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Add CACHEDIR.TAG support.

Browse source 
A new command line parameter allows to filter out directories containing
the proper `CACHEDIR.TAG` file.
See http://www.brynosaurus.com/cachedir/
This commit is contained in:
Petr Pudlak 2013-04-10 16:41:26 +02:00
parent 9b4f2d8601
commit 3def47c331
4 changed files with 35 additions and 0 deletions
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4
src/dir_scan.c
View file

@ -196,6 +196,10 @@ static int dir_scan_item(struct dir *d) {
if(!(d->flags & (FF_ERR|FF_EXL)))
stat_to_dir(d, &st);
if(cachedir_tags && (d->flags & FF_DIR) && !(d->flags & (FF_ERR|FF_EXL|FF_OTHFS)))
if(has_cachedir_tag(d->name))
d->flags |= FF_EXL;
/* Recurse into the dir or output the item */
if(d->flags & FF_DIR && !(d->flags & (FF_ERR|FF_EXL|FF_OTHFS)))
fail = dir_scan_recurse(d);

23
src/exclude.c
View file

@ -99,3 +99,26 @@ void exclude_clear() {
excludes = NULL;
}
/*
* Exclusion of directories that contain only cached information.
* See http://www.brynosaurus.com/cachedir/
*/
static const char cachedir_tag_signature[] =
"Signature: 8a477f597d28d172789f06886806bc55";
int has_cachedir_tag(const char *name) {
char buf[1024];
FILE *f;
int match = 0;
const int signature_l = strlen(cachedir_tag_signature);
snprintf(buf, sizeof(buf), "%s/CACHEDIR.TAG", name);
f = fopen(buf, "rb");
if (f != NULL) {
match = ((fread(buf, 1, signature_l, f) == signature_l) &&
!strncmp(buf, cachedir_tag_signature, signature_l));
fclose(f);
}
return match;
}

2
src/global.h
View file

@ -86,6 +86,8 @@ extern int pstate;
extern int read_only;
/* minimum screen update interval when calculating, in ms */
extern long update_delay;
/* filter directories with CACHEDIR.TAG */
extern int cachedir_tags;
/* handle input from keyboard and update display */
int input_handle(int);

6
src/main.c
View file

@ -40,6 +40,7 @@
int pstate;
int read_only = 0;
long update_delay = 100;
int cachedir_tags = 0;
static int min_rows = 17, min_cols = 60;
static int ncurses_init = 0;
@ -125,6 +126,7 @@ static void argv_parse(int argc, char **argv) {
{ '2', 0, "-2" },
{ 1, 1, "--exclude" },
{ 'X', 1, "-X,--exclude-from" },
{ 'C', 0, "-C,--cachedir-tag" },
{0,0,NULL}
};
@ -146,6 +148,7 @@ static void argv_parse(int argc, char **argv) {
printf(" -0,-1,-2 UI to use when scanning (0=none,2=full ncurses)\n");
printf(" --exclude PATTERN Exclude files that match PATTERN\n");
printf(" -X, --exclude-from FILE Exclude files that match any pattern in FILE\n");
printf(" -C, --cachedir-tag Exclude directories containing CACHEDIR.TAG\n");
exit(0);
case 'q': update_delay = 2000; break;
case 'v':
@ -165,6 +168,9 @@ static void argv_parse(int argc, char **argv) {
exit(1);
}
break;
case 'C':
cachedir_tags = 1;
break;
case -2:
printf("ncdu: %s.\n", val);
exit(1);