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;
  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                unlink(name);
  63                fprintf(stderr, "corrupt mailbox\n");
  64                exit(1);
  65        }
  66        fd = open(name, O_WRONLY | O_CREAT | O_EXCL, 0666);
  67        if (fd < 0)
  68                die_errno("cannot open output file '%s'", name);
  69        output = xfdopen(fd, "w");
  70
  71        /* Copy it out, while searching for a line that begins with
  72         * "From " and having something that looks like a date format.
  73         */
  74        for (;;) {
  75                if (!keep_cr && buf.len > 1 && buf.buf[buf.len-1] == '\n' &&
  76                        buf.buf[buf.len-2] == '\r') {
  77                        strbuf_setlen(&buf, buf.len-2);
  78                        strbuf_addch(&buf, '\n');
  79                }
  80
  81                if (fwrite(buf.buf, 1, buf.len, output) != buf.len)
  82                        die_errno("cannot write output");
  83
  84                if (strbuf_getwholeline(&buf, mbox, '\n')) {
  85                        if (feof(mbox)) {
  86                                status = 1;
  87                                break;
  88                        }
  89                        die_errno("cannot read mbox");
  90                }
  91                if (!is_bare && is_from_line(buf.buf, buf.len))
  92                        break; /* done with one message */
  93        }
  94        fclose(output);
  95        return status;
  96}
  97
  98static int populate_maildir_list(struct string_list *list, const char *path)
  99{
 100        DIR *dir;
 101        struct dirent *dent;
 102        char name[PATH_MAX];
 103        char *subs[] = { "cur", "new", NULL };
 104        char **sub;
 105
 106        for (sub = subs; *sub; ++sub) {
 107                snprintf(name, sizeof(name), "%s/%s", path, *sub);
 108                if ((dir = opendir(name)) == NULL) {
 109                        if (errno == ENOENT)
 110                                continue;
 111                        error("cannot opendir %s (%s)", name, strerror(errno));
 112                        return -1;
 113                }
 114
 115                while ((dent = readdir(dir)) != NULL) {
 116                        if (dent->d_name[0] == '.')
 117                                continue;
 118                        snprintf(name, sizeof(name), "%s/%s", *sub, dent->d_name);
 119                        string_list_insert(list, name);
 120                }
 121
 122                closedir(dir);
 123        }
 124
 125        return 0;
 126}
 127
 128static int maildir_filename_cmp(const char *a, const char *b)
 129{
 130        while (*a && *b) {
 131                if (isdigit(*a) && isdigit(*b)) {
 132                        long int na, nb;
 133                        na = strtol(a, (char **)&a, 10);
 134                        nb = strtol(b, (char **)&b, 10);
 135                        if (na != nb)
 136                                return na - nb;
 137                        /* strtol advanced our pointers */
 138                }
 139                else {
 140                        if (*a != *b)
 141                                return (unsigned char)*a - (unsigned char)*b;
 142                        a++;
 143                        b++;
 144                }
 145        }
 146        return (unsigned char)*a - (unsigned char)*b;
 147}
 148
 149static int split_maildir(const char *maildir, const char *dir,
 150        int nr_prec, int skip)
 151{
 152        char file[PATH_MAX];
 153        char name[PATH_MAX];
 154        int ret = -1;
 155        int i;
 156        struct string_list list = STRING_LIST_INIT_DUP;
 157
 158        list.cmp = maildir_filename_cmp;
 159
 160        if (populate_maildir_list(&list, maildir) < 0)
 161                goto out;
 162
 163        for (i = 0; i < list.nr; i++) {
 164                FILE *f;
 165                snprintf(file, sizeof(file), "%s/%s", maildir, list.items[i].string);
 166                f = fopen(file, "r");
 167                if (!f) {
 168                        error("cannot open mail %s (%s)", file, strerror(errno));
 169                        goto out;
 170                }
 171
 172                if (strbuf_getwholeline(&buf, f, '\n')) {
 173                        error("cannot read mail %s (%s)", file, strerror(errno));
 174                        goto out;
 175                }
 176
 177                sprintf(name, "%s/%0*d", dir, nr_prec, ++skip);
 178                split_one(f, name, 1);
 179
 180                fclose(f);
 181        }
 182
 183        ret = skip;
 184out:
 185        string_list_clear(&list, 1);
 186        return ret;
 187}
 188
 189static int split_mbox(const char *file, const char *dir, int allow_bare,
 190                      int nr_prec, int skip)
