losetup: Add partition scanning option
Add -P option from util-linux losetup to scan for partitions.
function old new delta
losetup_main 449 482 +33
packed_usage 33264 33292 +28
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 2/0 up/down: 61/0) Total: 61 bytes
Signed-off-by: Jack O'Sullivan <jackos1998@gmail.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
diff --git a/util-linux/losetup.c b/util-linux/losetup.c
index 2248f2c..b52d693 100644
--- a/util-linux/losetup.c
+++ b/util-linux/losetup.c
@@ -20,13 +20,14 @@
//kbuild:lib-$(CONFIG_LOSETUP) += losetup.o
//usage:#define losetup_trivial_usage
-//usage: "[-r] [-o OFS] {-f|LOOPDEV} FILE: associate loop devices\n"
+//usage: "[-rP] [-o OFS] {-f|LOOPDEV} FILE: associate loop devices\n"
//usage: " losetup -c LOOPDEV: reread file size\n"
//usage: " losetup -d LOOPDEV: disassociate\n"
//usage: " losetup -a: show status\n"
//usage: " losetup -f: show next free loop device"
//usage:#define losetup_full_usage "\n\n"
//usage: " -o OFS Start OFS bytes into FILE"
+//usage: "\n -P Scan for partitions"
//usage: "\n -r Read-only"
//usage: "\n -f Show/use next free loop device"
//usage:
@@ -35,8 +36,9 @@
//usage: "(if any), or disassociate it (with -d). The display shows the offset\n"
//usage: "and filename of the file the loop device is currently bound to.\n\n"
//usage: "Two arguments (losetup /dev/loop1 file.img) create a new association,\n"
-//usage: "with an optional offset (-o 12345). Encryption is not yet supported.\n"
-//usage: "losetup -f will show the first loop free loop device\n\n"
+//usage: "with optional partition scanning (creates /dev/loop1p1, /dev/loop1p2\n"
+//usage: "etc. with -P) and with an optional offset (-o 12345). Encryption is\n"
+//usage: "not yet supported. losetup -f will show the first free loop device\n\n"
#include "libbb.h"
@@ -53,13 +55,14 @@
enum {
OPT_c = (1 << 0),
OPT_d = (1 << 1),
- OPT_o = (1 << 2),
- OPT_f = (1 << 3),
- OPT_a = (1 << 4),
- OPT_r = (1 << 5),
+ OPT_P = (1 << 2),
+ OPT_o = (1 << 3),
+ OPT_f = (1 << 4),
+ OPT_a = (1 << 5),
+ OPT_r = (1 << 6),
};
- opt = getopt32(argv, "^" "cdo:far" "\0" "?2:d--ofar:a--ofr", &opt_o);
+ opt = getopt32(argv, "^" "cdPo:far" "\0" "?2:d--Pofar:a--Pofr", &opt_o);
argv += optind;
/* LOOPDEV */
@@ -127,7 +130,7 @@
}
}
- /* [-r] [-o OFS] {-f|LOOPDEV} FILE */
+ /* [-rP] [-o OFS] {-f|LOOPDEV} FILE */
if (argv[0] && ((opt & OPT_f) || argv[1])) {
unsigned long long offset = 0;
char *d = dev;
@@ -138,7 +141,11 @@
d = *argv++;
if (argv[0]) {
- if (set_loop(&d, argv[0], offset, (opt & OPT_r) ? BB_LO_FLAGS_READ_ONLY : 0) < 0)
+ unsigned flags = (opt & OPT_r) ? BB_LO_FLAGS_READ_ONLY : 0;
+ if (opt & OPT_P) {
+ flags |= BB_LO_FLAGS_PARTSCAN;
+ }
+ if (set_loop(&d, argv[0], offset, flags) < 0)
bb_simple_perror_msg_and_die(argv[0]);
return EXIT_SUCCESS;
}