692 lines
19 KiB
C
692 lines
19 KiB
C
/* $NetBSD: walk.c,v 1.28 2013/02/03 06:16:53 christos 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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#if HAVE_NBTOOL_CONFIG_H
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#include "nbtool_config.h"
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#endif
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#include <sys/cdefs.h>
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#if defined(__RCSID) && !defined(__lint)
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__RCSID("$NetBSD: walk.c,v 1.28 2013/02/03 06:16:53 christos Exp $");
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#endif /* !__lint */
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#include <sys/param.h>
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#include <sys/stat.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 <util.h>
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#include "makefs.h"
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#include "mtree.h"
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static void apply_specdir(const char *, NODE *, fsnode *, int);
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static void apply_specentry(const char *, NODE *, fsnode *);
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static fsnode *create_fsnode(const char *, const char *, const char *,
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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 `root' and `dir', with a parent
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* fsnode of `parent' (which may be NULL for the root of the tree).
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* append the tree to a fsnode of `join' if it is not NULL.
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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 *root, const char *dir, fsnode *parent, fsnode *join,
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int replace)
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{
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fsnode *first, *cur, *prev, *last;
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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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char *name, *rp;
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int dot, len;
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assert(root != NULL);
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assert(dir != NULL);
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len = snprintf(path, sizeof(path), "%s/%s", root, dir);
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if (len >= (int)sizeof(path))
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errx(1, "Pathname too long.");
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if (debug & DEBUG_WALK_DIR)
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printf("walk_dir: %s %p\n", path, parent);
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if ((dirp = opendir(path)) == NULL)
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err(1, "Can't opendir `%s'", path);
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rp = path + strlen(root) + 1;
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if (join != NULL) {
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first = cur = join;
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while (cur->next != NULL)
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cur = cur->next;
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prev = last = cur;
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} else
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last = first = prev = NULL;
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while ((dent = readdir(dirp)) != NULL) {
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name = dent->d_name;
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dot = 0;
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if (name[0] == '.')
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switch (name[1]) {
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case '\0': /* "." */
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if (join != NULL)
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continue;
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dot = 1;
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break;
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case '.': /* ".." */
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if (name[2] == '\0')
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continue;
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/* FALLTHROUGH */
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default:
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dot = 0;
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}
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if (debug & DEBUG_WALK_DIR_NODE)
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printf("scanning %s/%s/%s\n", root, dir, name);
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if (snprintf(path + len, sizeof(path) - len, "/%s", name) >=
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(int)sizeof(path) - len)
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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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if (join != NULL) {
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cur = join->next;
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for (;;) {
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if (cur == NULL || strcmp(cur->name, name) == 0)
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break;
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if (cur == last) {
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cur = NULL;
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break;
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}
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cur = cur->next;
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}
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if (cur != NULL) {
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if (S_ISDIR(cur->type) &&
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S_ISDIR(stbuf.st_mode)) {
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if (debug & DEBUG_WALK_DIR_NODE)
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printf("merging %s with %p\n",
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path, cur->child);
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cur->child = walk_dir(root, rp, cur,
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cur->child, replace);
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continue;
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}
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if (!replace)
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errx(1, "Can't merge %s `%s' with "
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"existing %s",
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inode_type(stbuf.st_mode), path,
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inode_type(cur->type));
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else {
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if (debug & DEBUG_WALK_DIR_NODE)
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printf("replacing %s %s\n",
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inode_type(stbuf.st_mode),
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path);
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if (cur == join->next)
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join->next = cur->next;
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else {
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fsnode *p;
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for (p = join->next;
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p->next != cur; p = p->next)
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continue;
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p->next = cur->next;
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}
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free(cur);
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}
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}
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}
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cur = create_fsnode(root, dir, name, &stbuf);
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cur->parent = parent;
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if (dot) {
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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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cur->first = first;
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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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cur->first = first;
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if (S_ISDIR(cur->type)) {
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cur->child = walk_dir(root, rp, cur, NULL,
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replace);
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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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if (debug & DEBUG_WALK_DIR_LINKCHECK)
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printf("link_check: found [%llu, %llu]\n",
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(unsigned long long)curino->st.st_dev,
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(unsigned long long)curino->st.st_ino);
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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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cur->symlink = estrdup(slink);
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}
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}
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assert(first != NULL);
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if (join == NULL)
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for (cur = first->next; 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/%s'", root, 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 *root, const char *path, const char *name,
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struct stat *stbuf)
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{
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fsnode *cur;
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cur = ecalloc(1, sizeof(*cur));
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cur->path = estrdup(path);
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cur->name = estrdup(name);
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cur->inode = ecalloc(1, sizeof(*cur->inode));
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cur->root = root;
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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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* free_fsnodes --
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* Removes node from tree and frees it and all of
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* its decendents.
