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Diffstat (limited to 'libfdisk/samples/mkpart-fullspec.c')
| -rw-r--r-- | libfdisk/samples/mkpart-fullspec.c | 192 |
1 files changed, 192 insertions, 0 deletions
diff --git a/libfdisk/samples/mkpart-fullspec.c b/libfdisk/samples/mkpart-fullspec.c new file mode 100644 index 0000000..8b439f7 --- /dev/null +++ b/libfdisk/samples/mkpart-fullspec.c @@ -0,0 +1,192 @@ +/* + * Copyright (C) 2017 Karel Zak <kzak@redhat.com> + * + * This file may be redistributed under the terms of the + * GNU Lesser General Public License. + * + * + * Libfdisk sample to create partitions by specify all required partition + * properties (partno, start and size). The defauls is only partition type + * (except MBR where 4th partition is extended). + */ +#include <stdlib.h> +#include <unistd.h> +#include <string.h> +#include <errno.h> +#include <sys/types.h> +#include <sys/stat.h> +#include <dirent.h> +#include <getopt.h> + +#include "c.h" +#include "nls.h" +#include "strutils.h" +#include "xalloc.h" + +#include "libfdisk.h" + +static int ask_callback(struct fdisk_context *cxt __attribute__((__unused__)), + struct fdisk_ask *ask, + void *data) +{ + switch(fdisk_ask_get_type(ask)) { + case FDISK_ASKTYPE_INFO: + fputs(fdisk_ask_print_get_mesg(ask), stdout); + fputc('\n', stdout); + break; + case FDISK_ASKTYPE_WARNX: + fflush(stdout); + fputs(fdisk_ask_print_get_mesg(ask), stderr); + fputc('\n', stderr); + break; + case FDISK_ASKTYPE_WARN: + fflush(stdout); + fputs(fdisk_ask_print_get_mesg(ask), stderr); + errno = fdisk_ask_print_get_errno(ask); + fprintf(stderr, ": %m\n"); + break; + default: + break; + } + return 0; +} + +int main(int argc, char *argv[]) +{ + struct fdisk_context *cxt; + struct fdisk_partition *pa; + const char *label = NULL, *device = NULL; + int c; + size_t n = 1; + + static const struct option longopts[] = { + { "label", required_argument, NULL, 'x' }, + { "device", required_argument, NULL, 'd' }, + { "help", no_argument, NULL, 'h' }, + { NULL, 0, NULL, 0 }, + }; + + setlocale(LC_ALL, ""); /* just to have enable UTF8 chars */ + + fdisk_init_debug(0); + + while((c = getopt_long(argc, argv, "x:d:h", longopts, NULL)) != -1) { + switch(c) { + case 'x': + label = optarg; + break; + case 'd': + device = optarg; + break; + case 'h': + printf("%s [options] -- <partno,start,size> ...", program_invocation_short_name); + fputs(USAGE_SEPARATOR, stdout); + puts("Make disklabel and partitions."); + puts(" <partno> 1..n (4th is extended for MBR), or '-' for default"); + puts(" <start> partition start offset in sectors"); + puts(" <size> partition size in sectors"); + fputs(USAGE_OPTIONS, stdout); + puts(" -x, --label <dos,gpt,...> disk label type (default MBR)"); + puts(" -d, --device <path> block device"); + puts(" -h, --help this help"); + fputs(USAGE_SEPARATOR, stdout); + return EXIT_SUCCESS; + } + } + + if (!device) + errx(EXIT_FAILURE, "no device specified"); + if (!label) + label = "dos"; + + cxt = fdisk_new_context(); + if (!cxt) + err_oom(); + fdisk_set_ask(cxt, ask_callback, NULL); + + pa = fdisk_new_partition(); + if (!pa) + err_oom(); + + if (fdisk_assign_device(cxt, device, 0)) + err(EXIT_FAILURE, "failed to assign device"); + if (fdisk_create_disklabel(cxt, label)) + err(EXIT_FAILURE, "failed to create disk label"); + + fdisk_disable_dialogs(cxt, 1); + + while (optind < argc) { + int rc; + unsigned int partno = 0; + uint64_t start = 0, size = 0; + const char *str = argv[optind]; + + fdisk_reset_partition(pa); + fdisk_partition_end_follow_default(pa, 0); + + if (*str == '-') { + /* partno unspecified */ + if (sscanf(str, "-,%"SCNu64",%"SCNu64"", &start, &size) != 2) + errx(EXIT_FAILURE, "failed to parse %s", str); + fdisk_partition_partno_follow_default(pa, 1); + fdisk_partition_unset_partno(pa); + } else { + /* partno specified */ + if (sscanf(str, "%u,%"SCNu64",%"SCNu64"", &partno, &start, &size) != 3) + errx(EXIT_FAILURE, "failed to parse %s", str); + + fdisk_partition_partno_follow_default(pa, 0); + fdisk_partition_set_partno(pa, partno - 1); /* library uses 0..n */ + } + + fdisk_partition_set_start(pa, start); + fdisk_partition_set_size(pa, size); + + if (fdisk_partition_has_partno(pa)) + fprintf(stderr, "Requested partition: <partno=%zu,start=%ju,size=%ju>\n", + fdisk_partition_get_partno(pa), + (uintmax_t) fdisk_partition_get_start(pa), + (uintmax_t) fdisk_partition_get_size(pa)); + else + fprintf(stderr, "Requested partition: <partno=<default>,start=%ju,size=%ju>\n", + (uintmax_t) fdisk_partition_get_start(pa), + (uintmax_t) fdisk_partition_get_size(pa)); + + if (fdisk_is_label(cxt, DOS)) { + /* Make sure last primary partition is extended if user + * wants more than 4 partitions. + */ + if ((partno == 4 || (n == 4 && !fdisk_partition_has_partno(pa))) + && optind + 1 < argc) { + struct fdisk_parttype *type = + fdisk_label_parse_parttype( + fdisk_get_label(cxt, NULL), "05"); + if (!type) + err_oom(); + fdisk_partition_set_type(pa, type); + fdisk_unref_parttype(type); + } + } + + rc = fdisk_add_partition(cxt, pa, NULL); + if (rc) { + errno = -rc; + errx(EXIT_FAILURE, "failed to add #%zu partition", + fdisk_partition_has_partno(pa) ? + fdisk_partition_get_partno(pa) + 1: n); + } + + fdisk_reset_partition(pa); + optind++; + n++; + } + + if (fdisk_write_disklabel(cxt)) + err(EXIT_FAILURE, "failed to write disk label"); + + fdisk_deassign_device(cxt, 1); + fdisk_unref_context(cxt); + fdisk_unref_partition(pa); + + return EXIT_SUCCESS; +} |