Andrew's git - gitweb.git/blob - 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 "string-list.h"
  10
  11static const char git_mailsplit_usage[] =
  12"git mailsplit [-d<prec>] [-f<n>] [-b] -o<directory> [<mbox>|<Maildir>...]";
  13
  14static 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. */
  46static char buf[4096];
  47
  48/* We cannot use fgets() because our lines can contain NULs */
  49int read_line_with_nul(char *buf, int size, FILE *in)
  50{
  51        int len = 0, c;
  52
  53        for (;;) {
  54                c = getc(in);
  55                if (c == EOF)
  56                        break;
  57                buf[len++] = c;
  58                if (c == '\n' || len + 1 >= size)
  59                        break;
  60        }
  61        buf[len] = '\0';
  62
  63        return len;
  64}
  65
  66/* Called with the first line (potentially partial)
  67 * already in buf[] -- normally that should begin with
  68 * the Unix "From " line.  Write it into the specified
  69 * file.
  70 */
  71static int split_one(FILE *mbox, const char *name, int allow_bare)
  72{
  73        FILE *output = NULL;
  74        int len = strlen(buf);
  75        int fd;
  76        int status = 0;
  77        int is_bare = !is_from_line(buf, len);
  78
  79        if (is_bare && !allow_bare)
  80                goto corrupt;
  81
  82        fd = open(name, O_WRONLY | O_CREAT | O_EXCL, 0666);
  83        if (fd < 0)
  84                die("cannot open output file %s", name);
  85        output = fdopen(fd, "w");
  86
  87        /* Copy it out, while searching for a line that begins with
  88         * "From " and having something that looks like a date format.
  89         */
  90        for (;;) {
  91                int is_partial = len && buf[len-1] != '\n';
  92
  93                if (fwrite(buf, 1, len, output) != len)
  94                        die("cannot write output");
  95
  96                len = read_line_with_nul(buf, sizeof(buf), mbox);
  97                if (len == 0) {
  98                        if (feof(mbox)) {
  99                                status = 1;
 100                                break;
 101                        }
 102                        die("cannot read mbox");
 103                }
 104                if (!is_partial && !is_bare && is_from_line(buf, len))
 105                        break; /* done with one message */
 106        }
 107        fclose(output);
 108        return status;
 109
 110 corrupt:
 111        if (output)
 112                fclose(output);
 113        unlink(name);
 114        fprintf(stderr, "corrupt mailbox\n");
 115        exit(1);
 116}
 117
 118static int populate_maildir_list(struct string_list *list, const char *path)
 119{
 120        DIR *dir;
 121        struct dirent *dent;
 122        char name[PATH_MAX];
 123        char *subs[] = { "cur", "new", NULL };
 124        char **sub;
 125
 126        for (sub = subs; *sub; ++sub) {
 127                snprintf(name, sizeof(name), "%s/%s", path, *sub);
 128                if ((dir = opendir(name)) == NULL) {
 129                        if (errno == ENOENT)
 130                                continue;
 131                        error("cannot opendir %s (%s)", name, strerror(errno));
 132                        return -1;
 133                }
 134
 135                while ((dent = readdir(dir)) != NULL) {
 136                        if (dent->d_name[0] == '.')
