569 lines
16 KiB
C
569 lines
16 KiB
C
/* $NetBSD: walk.c,v 1.17 2004/06/20 22:20:18 jmc Exp $ */
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/*
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* Copyright (c) 2001 Wasabi Systems, Inc.
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* All rights reserved.
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*
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* Written by Luke Mewburn for Wasabi Systems, Inc.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed for the NetBSD Project by
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* Wasabi Systems, Inc.
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* 4. The name of Wasabi Systems, Inc. may not be used to endorse
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* or promote products derived from this software without specific prior
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* written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL WASABI SYSTEMS, INC
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* The function link_check() was inspired from NetBSD's usr.bin/du/du.c,
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* which has the following copyright notice:
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*
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*
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* Copyright (c) 1989, 1993, 1994
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Chris Newcomb.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <assert.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <dirent.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include "makefs.h"
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#include "mtree.h"
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#include "extern.h" /* NB: mtree */
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static void apply_specdir(const char *, NODE *, fsnode *);
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static void apply_specentry(const char *, NODE *, fsnode *);
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static fsnode *create_fsnode(const char *, struct stat *);
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static fsinode *link_check(fsinode *);
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/*
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* walk_dir --
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* build a tree of fsnodes from `dir', with a parent fsnode of `parent'
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* (which may be NULL for the root of the tree).
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* each "level" is a directory, with the "." entry guaranteed to be
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* at the start of the list, and without ".." entries.
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*/
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fsnode *
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walk_dir(const char *dir, fsnode *parent)
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{
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fsnode *first, *cur, *prev;
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DIR *dirp;
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struct dirent *dent;
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char path[MAXPATHLEN + 1];
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struct stat stbuf;
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assert(dir != NULL);
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if (debug & DEBUG_WALK_DIR)
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printf("walk_dir: %s %p\n", dir, parent);
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if ((dirp = opendir(dir)) == NULL)
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err(1, "Can't opendir `%s'", dir);
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first = prev = NULL;
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while ((dent = readdir(dirp)) != NULL) {
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if (strcmp(dent->d_name, "..") == 0)
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continue;
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if (debug & DEBUG_WALK_DIR_NODE)
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printf("scanning %s/%s\n", dir, dent->d_name);
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if (snprintf(path, sizeof(path), "%s/%s", dir, dent->d_name)
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>= sizeof(path))
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errx(1, "Pathname too long.");
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if (lstat(path, &stbuf) == -1)
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err(1, "Can't lstat `%s'", path);
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#ifdef S_ISSOCK
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if (S_ISSOCK(stbuf.st_mode & S_IFMT)) {
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if (debug & DEBUG_WALK_DIR_NODE)
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printf(" skipping socket %s\n", path);
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continue;
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}
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#endif
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cur = create_fsnode(dent->d_name, &stbuf);
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cur->parent = parent;
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if (strcmp(dent->d_name, ".") == 0) {
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/* ensure "." is at the start of the list */
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cur->next = first;
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first = cur;
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if (! prev)
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prev = cur;
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} else { /* not "." */
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if (prev)
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prev->next = cur;
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prev = cur;
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if (!first)
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first = cur;
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if (S_ISDIR(cur->type)) {
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cur->child = walk_dir(path, cur);
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continue;
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}
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}
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if (stbuf.st_nlink > 1) {
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fsinode *curino;
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curino = link_check(cur->inode);
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if (curino != NULL) {
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free(cur->inode);
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cur->inode = curino;
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cur->inode->nlink++;
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}
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}
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if (S_ISLNK(cur->type)) {
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char slink[PATH_MAX+1];
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int llen;
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llen = readlink(path, slink, sizeof(slink) - 1);
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if (llen == -1)
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err(1, "Readlink `%s'", path);
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slink[llen] = '\0';
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if ((cur->symlink = strdup(slink)) == NULL)
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err(1, "Memory allocation error");
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}
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}
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for (cur = first; cur != NULL; cur = cur->next)
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cur->first = first;
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if (closedir(dirp) == -1)
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err(1, "Can't closedir `%s'", dir);
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return (first);
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}
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static fsnode *
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create_fsnode(const char *name, struct stat *stbuf)
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{
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fsnode *cur;
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if ((cur = calloc(1, sizeof(fsnode))) == NULL ||
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(cur->name = strdup(name)) == NULL ||
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(cur->inode = calloc(1, sizeof(fsinode))) == NULL)
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err(1, "Memory allocation error");
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cur->type = stbuf->st_mode & S_IFMT;
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cur->inode->nlink = 1;
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cur->inode->st = *stbuf;
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return (cur);
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}
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/*
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* apply_specfile --
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* read in the mtree(8) specfile, and apply it to the tree
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* at dir,parent. parameters in parent on equivalent types
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* will be changed to those found in specfile, and missing
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* entries will be added.
