builtin-mailsplit.c

   1 /*
   2  * Totally braindamaged mbox splitter program.
   3  *
   4  * It just splits a mbox into a list of files: "0001" "0002" ..
   5  * so you can process them further from there.
   6  */
   7 #include "cache.h"
   8 #include "builtin.h"
   9 #include "path-list.h"
  10
  11 static const char git_mailsplit_usage[] =
  12 "git-mailsplit [-d<prec>] [-f<n>] [-b] -o<directory> <mbox>|<Maildir>...";
  13
  14 static int is_from_line(const char *line, int len)
  15 {
  16         const char *colon;
  17
  18         if (len < 20 || memcmp("From ", line, 5))
  19                 return 0;
  20
  21         colon = line + len - 2;
  22         line += 5;
  23         for (;;) {
  24                 if (colon < line)
  25                         return 0;
  26                 if (*--colon == ':')
  27                         break;
  28         }
  29
  30         if (!isdigit(colon[-4]) ||
  31             !isdigit(colon[-2]) ||
  32             !isdigit(colon[-1]) ||
  33             !isdigit(colon[ 1]) ||
  34             !isdigit(colon[ 2]))
  35                 return 0;
  36
  37         /* year */
  38         if (strtol(colon+3, NULL, 10) <= 90)
  39                 return 0;
  40
  41         /* Ok, close enough */
  42         return 1;
  43 }
  44
  45 /* Could be as small as 64, enough to hold a Unix "From " line. */
  46 static char buf[4096];
  47
  48 /* Called with the first line (potentially partial)
  49  * already in buf[] -- normally that should begin with
  50  * the Unix "From " line.  Write it into the specified
  51  * file.
  52  */
  53 static int split_one(FILE *mbox, const char *name, int allow_bare)
  54 {
  55         FILE *output = NULL;
  56         int len = strlen(buf);
  57         int fd;
  58         int status = 0;
  59         int is_bare = !is_from_line(buf, len);
  60
  61         if (is_bare && !allow_bare)
  62                 goto corrupt;
  63
  64         fd = open(name, O_WRONLY | O_CREAT | O_EXCL, 0666);
  65         if (fd < 0)
  66                 die("cannot open output file %s", name);
  67         output = fdopen(fd, "w");
  68
  69         /* Copy it out, while searching for a line that begins with
  70          * "From " and having something that looks like a date format.
  71          */
  72         for (;;) {
  73                 int is_partial = (buf[len-1] != '\n');
  74
  75                 if (fputs(buf, output) == EOF)
  76                         die("cannot write output");
  77
  78                 if (fgets(buf, sizeof(buf), mbox) == NULL) {
  79                         if (feof(mbox)) {
  80                                 status = 1;
  81                                 break;
  82                         }
  83                         die("cannot read mbox");
  84                 }
  85                 len = strlen(buf);
  86                 if (!is_partial && !is_bare && is_from_line(buf, len))
  87                         break; /* done with one message */
  88         }
  89         fclose(output);
  90         return status;
  91
  92  corrupt:
  93         if (output)
  94                 fclose(output);
  95         unlink(name);
  96         fprintf(stderr, "corrupt mailbox\n");
  97         exit(1);
  98 }
  99
 100 static int populate_maildir_list(struct path_list *list, const char *path)
 101 {
 102         DIR *dir;
 103         struct dirent *dent;
 104         char name[PATH_MAX];
 105         char *subs[] = { "cur", "new", NULL };
 106         char **sub;
 107
 108         for (sub = subs; *sub; ++sub) {
 109                 snprintf(name, sizeof(name), "%s/%s", path, *sub);
 110                 if ((dir = opendir(name)) == NULL) {
 111                         if (errno == ENOENT)
 112                                 continue;
 113                         error("cannot opendir %s (%s)", name, strerror(errno));
 114                         return -1;
 115                 }
 116
 117                 while ((dent = readdir(dir)) != NULL) {
 118                         if (dent->d_name[0] == '.')
