New toys - chmod, chown, and chgrp.

1 files changed, 92 insertions, 0 deletions

diff --git a/toys/chmod.c b/toys/chmod.c
new file mode 100644
index 00000000..71f3202f
--- /dev/null
+++ b/toys/chmod.c
@@ -0,0 +1,92 @@
+/* vi: set sw=4 ts=4:
+ *
+ * chmod.c - Change file mode bits
+ *
+ * Copyright 2012 Georgi Chorbadzhiyski <georgi@unixsol.org>
+ *
+ * See http://pubs.opengroup.org/onlinepubs/009695399/utilities/chmod.html
+ *
+
+USE_CHMOD(NEWTOY(chmod, "<2Rfv", TOYFLAG_BIN))
+
+config CHMOD
+	bool "chmod"
+	default y
+	help
+	  usage: chmod [-R] [-f] [-v] mode file...
+	  Change mode bits of one or more files.
+
+	  -R	recurse into subdirectories.
+	  -f	suppress most error messages.
+	  -v	verbose output.
+*/
+
+#include "toys.h"
+
+#define FLAG_R 4
+#define FLAG_f 2
+#define FLAG_v 1
+
+DEFINE_GLOBALS(
+	long mode;
+)
+
+#define TT this.chmod
+
+static int do_chmod(const char *path) {
+	int ret = chmod(path, TT.mode);
+	if (toys.optflags & FLAG_v)
+		xprintf("chmod(%04o, %s)\n", TT.mode, path);
+	if (ret == -1 && !(toys.optflags & FLAG_f))
+		perror_msg("changing perms of '%s' to %04o", path, TT.mode);
+	toys.exitval |= ret;
+	return ret;
+}
+
+// Copied from toys/cp.c:cp_node()
+int chmod_node(char *path, struct dirtree *node)
+{
+	char *s = path + strlen(path);
+	struct dirtree *n = node;
+
+	for ( ; ; n = n->parent) {
+		while (s!=path) {
+			if (*(--s) == '/') break;
+		}
+		if (!n) break;
+	}
+	if (s != path) s++;
+
+	do_chmod(s);
+
+	return 0;
+}
+
+void chmod_main(void)
+{
+	char **s;
+	TT.mode = strtoul(*toys.optargs, NULL, 8);
+
+	if (toys.optflags & FLAG_R) {
+		// Recurse into subdirectories
+		for (s=toys.optargs + 1; *s; s++) {
+			struct stat sb;
+			if (stat(*s, &sb) == -1) {
+				if (!(toys.optflags & FLAG_f))
+					perror_msg("%s", *s);
+				continue;
+			}
+			do_chmod(*s);
+			if (S_ISDIR(sb.st_mode)) {
+				strncpy(toybuf, *s, sizeof(toybuf) - 1);
+				toybuf[sizeof(toybuf) - 1] = 0;
+				dirtree_read(toybuf, NULL, chmod_node);
+			}
+		}
+	} else {
+		// Do not recurse
+		for (s=toys.optargs + 1; *s; s++) {
+			do_chmod(*s);
+		}
+	}
+}