 191{
 192        char name[PATH_MAX];
 193        int ret = -1;
 194        int peek;
 195
 196        FILE *f = !strcmp(file, "-") ? stdin : fopen(file, "r");
 197        int file_done = 0;
 198
 199        if (!f) {
 200                error("cannot open mbox %s", file);
 201                goto out;
 202        }
 203
 204        do {
 205                peek = fgetc(f);
 206        } while (isspace(peek));
 207        ungetc(peek, f);
 208
 209        if (strbuf_getwholeline(&buf, f, '\n')) {
 210                /* empty stdin is OK */
 211                if (f != stdin) {
 212                        error("cannot read mbox %s", file);
 213                        goto out;
 214                }
 215                file_done = 1;
 216        }
 217
 218        while (!file_done) {
 219                sprintf(name, "%s/%0*d", dir, nr_prec, ++skip);
 220                file_done = split_one(f, name, allow_bare);
 221        }
 222
 223        if (f != stdin)
 224                fclose(f);
 225
 226        ret = skip;
 227out:
 228        return ret;
 229}
 230
 231int cmd_mailsplit(int argc, const char **argv, const char *prefix)
 232{
 233        int nr = 0, nr_prec = 4, num = 0;
 234        int allow_bare = 0;
 235        const char *dir = NULL;
 236        const char **argp;
 237        static const char *stdin_only[] = { "-", NULL };
 238
 239        for (argp = argv+1; *argp; argp++) {
 240                const char *arg = *argp;
 241
 242                if (arg[0] != '-')
 243                        break;
 244                /* do flags here */
 245                if ( arg[1] == 'd' ) {
 246                        nr_prec = strtol(arg+2, NULL, 10);
 247                        if (nr_prec < 3 || 10 <= nr_prec)
 248                                usage(git_mailsplit_usage);
 249                        continue;
 250                } else if ( arg[1] == 'f' ) {
 251                        nr = strtol(arg+2, NULL, 10);
 252                } else if ( arg[1] == 'h' ) {
 253                        usage(git_mailsplit_usage);
 254                } else if ( arg[1] == 'b' && !arg[2] ) {
 255                        allow_bare = 1;
 256                } else if (!strcmp(arg, "--keep-cr")) {
 257                        keep_cr = 1;
 258                } else if ( arg[1] == 'o' && arg[2] ) {
 259                        dir = arg+2;
 260                } else if ( arg[1] == '-' && !arg[2] ) {
 261                        argp++; /* -- marks end of options */
 262                        break;
 263                } else {
 264                        die("unknown option: %s", arg);
 265                }
 266        }
 267
 268        if ( !dir ) {
 269                /* Backwards compatibility: if no -o specified, accept
 270                   <mbox> <dir> or just <dir> */
 271                switch (argc - (argp-argv)) {
 272                case 1:
 273                        dir = argp[0];
 274                        argp = stdin_only;
 275                        break;
 276                case 2:
 277                        stdin_only[0] = argp[0];
 278                        dir = argp[1];
 279                        argp = stdin_only;
 280                        break;
 281                default:
 282                        usage(git_mailsplit_usage);
 283                }
 284        } else {
 285                /* New usage: if no more argument, parse stdin */
 286                if ( !*argp )
 287                        argp = stdin_only;
 288        }
 289
 290        while (*argp) {
 291                const char *arg = *argp++;
 292                struct stat argstat;
 293                int ret = 0;
 294
 295                if (arg[0] == '-' && arg[1] == 0) {
 296                        ret = split_mbox(arg, dir, allow_bare, nr_prec, nr);
 297                        if (ret < 0) {
 298                                error("cannot split patches from stdin");
 299                                return 1;
 300                        }
 301                        num += (ret - nr);
 302                        nr = ret;
 303                        continue;
 304                }
 305
 306                if (stat(arg, &argstat) == -1) {
 307                        error("cannot stat %s (%s)", arg, strerror(errno));
 308                        return 1;
 309                }
 310
 311                if (S_ISDIR(argstat.st_mode))
 312                        ret = split_maildir(arg, dir, nr_prec, nr);
 313                else
 314                        ret = split_mbox(arg, dir, allow_bare, nr_prec, nr);
 315
 316                if (ret < 0) {
 317                        error("cannot split patches from %s", arg);
 318                        return 1;
 319                }
 320                num += (ret - nr);
 321                nr = ret;
 322        }
 323
 324        printf("%d\n", num);
 325
 326        return 0;
 327}