- distinguish between the device name (what the user called it on the

command line) and the device path (what we passed to open()).  Use
  the former in diagnostics.
- when adding or removing partitions, print a single line to stdout for
  each partition that was added or removed, indicating its name.
- add an -a option to 'gpt remove' which must be explicitly specified
  to remove all partitions.

Approved by:	marcel (in prinicple)
MFC after:	2 weeks

sbin/gpt/add.c

@@ -147,6 +147,8 @@ add(int fd)
 
 	gpt_write(fd, lbt);
 	gpt_write(fd, tpg);
+
+	printf("%sp%u added\n", device_name, i + 1);
 }
 
 int

sbin/gpt/gpt.8

@@ -206,6 +206,11 @@ the GPT equivalent of a slice.
 .It Xo
 .Nm
 .Ic remove
+.Op Fl a
+.Xc
+.It Xo
+.Nm
+.Ic remove
 .Op Fl b Ar number
 .Op Fl i Ar index
 .Op Fl s Ar count
@@ -215,8 +220,12 @@ the GPT equivalent of a slice.
 The
 .Ic remove
 command allows the user to remove any partitions that match the selection.
-BEWARE: when no options are given, all GPT partitions will match and thus
-will be deleted.
+At least one option must be specified.
+.Pp
+The
+.Fl a
+option specifies that all partitions should be removed.
+It is mutually exclusive with all other options.
 .Pp
 The
 .Fl b Ar number

sbin/gpt/gpt.c

@@ -37,6 +37,7 @@ __FBSDID("$FreeBSD$");
 #include <err.h>
 #include <errno.h>
 #include <fcntl.h>
+#include <paths.h>
 #include <stddef.h>
 #include <stdio.h>
 #include <stdlib.h>
@@ -46,7 +47,8 @@ __FBSDID("$FreeBSD$");
 #include "map.h"
 #include "gpt.h"
 
-char	device_name[MAXPATHLEN];
+char	device_path[MAXPATHLEN];
+char	*device_name;
 
 off_t	mediasz;
 
@@ -374,24 +376,26 @@ int
 gpt_open(const char *dev)
 {
 	struct stat sb;
-	int fd;
+	int fd, mode;
 
-	if (!stat(dev, &sb)) {
-		strlcpy(device_name, dev, sizeof(device_name));
-		goto found;
-	}
+	mode = readonly ? O_RDONLY : O_RDWR|O_EXCL;
 
-	snprintf(device_name, sizeof(device_name), "/dev/%s", dev);
-	if (!stat(device_name, &sb))
+	strlcpy(device_path, dev, sizeof(device_path));
+	device_name = device_path;
+
+	if ((fd = open(device_path, mode)) != -1)
+		goto found;
+
+	snprintf(device_path, sizeof(device_path), "%s%s", _PATH_DEV, dev);
+	device_name = device_path + strlen(_PATH_DEV);
+	if ((fd = open(device_path, mode)) != -1)
 		goto found;
 
-	strlcpy(device_name, dev, sizeof(device_name));
 	return (-1);
 
  found:
-	fd = open(device_name, (readonly) ? O_RDONLY : O_RDWR|O_EXCL);
-	if (fd == -1)
-		return (-1);
+	if (fstat(fd, &sb) == -1)
+		goto close;
 
 	if ((sb.st_mode & S_IFMT) != S_IFREG) {
 		if (ioctl(fd, DIOCGSECTORSIZE, &secsz) == -1 ||

sbin/gpt/gpt.h

@@ -59,7 +59,7 @@ struct mbr {
 #define	MBR_SIG		0xAA55
 };
 
-extern char device_name[];
+extern char *device_name;
 extern off_t mediasz;
 extern u_int parts;
 extern u_int secsz;

sbin/gpt/remove.c

@@ -39,6 +39,7 @@ __FBSDID("$FreeBSD$");
 #include "map.h"
 #include "gpt.h"
 
+static int all;
 static uuid_t type;
 static off_t block, size;
 static unsigned int entry;
@@ -48,8 +49,9 @@ usage_remove(void)
 {
 
 	fprintf(stderr,
-	    "usage: %s [-b lba] [-i index] [-s lba] [-t uuid] device\n",
-	    getprogname());
+	    "usage: %s -a device\n"
+	    "       %s [-b lba] [-i index] [-s lba] [-t uuid] device\n",
+	    getprogname(), getprogname());
 	exit(1);
 }
 
@@ -130,6 +132,8 @@ rem(int fd)
 		gpt_write(fd, lbt);
 		gpt_write(fd, tpg);
 
+		printf("%sp%u removed\n", device_name, m->map_index);
+
 		removed++;
 	}
 
@@ -144,8 +148,13 @@ cmd_remove(int argc, char *argv[])
 	uint32_t status;
 
 	/* Get the remove options */
-	while ((ch = getopt(argc, argv, "b:i:s:t:")) != -1) {
+	while ((ch = getopt(argc, argv, "ab:i:s:t:")) != -1) {
 		switch(ch) {
+		case 'a':
+			if (all > 0)
+				usage_remove();
+			all = 1;
+			break;
 		case 'b':
 			if (block > 0)
 				usage_remove();
@@ -194,6 +203,10 @@ cmd_remove(int argc, char *argv[])
 		}
 	}
 
+	if (!all ^
+	    (block > 0 || entry > 0 || size > 0 || !uuid_is_nil(&type, NULL)))
+		usage_remove();
+
 	if (argc == optind)
 		usage_remove();