Andrew's git - gitweb.git/blob

c2ec6ea3d51e760581dcb6f86c1783a545ebc07a
   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] -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;
  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 fd;
  75        int status = 0;
  76        int is_bare = !is_from_line(buf.buf, buf.len);
  77
  78        if (is_bare && !allow_bare)
  79                goto corrupt;
  80
  81        fd = open(name, O_WRONLY | O_CREAT | O_EXCL, 0666);
  82        if (fd < 0)
  83                die_errno("cannot open output file '%s'", name);
  84        output = fdopen(fd, "w");
  85
  86        /* Copy it out, while searching for a line that begins with
  87         * "From " and having something that looks like a date format.
  88         */
  89        for (;;) {
  90                if (fwrite(buf.buf, 1, buf.len, output) != buf.len)
  91                        die_errno("cannot write output");
  92
  93                if (strbuf_getwholeline(&buf, mbox, '\n')) {
  94                        if (feof(mbox)) {
  95                                status = 1;
  96                                break;
  97                        }
  98                        die_errno("cannot read mbox");
  99                }
 100                if (!is_bare && is_from_line(buf.buf, buf.len))
 101                        break; /* done with one message */
 102        }
 103        fclose(output);
 104        return status;
 105
 106 corrupt:
 107        if (output)
 108                fclose(output);
 109        unlink(name);
 110        fprintf(stderr, "corrupt mailbox\n");
 111        exit(1);
 112}
 113
 114static int populate_maildir_list(struct string_list *list, const char *path)
 115{
 116        DIR *dir;
 117        struct dirent *dent;
 118        char name[PATH_MAX];
 119        char *subs[] = { "cur", "new", NULL };
 120        char **sub;
 121
 122        for (sub = subs; *sub; ++sub) {
 123                snprintf(name, sizeof(name), "%s/%s", path, *sub);
 124                if ((dir = opendir(name)) == NULL) {
 125                        if (errno == ENOENT)
 126                                continue;
 127                        error("cannot opendir %s (%s)", name, strerror(errno));
 128                        return -1;
 129                }
 130
 131                while ((dent = readdir(dir)) != NULL) {
 132                        if (dent->d_name[0] == '.')
 133                                continue;
 134                        snprintf(name, sizeof(name), "%s/%s", *sub, dent->d_name);
 135                        string_list_insert(name, list);
 136                }
 137
 138                closedir(dir);
 139        }
 140
 141        return 0;
 142}
 143
 144static int split_maildir(const char *maildir, const char *dir,
 145        int nr_prec, int skip)
 146{
 147        char file[PATH_MAX];
 148        char name[PATH_MAX];
 149        int ret = -1;
 150        int i;
 151        struct string_list list = {NULL, 0, 0, 1};
 152
 153        if (populate_maildir_list(&list, maildir) < 0)
 154                goto out;
 155
 156        for (i = 0; i < list.nr; i++) {
 157                FILE *f;
 158                snprintf(file, sizeof(file), "%s/%s", maildir, list.items[i].string);
 159                f = fopen(file, "r");
 160                if (!f) {
 161                        error("cannot open mail %s (%s)", file, strerror(errno));
 162                        goto out;
 163                }
 164
 165                if (strbuf_getwholeline(&buf, f, '\n')) {
 166                        error("cannot read mail %s (%s)", file, strerror(errno));
 167                        goto out;
 168                }
 169
 170                sprintf(name, "%s/%0*d", dir, nr_prec, ++skip);
 171                split_one(f, name, 1);
 172
 173                fclose(f);
 174        }
 175
 176        ret = skip;
 177out:
 178        string_list_clear(&list, 1);
 179        return ret;
 180}
 181
 182static int split_mbox(const char *file, const char *dir, int allow_bare,
 183                      int nr_prec, int skip)
 184{
 185        char name[PATH_MAX];
 186        int ret = -1;
 187        int peek;
 188
 189        FILE *f = !strcmp(file, "-") ? stdin : fopen(file, "r");
 190        int file_done = 0;
 191
 192        if (!f) {
 193                error("cannot open mbox %s", file);
 194                goto out;
