| /* vi: set sw=4 ts=4: */ |
| /* |
| * Mini losetup implementation for busybox |
| * |
| * Copyright (C) 2002 Matt Kraai. |
| * |
| * Licensed under GPLv2 or later, see file LICENSE in this source tree. |
| */ |
| |
| //usage:#define losetup_trivial_usage |
| //usage: "[-o OFS] LOOPDEV FILE - associate loop devices\n" |
| //usage: " losetup -d LOOPDEV - disassociate\n" |
| //usage: " losetup [-f] - show" |
| //usage:#define losetup_full_usage "\n\n" |
| //usage: " -o OFS Start OFS bytes into FILE" |
| //usage: "\n -f Show first free loop device" |
| //usage: |
| //usage:#define losetup_notes_usage |
| //usage: "No arguments will display all current associations.\n" |
| //usage: "One argument (losetup /dev/loop1) will display the current association\n" |
| //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" |
| |
| #include "libbb.h" |
| |
| int losetup_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
| int losetup_main(int argc UNUSED_PARAM, char **argv) |
| { |
| unsigned opt; |
| int n; |
| char *opt_o; |
| unsigned long long offset = 0; |
| enum { |
| OPT_d = (1 << 0), |
| OPT_o = (1 << 1), |
| OPT_f = (1 << 2), |
| }; |
| |
| /* max 2 args, all opts are mutually exclusive */ |
| opt_complementary = "?2:d--of:o--df:f--do"; |
| opt = getopt32(argv, "do:f", &opt_o); |
| argv += optind; |
| |
| if (opt == OPT_o) |
| offset = xatoull(opt_o); |
| |
| if (opt == OPT_d) { |
| /* -d BLOCKDEV */ |
| if (!argv[0] || argv[1]) |
| bb_show_usage(); |
| if (del_loop(argv[0])) |
| bb_simple_perror_msg_and_die(argv[0]); |
| return EXIT_SUCCESS; |
| } |
| |
| if (argv[0]) { |
| char *s; |
| |
| if (opt == OPT_f) /* -f should not have arguments */ |
| bb_show_usage(); |
| |
| if (argv[1]) { |
| /* [-o OFS] BLOCKDEV FILE */ |
| if (set_loop(&argv[0], argv[1], offset) < 0) |
| bb_simple_perror_msg_and_die(argv[0]); |
| return EXIT_SUCCESS; |
| } |
| /* [-o OFS] BLOCKDEV */ |
| s = query_loop(argv[0]); |
| if (!s) |
| bb_simple_perror_msg_and_die(argv[0]); |
| printf("%s: %s\n", argv[0], s); |
| if (ENABLE_FEATURE_CLEAN_UP) |
| free(s); |
| return EXIT_SUCCESS; |
| } |
| |
| /* [-o OFS|-f] with no params */ |
| n = 0; |
| while (1) { |
| char *s; |
| char dev[LOOP_NAMESIZE]; |
| |
| sprintf(dev, LOOP_FORMAT, n); |
| s = query_loop(dev); |
| n++; |
| if (!s) { |
| if (n > 9 && errno && errno != ENXIO) |
| return EXIT_SUCCESS; |
| if (opt == OPT_f) { |
| puts(dev); |
| return EXIT_SUCCESS; |
| } |
| } else { |
| if (opt != OPT_f) |
| printf("%s: %s\n", dev, s); |
| if (ENABLE_FEATURE_CLEAN_UP) |
| free(s); |
| } |
| } |
| return EXIT_SUCCESS; |
| } |