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*/
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void
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free_fsnodes(fsnode *node)
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{
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fsnode *cur, *next;
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assert(node != NULL);
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/* for ".", start with actual parent node */
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if (node->first == node) {
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assert(node->name[0] == '.' && node->name[1] == '\0');
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if (node->parent) {
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assert(node->parent->child == node);
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node = node->parent;
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}
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}
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/* Find ourselves in our sibling list and unlink */
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if (node->first != node) {
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for (cur = node->first; cur->next; cur = cur->next) {
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if (cur->next == node) {
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cur->next = node->next;
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node->next = NULL;
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break;
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}
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}
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}
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for (cur = node; cur != NULL; cur = next) {
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next = cur->next;
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if (cur->child) {
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cur->child->parent = NULL;
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free_fsnodes(cur->child);
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}
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if (cur->inode->nlink-- == 1)
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free(cur->inode);
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if (cur->symlink)
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free(cur->symlink);
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free(cur->path);
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free(cur->name);
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free(cur);
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}
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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, int speconly)
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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 = spec(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, speconly);
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free_nodes(root);
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}
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static void
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apply_specdir(const char *dir, NODE *specnode, fsnode *dirnode, int speconly)
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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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/* Remove any filesystem nodes not found in specfile */
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/* XXX inefficient. This is O^2 in each dir and it would
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* have been better never to have walked this part of the tree
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* to begin with
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*/
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if (speconly) {
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fsnode *next;
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assert(dirnode->name[0] == '.' && dirnode->name[1] == '\0');
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for (curfsnode = dirnode->next; curfsnode != NULL; curfsnode = next) {
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next = curfsnode->next;
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for (curnode = specnode->child; curnode != NULL;
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curnode = curnode->next) {
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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 (curnode == NULL) {
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if (debug & DEBUG_APPLY_SPECONLY) {
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printf("apply_specdir: trimming %s/%s %p\n", dir, curfsnode->name, curfsnode);
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}
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free_fsnodes(curfsnode);
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}
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}
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}
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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 ((size_t)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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if (curnode->type == F_BLOCK || curnode->type == F_CHAR)
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NODETEST(curnode->flags & F_DEV,
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"device number");
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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,
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&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(".", ".", ".",
