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 = malloc(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 = realloc(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 }