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 #define ORIG_OFFSET (40)
  16
  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 }
  30
  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;
  38
  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 }
  54
  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 }
  64
  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;
  71
  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);
  78
  79         *bufp = buf;
  80         *sizep = size;
  81 }
  82
  83 static void remove_special(char *p)
  84 {
  85         char c;
  86         char *dst = p, *src = p;
  87
  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         }
  99
 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 }
 115
 116 static const char *month_names[] = {
 117         "Jan", "Feb", "Mar", "Apr", "May", "Jun",
 118         "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
 119 };
 120
 121 static const char *weekday_names[] = {
 122         "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"
 123 };
 124
 125
 126 static char *skipfws(char *str)
 127 {
 128         while (isspace(*str))
 129                 str++;
 130         return str;
 131 }
 132
 133
 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;
 142
 143         memset(&tm, 0, sizeof(tm));
 144
 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         }
 156
 157         /* day */
 158  day:
 159         tm.tm_mday = strtoul(p, &p, 10);
 160
 161         if (tm.tm_mday < 1 || tm.tm_mday > 31)
 162                 return;
 163
 164         if (!isspace(*p))
 165                 return;
 166
 167         p = skipfws(p);
 168
 169         /* month */
 170
 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 */
 179
 180         /* year */
 181  year:
 182         tm.tm_year = strtoul(p, &p, 10);
 183
 184         if (!tm.tm_year && !isspace(*p))
 185                 return;
 186
 187         if (tm.tm_year > 1900)
 188                 tm.tm_year -= 1900;
 189
 190         p=skipfws(p);
 191
 192         /* hour */
 193         if (!isdigit(*p))
 194                 return;
 195         tm.tm_hour = strtoul(p, &p, 10);
 196
 197         if (!tm.tm_hour > 23)
 198                 return;
 199
 200         if (*p != ':')
 201                 return; /* Error -- bad time */
 202         p++;
 203
 204         /* minute */
 205         if (!isdigit(*p))
 206                 return;
 207         tm.tm_min = strtoul(p, &p, 10);
 208
 209         if (!tm.tm_min > 59)
 210                 return;
 211
 212         if (isspace(*p))
 213                 goto zone;
 214
 215         if (*p != ':')
 216                 return; /* Error -- bad time */
 217         p++;
 218
 219         /* second */
 220         if (!isdigit(*p))
 221                 return;
 222         tm.tm_sec = strtoul(p, &p, 10);
 223
 224         if (!tm.tm_sec > 59)
 225                 return;
 226
 227         if (!isspace(*p))
 228                 return;
 229
 230  zone:
 231         p = skipfws(p);
 232
 233         if (*p == '-')
 234                 offset = -60;
 235         else if (*p == '+')
 236                 offset = 60;
 237         else
 238                return;
 239
 240         if (!isdigit(p[1]) || !isdigit(p[2]) || !isdigit(p[3]) || !isdigit(p[4]))
 241                 return;
 242
 243         i = strtoul(p+1, NULL, 10);
 244         offset *= ((i % 100) + ((i / 100) * 60));
 245
 246         if (*(skipfws(p + 5)))
 247                 return;
 248
 249         then = mktime(&tm); /* mktime appears to ignore the GMT offset, stupidly */
 250         if (then == -1)
 251                 return;
 252
 253         then -= offset;
 254
 255         snprintf(result, maxlen, "%lu %5.5s", then, p);
 256 }
 257
 258 static void check_valid(unsigned char *sha1, const char *expect)
 259 {
 260         void *buf;
 261         char type[20];
 262         unsigned long size;
 263
 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 }
 269
 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)
 275
 276 static char *commit_tree_usage = "commit-tree <sha1> [-p <sha1>]* < changelog";
 277
 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;
 295
 296         if (argc < 2 || get_sha1_hex(argv[1], tree_sha1) < 0)
 297                 usage(commit_tree_usage);
 298
 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);
 324
 325         strftime(realdate, sizeof(realdate), "%s %z", tm);
 326         strcpy(date, realdate);
 327
 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));
 335
 336         remove_special(gecos); remove_special(realgecos); remove_special(commitgecos);
 337         remove_special(email); remove_special(realemail); remove_special(commitemail);
 338
 339         init_buffer(&buffer, &size);
 340         add_buffer(&buffer, &size, "tree %s\n", sha1_to_hex(tree_sha1));
 341
 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]));
 349
 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);
 353
 354         /* And add the comment */
 355         while (fgets(comment, sizeof(comment), stdin) != NULL)
 356                 add_buffer(&buffer, &size, "%s", comment);
 357
 358         finish_buffer("commit ", &buffer, &size);
 359
 360         write_sha1_file(buffer, size, commit_sha1);
 361         printf("%s\n", sha1_to_hex(commit_sha1));
 362         return 0;
 363 }