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&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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curfsnode->symlink = estrdup(curnode->slink);
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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, speconly);
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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)) {
|
|
ASEPRINT("gid", "%d",
|
|
dirnode->inode->st.st_gid, specnode->st_gid);
|
|
dirnode->inode->st.st_gid = specnode->st_gid;
|
|
}
|
|
if (specnode->flags & F_MODE) {
|
|
ASEPRINT("mode", "%#o",
|
|
dirnode->inode->st.st_mode & ALLPERMS, specnode->st_mode);
|
|
dirnode->inode->st.st_mode &= ~ALLPERMS;
|
|
dirnode->inode->st.st_mode |= (specnode->st_mode & ALLPERMS);
|
|
}
|
|
/* XXX: ignoring F_NLINK for now */
|
|
if (specnode->flags & F_SIZE) {
|
|
ASEPRINT("size", "%lld",
|
|
(long long)dirnode->inode->st.st_size,
|
|
(long long)specnode->st_size);
|
|
dirnode->inode->st.st_size = specnode->st_size;
|
|
}
|
|
if (specnode->flags & F_SLINK) {
|
|
assert(dirnode->symlink != NULL);
|
|
assert(specnode->slink != NULL);
|
|
ASEPRINT("symlink", "%s", dirnode->symlink, specnode->slink);
|
|
free(dirnode->symlink);
|
|
dirnode->symlink = estrdup(specnode->slink);
|
|
}
|
|
if (specnode->flags & F_TIME) {
|
|
ASEPRINT("time", "%ld",
|
|
(long)dirnode->inode->st.st_mtime,
|
|
(long)specnode->st_mtimespec.tv_sec);
|
|
dirnode->inode->st.st_mtime = specnode->st_mtimespec.tv_sec;
|
|
dirnode->inode->st.st_atime = specnode->st_mtimespec.tv_sec;
|
|
dirnode->inode->st.st_ctime = start_time.tv_sec;
|
|
#if HAVE_STRUCT_STAT_ST_MTIMENSEC
|
|
dirnode->inode->st.st_mtimensec = specnode->st_mtimespec.tv_nsec;
|
|
dirnode->inode->st.st_atimensec = specnode->st_mtimespec.tv_nsec;
|
|
dirnode->inode->st.st_ctimensec = start_time.tv_nsec;
|
|
#endif
|
|
}
|
|
if (specnode->flags & (F_UID | F_UNAME)) {
|
|
ASEPRINT("uid", "%d",
|
|
dirnode->inode->st.st_uid, specnode->st_uid);
|
|
dirnode->inode->st.st_uid = specnode->st_uid;
|
|
}
|
|
#if HAVE_STRUCT_STAT_ST_FLAGS
|
|
if (specnode->flags & F_FLAGS) {
|
|
ASEPRINT("flags", "%#lX",
|
|
(unsigned long)dirnode->inode->st.st_flags,
|
|
(unsigned long)specnode->st_flags);
|
|
dirnode->inode->st.st_flags = specnode->st_flags;
|
|
}
|
|
#endif
|
|
if (specnode->flags & F_DEV) {
|
|
ASEPRINT("rdev", "%#llx",
|
|
(unsigned long long)dirnode->inode->st.st_rdev,
|
|
(unsigned long long)specnode->st_rdev);
|
|
dirnode->inode->st.st_rdev = specnode->st_rdev;
|
|
}
|
|
#undef ASEPRINT
|
|
|
|
dirnode->flags |= FSNODE_F_HASSPEC;
|
|
}
|
|
|
|
|
|
/*
|
|
* dump_fsnodes --
|
|
* dump the fsnodes from `cur'
|
|
*/
|
|
void
|
|
dump_fsnodes(fsnode *root)
|
|
{
|
|
fsnode *cur;
|
|
char path[MAXPATHLEN + 1];
|
|
|
|
printf("dump_fsnodes: %s %p\n", root->path, root);
|
|
for (cur = root; cur != NULL; cur = cur->next) {
|
|
if (snprintf(path, sizeof(path), "%s/%s", cur->path,
|
|
cur->name) >= (int)sizeof(path))
|
|
errx(1, "Pathname too long.");
|
|
|
|
if (debug & DEBUG_DUMP_FSNODES_VERBOSE)
|
|
printf("cur=%8p parent=%8p first=%8p ",
|
|
cur, cur->parent, cur->first);
|
|
printf("%7s: %s", inode_type(cur->type), path);
|
|
if (S_ISLNK(cur->type)) {
|
|
assert(cur->symlink != NULL);
|
|
printf(" -> %s", cur->symlink);
|
|
} else {
|
|
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(cur->child);
|
|
}
|
|
}
|
|
printf("dump_fsnodes: finished %s/%s\n", root->path, root->name);
|
|
}
|
|
|
|
|
|
/*
|
|
* inode_type --
|
|
* for a given inode type `mode', return a descriptive string.
|
|
* for most cases, uses inotype() from mtree/misc.c
|
|
*/
|
|
const char *
|
|
inode_type(mode_t mode)
|
|
{
|
|
|
|
if (S_ISLNK(mode))
|
|
return ("symlink"); /* inotype() returns "link"... */
|
|
return (inotype(mode));
|
|
}
|
|
|
|
|
|
/*
|
|
* link_check --
|
|
* return pointer to fsinode matching `entry's st_ino & st_dev if it exists,
|
|
* otherwise add `entry' to table and return NULL
|
|
*/
|
|
/* This was borrowed from du.c and tweaked to keep an fsnode
|
|
* pointer instead. -- dbj@netbsd.org
|
|
*/
|
|
static fsinode *
|
|
link_check(fsinode *entry)
|
|
{
|
|
static struct entry {
|
|
fsinode *data;
|
|
} *htable;
|
|
static int htshift; /* log(allocated size) */
|
|
static int htmask; /* allocated size - 1 */
|
|
static int htused; /* 2*number of insertions */
|
|
int h, h2;
|
|
uint64_t tmp;
|
|
/* this constant is (1<<64)/((1+sqrt(5))/2)
|
|
* aka (word size)/(golden ratio)
|
|
*/
|
|
const uint64_t HTCONST = 11400714819323198485ULL;
|
|
const int HTBITS = 64;
|
|
|
|
/* Never store zero in hashtable */
|
|
assert(entry);
|
|
|
|
/* Extend hash table if necessary, keep load under 0.5 */
|
|
if (htused<<1 >= htmask) {
|
|
struct entry *ohtable;
|
|
|
|
if (!htable)
|
|
htshift = 10; /* starting hashtable size */
|
|
else
|
|
htshift++; /* exponential hashtable growth */
|
|
|
|
htmask = (1 << htshift) - 1;
|
|
htused = 0;
|
|
|
|
ohtable = htable;
|
|
htable = ecalloc(htmask+1, sizeof(*htable));
|
|
/* populate newly allocated hashtable */
|
|
if (ohtable) {
|
|
int i;
|
|
for (i = 0; i <= htmask>>1; i++)
|
|
if (ohtable[i].data)
|
|
link_check(ohtable[i].data);
|
|
free(ohtable);
|
|
}
|
|
}
|
|
|
|
/* multiplicative hashing */
|
|
tmp = entry->st.st_dev;
|
|
tmp <<= HTBITS>>1;
|
|
tmp |= entry->st.st_ino;
|
|
tmp *= HTCONST;
|
|
h = tmp >> (HTBITS - htshift);
|
|
h2 = 1 | ( tmp >> (HTBITS - (htshift<<1) - 1)); /* must be odd */
|
|
|
|
/* open address hashtable search with double hash probing */
|
|
while (htable[h].data) {
|
|
if ((htable[h].data->st.st_ino == entry->st.st_ino) &&
|
|
(htable[h].data->st.st_dev == entry->st.st_dev)) {
|
|
return htable[h].data;
|
|
}
|
|
h = (h + h2) & htmask;
|
|
}
|
|
|
|
/* Insert the current entry into hashtable */
|
|
htable[h].data = entry;
|
|
htused++;
|
|
return NULL;
|
|
}
|