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*/
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void
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apply_specfile(const char *specfile, const char *dir, fsnode *parent)
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{
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struct timeval start;
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FILE *fp;
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NODE *root;
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assert(specfile != NULL);
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assert(parent != NULL);
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if (debug & DEBUG_APPLY_SPECFILE)
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printf("apply_specfile: %s, %s %p\n", specfile, dir, parent);
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/* read in the specfile */
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if ((fp = fopen(specfile, "r")) == NULL)
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err(1, "Can't open `%s'", specfile);
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TIMER_START(start);
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root = mtree_readspec(fp);
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TIMER_RESULTS(start, "spec");
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if (fclose(fp) == EOF)
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err(1, "Can't close `%s'", specfile);
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/* perform some sanity checks */
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if (root == NULL)
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errx(1, "Specfile `%s' did not contain a tree", specfile);
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assert(strcmp(root->name, ".") == 0);
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assert(root->type == F_DIR);
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/* merge in the changes */
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apply_specdir(dir, root, parent);
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}
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static u_int
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nodetoino(u_int type)
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{
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switch (type) {
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case F_BLOCK:
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return S_IFBLK;
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case F_CHAR:
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return S_IFCHR;
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case F_DIR:
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return S_IFDIR;
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case F_FIFO:
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return S_IFIFO;
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case F_FILE:
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return S_IFREG;
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case F_LINK:
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return S_IFLNK;
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case F_SOCK:
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return S_IFSOCK;
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default:
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printf("unknown type %d", type);
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abort();
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}
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/* NOTREACHED */
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}
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static void
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apply_specdir(const char *dir, NODE *specnode, fsnode *dirnode)
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{
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char path[MAXPATHLEN + 1];
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NODE *curnode;
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fsnode *curfsnode;
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assert(specnode != NULL);
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assert(dirnode != NULL);
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if (debug & DEBUG_APPLY_SPECFILE)
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printf("apply_specdir: %s %p %p\n", dir, specnode, dirnode);
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if (specnode->type != F_DIR)
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errx(1, "Specfile node `%s/%s' is not a directory",
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dir, specnode->name);
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if (dirnode->type != S_IFDIR)
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errx(1, "Directory node `%s/%s' is not a directory",
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dir, dirnode->name);
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apply_specentry(dir, specnode, dirnode);
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/* now walk specnode->child matching up with dirnode */
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for (curnode = specnode->child; curnode != NULL;
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curnode = curnode->next) {
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if (debug & DEBUG_APPLY_SPECENTRY)
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printf("apply_specdir: spec %s\n",
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curnode->name);
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for (curfsnode = dirnode->next; curfsnode != NULL;
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curfsnode = curfsnode->next) {
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#if 0 /* too verbose for now */
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if (debug & DEBUG_APPLY_SPECENTRY)
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printf("apply_specdir: dirent %s\n",
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curfsnode->name);
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#endif
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if (strcmp(curnode->name, curfsnode->name) == 0)
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break;
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}
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if (snprintf(path, sizeof(path), "%s/%s",
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dir, curnode->name) >= sizeof(path))
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errx(1, "Pathname too long.");
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if (curfsnode == NULL) { /* need new entry */
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struct stat stbuf;
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/*
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* don't add optional spec entries
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* that lack an existing fs entry
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*/
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if ((curnode->flags & F_OPT) &&
