setfattr: new applet

function                                             old     new   delta
setfattr_main                                          -     189    +189
packed_usage                                       31516   31588     +72
setxattr                                               -      53     +53
lsetxattr                                              -      53     +53
removexattr                                            -      37     +37
lremovexattr                                           -      37     +37
applet_names                                        2649    2658      +9
find_applet_by_name                                  124     128      +4
applet_main                                         1532    1536      +4
------------------------------------------------------------------------------
(add/remove: 7/0 grow/shrink: 4/0 up/down: 458/0)             Total: 458 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

1 files changed, 68 insertions, 0 deletions

diff --git a/miscutils/setfattr.c b/miscutils/setfattr.c
new file mode 100644
index 000000000..f0ef227cb
--- /dev/null
+++ b/miscutils/setfattr.c
@@ -0,0 +1,68 @@
+/*
+ * setfattr - set extended attributes of filesystem objects.
+ *
+ * Copyright (C) 2017 by Denys Vlasenko <vda.linux@googlemail.com>
+ *
+ * Licensed under GPLv2, see file LICENSE in this source tree.
+ */
+//config:config SETFATTR
+//config:       bool "setfattr"
+//config:       default y
+//config:       help
+//config:       Set/delete extended attributes on files
+
+//applet:IF_SETFATTR(APPLET_NOEXEC(setfattr, setfattr, BB_DIR_USR_BIN, BB_SUID_DROP, setfattr))
+
+//kbuild:lib-$(CONFIG_SETFATTR) += setfattr.o
+
+#include <sys/xattr.h>
+#include "libbb.h"
+
+//usage:#define setfattr_trivial_usage
+//usage:       "[-h] -n|-x ATTR [-v VALUE] FILE..."
+//usage:#define setfattr_full_usage "\n\n"
+//usage:       "Set extended attributes"
+//usage:     "\n"
+//usage:     "\n        -h              Do not follow symlinks"
+//usage:     "\n        -x ATTR         Remove attribute ATTR"
+//usage:     "\n        -n ATTR         Set attribute ATTR to VALUE"
+//usage:     "\n        -v VALUE        (default: empty)"
+int setfattr_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
+int setfattr_main(int argc UNUSED_PARAM, char **argv)
+{
+        const char *name;
+        const char *value = "";
+        int status;
+        int opt;
+        enum {
+                OPT_h = (1 << 0),
+                OPT_x = (1 << 1),
+        };
+
+        opt = getopt32(argv, "^"
+                "hx:n:v:"
+                /* Min one arg, either -x or -n is a must, -x does not allow -v */
+                "\0" "-1:x:n:n--x:x--nv:v--x"
+                , &name, &name, &value
+        );
+        argv += optind;
+
+        status = EXIT_SUCCESS;
+        do {
+                int r;
+                if (opt & OPT_x)
+                        r = ((opt & OPT_h) ? lremovexattr : removexattr)(*argv, name);
+                else {
+                        r = ((opt & OPT_h) ? lsetxattr : setxattr)(
+                                        *argv, name,
+                                        value, strlen(value), /*flags:*/ 0
+                        );
+                }
+                if (r) {
+                        bb_simple_perror_msg(*argv);
+                        status = EXIT_FAILURE;
+                }
+        } while (*++argv);
+
+        return status;
+}