Loading...
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 | /* 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: "[-r] [-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 -r Read-only" //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), OPT_r = (1 << 3), /* must be last */ }; /* max 2 args, -d,-o,-f opts are mutually exclusive */ opt_complementary = "?2:d--of:o--df:f--do"; opt = getopt32(argv, "do:fr", &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]) { /* [-r] [-o OFS] BLOCKDEV FILE */ if (set_loop(&argv[0], argv[1], offset, (opt / OPT_r)) < 0) bb_simple_perror_msg_and_die(argv[0]); return EXIT_SUCCESS; } /* [-r] [-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; } /* [-r] [-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; } |