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lstat(path, &stbuf) == -1)
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continue;
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/* check that enough info is provided */
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#define NODETEST(t, m) \
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if (!(t)) \
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errx(1, "`%s': %s not provided", path, m)
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NODETEST(curnode->flags & F_TYPE, "type");
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NODETEST(curnode->flags & F_MODE, "mode");
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/* XXX: require F_TIME ? */
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NODETEST(curnode->flags & F_GID ||
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curnode->flags & F_GNAME, "group");
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NODETEST(curnode->flags & F_UID ||
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curnode->flags & F_UNAME, "user");
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#undef NODETEST
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if (debug & DEBUG_APPLY_SPECFILE)
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printf("apply_specdir: adding %s\n",
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curnode->name);
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/* build minimal fsnode */
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memset(&stbuf, 0, sizeof(stbuf));
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stbuf.st_mode = nodetoino(curnode->type);
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stbuf.st_nlink = 1;
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stbuf.st_mtime = stbuf.st_atime =
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stbuf.st_ctime = start_time.tv_sec;
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#if HAVE_STRUCT_STAT_ST_MTIMENSEC
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stbuf.st_mtimensec = stbuf.st_atimensec =
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stbuf.st_ctimensec = start_time.tv_nsec;
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#endif
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curfsnode = create_fsnode(curnode->name, &stbuf);
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curfsnode->parent = dirnode->parent;
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curfsnode->first = dirnode;
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curfsnode->next = dirnode->next;
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dirnode->next = curfsnode;
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if (curfsnode->type == S_IFDIR) {
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/* for dirs, make "." entry as well */
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curfsnode->child = create_fsnode(".", &stbuf);
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curfsnode->child->parent = curfsnode;
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curfsnode->child->first = curfsnode->child;
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}
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if (curfsnode->type == S_IFLNK) {
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assert(curnode->slink != NULL);
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/* for symlinks, copy the target */
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if ((curfsnode->symlink =
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strdup(curnode->slink)) == NULL)
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err(1, "Memory allocation error");
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}
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}
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apply_specentry(dir, curnode, curfsnode);
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if (curnode->type == F_DIR) {
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if (curfsnode->type != S_IFDIR)
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errx(1, "`%s' is not a directory", path);
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assert (curfsnode->child != NULL);
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apply_specdir(path, curnode, curfsnode->child);
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}
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}
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}
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static void
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apply_specentry(const char *dir, NODE *specnode, fsnode *dirnode)
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{
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assert(specnode != NULL);
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assert(dirnode != NULL);
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if (nodetoino(specnode->type) != dirnode->type)
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errx(1, "`%s/%s' type mismatch: specfile %s, tree %s",
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dir, specnode->name, inode_type(nodetoino(specnode->type)),
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inode_type(dirnode->type));
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if (debug & DEBUG_APPLY_SPECENTRY)
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printf("apply_specentry: %s/%s\n", dir, dirnode->name);
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#define ASEPRINT(t, b, o, n) \
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if (debug & DEBUG_APPLY_SPECENTRY) \
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printf("\t\t\tchanging %s from " b " to " b "\n", \
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t, o, n)
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if (specnode->flags & (F_GID | F_GNAME)) {
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ASEPRINT("gid", "%d",
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dirnode->inode->st.st_gid, specnode->st_gid);
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dirnode->inode->st.st_gid = specnode->st_gid;
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}
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if (specnode->flags & F_MODE) {
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ASEPRINT("mode", "%#o",
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dirnode->inode->st.st_mode & ALLPERMS, specnode->st_mode);
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dirnode->inode->st.st_mode &= ~ALLPERMS;
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dirnode->inode->st.st_mode |= (specnode->st_mode & ALLPERMS);
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}
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/* XXX: ignoring F_NLINK for now */
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if (specnode->flags & F_SIZE) {
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ASEPRINT("size", "%lld",
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(long long)dirnode->inode->st.st_size,
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(long long)specnode->st_size);
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dirnode->inode->st.st_size = specnode->st_size;