 195        }
 196
 197        do {
 198                peek = fgetc(f);
 199        } while (isspace(peek));
 200        ungetc(peek, f);
 201
 202        if (strbuf_getwholeline(&buf, f, '\n')) {
 203                /* empty stdin is OK */
 204                if (f != stdin) {
 205                        error("cannot read mbox %s", file);
 206                        goto out;
 207                }
 208                file_done = 1;
 209        }
 210
 211        while (!file_done) {
 212                sprintf(name, "%s/%0*d", dir, nr_prec, ++skip);
 213                file_done = split_one(f, name, allow_bare);
 214        }
 215
 216        if (f != stdin)
 217                fclose(f);
 218
 219        ret = skip;
 220out:
 221        return ret;
 222}
 223
 224int cmd_mailsplit(int argc, const char **argv, const char *prefix)
 225{
 226        int nr = 0, nr_prec = 4, num = 0;
 227        int allow_bare = 0;
 228        const char *dir = NULL;
 229        const char **argp;
 230        static const char *stdin_only[] = { "-", NULL };
 231
 232        for (argp = argv+1; *argp; argp++) {
 233                const char *arg = *argp;
 234
 235                if (arg[0] != '-')
 236                        break;
 237                /* do flags here */
 238                if ( arg[1] == 'd' ) {
 239                        nr_prec = strtol(arg+2, NULL, 10);
 240                        if (nr_prec < 3 || 10 <= nr_prec)
 241                                usage(git_mailsplit_usage);
 242                        continue;
 243                } else if ( arg[1] == 'f' ) {
 244                        nr = strtol(arg+2, NULL, 10);
 245                } else if ( arg[1] == 'b' && !arg[2] ) {
 246                        allow_bare = 1;
 247                } else if ( arg[1] == 'o' && arg[2] ) {
 248                        dir = arg+2;
 249                } else if ( arg[1] == '-' && !arg[2] ) {
 250                        argp++; /* -- marks end of options */
 251                        break;
 252                } else {
 253                        die("unknown option: %s", arg);
 254                }
 255        }
 256
 257        if ( !dir ) {
 258                /* Backwards compatibility: if no -o specified, accept
 259                   <mbox> <dir> or just <dir> */
 260                switch (argc - (argp-argv)) {
 261                case 1:
 262                        dir = argp[0];
 263                        argp = stdin_only;
 264                        break;
 265                case 2:
 266                        stdin_only[0] = argp[0];
 267                        dir = argp[1];
 268                        argp = stdin_only;
 269                        break;
 270                default:
 271                        usage(git_mailsplit_usage);
 272                }
 273        } else {
 274                /* New usage: if no more argument, parse stdin */
 275                if ( !*argp )
 276                        argp = stdin_only;
 277        }
 278
 279        while (*argp) {
 280                const char *arg = *argp++;
 281                struct stat argstat;
 282                int ret = 0;
 283
 284                if (arg[0] == '-' && arg[1] == 0) {
 285                        ret = split_mbox(arg, dir, allow_bare, nr_prec, nr);
 286                        if (ret < 0) {
 287                                error("cannot split patches from stdin");
 288                                return 1;
 289                        }
 290                        num += (ret - nr);
 291                        nr = ret;
 292                        continue;
 293                }
 294
 295                if (stat(arg, &argstat) == -1) {
 296                        error("cannot stat %s (%s)", arg, strerror(errno));
 297                        return 1;
 298                }
 299
 300                if (S_ISDIR(argstat.st_mode))
 301                        ret = split_maildir(arg, dir, nr_prec, nr);
 302                else
 303                        ret = split_mbox(arg, dir, allow_bare, nr_prec, nr);
 304
 305                if (ret < 0) {
 306                        error("cannot split patches from %s", arg);
 307                        return 1;
 308                }
 309                num += (ret - nr);
 310                nr = ret;
 311        }
 312
 313        printf("%d\n", num);
 314
 315        return 0;
 316}