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git/builtin-mailsplit.c
Thomas Rast 0721c314a5 Use die_errno() instead of die() when checking syscalls
Lots of die() calls did not actually report the kind of error, which
can leave the user confused as to the real problem.  Use die_errno()
where we check a system/library call that sets errno on failure, or
one of the following that wrap such calls:

  Function              Passes on error from
  --------              --------------------
  odb_pack_keep         open
  read_ancestry         fopen
  read_in_full          xread
  strbuf_read           xread
  strbuf_read_file      open or strbuf_read_file
  strbuf_readlink       readlink
  write_in_full         xwrite

Signed-off-by: Thomas Rast <trast@student.ethz.ch>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2009-06-27 11:14:53 -07:00

320 lines
6.4 KiB
C

/*
* Totally braindamaged mbox splitter program.
*
* It just splits a mbox into a list of files: "0001" "0002" ..
* so you can process them further from there.
*/
#include "cache.h"
#include "builtin.h"
#include "string-list.h"
static const char git_mailsplit_usage[] =
"git mailsplit [-d<prec>] [-f<n>] [-b] -o<directory> [<mbox>|<Maildir>...]";
static int is_from_line(const char *line, int len)
{
const char *colon;
if (len < 20 || memcmp("From ", line, 5))
return 0;
colon = line + len - 2;
line += 5;
for (;;) {
if (colon < line)
return 0;
if (*--colon == ':')
break;
}
if (!isdigit(colon[-4]) ||
!isdigit(colon[-2]) ||
!isdigit(colon[-1]) ||
!isdigit(colon[ 1]) ||
!isdigit(colon[ 2]))
return 0;
/* year */
if (strtol(colon+3, NULL, 10) <= 90)
return 0;
/* Ok, close enough */
return 1;
}
/* Could be as small as 64, enough to hold a Unix "From " line. */
static char buf[4096];
/* We cannot use fgets() because our lines can contain NULs */
int read_line_with_nul(char *buf, int size, FILE *in)
{
int len = 0, c;
for (;;) {
c = getc(in);
if (c == EOF)
break;
buf[len++] = c;
if (c == '\n' || len + 1 >= size)
break;
}
buf[len] = '\0';
return len;
}
/* Called with the first line (potentially partial)
* already in buf[] -- normally that should begin with
* the Unix "From " line. Write it into the specified
* file.
*/
static int split_one(FILE *mbox, const char *name, int allow_bare)
{
FILE *output = NULL;
int len = strlen(buf);
int fd;
int status = 0;
int is_bare = !is_from_line(buf, len);
if (is_bare && !allow_bare)
goto corrupt;
fd = open(name, O_WRONLY | O_CREAT | O_EXCL, 0666);
if (fd < 0)
die_errno("cannot open output file '%s'", name);
output = fdopen(fd, "w");
/* Copy it out, while searching for a line that begins with
* "From " and having something that looks like a date format.
*/
for (;;) {
int is_partial = len && buf[len-1] != '\n';
if (fwrite(buf, 1, len, output) != len)
die_errno("cannot write output");
len = read_line_with_nul(buf, sizeof(buf), mbox);
if (len == 0) {
if (feof(mbox)) {
status = 1;
break;
}
die_errno("cannot read mbox");
}
if (!is_partial && !is_bare && is_from_line(buf, len))
break; /* done with one message */
}
fclose(output);
return status;
corrupt:
if (output)
fclose(output);
unlink(name);
fprintf(stderr, "corrupt mailbox\n");
exit(1);
}
static int populate_maildir_list(struct string_list *list, const char *path)
{
DIR *dir;
struct dirent *dent;
char name[PATH_MAX];
char *subs[] = { "cur", "new", NULL };
char **sub;
for (sub = subs; *sub; ++sub) {
snprintf(name, sizeof(name), "%s/%s", path, *sub);
if ((dir = opendir(name)) == NULL) {