 119                                 continue;
 120                         snprintf(name, sizeof(name), "%s/%s", *sub, dent->d_name);
 121                         path_list_insert(name, list);
 122                 }
 123
 124                 closedir(dir);
 125         }
 126
 127         return 0;
 128 }
 129
 130 static int split_maildir(const char *maildir, const char *dir,
 131         int nr_prec, int skip)
 132 {
 133         char file[PATH_MAX];
 134         char name[PATH_MAX];
 135         int ret = -1;
 136         int i;
 137         struct path_list list = {NULL, 0, 0, 1};
 138
 139         if (populate_maildir_list(&list, maildir) < 0)
 140                 goto out;
 141
 142         for (i = 0; i < list.nr; i++) {
 143                 FILE *f;
 144                 snprintf(file, sizeof(file), "%s/%s", maildir, list.items[i].path);
 145                 f = fopen(file, "r");
 146                 if (!f) {
 147                         error("cannot open mail %s (%s)", file, strerror(errno));
 148                         goto out;
 149                 }
 150
 151                 if (fgets(buf, sizeof(buf), f) == NULL) {
 152                         error("cannot read mail %s (%s)", file, strerror(errno));
 153                         goto out;
 154                 }
 155
 156                 sprintf(name, "%s/%0*d", dir, nr_prec, ++skip);
 157                 split_one(f, name, 1);
 158
 159                 fclose(f);
 160         }
 161
 162         ret = skip;
 163 out:
 164         path_list_clear(&list, 1);
 165         return ret;
 166 }
 167
 168 static int split_mbox(const char *file, const char *dir, int allow_bare,
 169                       int nr_prec, int skip)
 170 {
 171         char name[PATH_MAX];
 172         int ret = -1;
 173         int peek;
 174
 175         FILE *f = !strcmp(file, "-") ? stdin : fopen(file, "r");
 176         int file_done = 0;
 177
 178         if (!f) {
 179                 error("cannot open mbox %s", file);
 180                 goto out;
 181         }
 182
 183         do {
 184                 peek = fgetc(f);
 185         } while (isspace(peek));
 186         ungetc(peek, f);
 187
 188         if (fgets(buf, sizeof(buf), f) == NULL) {
 189                 /* empty stdin is OK */
 190                 if (f != stdin) {
 191                         error("cannot read mbox %s", file);
 192                         goto out;
 193                 }
 194                 file_done = 1;
 195         }
 196
 197         while (!file_done) {
 198                 sprintf(name, "%s/%0*d", dir, nr_prec, ++skip);
 199                 file_done = split_one(f, name, allow_bare);
 200         }
 201
 202         if (f != stdin)
 203                 fclose(f);
 204
 205         ret = skip;
 206 out:
 207         return ret;
 208 }
 209
 210 int cmd_mailsplit(int argc, const char **argv, const char *prefix)
 211 {
 212         int nr = 0, nr_prec = 4, num = 0;
 213         int allow_bare = 0;
 214         const char *dir = NULL;
 215         const char **argp;
 216         static const char *stdin_only[] = { "-", NULL };
 217
 218         for (argp = argv+1; *argp; argp++) {
 219                 const char *arg = *argp;
 220
 221                 if (arg[0] != '-')
 222                         break;
 223                 /* do flags here */
 224                 if ( arg[1] == 'd' ) {
 225                         nr_prec = strtol(arg+2, NULL, 10);
 226                         if (nr_prec < 3 || 10 <= nr_prec)
 227                                 usage(git_mailsplit_usage);
 228                         continue;
 229                 } else if ( arg[1] == 'f' ) {
 230                         nr = strtol(arg+2, NULL, 10);
 231                 } else if ( arg[1] == 'b' && !arg[2] ) {
 232                         allow_bare = 1;
 233                 } else if ( arg[1] == 'o' && arg[2] ) {
 234                         dir = arg+2;
 235                 } else if ( arg[1] == '-' && !arg[2] ) {
 236                         argp++; /* -- marks end of options */
 237                         break;
 238                 } else {
 239                         die("unknown option: %s", arg);
 240                 }
 241         }
 242
 243         if ( !dir ) {
 244                 /* Backwards compatibility: if no -o specified, accept
 245                    <mbox> <dir> or just <dir> */
 246                 switch (argc - (argp-argv)) {
 247                 case 1:
 248                         dir = argp[0];
 249                         argp = stdin_only;
 250                         break;
 251                 case 2:
 252                         stdin_only[0] = argp[0];
 253                         dir = argp[1];
 254                         argp = stdin_only;
 255                         break;
 256                 default:
 257                         usage(git_mailsplit_usage);
 258                 }
 259         } else {
 260                 /* New usage: if no more argument, parse stdin */
 261                 if ( !*argp )
 262                         argp = stdin_only;
 263         }
 264
 265         while (*argp) {
 266                 const char *arg = *argp++;
 267                 struct stat argstat;
 268                 int ret = 0;
 269
 270                 if (arg[0] == '-' && arg[1] == 0) {
 271                         ret = split_mbox(arg, dir, allow_bare, nr_prec, nr);
 272                         if (ret < 0) {
 273                                 error("cannot split patches from stdin");
 274                                 return 1;
 275                         }
 276                         num += (ret - nr);
 277                         nr = ret;
 278                         continue;
 279                 }
 280
 281                 if (stat(arg, &argstat) == -1) {
 282                         error("cannot stat %s (%s)", arg, strerror(errno));
 283                         return 1;
 284                 }
 285
 286                 if (S_ISDIR(argstat.st_mode))
 287                         ret = split_maildir(arg, dir, nr_prec, nr);
 288                 else
 289                         ret = split_mbox(arg, dir, allow_bare, nr_prec, nr);
 290
 291                 if (ret < 0) {
 292                         error("cannot split patches from %s", arg);
 293                         return 1;
 294                 }
 295                 num += (ret - nr);
 296                 nr = ret;
 297         }
 298
 299         printf("%d\n", num);
 300
 301         return 0;
 302 }