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}
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if (specnode->flags & F_SLINK) {
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assert(dirnode->symlink != NULL);
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assert(specnode->slink != NULL);
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ASEPRINT("symlink", "%s", dirnode->symlink, specnode->slink);
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free(dirnode->symlink);
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if ((dirnode->symlink = strdup(specnode->slink)) == NULL)
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err(1, "Memory allocation error");
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}
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if (specnode->flags & F_TIME) {
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ASEPRINT("time", "%ld",
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(long)dirnode->inode->st.st_mtime,
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(long)specnode->st_mtimespec.tv_sec);
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dirnode->inode->st.st_mtime = specnode->st_mtimespec.tv_sec;
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dirnode->inode->st.st_atime = specnode->st_mtimespec.tv_sec;
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dirnode->inode->st.st_ctime = start_time.tv_sec;
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#if HAVE_STRUCT_STAT_ST_MTIMENSEC
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dirnode->inode->st.st_mtimensec = specnode->st_mtimespec.tv_nsec;
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dirnode->inode->st.st_atimensec = specnode->st_mtimespec.tv_nsec;
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dirnode->inode->st.st_ctimensec = start_time.tv_nsec;
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#endif
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}
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if (specnode->flags & (F_UID | F_UNAME)) {
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ASEPRINT("uid", "%d",
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dirnode->inode->st.st_uid, specnode->st_uid);
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dirnode->inode->st.st_uid = specnode->st_uid;
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}
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#if HAVE_STRUCT_STAT_ST_FLAGS
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if (specnode->flags & F_FLAGS) {
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ASEPRINT("flags", "%#lX",
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(unsigned long)dirnode->inode->st.st_flags,
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(unsigned long)specnode->st_flags);
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dirnode->inode->st.st_flags = specnode->st_flags;
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}
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#endif
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#undef ASEPRINT
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dirnode->flags |= FSNODE_F_HASSPEC;
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}
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/*
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* dump_fsnodes --
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* dump the fsnodes from `cur', based in the directory `dir'
|
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*/
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void
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dump_fsnodes(const char *dir, fsnode *root)
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{
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fsnode *cur;
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char path[MAXPATHLEN + 1];
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assert (dir != NULL);
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printf("dump_fsnodes: %s %p\n", dir, root);
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for (cur = root; cur != NULL; cur = cur->next) {
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if (snprintf(path, sizeof(path), "%s/%s", dir, cur->name)
|
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>= sizeof(path))
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errx(1, "Pathname too long.");
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|
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if (debug & DEBUG_DUMP_FSNODES_VERBOSE)
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printf("cur=%8p parent=%8p first=%8p ",
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cur, cur->parent, cur->first);
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printf("%7s: %s", inode_type(cur->type), path);
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if (S_ISLNK(cur->type)) {
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assert(cur->symlink != NULL);
|
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printf(" -> %s", cur->symlink);
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} else {
|
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assert (cur->symlink == NULL);
|
|
}
|
|
if (cur->inode->nlink > 1)
|
|
printf(", nlinks=%d", cur->inode->nlink);
|
|
putchar('\n');
|
|
|
|
if (cur->child) {
|
|
assert (cur->type == S_IFDIR);
|
|
dump_fsnodes(path, cur->child);
|
|
}
|
|
}
|
|
printf("dump_fsnodes: finished %s\n", dir);
|
|
}
|
|
|
|
|
|
/*
|
|
* inode_type --
|
|
* for a given inode type `mode', return a descriptive string.
|
|
*/
|
|
const char *
|
|
inode_type(mode_t mode)
|
|
{
|
|
|
|
if (S_ISREG(mode))
|
|
return ("file");
|
|
if (S_ISLNK(mode))
|
|
return ("symlink");
|
|
if (S_ISDIR(mode))
|
|
return ("dir");
|
|
if (S_ISLNK(mode))
|
|
return ("link");
|
|
if (S_ISFIFO(mode))
|
|
return ("fifo");
|
|
if (S_ISSOCK(mode))
|
|
return ("socket");
|
|
/* XXX should not happen but handle them */
|
|
if (S_ISCHR(mode))
|
|
return ("char");
|
|
if (S_ISBLK(mode))
|
|
return ("block");
|
|
return ("unknown");
|
|
}
|
|
|
|
|
|
/*
|
|
* link_check --
|
|
* return pointer to fsnode matching `entry's st_ino & st_dev if it exists,
|
|
* otherwise add `entry' to table and return NULL
|
|
*/
|
|
static fsinode *
|
|
link_check(fsinode *entry)
|
|
{
|
|
static struct dupnode {
|
|
uint32_t dev;
|
|
uint64_t ino;
|
|
fsinode *dup;
|
|
} *dups, *newdups;
|
|
static int ndups, maxdups;
|
|
|
|
int i;
|
|
|
|
assert (entry != NULL);
|
|
|
|
/* XXX; maybe traverse in reverse for speed? */
|
|
for (i = 0; i < ndups; i++) {
|
|
if (dups[i].dev == entry->st.st_dev &&
|
|
dups[i].ino == entry->st.st_ino) {
|
|
if (debug & DEBUG_WALK_DIR_LINKCHECK)
|
|
printf("link_check: found [%d,%d]\n",
|
|
entry->st.st_dev, entry->st.st_ino);
|
|
return (dups[i].dup);
|
|
}
|
|
}
|
|
|
|
if (debug & DEBUG_WALK_DIR_LINKCHECK)
|
|
printf("link_check: no match for [%d, %d]\n",
|
|
entry->st.st_dev, entry->st.st_ino);
|
|
if (ndups == maxdups) {
|
|
if ((newdups = realloc(dups, sizeof(struct dupnode) * (maxdups + 128)))
|
|
== NULL)
|
|
err(1, "Memory allocation error");
|
|
dups = newdups;
|
|
maxdups += 128;
|
|
}
|
|
dups[ndups].dev = entry->st.st_dev;
|
|
dups[ndups].ino = entry->st.st_ino;
|
|
dups[ndups].dup = entry;
|
|
ndups++;
|
|
|
|
return (NULL);
|
|
}
|