if (errno == ENOENT)
continue;
error("cannot opendir %s (%s)", name, strerror(errno));
return -1;
}
while ((dent = readdir(dir)) != NULL) {
if (dent->d_name[0] == '.')
continue;
snprintf(name, sizeof(name), "%s/%s", *sub, dent->d_name);
string_list_insert(name, list);
}
closedir(dir);
}
return 0;
}
static int split_maildir(const char *maildir, const char *dir,
int nr_prec, int skip)
{
char file[PATH_MAX];
char name[PATH_MAX];
int ret = -1;
int i;
struct string_list list = {NULL, 0, 0, 1};
if (populate_maildir_list(&list, maildir) < 0)
goto out;
for (i = 0; i < list.nr; i++) {
FILE *f;
snprintf(file, sizeof(file), "%s/%s", maildir, list.items[i].string);
f = fopen(file, "r");
if (!f) {
error("cannot open mail %s (%s)", file, strerror(errno));
goto out;
}
if (fgets(buf, sizeof(buf), f) == NULL) {
error("cannot read mail %s (%s)", file, strerror(errno));
goto out;
}
sprintf(name, "%s/%0*d", dir, nr_prec, ++skip);
split_one(f, name, 1);
fclose(f);
}
ret = skip;
out:
string_list_clear(&list, 1);
return ret;
}
static int split_mbox(const char *file, const char *dir, int allow_bare,
int nr_prec, int skip)
{
char name[PATH_MAX];
int ret = -1;
int peek;
FILE *f = !strcmp(file, "-") ? stdin : fopen(file, "r");
int file_done = 0;
if (!f) {
error("cannot open mbox %s", file);
goto out;
}
do {
peek = fgetc(f);
} while (isspace(peek));
ungetc(peek, f);
if (fgets(buf, sizeof(buf), f) == NULL) {
/* empty stdin is OK */
if (f != stdin) {
error("cannot read mbox %s", file);
goto out;
}
file_done = 1;
}
while (!file_done) {
sprintf(name, "%s/%0*d", dir, nr_prec, ++skip);
file_done = split_one(f, name, allow_bare);
}
if (f != stdin)
fclose(f);
ret = skip;
out:
return ret;
}
int cmd_mailsplit(int argc, const char **argv, const char *prefix)
{
int nr = 0, nr_prec = 4, num = 0;
int allow_bare = 0;
const char *dir = NULL;
const char **argp;
static const char *stdin_only[] = { "-", NULL };
for (argp = argv+1; *argp; argp++) {
const char *arg = *argp;
if (arg[0] != '-')
break;
/* do flags here */
if ( arg[1] == 'd' ) {
nr_prec = strtol(arg+2, NULL, 10);
if (nr_prec < 3 || 10 <= nr_prec)
usage(git_mailsplit_usage);
continue;
} else if ( arg[1] == 'f' ) {
nr = strtol(arg+2, NULL, 10);
} else if ( arg[1] == 'b' && !arg[2] ) {
allow_bare = 1;
} else if ( arg[1] == 'o' && arg[2] ) {
dir = arg+2;
} else if ( arg[1] == '-' && !arg[2] ) {
argp++; /* -- marks end of options */
break;
} else {
die("unknown option: %s", arg);
}
}
if ( !dir ) {
/* Backwards compatibility: if no -o specified, accept
<mbox> <dir> or just <dir> */
switch (argc - (argp-argv)) {
case 1:
dir = argp[0];
argp = stdin_only;
break;
case 2:
stdin_only[0] = argp[0];
dir = argp[1];
argp = stdin_only;
break;
default:
usage(git_mailsplit_usage);
}
} else {
/* New usage: if no more argument, parse stdin */
if ( !*argp )
argp = stdin_only;
}
while (*argp) {
const char *arg = *argp++;
struct stat argstat;
int ret = 0;
if (arg[0] == '-' && arg[1] == 0) {
ret = split_mbox(arg, dir, allow_bare, nr_prec, nr);
if (ret < 0) {
error("cannot split patches from stdin");
return 1;
}
num += (ret - nr);
nr = ret;
continue;
}
if (stat(arg, &argstat) == -1) {
error("cannot stat %s (%s)", arg, strerror(errno));
return 1;
}
if (S_ISDIR(argstat.st_mode))
ret = split_maildir(arg, dir, nr_prec, nr);
else
ret = split_mbox(arg, dir, allow_bare, nr_prec, nr);
if (ret < 0) {
error("cannot split patches from %s", arg);
return 1;
}
num += (ret - nr);
nr = ret;
}
printf("%d\n", num);
return 0;
}