partprobe: new applet

function                                             old     new   delta
partprobe_main                                         -      79     +79
packed_usage                                       31485   31511     +26
applet_names                                        2608    2618     +10
applet_main                                         1512    1516      +4
applet_install_loc                                   189     190      +1
------------------------------------------------------------------------------
(add/remove: 2/0 grow/shrink: 4/0 up/down: 120/0)             Total: 120 bytes

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

1 files changed, 56 insertions, 0 deletions

diff --git a/miscutils/partprobe.c b/miscutils/partprobe.c
new file mode 100644
index 000000000..38831598d
--- /dev/null
+++ b/miscutils/partprobe.c
@@ -0,0 +1,56 @@
+/* vi: set sw=4 ts=4: */
+/*
+ * Copyright (C) 2017 Denys Vlasenko <vda.linux@googlemail.com>
+ *
+ * Licensed under GPLv2, see file LICENSE in this source tree.
+ */
+//config:config PARTPROBE
+//config:       bool "partprobe"
+//config:       default y
+//config:       select PLATFORM_LINUX
+//config:       help
+//config:         Ask kernel to rescan partition table.
+
+//applet:IF_PARTPROBE(APPLET(partprobe, BB_DIR_USR_SBIN, BB_SUID_DROP))
+
+//kbuild:lib-$(CONFIG_PARTPROBE) += partprobe.o
+
+#include <linux/fs.h>
+#include "libbb.h"
+#ifndef BLKRRPART
+# define BLKRRPART _IO(0x12,95)
+#endif
+
+//usage:#define partprobe_trivial_usage
+//usage:        "DEVICE..."
+//usage:#define partprobe_full_usage "\n\n"
+//usage:        "Ask kernel to rescan partition table"
+//
+// partprobe (GNU parted) 3.2:
+// -d, --dry-run        Don't update the kernel
+// -s, --summary        Show a summary of devices and their partitions
+
+int partprobe_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
+int partprobe_main(int argc UNUSED_PARAM, char **argv)
+{
+        getopt32(argv, "");
+        argv += optind;
+
+        /* "partprobe" with no arguments just does nothing */
+
+        while (*argv) {
+                int fd = xopen(*argv, O_RDONLY);
+                /*
+                 * Newer versions of parted scan partition tables themselves and
+                 * use BLKPG ioctl (BLKPG_DEL_PARTITION / BLKPG_ADD_PARTITION)
+                 * since this way kernel does not need to know
+                 * partition table formats.
+                 * We use good old BLKRRPART:
+                 */
+                ioctl_or_perror_and_die(fd, BLKRRPART, NULL, "%s", *argv);
+                close(fd);
+                argv++;
+        }
+
+        return EXIT_SUCCESS;
+}