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File: [cvs.NetBSD.org] / src / distrib / utils / sysinst / Attic / target.c (download)

Revision 1.55, Fri Apr 6 23:48:54 2012 UTC (2 years, 5 months ago) by riz
Branch: MAIN
CVS Tags: yamt-pagecache-base9, yamt-pagecache-base8, yamt-pagecache-base7, yamt-pagecache-base6, yamt-pagecache-base5, yamt-pagecache-base4, riastradh-xf86-video-intel-2-7-1-pre-2-21-15, riastradh-drm2-base3, riastradh-drm2-base2, riastradh-drm2-base1, riastradh-drm2-base, riastradh-drm2, khorben-n900, agc-symver-base, agc-symver
Branch point for: tls-maxphys, tls-earlyentropy
Changes since 1.54: +8 -2 lines

Implement a post-install configuration menu, as proposed on tech-install.
Enables the user to configure a few additional items, including using
pkgin to manage binary packages, in a post-install menu which replaces
the series of questions (Do you want to set a root password? etc).

This is by no means a perfect solution, nor should it discourage anyone
from working on more sweeping changes to sysinst.

Some bug fixes, and .de translation provided by Julian Fagir.

XXX .es, .fr and .pl translations still needed.  Please help!

/*	$NetBSD: target.c,v 1.55 2012/04/06 23:48:54 riz Exp $	*/

/*
 * Copyright 1997 Jonathan Stone
 * All rights reserved.
 *
 * 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 for the NetBSD Project by
 *      Jonathan Stone.
 * 4. The name of Jonathan Stone may not be used to endorse
 *    or promote products derived from this software without specific prior
 *    written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY JONATHAN STONE ``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 PIERMONT INFORMATION SYSTEMS INC. 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.
 *
 */

/* Copyright below applies to the realpath() code */

/*
 * Copyright (c) 1989, 1991, 1993, 1995
 *      The Regents of the University of California.  All rights reserved.
 *      
 * This code is derived from software contributed 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. 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.
 */     


#include <sys/cdefs.h>
#if defined(LIBC_SCCS) && !defined(lint)
__RCSID("$NetBSD: target.c,v 1.55 2012/04/06 23:48:54 riz Exp $");
#endif

/*
 * target.c -- path-prefixing routines to access the target installation
 *  filesystems. Makes the install tools more independent of whether
 *  we're installing into a separate filesystem hierarchy mounted under
 * /targetroot, or into the currently active root mounted on /.
 */

#include <sys/param.h>			/* XXX vm_param.h always defines TRUE*/
#include <sys/types.h>
#include <sys/sysctl.h>
#include <sys/stat.h>			/* stat() */
#include <sys/mount.h>			/* statfs() */

#include <fcntl.h>
#include <stdio.h>
#include <stdarg.h>
#include <unistd.h>
#include <curses.h>			/* defines TRUE, but checks  */
#include <errno.h>


#include "defs.h"
#include "md.h"
#include "msg_defs.h"
#include "menu_defs.h"

/*
 * local  prototypes 
 */

static void make_prefixed_dir (const char *prefix, const char *path);
static int do_target_chdir (const char *dir, int flag);
int	target_test(unsigned int mode, const char *path);
int	target_test_dir (const char *path);	/* deprecated */
int	target_test_file (const char *path);	/* deprecated */
int	target_test_symlink (const char *path);	/* deprecated */

void unwind_mounts(void);

/* Record a mount for later unwinding of target mounts. */
struct unwind_mount {
	struct unwind_mount *um_prev;
	char um_mountpoint[4];		/* Allocated longer... */
};

/* Unwind-mount stack */
struct unwind_mount *unwind_mountlist = NULL;

/*
 * Debugging options
 */
/*#define DEBUG_ROOT*/		/* turn on what-is-root? debugging. */
/*#define DEBUG_UNWIND*/	/* turn on unwind-target-mount debugging. */

/*
 * debugging helper. curses...
 */
#if defined(DEBUG)  ||	defined(DEBUG_ROOT)
void
backtowin(void)
{

	fflush(stdout);	/* curses does not leave stdout linebuffered. */
	getchar();	/* wait for user to press return */
	wrefresh(stdscr);
}
#endif


