/* blkid.c - Prints type, label and UUID of filesystem(s). * * Copyright 2013 Brad Conroy <bconroy@uis.edu> * * See ftp://ftp.kernel.org/pub/linux/utils/util-linux/v2.24/libblkid-docs/api-index-full.html USE_BLKID(NEWTOY(blkid, "<1", TOYFLAG_BIN)) USE_BLKID(OLDTOY(fstype, blkid, "<1", TOYFLAG_BIN)) config BLKID bool "blkid" default y help usage: blkid [block device...] Prints type, label and UUID of filesystem. */ #define FOR_blkid #include "toys.h" struct fstype { char *name; uint64_t magic; int magic_len, magic_offset, uuid_off, label_len, label_off; }; static const struct fstype fstypes[] = { // ext3 = buf[1116]&4 ext4 = buf[1120]&64 {"ext2", 0xEF53, 2, 1080, 1128, 16, 1144}, // label actually 8/16 0x4d80 but horrible: 16 bit wide characters via // codepage, something called a uuid that's only 8 bytes long... {"ntfs", 0x5346544e, 4, 3, 0x48+(8<<24), 0, 0}, {"adfs", 0xadf5, 2, 0xc00, 0,0,0}, {"bfs", 0x1badface, 4, 0, 0,0,0}, {"btrfs", 0x4D5F53665248425FULL, 8, 65600, 65803, 256, 65819}, {"cramfs", 0x28cd3d45, 4, 0, 0, 16, 48}, {"f2fs", 0xF2F52010, 4, 1024, 1132, 16, 1110}, {"jfs", 0x3153464a, 4, 32768, 32920, 16, 32904}, {"nilfs", 0x3434, 2, 1030, 1176, 80, 1192}, {"murderfs", 0x724573496552, 6, 8244, 8276, 16, 8292}, {"murderfs", 0x724573496552, 6, 65588, 65620, 16, 65536}, {"romfs", 0x2d6d6f72, 4, 0, 0,0,0}, {"squashfs", 0x73717368, 4, 0, 0,0,0}, {"xiafs", 0x012fd16d, 4, 572, 0,0,0}, {"xfs", 0x42534658, 4, 0, 32, 12, 108}, {"vfat", 0x3233544146, 5, 82, 67+(4<<24), 11, 71}, // fat32 {"vfat", 0x31544146, 4, 54, 39+(4<<24), 11, 43} // fat1 }; /* TODO if no args use proc/partitions */ void do_blkid(int fd, char *name) { int off, i, j; char *type; off = i = 0; for (;;) { int pass = 0, len; // Read next block of data len = readall(fd, toybuf, sizeof(toybuf)); if (len != sizeof(toybuf)) return; // Iterate through types in range for (i=0; i < sizeof(fstypes)/sizeof(struct fstype); i++) { uint64_t test; // Skip tests not in this 4k block if (fstypes[i].magic_offset > off+sizeof(toybuf)) { pass++; continue; } if (fstypes[i].magic_offset < off) continue; // Populate 64 bit little endian magic value test = 0; for (j = 0; j < fstypes[i].magic_len; j++) test += ((uint64_t)toybuf[j+fstypes[i].magic_offset-off])<<(8*j); if (test == fstypes[i].magic) break; } if (i == sizeof(fstypes)/sizeof(struct fstype)) { off += len; if (pass) continue; return; } break; } // distinguish ext2/3/4 type = fstypes[i].name; if (!i) { if (toybuf[1116]&4) type = "ext3"; if (toybuf[1120]&64) type = "ext4"; } // Could special case NTFS here... // Output for fstype if (*toys.which->name == 'f') { puts(type); return; } // output for blkid printf("%s:",name); if (fstypes[i].label_len) printf(" LABEL=\"%.*s\"", fstypes[i].label_len, toybuf+fstypes[i].label_off-off); if (fstypes[i].uuid_off) { int bits = 0x550, size = fstypes[i].uuid_off >> 24, uoff = (fstypes[i].uuid_off & ((1<<24)-1))-off; if (size) bits = 4*(size == 4); else size = 16; printf(" UUID=\""); for (j = 0; j < size; j++) printf("-%02x"+!(bits & (1<<j)), toybuf[uoff+j]); printf("\""); } printf(" TYPE=\"%s\"\n", fstypes[i].name); } void blkid_main(void) { loopfiles(toys.optargs, do_blkid); }