thodg/ext4fs/mount_ext4fs/mount_ext4fs.c

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• Author : Thomas de Grivel
  Date : 2025-08-22 00:24:26
  Hash : 8f629bf6
  Message : mount_ext4fs

• mount_ext4fs/mount_ext4fs.c

• /* ext4fs
   * Copyright 2025 kmx.io <contact@kmx.io>
   *
   * Permission is hereby granted to use this software granted the above
   * copyright notice and this permission paragraph are included in all
   * copies and substantial portions of this software.
   *
   * THIS SOFTWARE IS PROVIDED "AS-IS" WITHOUT ANY GUARANTEE OF
   * PURPOSE AND PERFORMANCE. IN NO EVENT WHATSOEVER SHALL THE
   * AUTHOR BE CONSIDERED LIABLE FOR THE USE AND PERFORMANCE OF
   * THIS SOFTWARE.
   */
  #include <sys/types.h>
  #include <sys/mount.h>
  
  #include <err.h>
  #include <errno.h>
  #include <stdio.h>
  #include <stdlib.h>
  #include <string.h>
  #include <unistd.h>
  
  #include "mntopts.h"
  
  void ext4fs_usage(void);
  
  static const struct mntopt mopts[] = {
  	MOPT_STDOPTS,
  	MOPT_UPDATE,
  	{ NULL }
  };
  
  int
  main(int argc, char *argv[])
  {
  	struct ufs_args args;		/* XXX ffs_args */
  	int ch, mntflags;
  	char fs_name[PATH_MAX], *errcause;
  
  	mntflags = 0;
  	optind = optreset = 1;		/* Reset for parse of new argv. */
  	while ((ch = getopt(argc, argv, "o:")) != -1)
  		switch (ch) {
  		case 'o':
  			getmntopts(optarg, mopts, &mntflags);
  			break;
  		default:
  			ext4fs_usage();
  		}
  	argc -= optind;
  	argv += optind;
  
  	if (argc != 2)
  		ext4fs_usage();
  
  	args.fspec = argv[0];		/* The name of the device file. */
  	if (realpath(argv[1], fs_name) == NULL)	/* The mount point. */
  		err(1, "realpath %s", argv[1]);
  
  	#define DEFAULT_ROOTUID	-2
  	args.export_info.ex_root = DEFAULT_ROOTUID;
  
  	if (mntflags & MNT_RDONLY)
  		args.export_info.ex_flags = MNT_EXRDONLY;
  	else
  		args.export_info.ex_flags = 0;
  	if (mount(MOUNT_EXT4FS, fs_name, mntflags, &args) == -1) {
  		switch (errno) {
  		case EMFILE:
  			errcause = "mount table full";
  			break;
  		case EINVAL:
  			errcause =
  			    "specified device does not match mounted device";
  			break;
  		case EOPNOTSUPP:
  			errcause = "filesystem not supported by kernel";
  			break;
  		default:
  			errcause = strerror(errno);
  			break;
  		}
  		errx(1, "%s on %s: %s", args.fspec, fs_name, errcause);
  	}
  	exit(0);
  }
  
  void
  ext4fs_usage(void)
  {
  	(void)fprintf(stderr,
  		"usage: mount_ext4fs [-o options] special node\n");
  	exit(1);
  }