usr/src/sbin/restore/utilities.c

/*
 * Copyright (c) 1983, 1993
 *      The Regents of the University of California.  All rights reserved.
 *
 * %sccs.include.redist.c%
 */

#ifndef lint
static char sccsid[] = "@(#)utilities.c 8.1 (Berkeley) %G%";
#endif /* not lint */

#include <sys/param.h>
#include <sys/stat.h>

#include <ufs/ufs/dinode.h>
#include <ufs/ufs/dir.h>

#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#include "restore.h"
#include "extern.h"

/*
 * Insure that all the components of a pathname exist.
 */
void
pathcheck(name)
        char *name;
{
        register char *cp;
        struct entry *ep;
        char *start;

        start = index(name, '/');
        if (start == 0)
                return;
        for (cp = start; *cp != '\0'; cp++) {
                if (*cp != '/')
                        continue;
                *cp = '\0';
                ep = lookupname(name);
                if (ep == NULL) {
                        ep = addentry(name, pathsearch(name)->d_ino, NODE);
                        newnode(ep);
                }
                ep->e_flags |= NEW|KEEP;
                *cp = '/';
        }
}

/*
 * Change a name to a unique temporary name.
 */
void
mktempname(ep)
        register struct entry *ep;
{
        char oldname[MAXPATHLEN];

        if (ep->e_flags & TMPNAME)
                badentry(ep, "mktempname: called with TMPNAME");
        ep->e_flags |= TMPNAME;
        (void) strcpy(oldname, myname(ep));
        freename(ep->e_name);
        ep->e_name = savename(gentempname(ep));
        ep->e_namlen = strlen(ep->e_name);
        renameit(oldname, myname(ep));
}

/*
 * Generate a temporary name for an entry.
 */
char *
gentempname(ep)
        struct entry *ep;
{
        static char name[MAXPATHLEN];
        struct entry *np;
        long i = 0;

        for (np = lookupino(ep->e_ino);
            np != NULL && np != ep; np = np->e_links)
                i++;
        if (np == NULL)
                badentry(ep, "not on ino list");
        (void) sprintf(name, "%s%d%d", TMPHDR, i, ep->e_ino);
        return (name);
}

/*
 * Rename a file or directory.
 */
void
renameit(from, to)
        char *from, *to;
{
        if (!Nflag && rename(from, to) < 0) {
                fprintf(stderr, "warning: cannot rename %s to %s: %s\n",
                    from, to, strerror(errno));
                return;
        }
        vprintf(stdout, "rename %s to %s\n", from, to);
}

/*
 * Create a new node (directory).
 */
void
newnode(np)
        struct entry *np;
{
        char *cp;

        if (np->e_type != NODE)
                badentry(np, "newnode: not a node");
        cp = myname(np);
        if (!Nflag && mkdir(cp, 0777) < 0) {
                np->e_flags |= EXISTED;
                fprintf(stderr, "warning: %s: %s\n", cp, strerror(errno));
                return;
        }
        vprintf(stdout, "Make node %s\n", cp);
}

/*
 * Remove an old node (directory).
 */
void
removenode(ep)
        register struct entry *ep;
{
        char *cp;

        if (ep->e_type != NODE)
                badentry(ep, "removenode: not a node");
        if (ep->e_entries != NULL)
                badentry(ep, "removenode: non-empty directory");
        ep->e_flags |= REMOVED;
        ep->e_flags &= ~TMPNAME;
        cp = myname(ep);
        if (!Nflag && rmdir(cp) < 0) {
                fprintf(stderr, "warning: %s: %s\n", cp, strerror(errno));
                return;
        }
        vprintf(stdout, "Remove node %s\n", cp);
}

/*
 * Remove a leaf.
 */
void
removeleaf(ep)
        register struct entry *ep;
{
        char *cp;

        if (ep->e_type != LEAF)
                badentry(ep, "removeleaf: not a leaf");
        ep->e_flags |= REMOVED;
        ep->e_flags &= ~TMPNAME;
        cp = myname(ep);
        if (!Nflag && unlink(cp) < 0) {
                fprintf(stderr, "warning: %s: %s\n", cp, strerror(errno));
                return;
        }
        vprintf(stdout, "Remove leaf %s\n", cp);
}

/*
 * Create a link.
 */
int
linkit(existing, new, type)
        char *existing, *new;
        int type;
{

        if (type == SYMLINK) {
                if (!Nflag && symlink(existing, new) < 0) {
                        fprintf(stderr,
                            "warning: cannot create symbolic link %s->%s: %s\n",
                            new, existing, strerror(errno));
                        return (FAIL);
                }
        } else if (type == HARDLINK) {
                if (!Nflag && link(existing, new) < 0) {
                        fprintf(stderr,
                            "warning: cannot create hard link %s->%s: %s\n",
                            new, existing, strerror(errno));
                        return (FAIL);
                }
        } else {
                panic("linkit: unknown type %d\n", type);
                return (FAIL);
        }
        vprintf(stdout, "Create %s link %s->%s\n",
                type == SYMLINK ? "symbolic" : "hard", new, existing);
        return (GOOD);
}

