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authorRodney W. Grimes <rgrimes@FreeBSD.org>1994-05-26 06:35:07 +0000
committerRodney W. Grimes <rgrimes@FreeBSD.org>1994-05-26 06:35:07 +0000
commit8fae3551ec46402adf7ab034cf9e02bcbc7ca8ee (patch)
treeb01471c3d6b141c37639a14b7a25f0433d926a99 /sbin/mount_unionfs/mount_unionfs.c
parent4b88c807ea9c629dc5691abc7e3cac9ea0d776dd (diff)
downloadsrc-8fae3551ec46402adf7ab034cf9e02bcbc7ca8ee.tar.gz
src-8fae3551ec46402adf7ab034cf9e02bcbc7ca8ee.zip
BSD 4.4 Lite sbin Sources
Note: XNSrouted and routed NOT imported here, they shall be imported with usr.sbin.
Notes
Notes: svn path=/head/; revision=1558
Diffstat (limited to 'sbin/mount_unionfs/mount_unionfs.c')
-rw-r--r--sbin/mount_unionfs/mount_unionfs.c140
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diff --git a/sbin/mount_unionfs/mount_unionfs.c b/sbin/mount_unionfs/mount_unionfs.c
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+++ b/sbin/mount_unionfs/mount_unionfs.c
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+/*
+ * Copyright (c) 1992, 1993, 1994
+ * The Regents of the University of California. All rights reserved.
+ *
+ * This code is derived from software donated to Berkeley by
+ * Jan-Simon Pendry.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ * must display the following acknowledgement:
+ * This product includes software developed by the University of
+ * California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#ifndef lint
+char copyright[] =
+"@(#) Copyright (c) 1992, 1993, 1994\n\
+ The Regents of the University of California. All rights reserved.\n";
+#endif /* not lint */
+
+#ifndef lint
+static char sccsid[] = "@(#)mount_union.c 8.5 (Berkeley) 3/27/94";
+#endif /* not lint */
+
+#include <sys/param.h>
+#include <sys/mount.h>
+
+#include <miscfs/union/union.h>
+
+#include <err.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#include "mntopts.h"
+
+struct mntopt mopts[] = {
+ MOPT_STDOPTS,
+ { NULL }
+};
+
+int subdir __P((const char *, const char *));
+void usage __P((void));
+
+int
+main(argc, argv)
+ int argc;
+ char *argv[];
+{
+ struct union_args args;
+ int ch, mntflags;
+ char target[MAXPATHLEN];
+
+ mntflags = 0;
+ args.mntflags = UNMNT_ABOVE;
+ while ((ch = getopt(argc, argv, "bo:r")) != EOF)
+ switch (ch) {
+ case 'b':
+ args.mntflags &= ~UNMNT_OPMASK;
+ args.mntflags |= UNMNT_BELOW;
+ break;
+ case 'o':
+ getmntopts(optarg, mopts, &mntflags);
+ break;
+ case 'r':
+ args.mntflags &= ~UNMNT_OPMASK;
+ args.mntflags |= UNMNT_REPLACE;
+ break;
+ case '?':
+ default:
+ usage();
+ /* NOTREACHED */
+ }
+ argc -= optind;
+ argv += optind;
+
+ if (argc != 2)
+ usage();
+
+ if (realpath(argv[0], target) == 0)
+ err(1, "%s", target);
+
+ if (subdir(target, argv[1]) || subdir(argv[1], target))
+ errx(1, "%s (%s) and %s are not distinct paths",
+ argv[0], target, argv[1]);
+
+ args.target = target;
+
+ if (mount(MOUNT_UNION, argv[1], mntflags, &args))
+ err(1, NULL);
+ exit(0);
+}
+
+int
+subdir(p, dir)
+ const char *p;
+ const char *dir;
+{
+ int l;
+
+ l = strlen(dir);
+ if (l <= 1)
+ return (1);
+
+ if ((strncmp(p, dir, l) == 0) && (p[l] == '/' || p[l] == '\0'))
+ return (1);
+
+ return (0);
+}
+
+void
+usage()
+{
+ (void)fprintf(stderr,
+ "usage: mount_union [-br] [-o options] target_fs mount_point\n");
+ exit(1);
+}