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losetup: Add partition scanning option

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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>
This commit is contained in:
Jack O'Sullivan 2019-05-28 15:28:27 +01:00 committed by Denys Vlasenko
parent bcb1fc3e6c
commit 726cbb1be8
2 changed files with 18 additions and 10 deletions
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1
include/libbb.h
View File

@ -1471,6 +1471,7 @@ extern int set_loop(char **devname, const char *file, unsigned long long offset,
/* These constants match linux/loop.h (without BB_ prefix): */
#define BB_LO_FLAGS_READ_ONLY 1
#define BB_LO_FLAGS_AUTOCLEAR 4
#define BB_LO_FLAGS_PARTSCAN 8
/* Returns malloced str */
char *bb_ask_noecho(int fd, int timeout, const char *prompt) FAST_FUNC;

27
util-linux/losetup.c
View File

@ -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 @@ int losetup_main(int argc UNUSED_PARAM, char **argv)
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 @@ int losetup_main(int argc UNUSED_PARAM, char **argv)
}
}
/* [-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 @@ int losetup_main(int argc UNUSED_PARAM, char **argv)
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;
}