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#include "strbuf.h"
  11
  12static const char git_mailsplit_usage[] =
  13"git mailsplit [-d<prec>] [-f<n>] [-b] [--keep-cr] -o<directory> [(<mbox>|<Maildir>)...]";
  14
  15static int is_from_line(const char *line, int len)
  16{
  17        const char *colon;
  18
  19        if (len < 20 || memcmp("From ", line, 5))
  20                return 0;
  21
  22        colon = line + len - 2;
  23        line += 5;
  24        for (;;) {
  25                if (colon < line)
  26                        return 0;
  27                if (*--colon == ':')
  28                        break;
  29        }
  30
  31        if (!isdigit(colon[-4]) ||
  32            !isdigit(colon[-2]) ||
  33            !isdigit(colon[-1]) ||
  34            !isdigit(colon[ 1]) ||
  35            !isdigit(colon[ 2]))
  36                return 0;
  37
  38        /* year */
  39        if (strtol(colon+3, NULL, 10) <= 90)
  40                return 0;
  41
  42        /* Ok, close enough */
  43        return 1;
  44}
  45
  46static struct strbuf buf = STRBUF_INIT;
  47static int keep_cr;
  48
  49/* Called with the first line (potentially partial)
  50 * already in buf[] -- normally that should begin with
  51 * the Unix "From " line.  Write it into the specified
  52 * file.
  53 */
  54static int split_one(FILE *mbox, const char *name, int allow_bare)
  55{
  56        FILE *output = NULL;
  57        int fd;
  58        int status = 0;
  59        int is_bare = !is_from_line(buf.buf, 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_errno("cannot open output file '%s'", name);
  67        output = xfdopen(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                if (!keep_cr && buf.len > 1 && buf.buf[buf.len-1] == '\n' &&
  74                        buf.buf[buf.len-2] == '\r') {
  75                        strbuf_setlen(&buf, buf.len-2);
  76                        strbuf_addch(&buf, '\n');
  77                }
  78
  79                if (fwrite(buf.buf, 1, buf.len, output) != buf.len)
  80                        die_errno("cannot write output");
  81
  82                if (strbuf_getwholeline(&buf, mbox, '\n')) {
  83                        if (feof(mbox)) {
  84                                status = 1;
  85                                break;
  86                        }
  87                        die_errno("cannot read mbox");
  88                }
  89                if (!is_bare && is_from_line(buf.buf, buf.len))
  90                        break; /* done with one message */
  91        }
  92        fclose(output);
  93        return status;
  94
  95 corrupt:
  96        if (output)
  97                fclose(output);
  98        unlink(name);
  99        fprintf(stderr, "corrupt mailbox\n");
 100        exit(1);
 101}
 102
 103static int populate_maildir_list(struct string_list *list, const char *path)
 104{
 105        DIR *dir;
 106        struct dirent *dent;
 107        char name[PATH_MAX];
 108        char *subs[] = { "cur", "new", NULL };
 109        char **sub;
 110
 111        for (sub = subs; *sub; ++sub) {
 112                snprintf(name, sizeof(name), "%s/%s", path, *sub);
 113                if ((dir = opendir(name)) == NULL) {
 114                        if (errno == ENOENT)
 115                                continue;
 116                        error("cannot opendir %s (%s)", name, strerror(errno));
 117                        return -1;
 118                }
 119
 120                while ((dent = readdir(dir)) != NULL) {
 121                        if (dent->d_name[0] == '.')
 122                                continue;
 123                        snprintf(name, sizeof(name), "%s/%s", *sub, dent->d_name);
 124                        string_list_insert(list, name);
 125                }
 126
 127                closedir(dir);
 128        }
 129
 130        return 0;
 131}
 132
 133static int maildir_filename_cmp(const char *a, const char *b)
 134{
 135        while (*a && *b) {
 136                if (isdigit(*a) && isdigit(*b)) {
 137                        long int na, nb;
 138                        na = strtol(a, (char **)&a, 10);
 139                        nb = strtol(b, (char **)&b, 10);
 140                        if (na != nb)
 141                                return na - nb;
 142                        /* strtol advanced our pointers */
 143                }
 144                else {
 145                        if (*a != *b)
 146                                return (unsigned char)*a - (unsigned char)*b;
 147                        a++;
 148                        b++;
 149                }
 150        }
 151        return (unsigned char)*a - (unsigned char)*b;
 152}
 153
 154static int split_maildir(const char *maildir, const char *dir,
 155        int nr_prec, int skip)
 156{
 157        char file[PATH_MAX];
 158        char name[PATH_MAX];
 159        int ret = -1;
 160        int i;
 161        struct string_list list = STRING_LIST_INIT_DUP;
 162
 163        list.cmp = maildir_filename_cmp;
 164
 165        if (populate_maildir_list(&list, maildir) < 0)
 166                goto out;
 167
 168        for (i = 0; i < list.nr; i++) {
 169                FILE *f;
 170                snprintf(file, sizeof(file), "%s/%s", maildir, list.items[i].string);
 171                f = fopen(file, "r");
 172                if (!f) {
 173                        error("cannot open mail %s (%s)", file, strerror(errno));
 174                        goto out;