/*
 * Is the root partition we're running from the same as the root 
 * which the user has selected to install/upgrade?
 * Uses global variable "diskdev" to find the selected device for
 * install/upgrade.
 */
int
target_already_root(void)
{

	if (strcmp(diskdev, "") == 0)
		/* No root partition was ever selected.
		 * Assume that the currently mounted one should be used
		 */
		return 1;

	return is_active_rootpart(diskdev, rootpart);
}


/*
 * Is this device partition (e.g., "sd0a") mounted as root? 
 */
int
is_active_rootpart(const char *dev, int ptn)
{
	int mib[2];
	char rootdev[SSTRSIZE];
	int rootptn;
	size_t varlen;

	mib[0] = CTL_KERN;
	mib[1] = KERN_ROOT_DEVICE;
	varlen = sizeof(rootdev);
	if (sysctl(mib, 2, rootdev, &varlen, NULL, 0) < 0)
		return 1;

	if (strcmp(dev, rootdev) != 0)
		return 0;

	mib[1] = KERN_ROOT_PARTITION;
	varlen = sizeof rootptn;
	if (sysctl(mib, 2, &rootptn, &varlen, NULL, 0) < 0)
		return 1;

	return ptn == rootptn;
}

/*
 * Pathname  prefixing glue to support installation either 
 * from in-ramdisk miniroots or on-disk diskimages.
 * If our root is on the target disk, the install target is mounted
 * on /targetroot and we need to prefix installed pathnames with /targetroot.
 * otherwise we are installing to the currently-active root and
 * no prefix is needed.
 */
const char *
target_prefix(void)
{
	/*
	 * XXX fetch sysctl variable for current root, and compare 
	 * to the devicename of the install target disk.
	 */
	return(target_already_root() ? "" : targetroot_mnt);
}

/*
 * concatenate two pathnames.
 * XXX returns either input args or result in a static buffer.
 * The caller must copy if it wants to use the pathname past the 
 * next call to a target-prefixing  function, or to modify the inputs..
 * Used only  internally so this is probably safe.
 */
const char *  
concat_paths(const char *prefix, const char *suffix)
{
	static char real_path[MAXPATHLEN];

	/* absolute prefix and null suffix? */
	if (prefix[0] == '/' && suffix[0] == 0)
		return prefix;

	/* null prefix and absolute suffix? */
	if (prefix[0] == 0 && suffix[0] == '/')
		return suffix;

	/* avoid "//" */
	if (suffix[0] == '/' || suffix[0] == 0)
		snprintf(real_path, sizeof(real_path), "%s%s", prefix, suffix);
	else
		snprintf(real_path, sizeof(real_path), "%s/%s", 
		    prefix, suffix);
	return (real_path);
}

/*
 * Do target prefix expansion on a pathname.
 * XXX uses concat_paths and so returns result in a static buffer.
 * The caller must copy if it wants to use the pathname past the 
 * next call to a target-prefixing  function, or to modify the inputs..
 * Used only  internally so this is probably safe.
 *
 * Not static so other functions can generate target related file names.
 */
const char *
target_expand(const char *tgtpath)
{

	return concat_paths(target_prefix(), tgtpath);
}

/* Make a directory, with a prefix like "/targetroot" or possibly just "". */
static void 
make_prefixed_dir(const char *prefix, const char *path)
{

	run_program(0, "/bin/mkdir -p %s", concat_paths(prefix, path));
}

/* Make a directory with a pathname relative to the installation target. */
void
make_target_dir(const char *path)
{

	make_prefixed_dir(target_prefix(), path);
}


static int
do_target_chdir(const char *dir, int must_succeed)
{
	const char *tgt_dir;
	int error;

	error = 0;
	tgt_dir = target_expand(dir);

#ifndef DEBUG
	/* chdir returns -1 on error and sets errno. */
	if (chdir(tgt_dir) < 0)
		error = errno;
	if (logfp) {
		fprintf(logfp, "cd to %s\n", tgt_dir);
		fflush(logfp);
	}
	if (script) {
		scripting_fprintf(NULL, "cd %s\n", tgt_dir);
		fflush(script);
	}

	if (error && must_succeed) {
		fprintf(stderr, msg_string(MSG_realdir),
		       target_prefix(), strerror(error));
		if (logfp)
			fprintf(logfp, msg_string(MSG_realdir),
			       target_prefix(), strerror(error));
		exit(1);
	}
	errno = error;
	return (error);
#else
	printf("target_chdir (%s)\n", tgt_dir);
	return (0);
#endif
}

void
target_chdir_or_die(const char *dir)
{

	(void)do_target_chdir(dir, 1);
}

#ifdef notdef
int
target_chdir(const char *dir)
{

	return do_target_chdir(dir, 0);
}
#endif

/*
 * Copy a file from the current root into the target system,
 * where the  destination pathname is relative to the target root.
 * Does not check for copy-to-self when target is  current root.
 */
int
cp_to_target(const char *srcpath, const char *tgt_path)
{
	const char *real_path = target_expand(tgt_path);

	return run_program(0, "/bin/cp %s %s", srcpath, real_path);
}

/*
 * Duplicate a file from the current root to the same pathname
 * in the target system.  Pathname must be an absolute pathname.
 * If we're running in the target, do nothing. 
 */
void
dup_file_into_target(const char *filename)
{

