[PATCH] erofs-utils: mkfs: add --exclude-from option

[zhaoyifan (H)]

On 2026/3/8 11:47, Nithurshen wrote:
> Currently, users who want to exclude multiple specific files or paths must pass them one-by-one using --exclude-path or --exclude-regex via the command line. This becomes cumbersome for complex build systems with dozens of exclusions.
>
> This patch introduces an \`--exclude-from=FILE\` flag to mkfs.erofs.
>
> Similar to standard archiving tools, it allows users to supply a text file containing a list of paths or regexes to exclude, which are read line-by-line and applied to the EROFS build process.

Hi Nithurshen,

72-char limit again.

Your code seems could not handle regex, as you call 
`erofs_parse_exclude_path(line, false)`.


Thanks,

Yifan

> Signed-off-by: Nithurshen <nithurshen.dev at gmail.com>
> ---
>   mkfs/main.c | 35 +++++++++++++++++++++++++++++++++++
>   1 file changed, 35 insertions(+)
>
> diff --git a/mkfs/main.c b/mkfs/main.c
> index 07ef086..a6cd251 100644
> --- a/mkfs/main.c
> +++ b/mkfs/main.c
> @@ -39,6 +39,7 @@ static struct option long_options[] = {
>   	{"help", no_argument, 0, 'h'},
>   	{"exclude-path", required_argument, NULL, 2},
>   	{"exclude-regex", required_argument, NULL, 3},
> +	{"exclude-from", required_argument, NULL, 540},
>   #ifdef HAVE_LIBSELINUX
>   	{"file-contexts", required_argument, NULL, 4},
>   #endif
> @@ -199,6 +200,7 @@ static void usage(int argc, char **argv)
>   		" --dsunit=#             align all data block addresses to multiples of #\n"
>   		" --exclude-path=X       avoid including file X (X = exact literal path)\n"
>   		" --exclude-regex=X      avoid including files that match X (X = regular expression)\n"
> +		" --exclude-from=X       avoid including files listed in file X\n"
>   #ifdef HAVE_LIBSELINUX
>   		" --file-contexts=X      specify a file contexts file to setup selinux labels\n"
>   #endif
> @@ -1246,6 +1248,39 @@ static int mkfs_parse_options_cfg(struct erofs_importer_params *params,
>   		case 7:
>   			params->fixed_uid = params->fixed_gid = 0;
>   			break;
> +		case 540: {
> +			FILE *f = fopen(optarg, "r");
> +			if (!f) {
> +				erofs_err("failed to open exclude file: %s", optarg);
> +				return -errno;
> +			}
> +
> +			char *line = NULL;
> +			size_t len = 0;
> +			ssize_t read;
> +
> +			while ((read = getline(&line, &len, f)) != -1) {
> +				if (read > 0 && line[read - 1] == '\n') {
> +					line[read - 1] = '\0';
> +					read--;
> +				}
> +
> +				if (read == 0) continue;
> +
> +				opt = erofs_parse_exclude_path(line, false);
> +				if (opt) {
> +					erofs_err("failed to parse exclude path from file: %s",
> +						  erofs_strerror(opt));
> +					free(line);
> +					fclose(f);
> +					return opt;
> +				}
> +			}
> +			free(line);
> +			fclose(f);
> +			break;
> +			}
> +
>   #ifndef NDEBUG
>   		case 8:
>   			cfg.c_random_pclusterblks = true;