 175                }
 176
 177                if (strbuf_getwholeline(&buf, f, '\n')) {
 178                        error("cannot read mail %s (%s)", file, strerror(errno));
 179                        goto out;
 180                }
 181
 182                sprintf(name, "%s/%0*d", dir, nr_prec, ++skip);
 183                split_one(f, name, 1);
 184
 185                fclose(f);
 186        }
 187
 188        ret = skip;
 189out:
 190        string_list_clear(&list, 1);
 191        return ret;
 192}
 193
 194static int split_mbox(const char *file, const char *dir, int allow_bare,
 195                      int nr_prec, int skip)
 196{
 197        char name[PATH_MAX];
 198        int ret = -1;
 199        int peek;
 200
 201        FILE *f = !strcmp(file, "-") ? stdin : fopen(file, "r");
 202        int file_done = 0;
 203
 204        if (!f) {
 205                error("cannot open mbox %s", file);
 206                goto out;
 207        }
 208
 209        do {
 210                peek = fgetc(f);
 211        } while (isspace(peek));
 212        ungetc(peek, f);
 213
 214        if (strbuf_getwholeline(&buf, f, '\n')) {
 215                /* empty stdin is OK */
 216                if (f != stdin) {
 217                        error("cannot read mbox %s", file);
 218                        goto out;
 219                }
 220                file_done = 1;
 221        }
 222
 223        while (!file_done) {
 224                sprintf(name, "%s/%0*d", dir, nr_prec, ++skip);
 225                file_done = split_one(f, name, allow_bare);
 226        }
 227
 228        if (f != stdin)
 229                fclose(f);
 230
 231        ret = skip;
 232out:
 233        return ret;
 234}
 235
 236int cmd_mailsplit(int argc, const char **argv, const char *prefix)
 237{
 238        int nr = 0, nr_prec = 4, num = 0;
 239        int allow_bare = 0;
 240        const char *dir = NULL;
 241        const char **argp;
 242        static const char *stdin_only[] = { "-", NULL };
 243
 244        for (argp = argv+1; *argp; argp++) {
 245                const char *arg = *argp;
 246
 247                if (arg[0] != '-')
 248                        break;
 249                /* do flags here */
 250                if ( arg[1] == 'd' ) {
 251                        nr_prec = strtol(arg+2, NULL, 10);
 252                        if (nr_prec < 3 || 10 <= nr_prec)
 253                                usage(git_mailsplit_usage);
 254                        continue;
 255                } else if ( arg[1] == 'f' ) {
 256                        nr = strtol(arg+2, NULL, 10);
 257                } else if ( arg[1] == 'h' ) {
 258                        usage(git_mailsplit_usage);
 259                } else if ( arg[1] == 'b' && !arg[2] ) {
 260                        allow_bare = 1;
 261                } else if (!strcmp(arg, "--keep-cr")) {
 262                        keep_cr = 1;
 263                } else if ( arg[1] == 'o' && arg[2] ) {
 264                        dir = arg+2;
 265                } else if ( arg[1] == '-' && !arg[2] ) {
 266                        argp++; /* -- marks end of options */
 267                        break;
 268                } else {
 269                        die("unknown option: %s", arg);
 270                }
 271        }
 272
 273        if ( !dir ) {
 274                /* Backwards compatibility: if no -o specified, accept
 275                   <mbox> <dir> or just <dir> */
 276                switch (argc - (argp-argv)) {
 277                case 1:
 278                        dir = argp[0];
 279                        argp = stdin_only;
 280                        break;
 281                case 2:
 282                        stdin_only[0] = argp[0];
 283                        dir = argp[1];
 284                        argp = stdin_only;
 285                        break;
 286                default:
 287                        usage(git_mailsplit_usage);
 288                }
 289        } else {
 290                /* New usage: if no more argument, parse stdin */
 291                if ( !*argp )
 292                        argp = stdin_only;
 293        }
 294
 295        while (*argp) {
 296                const char *arg = *argp++;
 297                struct stat argstat;
 298                int ret = 0;
 299
 300                if (arg[0] == '-' && arg[1] == 0) {
 301                        ret = split_mbox(arg, dir, allow_bare, nr_prec, nr);
 302                        if (ret < 0) {
 303                                error("cannot split patches from stdin");
 304                                return 1;
 305                        }
 306                        num += (ret - nr);
 307                        nr = ret;
 308                        continue;
 309                }
 310
 311                if (stat(arg, &argstat) == -1) {
 312                        error("cannot stat %s (%s)", arg, strerror(errno));
 313                        return 1;
 314                }
 315
 316                if (S_ISDIR(argstat.st_mode))
 317                        ret = split_maildir(arg, dir, nr_prec, nr);
 318                else
 319                        ret = split_mbox(arg, dir, allow_bare, nr_prec, nr);
 320
 321                if (ret < 0) {
 322                        error("cannot split patches from %s", arg);
 323                        return 1;
 324                }
 325                num += (ret - nr);
 326                nr = ret;
 327        }
 328
 329        printf("%d\n", num);
 330
 331        return 0;
 332}