klibc-utils: new applets: resume, nuke, minips

minips is a pure alias to ps, just in case someone needs 100% klibc-utils compat.
nuke is a primitive version of "rm -rf" without options and error checks. ~30 bytes.

resume is a tool for initramfs which resumes from a given block device.

function                                             old     new   delta
resume_main                                            -     582    +582
packed_usage                                       31640   31712     +72
nuke_main                                              -      28     +28
xstrtoull                                              -      24     +24
applet_names                                        2646    2665     +19
applet_main                                         1532    1544     +12
applet_suid                                           96      97      +1
applet_install_loc                                   192     193      +1
applet_flags                                          96      97      +1
------------------------------------------------------------------------------
(add/remove: 5/0 grow/shrink: 6/0 up/down: 740/0)             Total: 740 bytes

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

1 files changed, 46 insertions, 0 deletions

diff --git a/klibc-utils/nuke.c b/klibc-utils/nuke.c
new file mode 100644
index 000000000..363e03cce
--- /dev/null
+++ b/klibc-utils/nuke.c
@@ -0,0 +1,46 @@
+/*
+ * Copyright (c) 2017 Denys Vlasenko <vda.linux@googlemail.com>
+ *
+ * Licensed under GPLv2 or later, see file LICENSE in this source tree.
+ */
+//config:config NUKE
+//config:	bool "nuke"
+//config:	default y
+//config:	help
+//config:	Alias to "rm -rf".
+
+//applet:IF_NUKE(APPLET_NOEXEC(nuke, nuke, BB_DIR_BIN, BB_SUID_DROP, nuke))
+
+//kbuild:lib-$(CONFIG_NUKE) += nuke.o
+
+//usage:#define nuke_trivial_usage
+//usage:       "DIR..."
+//usage:#define nuke_full_usage "\n\n"
+//usage:       "Resursively remove DIRs"
+
+#include "libbb.h"
+
+/* This is a NOEXEC applet. Be very careful! */
+
+int nuke_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
+int nuke_main(int argc UNUSED_PARAM, char **argv)
+{
+// klibc-utils do not check opts, will try to delete "-dir" args
+	//opt = getopt32(argv, "");
+	//argv += optind;
+
+	while (*++argv) {
+#if 0
+// klibc-utils do not check this, will happily operate on ".."
+		const char *base = bb_get_last_path_component_strip(*argv);
+		if (DOT_OR_DOTDOT(base)) {
+			bb_error_msg("can't remove '.' or '..'");
+			continue;
+		}
+#endif
+		remove_file(*argv, FILEUTILS_FORCE | FILEUTILS_RECUR);
+	}
+
+// klibc-utils do not indicate errors
+	return EXIT_SUCCESS;
+}