/*
 * find lowest number file (above "start") that needs to be extracted
 */
ino_t
lowerbnd(start)
        ino_t start;
{
        register struct entry *ep;

        for ( ; start < maxino; start++) {
                ep = lookupino(start);
                if (ep == NULL || ep->e_type == NODE)
                        continue;
                if (ep->e_flags & (NEW|EXTRACT))
                        return (start);
        }
        return (start);
}

/*
 * find highest number file (below "start") that needs to be extracted
 */
ino_t
upperbnd(start)
        ino_t start;
{
        register struct entry *ep;

        for ( ; start > ROOTINO; start--) {
                ep = lookupino(start);
                if (ep == NULL || ep->e_type == NODE)
                        continue;
                if (ep->e_flags & (NEW|EXTRACT))
                        return (start);
        }
        return (start);
}

/*
 * report on a badly formed entry
 */
void
badentry(ep, msg)
        register struct entry *ep;
        char *msg;
{

        fprintf(stderr, "bad entry: %s\n", msg);
        fprintf(stderr, "name: %s\n", myname(ep));
        fprintf(stderr, "parent name %s\n", myname(ep->e_parent));
        if (ep->e_sibling != NULL)
                fprintf(stderr, "sibling name: %s\n", myname(ep->e_sibling));
        if (ep->e_entries != NULL)
                fprintf(stderr, "next entry name: %s\n", myname(ep->e_entries));
        if (ep->e_links != NULL)
                fprintf(stderr, "next link name: %s\n", myname(ep->e_links));
        if (ep->e_next != NULL)
                fprintf(stderr,
                    "next hashchain name: %s\n", myname(ep->e_next));
        fprintf(stderr, "entry type: %s\n",
                ep->e_type == NODE ? "NODE" : "LEAF");
        fprintf(stderr, "inode number: %ld\n", ep->e_ino);
        panic("flags: %s\n", flagvalues(ep));
}

/*
 * Construct a string indicating the active flag bits of an entry.
 */
char *
flagvalues(ep)
        register struct entry *ep;
{
        static char flagbuf[BUFSIZ];

        (void) strcpy(flagbuf, "|NIL");
        flagbuf[0] = '\0';
        if (ep->e_flags & REMOVED)
                (void) strcat(flagbuf, "|REMOVED");
        if (ep->e_flags & TMPNAME)
                (void) strcat(flagbuf, "|TMPNAME");
        if (ep->e_flags & EXTRACT)
                (void) strcat(flagbuf, "|EXTRACT");
        if (ep->e_flags & NEW)
                (void) strcat(flagbuf, "|NEW");
        if (ep->e_flags & KEEP)
                (void) strcat(flagbuf, "|KEEP");
        if (ep->e_flags & EXISTED)
                (void) strcat(flagbuf, "|EXISTED");
        return (&flagbuf[1]);
}

/*
 * Check to see if a name is on a dump tape.
 */
ino_t
dirlookup(name)
        const char *name;
{
        ino_t ino;

        ino = pathsearch(name)->d_ino;
        if (ino == 0 || TSTINO(ino, dumpmap) == 0)
                fprintf(stderr, "%s is not on tape\n", name);
        return (ino);
}

/*
 * Elicit a reply.
 */
int
reply(question)
        char *question;
{
        char c;

        do      {
                fprintf(stderr, "%s? [yn] ", question);
                (void) fflush(stderr);
                c = getc(terminal);
                while (c != '\n' && getc(terminal) != '\n')
                        if (feof(terminal))
                                return (FAIL);
        } while (c != 'y' && c != 'n');
        if (c == 'y')
                return (GOOD);
        return (FAIL);
}

/*
 * handle unexpected inconsistencies
 */
#if __STDC__
#include <stdarg.h>
#else
#include <varargs.h>
#endif

void
#if __STDC__
panic(const char *fmt, ...)
#else
panic(fmt, va_alist)
        char *fmt;
        va_dcl
#endif
{
        va_list ap;
#if __STDC__
        va_start(ap, fmt);
#else
        va_start(ap);
#endif

        vfprintf(stderr, fmt, ap);
        if (yflag)
                return;
        if (reply("abort") == GOOD) {
                if (reply("dump core") == GOOD)
                        abort();
                done(1);
        }
}