
117 "Jan", "Feb", "Mar", "Apr", "May", "Jun",
118 "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
119 };
121 static const char *weekday_names[] = {
122 "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"
123 };
126 static char *skipfws(char *str)
127 {
128 while (isspace(*str))
129 str++;
130 return str;
131 }
134 /* Gr. strptime is crap for this; it doesn't have a way to require RFC2822
135 (i.e. English) day/month names, and it doesn't work correctly with %z. */
136 static void parse_rfc2822_date(char *date, char *result, int maxlen)
137 {
138 struct tm tm;
139 char *p;
140 int i, offset;
141 time_t then;
143 memset(&tm, 0, sizeof(tm));
145 /* Skip day-name */
146 p = skipfws(date);
147 if (!isdigit(*p)) {
148 for (i=0; i<7; i++) {
149 if (!strncmp(p,weekday_names[i],3) && p[3] == ',') {
150 p = skipfws(p+4);
151 goto day;
152 }
153 }
154 return;
155 }
157 /* day */
158 day:
159 tm.tm_mday = strtoul(p, &p, 10);
161 if (tm.tm_mday < 1 || tm.tm_mday > 31)
162 return;
164 if (!isspace(*p))
165 return;
167 p = skipfws(p);
169 /* month */
171 for (i=0; i<12; i++) {
172 if (!strncmp(p, month_names[i], 3) && isspace(p[3])) {
173 tm.tm_mon = i;
174 p = skipfws(p+strlen(month_names[i]));
175 goto year;
176 }
177 }
178 return; /* Error -- bad month */
180 /* year */
181 year:
182 tm.tm_year = strtoul(p, &p, 10);
184 if (!tm.tm_year && !isspace(*p))
185 return;
187 if (tm.tm_year > 1900)
188 tm.tm_year -= 1900;
190 p=skipfws(p);
192 /* hour */
193 if (!isdigit(*p))
194 return;
195 tm.tm_hour = strtoul(p, &p, 10);
197 if (!tm.tm_hour > 23)
198 return;
200 if (*p != ':')
201 return; /* Error -- bad time */
202 p++;
204 /* minute */
205 if (!isdigit(*p))
206 return;
207 tm.tm_min = strtoul(p, &p, 10);
209 if (!tm.tm_min > 59)
210 return;
212 if (isspace(*p))
213 goto zone;
215 if (*p != ':')
216 return; /* Error -- bad time */
217 p++;
219 /* second */
220 if (!isdigit(*p))
221 return;
222 tm.tm_sec = strtoul(p, &p, 10);
224 if (!tm.tm_sec > 59)
225 return;
227 if (!isspace(*p))
228 return;
230 zone:
231 p = skipfws(p);
233 if (*p == '-')
234 offset = -60;
235 else if (*p == '+')
236 offset = 60;
237 else
238 return;
240 if (!isdigit(p[1]) || !isdigit(p[2]) || !isdigit(p[3]) || !isdigit(p[4]))
241 return;
243 i = strtoul(p+1, NULL, 10);
244 offset *= ((i % 100) + ((i / 100) * 60));
246 if (*(skipfws(p + 5)))
247 return;
249 then = mktime(&tm); /* mktime appears to ignore the GMT offset, stupidly */
250 if (then == -1)
251 return;
253 then -= offset;
255 snprintf(result, maxlen, "%lu %5.5s", then, p);
256 }
258 static void check_valid(unsigned char *sha1, const char *expect)
259 {
260 void *buf;
261 char type[20];
262 unsigned long size;
264 buf = read_sha1_file(sha1, type, &size);
265 if (!buf || strcmp(type, expect))
266 die("%s is not a valid '%s' object", sha1_to_hex(sha1), expect);
267 free(buf);
268 }
270 /*
271 * Having more than two parents is not strange at all, and this is
272 * how multi-way merges are represented.
273 */
274 #define MAXPARENT (16)
276 static char *commit_tree_usage = "commit-tree <sha1> [-p <sha1>]* < changelog";
278 int main(int argc, char **argv)
279 {
280 int i, len;
281 int parents = 0;
282 unsigned char tree_sha1[20];
283 unsigned char parent_sha1[MAXPARENT][20];
284 unsigned char commit_sha1[20];
285 char *gecos, *realgecos, *commitgecos;
286 char *email, *commitemail, realemail[1000];
287 char date[20], realdate[20];
288 char *audate;
289 char comment[1000];
290 struct passwd *pw;
291 time_t now;
292 struct tm *tm;
293 char *buffer;
294 unsigned int size;
296 if (argc < 2 || get_sha1_hex(argv[1], tree_sha1) < 0)
297 usage(commit_tree_usage);
299 check_valid(tree_sha1, "tree");
300 for (i = 2; i < argc; i += 2) {
301 char *a, *b;
302 a = argv[i]; b = argv[i+1];
303 if (!b || strcmp(a, "-p") || get_sha1_hex(b, parent_sha1[parents]))
304 usage(commit_tree_usage);
305 check_valid(parent_sha1[parents], "commit");
306 parents++;
307 }
308 if (!parents)
309 fprintf(stderr, "Committing initial tree %s\n", argv[1]);
310 pw = getpwuid(getuid());
311 if (!pw)
312 die("You don't exist. Go away!");
313 realgecos = pw->pw_gecos;
314 len = strlen(pw->pw_name);
315 memcpy(realemail, pw->pw_name, len);
316 realemail[len] = '@';
317 gethostname(realemail+len+1, sizeof(realemail)-len-1);
318 if (!strchr(realemail+len+1, '.')) {
319 strcat(realemail, ".");
320 getdomainname(realemail+strlen(realemail), sizeof(realemail)-strlen(realemail)-1);
321 }
322 time(&now);
323 tm = localtime(&now);
325 strftime(realdate, sizeof(realdate), "%s %z", tm);
326 strcpy(date, realdate);
328 commitgecos = getenv("COMMIT_AUTHOR_NAME") ? : realgecos;
329 commitemail = getenv("COMMIT_AUTHOR_EMAIL") ? : realemail;
330 gecos = getenv("AUTHOR_NAME") ? : realgecos;
331 email = getenv("AUTHOR_EMAIL") ? : realemail;
332 audate = getenv("AUTHOR_DATE");
333 if (audate)
334 parse_rfc2822_date(audate, date, sizeof(date));
336 remove_special(gecos); remove_special(realgecos); remove_special(commitgecos);
337 remove_special(email); remove_special(realemail); remove_special(commitemail);
339 init_buffer(&buffer, &size);
340 add_buffer(&buffer, &size, "tree %s\n", sha1_to_hex(tree_sha1));
342 /*
343 * NOTE! This ordering means that the same exact tree merged with a
344 * different order of parents will be a _different_ changeset even
345 * if everything else stays the same.
346 */
347 for (i = 0; i < parents; i++)
348 add_buffer(&buffer, &size, "parent %s\n", sha1_to_hex(parent_sha1[i]));
350 /* Person/date information */
351 add_buffer(&buffer, &size, "author %s <%s> %s\n", gecos, email, date);
352 add_buffer(&buffer, &size, "committer %s <%s> %s\n\n", commitgecos, commitemail, realdate);
354 /* And add the comment */
355 while (fgets(comment, sizeof(comment), stdin) != NULL)
356 add_buffer(&buffer, &size, "%s", comment);
358 finish_buffer("commit ", &buffer, &size);
360 write_sha1_file(buffer, size, commit_sha1);
361 printf("%s\n", sha1_to_hex(commit_sha1));
362 return 0;
363 }