119 lines
2.5 KiB
C
119 lines
2.5 KiB
C
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#include <getopt.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <fcntl.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <unistd.h>
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#include "c.h"
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#include "nls.h"
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#include "partx.h"
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#include "sysfs.h"
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#include "strutils.h"
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#include "closestream.h"
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static void __attribute__((__noreturn__)) usage(void)
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{
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FILE *out = stdout;
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fputs(USAGE_HEADER, out);
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fprintf(out, _(" %s <disk device> <partition number> <length>\n"),
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program_invocation_short_name);
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fputs(USAGE_SEPARATOR, out);
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fputs(_("Tell the kernel about the new size of a partition.\n"), out);
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fputs(USAGE_OPTIONS, out);
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printf(USAGE_HELP_OPTIONS(16));
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printf(USAGE_MAN_TAIL("resizepart(8)"));
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exit(EXIT_SUCCESS);
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}
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static int get_partition_start(int fd, int partno, uint64_t *start)
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{
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struct stat st;
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struct path_cxt *disk = NULL, *part = NULL;
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dev_t devno = 0;
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int rc = -1;
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/*
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* wholedisk
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*/
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if (fstat(fd, &st) || !S_ISBLK(st.st_mode))
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goto done;
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devno = st.st_rdev;
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disk = ul_new_sysfs_path(devno, NULL, NULL);
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if (!disk)
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goto done;
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/*
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* partition
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*/
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devno = sysfs_blkdev_partno_to_devno(disk, partno);
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if (!devno)
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goto done;
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part = ul_new_sysfs_path(devno, disk, NULL);
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if (!part)
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goto done;
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if (ul_path_read_u64(part, start, "start"))
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goto done;
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rc = 0;
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done:
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ul_unref_path(part);
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ul_unref_path(disk);
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return rc;
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}
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int main(int argc, char **argv)
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{
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int c, fd, partno;
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const char *wholedisk;
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uint64_t start;
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static const struct option longopts[] = {
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{"help", no_argument, NULL, 'h'},
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{"version", no_argument, NULL, 'V'},
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{NULL, 0, NULL, '0'},
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};
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setlocale(LC_ALL, "");
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bindtextdomain(PACKAGE, LOCALEDIR);
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textdomain(PACKAGE);
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close_stdout_atexit();
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while ((c = getopt_long(argc, argv, "Vh", longopts, NULL)) != -1)
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switch (c) {
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case 'V':
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print_version(EXIT_SUCCESS);
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case 'h':
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usage();
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default:
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errtryhelp(EXIT_FAILURE);
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}
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if (argc != 4) {
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warnx(_("not enough arguments"));
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errtryhelp(EXIT_FAILURE);
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}
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wholedisk = argv[1];
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partno = strtou32_or_err(argv[2], _("invalid partition number argument"));
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if ((fd = open(wholedisk, O_RDONLY)) < 0)
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err(EXIT_FAILURE, _("cannot open %s"), wholedisk);
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if (get_partition_start(fd, partno, &start))
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err(EXIT_FAILURE, _("%s: failed to get start of the partition number %s"),
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wholedisk, argv[2]);
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if (partx_resize_partition(fd, partno, start,
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strtou64_or_err(argv[3], _("invalid length argument"))))
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err(EXIT_FAILURE, _("failed to resize partition"));
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if (close_fd(fd) != 0)
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err(EXIT_FAILURE, _("write failed"));
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return 0;
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}
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