1/*
2 * Copyright (c) 1992, 1993, 1994
3 * The Regents of the University of California. All rights reserved.
4 *
5 * This code is derived from software donated to Berkeley by
6 * Jan-Simon Pendry.
7 *
8 * Redistribution and use in source and binary forms, with or without

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48#include <sys/mount.h>
49
50#include <miscfs/union/union.h>
51
52#include <err.h>
53#include <stdio.h>
54#include <stdlib.h>
55#include <string.h>
56#include <sysexits.h>
57#include <unistd.h>
58
59#include "mntopts.h"
60
61static struct mntopt mopts[] = {
62 MOPT_STDOPTS,
63 { NULL }
64};
65
66static int subdir __P((const char *, const char *));
67static __dead void usage __P((void)) __dead2;
68
69int
70main(argc, argv)
71 int argc;
72 char *argv[];
73{
74 struct union_args args;
75 int ch, mntflags;

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98 }
99 argc -= optind;
100 argv += optind;
101
102 if (argc != 2)
103 usage();
104
105 if (realpath(argv[0], target) == 0)
106 err(EX_OSERR, "%s", target);
107
108 if (subdir(target, argv[1]) || subdir(argv[1], target))
109 errx(EX_USAGE, "%s (%s) and %s are not distinct paths",
110 argv[0], target, argv[1]);
111
112 args.target = target;
113
114 vfc = getvfsbyname("union");
115 if(!vfc && vfsisloadable("union")) {
116 if(vfsload("union"))
117 err(1, "vfsload(union)");
118 endvfsent(); /* flush cache */
119 vfc = getvfsbyname("union");
120 }
121 if (!vfc)
122 errx(EX_OSERR, "union filesystem is not available");
123
124 if (mount(vfc->vfc_index, argv[1], mntflags, &args))
125 err(EX_OSERR, target);
126 exit(0);
127}
128
129int
130subdir(p, dir)
131 const char *p;
132 const char *dir;
133{

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143 return (0);
144}
145
146void
147usage()
148{
149 (void)fprintf(stderr,
150 "usage: mount_union [-br] [-o options] target_fs mount_point\n");
151 exit(EX_USAGE);
152}