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authorGravatar Jack O'Sullivan <jackos1998@gmail.com>2019-05-28 15:28:27 +0100
committerGravatar Denys Vlasenko <vda.linux@googlemail.com>2019-05-30 16:22:52 +0200
commit726cbb1be8620496cdf05d23bd98bdeb0983b4f0 (patch)
treec85dcdbbe86fe8e3920ec1f0869736c6594fd1ee
parentbcb1fc3e6ca6fe902610f507eaf9b0b58a5c583a (diff)
downloadbusybox-726cbb1be8620496cdf05d23bd98bdeb0983b4f0.tar.gz
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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>
-rw-r--r--include/libbb.h1
-rw-r--r--util-linux/losetup.c27
2 files changed, 18 insertions, 10 deletions
diff --git a/include/libbb.h b/include/libbb.h
index 33766e989..3a870bf80 100644
--- a/include/libbb.h
+++ b/include/libbb.h
@@ -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;
diff --git a/util-linux/losetup.c b/util-linux/losetup.c
index 2248f2cba..b52d693ec 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 @@ 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;
}