	if (!target_already_root())
		cp_to_target(filename, filename);
}


/*
 * Do a mv where both pathnames are within the target filesystem.
 */
void
mv_within_target_or_die(const char *frompath, const char *topath)
{
	char realfrom[STRSIZE];
	char realto[STRSIZE];

	strlcpy(realfrom, target_expand(frompath), sizeof realfrom);
	strlcpy(realto, target_expand(topath), sizeof realto);

	run_program(RUN_FATAL, "mv %s %s", realfrom, realto);
}

/* Do a cp where both pathnames are within the target filesystem. */
int
cp_within_target(const char *frompath, const char *topath, int optional)
{
	char realfrom[STRSIZE];
	char realto[STRSIZE];

	strncpy(realfrom, target_expand(frompath), STRSIZE);
	strncpy(realto, target_expand(topath), STRSIZE);

	if (access(realfrom, R_OK) == -1 && optional)
		return 0;
	return (run_program(0, "cp -p %s %s", realfrom, realto));
}

/* fopen a pathname in the target. */
FILE *
target_fopen(const char *filename, const char *type)
{

	return fopen(target_expand(filename), type);
}

/*
 * Do a mount onto a mountpoint in the install target.
 * Record mountpoint so we can unmount when finished.
 * NB: does not prefix mount-from, which probably breaks nullfs mounts.
 */
int
target_mount(const char *opts, const char *from, int ptn, const char *on)
{
	struct unwind_mount *m;
	int error;
	int len;

	len = strlen(on);
	m = malloc(sizeof *m + len);
	if (m == 0)
		return (ENOMEM);	/* XXX */

	memcpy(m->um_mountpoint, on, len + 1);

#ifdef DEBUG_UNWIND
	endwin();
	fprintf(stderr, "mounting %s with unwind\n", on);
	backtowin();
#endif

	error = run_program(0, "/sbin/mount %s /dev/%s%c %s%s",
			opts, from, 'a' + ptn, target_prefix(), on);
	if (error) {
		free(m);
		return error;
	}
	m->um_prev = unwind_mountlist;
	unwind_mountlist = m;
	return 0;
}

/*
 * unwind the mount stack, unmounting mounted filesystems.
 * For now, ignore any errors in unmount. 
 * (Why would we be unable to unmount?  The user has suspended
 *  us and forked shell sitting somewhere in the target root?)
 */
void
unwind_mounts(void)
{
	struct unwind_mount *m;
	static volatile int unwind_in_progress = 0;

	/* signal safety */
	if (unwind_in_progress)
		return;
	unwind_in_progress = 1;

	while ((m = unwind_mountlist) != NULL) {
		unwind_mountlist = m->um_prev;
#ifdef DEBUG_UNWIND
		endwin();
		fprintf(stderr, "unmounting %s\n", m->um_mountpoint);
		backtowin();
#endif
		run_program(0, "/sbin/umount %s%s",
			target_prefix(), m->um_mountpoint);
		free(m);
	}
	unwind_in_progress = 0;
}

int
target_collect_file(int kind, char **buffer, const char *name)
{
	const char *realname = target_expand(name);

#ifdef	DEBUG
	printf("collect real name %s\n", realname);
#endif
	return collect(kind, buffer, "%s", realname);
}

/*
 * Verify a pathname already exists in the target root filesystem,
 * by running  test "testflag" on the expanded target pathname.
 */
int
target_test(unsigned int mode, const char *path)
{
	const char *real_path = target_expand(path);
	register int result;

	result = !file_mode_match(real_path, mode);
	scripting_fprintf(NULL, "if [ $? != 0 ]; then echo \"%s does not exist!\"; fi\n", real_path);

#if defined(DEBUG)
	printf("target_test(%o, %s) returning %d\n", mode, real_path, result);
#endif
	return (result);
}

/*
 * Verify a directory already exists in the target root 
 * filesystem. Do not create the directory if it doesn't  exist.
 * Assumes that sysinst has already mounted the target root.
 */
int
target_test_dir(const char *path)
{

 	return target_test(S_IFDIR, path);
}

/*
 * Verify an ordinary file already exists in the target root 
 * filesystem. Do not create the directory if it doesn't  exist.
 * Assumes that sysinst has already mounted the target root.
 */
int
target_test_file(const char *path)
{

 	return target_test(S_IFREG, path);
}

int
target_test_symlink(const char *path)
{

 	return target_test(S_IFLNK, path);
}

int
target_file_exists_p(const char *path)
{

	return (target_test_file(path) == 0);
}

int
target_dir_exists_p(const char *path)
{

	return (target_test_dir(path) == 0);
}

int
target_symlink_exists_p(const char *path)
{

	return (target_test_symlink(path) == 0);
}

int
target_mounted(void)
{
	return (unwind_mountlist != NULL);
}