rm: implement -r

To recursively remove files and directories.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

commands/rm.c

@@ -19,17 +19,36 @@
 #include <common.h>
 #include <command.h>
 #include <fs.h>
+#include <getopt.h>
 #include <errno.h>
 
 static int do_rm(int argc, char *argv[])
 {
-	int i = 1;
+	int i, opt, recursive = 0;
+
+	while ((opt = getopt(argc, argv, "r")) > 0) {
+		switch (opt) {
+		case 'r':
+			recursive = 1;
+			break;
+		default:
+			return COMMAND_ERROR_USAGE;
+		}
+	}
 
 	if (argc < 2)
 		return COMMAND_ERROR_USAGE;
 
+	i = optind;
+
 	while (i < argc) {
-		if (unlink(argv[i])) {
+		int ret;
+
+		if (recursive)
+			ret = unlink_recursive(argv[i], NULL);
+		else
+			ret = unlink(argv[i]);
+		if (ret) {
 			printf("could not remove %s: %s\n", argv[i], errno_str());
 			return 1;
 		}
@@ -40,8 +59,9 @@ static int do_rm(int argc, char *argv[])
 }
 
 static const __maybe_unused char cmd_rm_help[] =
-"Usage: rm [FILES]\n"
-"Remove files\n";
+"Usage: rm [OPTIONS] [FILES]\n"
+"Remove files\n"
+"-r  remove directories and their contents recursively\n";
 
 BAREBOX_CMD_START(rm)
 	.cmd		= do_rm,

include/fs.h

@@ -182,4 +182,6 @@ void automount_remove(const char *_path);
 int automount_add(const char *path, const char *cmd);
 void automount_print(void);
 
+int unlink_recursive(const char *path, char **failedpath);
+
 #endif /* __FS_H */

lib/Makefile

@@ -36,3 +36,4 @@ obj-$(CONFIG_BITREV)	+= bitrev.o
 obj-$(CONFIG_QSORT)	+= qsort.o
 obj-y			+= gui/
 obj-$(CONFIG_XYMODEM)	+= xymodem.o
+obj-y			+= unlink-recursive.o

lib/recursive_action.c

@@ -130,7 +130,6 @@ int recursive_action(const char *fileName,
 		return 0;
 	return 1;
 done_nak_warn:
-	printf("%s", fileName);
 	return 0;
 }
 

lib/unlink-recursive.c

@@ -0,0 +1,56 @@
+#include <common.h>
+#include <libbb.h>
+#include <fs.h>
+
+static char unlink_recursive_failedpath[PATH_MAX];
+
+struct data {
+	int error;
+};
+
+static int file_action(const char *filename, struct stat *statbuf,
+			    void *userdata, int depth)
+{
+	struct data *data = userdata;
+	int ret;
+
+	ret = unlink(filename);
+	if (ret) {
+		strcpy(unlink_recursive_failedpath, filename);
+		data->error = ret;
+	}
+
+	return ret ? 0 : 1;
+}
+
+static int dir_action(const char *dirname, struct stat *statbuf,
+			    void *userdata, int depth)
+{
+	struct data *data = userdata;
+	int ret;
+
+	ret = rmdir(dirname);
+	if (ret) {
+		strcpy(unlink_recursive_failedpath, dirname);
+		data->error = ret;
+	}
+
+	return ret ? 0 : 1;
+}
+
+int unlink_recursive(const char *path, char **failedpath)
+{
+	struct data data = {};
+	int ret;
+
+	if (failedpath)
+		*failedpath = NULL;
+
+	ret = recursive_action(path, ACTION_RECURSE | ACTION_DEPTHFIRST,
+			file_action, dir_action, &data, 0);
+
+	if (!ret && failedpath)
+		*failedpath = unlink_recursive_failedpath;
+
+	return ret ? 0 : errno;
+}