 137                                continue;
 138                        snprintf(name, sizeof(name), "%s/%s", *sub, dent->d_name);
 139                        string_list_insert(name, list);
 140                }
 141
 142                closedir(dir);
 143        }
 144
 145        return 0;
 146}
 147
 148static int split_maildir(const char *maildir, const char *dir,
 149        int nr_prec, int skip)
 150{
 151        char file[PATH_MAX];
 152        char name[PATH_MAX];
 153        int ret = -1;
 154        int i;
 155        struct string_list list = {NULL, 0, 0, 1};
 156
 157        if (populate_maildir_list(&list, maildir) < 0)
 158                goto out;
 159
 160        for (i = 0; i < list.nr; i++) {
 161                FILE *f;
 162                snprintf(file, sizeof(file), "%s/%s", maildir, list.items[i].string);
 163                f = fopen(file, "r");
 164                if (!f) {
 165                        error("cannot open mail %s (%s)", file, strerror(errno));
 166                        goto out;
 167                }
 168
 169                if (fgets(buf, sizeof(buf), f) == NULL) {
 170                        error("cannot read mail %s (%s)", file, strerror(errno));
 171                        goto out;
 172                }
 173
 174                sprintf(name, "%s/%0*d", dir, nr_prec, ++skip);
 175                split_one(f, name, 1);
 176
 177                fclose(f);
 178        }
 179
 180        ret = skip;
 181out:
 182        string_list_clear(&list, 1);
 183        return ret;
 184}
 185
 186static int split_mbox(const char *file, const char *dir, int allow_bare,
 187                      int nr_prec, int skip)
 188{
 189        char name[PATH_MAX];
 190        int ret = -1;
 191        int peek;
 192
 193        FILE *f = !strcmp(file, "-") ? stdin : fopen(file, "r");
 194        int file_done = 0;
 195
 196        if (!f) {
 197                error("cannot open mbox %s", file);
 198                goto out;
 199        }
 200
 201        do {
 202                peek = fgetc(f);
 203        } while (isspace(peek));
 204        ungetc(peek, f);
 205
 206        if (fgets(buf, sizeof(buf), f) == NULL) {
 207                /* empty stdin is OK */
 208                if (f != stdin) {
 209                        error("cannot read mbox %s", file);
 210                        goto out;
 211                }
 212                file_done = 1;
 213        }
 214
 215        while (!file_done) {
 216                sprintf(name, "%s/%0*d", dir, nr_prec, ++skip);
 217                file_done = split_one(f, name, allow_bare);
 218        }
 219
 220        if (f != stdin)
 221                fclose(f);
 222
 223        ret = skip;
 224out:
 225        return ret;
 226}
 227
 228int cmd_mailsplit(int argc, const char **argv, const char *prefix)
 229{
 230        int nr = 0, nr_prec = 4, num = 0;
 231        int allow_bare = 0;
 232        const char *dir = NULL;
 233        const char **argp;
 234        static const char *stdin_only[] = { "-", NULL };
 235
 236        for (argp = argv+1; *argp; argp++) {
 237                const char *arg = *argp;
 238
 239                if (arg[0] != '-')
 240                        break;
 241                /* do flags here */
 242                if ( arg[1] == 'd' ) {
 243                        nr_prec = strtol(arg+2, NULL, 10);
 244                        if (nr_prec < 3 || 10 <= nr_prec)
 245                                usage(git_mailsplit_usage);
 246                        continue;
 247                } else if ( arg[1] == 'f' ) {
 248                        nr = strtol(arg+2, NULL, 10);
 249                } else if ( arg[1] == 'b' && !arg[2] ) {
 250                        allow_bare = 1;
 251                } else if ( arg[1] == 'o' && arg[2] ) {
 252                        dir = arg+2;
 253                } else if ( arg[1] == '-' && !arg[2] ) {
 254                        argp++; /* -- marks end of options */
 255                        break;
 256                } else {
 257                        die("unknown option: %s", arg);
 258                }
 259        }
 260
 261        if ( !dir ) {
 262                /* Backwards compatibility: if no -o specified, accept
 263                   <mbox> <dir> or just <dir> */
 264                switch (argc - (argp-argv)) {
 265                case 1:
 266                        dir = argp[0];
 267                        argp = stdin_only;
 268                        break;
 269                case 2:
 270                        stdin_only[0] = argp[0];
 271                        dir = argp[1];
 272                        argp = stdin_only;
 273                        break;
 274                default:
 275                        usage(git_mailsplit_usage);
 276                }
 277        } else {
 278                /* New usage: if no more argument, parse stdin */
 279                if ( !*argp )
 280                        argp = stdin_only;
 281        }
 282
 283        while (*argp) {
 284                const char *arg = *argp++;
 285                struct stat argstat;
 286                int ret = 0;
 287
 288                if (arg[0] == '-' && arg[1] == 0) {
 289                        ret = split_mbox(arg, dir, allow_bare, nr_prec, nr);
 290                        if (ret < 0) {
 291                                error("cannot split patches from stdin");
 292                                return 1;
 293                        }
 294                        num += (ret - nr);
 295                        nr = ret;
 296                        continue;
 297                }
 298
 299                if (stat(arg, &argstat) == -1) {
 300                        error("cannot stat %s (%s)", arg, strerror(errno));
 301                        return 1;
 302                }
 303
 304                if (S_ISDIR(argstat.st_mode))
 305                        ret = split_maildir(arg, dir, nr_prec, nr);
 306                else
 307                        ret = split_mbox(arg, dir, allow_bare, nr_prec, nr);
 308
 309                if (ret < 0) {
 310                        error("cannot split patches from %s", arg);
 311                        return 1;
 312                }
 313                num += (ret - nr);
 314                nr = ret;
 315        }
 316
 317        printf("%d\n", num);
 318
 319        return 0;
 320}