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 "path-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/* 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 */
  53static 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
 100static int populate_maildir_list(struct path_list *list, const char *path)
 101{
 102        DIR *dir;
 103        struct dirent *dent;
 104
 105        if ((dir = opendir(path)) == NULL) {
 106                error("cannot opendir %s (%s)", path, strerror(errno));
 107                return -1;
 108        }
 109
 110        while ((dent = readdir(dir)) != NULL) {
 111                if (dent->d_name[0] == '.')
 112                        continue;
 113                path_list_insert(dent->d_name, list);
 114        }
 115
 116        closedir(dir);
 117
 118        return 0;
 119}
 120
 121static int split_maildir(const char *maildir, const char *dir,
 122        int nr_prec, int skip)
 123{
 124        char file[PATH_MAX];
 125        char curdir[PATH_MAX];
 126        char name[PATH_MAX];
 127        int ret = -1;
 128        int i;
 129        struct path_list list = {NULL, 0, 0, 1};
 130
 131        snprintf(curdir, sizeof(curdir), "%s/cur", maildir);
 132        if (populate_maildir_list(&list, curdir) < 0)
 133                goto out;
 134
 135        for (i = 0; i < list.nr; i++) {
 136                FILE *f;
 137                snprintf(file, sizeof(file), "%s/%s", curdir, list.items[i].path);
 138                f = fopen(file, "r");
 139                if (!f) {
 140                        error("cannot open mail %s (%s)", file, strerror(errno));
 141                        goto out;
 142                }
 143
 144                if (fgets(buf, sizeof(buf), f) == NULL) {
 145                        error("cannot read mail %s (%s)", file, strerror(errno));
 146                        goto out;
 147                }
 148
 149                sprintf(name, "%s/%0*d", dir, nr_prec, ++skip);
 150                split_one(f, name, 1);
 151
 152                fclose(f);
 153        }
 154
 155        path_list_clear(&list, 1);
 156
 157        ret = skip;
 158out:
 159        return ret;
 160}
 161
 162static int split_mbox(const char *file, const char *dir, int allow_bare,
 163                      int nr_prec, int skip)
 164{
 165        char name[PATH_MAX];
 166        int ret = -1;
 167
 168        FILE *f = !strcmp(file, "-") ? stdin : fopen(file, "r");
 169        int file_done = 0;
 170
 171        if (!f) {
 172                error("cannot open mbox %s", file);
 173                goto out;
 174        }
 175
 176        if (fgets(buf, sizeof(buf), f) == NULL) {
 177                /* empty stdin is OK */
 178                if (f != stdin) {
 179                        error("cannot read mbox %s", file);
 180                        goto out;
 181                }
 182                file_done = 1;
 183        }
 184
 185        while (!file_done) {
 186                sprintf(name, "%s/%0*d", dir, nr_prec, ++skip);
 187                file_done = split_one(f, name, allow_bare);
 188        }
 189
 190        if (f != stdin)
 191                fclose(f);
 192
 193        ret = skip;
 194out:
 195        return ret;
 196}
 197
 198int cmd_mailsplit(int argc, const char **argv, const char *prefix)
 199{
 200        int nr = 0, nr_prec = 4, num = 0;
 201        int allow_bare = 0;
 202        const char *dir = NULL;
 203        const char **argp;
 204        static const char *stdin_only[] = { "-", NULL };
 205
 206        for (argp = argv+1; *argp; argp++) {
 207                const char *arg = *argp;
 208
 209                if (arg[0] != '-')
 210                        break;
 211                /* do flags here */
 212                if ( arg[1] == 'd' ) {
 213                        nr_prec = strtol(arg+2, NULL, 10);
 214                        if (nr_prec < 3 || 10 <= nr_prec)
 215                                usage(git_mailsplit_usage);
 216                        continue;
 217                } else if ( arg[1] == 'f' ) {
 218                        nr = strtol(arg+2, NULL, 10);
 219                } else if ( arg[1] == 'b' && !arg[2] ) {
 220                        allow_bare = 1;
 221                } else if ( arg[1] == 'o' && arg[2] ) {
 222                        dir = arg+2;
 223                } else if ( arg[1] == '-' && !arg[2] ) {
 224                        argp++; /* -- marks end of options */
 225                        break;
 226                } else {
 227                        die("unknown option: %s", arg);
 228                }
 229        }
 230
 231        if ( !dir ) {
 232                /* Backwards compatibility: if no -o specified, accept
 233                   <mbox> <dir> or just <dir> */
 234                switch (argc - (argp-argv)) {
 235                case 1:
 236                        dir = argp[0];
 237                        argp = stdin_only;
 238                        break;
 239                case 2:
 240                        stdin_only[0] = argp[0];
 241                        dir = argp[1];
 242                        argp = stdin_only;
 243                        break;
 244                default:
 245                        usage(git_mailsplit_usage);
 246                }
 247        } else {
 248                /* New usage: if no more argument, parse stdin */
 249                if ( !*argp )
 250                        argp = stdin_only;
 251        }
 252
 253        while (*argp) {
 254                const char *arg = *argp++;
 255                struct stat argstat;
 256                int ret = 0;
 257
 258                if (arg[0] == '-' && arg[1] == 0) {
 259                        ret = split_mbox(arg, dir, allow_bare, nr_prec, nr);
 260                        if (ret < 0) {
 261                                error("cannot split patches from stdin");
 262                                return 1;
 263                        }
 264                        num += (ret - nr);
 265                        nr = ret;
 266                        continue;
 267                }
 268
 269                if (stat(arg, &argstat) == -1) {
 270                        error("cannot stat %s (%s)", arg, strerror(errno));
 271                        return 1;
 272                }
 273
 274                if (S_ISDIR(argstat.st_mode))
 275                        ret = split_maildir(arg, dir, nr_prec, nr);
 276                else
 277                        ret = split_mbox(arg, dir, allow_bare, nr_prec, nr);
 278
 279                if (ret < 0) {
 280                        error("cannot split patches from %s", arg);
 281                        return 1;
 282                }
 283                num += (ret - nr);
 284                nr = ret;
 285        }
 286
 287        printf("%d\n", num);
 288
 289        return 0;
 290}