From 51b4c92f80dc232b9d34985f99a4479393644433 Mon Sep 17 00:00:00 2001
From: Denis Vlasenko
Date: Fri, 27 Oct 2006 16:07:20 +0000
Subject: chown: add -vcf support if CONFIG_DESKTOP chmod: stop following
 symlinks

---
 coreutils/chmod.c | 31 ++++++++++++++++++++++++++-----
 1 file changed, 26 insertions(+), 5 deletions(-)

(limited to 'coreutils/chmod.c')

diff --git a/coreutils/chmod.c b/coreutils/chmod.c
index 18334b8..c4f8fa0 100644
--- a/coreutils/chmod.c
+++ b/coreutils/chmod.c
@@ -22,9 +22,23 @@
 #define OPT_QUIET   (USE_DESKTOP(option_mask32 & 8) SKIP_DESKTOP(0))
 #define OPT_STR     ("-R" USE_DESKTOP("vcf"))
 
+/* TODO:
+ * chmod never changes the permissions of symbolic links; the chmod
+ * system call cannot change their permissions. This is not a problem
+ * since the permissions of symbolic links are never used.
+ * However, for each symbolic link listed on the command line, chmod changes
+ * the permissions of the pointed-to file. In contrast, chmod ignores
+ * symbolic links encountered during recursive directory traversals.
+ */
+
 static int fileAction(const char *fileName, struct stat *statbuf, void* junk)
 {
 	mode_t newmode = statbuf->st_mode;
+
+	// TODO: match GNU behavior:
+	// if (depth > 0 && S_ISLNK(statbuf->st_mode)) return TRUE;
+	// if (depth == 0) follow link
+
 	if (!bb_parse_mode((char *)junk, &newmode))
 		bb_error_msg_and_die("invalid mode: %s", (char *)junk);
 
@@ -33,7 +47,7 @@ static int fileAction(const char *fileName, struct stat *statbuf, void* junk)
 		 || (OPT_CHANGED && statbuf->st_mode != newmode)
 		) {
 			printf("mode of '%s' changed to %04o (%s)\n", fileName,
-				newmode & 7777, bb_mode_string(newmode)+1);
+				newmode & 07777, bb_mode_string(newmode)+1);
 		}
 		return TRUE;
 	}
@@ -48,10 +62,11 @@ int chmod_main(int argc, char **argv)
 	char *arg, **argp;
 	char *smode;
 
-	/* Convert first encountered -r into a-r, etc */
+	/* Convert first encountered -r into a-r, -w into a-w etc */
 	argp = argv + 1;
 	while ((arg = *argp)) {
-		/* Protect against mishandling e.g. "chmod 644 -r" */
+		/* Mode spec must be the first arg (sans -R etc) */
+		/* (protect against mishandling e.g. "chmod 644 -r") */
 		if (arg[0] != '-')
 			break;
 		/* An option. Not a -- or valid option? */
@@ -72,8 +87,14 @@ int chmod_main(int argc, char **argv)
 
 	/* Ok, ready to do the deed now */
 	do {
-		if (!recursive_action(*argv, OPT_RECURSE, TRUE, FALSE,
-					fileAction, fileAction, smode)) {
+		if (!recursive_action(*argv,
+				OPT_RECURSE,    // recurse
+				FALSE,          // follow links: GNU doesn't
+				FALSE,          // depth first
+				fileAction,     // file action
+				fileAction,     // dir action
+				smode)          // user data
+		) {
 			retval = EXIT_FAILURE;
 		}
 	} while (*++argv);
-- 
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