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/*      $NetBSD: walk.c,v 1.25 2012/01/28 02:35:46 christos Exp $       */

/*

 * Copyright (c) 2001 Wasabi Systems, Inc.

 * All rights reserved.

 *

 * Written by Luke Mewburn for Wasabi Systems, Inc.

 *

 * 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

 *      Wasabi Systems, Inc.

 * 4. The name of Wasabi Systems, Inc. may not be used to endorse

 *    or promote products derived from this software without specific prior

 *    written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``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 WASABI 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.

 */

#if HAVE_NBTOOL_CONFIG_H

#include "nbtool_config.h"

#endif

#include <sys/cdefs.h>

#if defined(__RCSID) && !defined(__lint)

__RCSID("$NetBSD: walk.c,v 1.25 2012/01/28 02:35:46 christos Exp $");

#endif  /* !__lint */

#include <sys/param.h>

#include <assert.h>

#include <errno.h>

#include <fcntl.h>

#include <stdio.h>

#include <dirent.h>

#include <stdlib.h>

#include <string.h>

#include <unistd.h>

#include <sys/stat.h>

#include <sys/time.h>

#include "common.h"

#include "makefs.h"

#include "mtree.h"

static  void     apply_specdir(const char *, NODE *, fsnode *, int);

static  void     apply_specentry(const char *, NODE *, fsnode *);

static  fsnode  *create_fsnode(const char *, const char *, const char *,

                               struct stat *);

static  fsinode *link_check(fsinode *);

/*

 * walk_dir --

 *      build a tree of fsnodes from `root' and `dir', with a parent

 *      fsnode of `parent' (which may be NULL for the root of the tree).

 *      append the tree to a fsnode of `join' if it is not NULL.

 *      each "level" is a directory, with the "." entry guaranteed to be

 *      at the start of the list, and without ".." entries.

 */

fsnode *

walk_dir(const char *root, const char *dir, fsnode *parent, fsnode *join)

{

        fsnode          *first, *cur, *prev, *last;

        DIR             *dirp;

        struct dirent   *dent;

        char            path[MAXPATHLEN + 1];

        struct stat     stbuf;

        char            *name, *rp;

        int             dot, len;

        assert(root != NULL);

        assert(dir != NULL);

        len = snprintf(path, sizeof(path), "%s/%s", root, dir);

        if (len >= (int)sizeof(path))

                errx(1, "Pathname too long.");

        if (debug & DEBUG_WALK_DIR)

                printf("walk_dir: %s %p\n", path, parent);

        if ((dirp = opendir(path)) == NULL)

                err(1, "Can't opendir `%s'", path);

        rp = path + strlen(root) + 1;

        if (join != NULL) {

                first = cur = join;

                while (cur->next != NULL)

                        cur = cur->next;

                prev = last = cur;

        } else

                last = first = prev = NULL;

        while ((dent = readdir(dirp)) != NULL) {

                name = dent->d_name;

                dot = 0;

                if (name[0] == '.')

                        switch (name[1]) {

                        case '\0':      /* "." */

                                if (join != NULL)

                                        continue;

                                dot = 1;

                                break;

                        case '.':       /* ".." */

                                if (name[2] == '\0')

                                        continue;

                                /* FALLTHROUGH */

                        default:

                                dot = 0;

                        }

                if (debug & DEBUG_WALK_DIR_NODE)

                        printf("scanning %s/%s/%s\n", root, dir, name);

                if (snprintf(path + len, sizeof(path) - len, "/%s", name) >=

                    (int)sizeof(path) - len)

                        errx(1, "Pathname too long.");

                if (lstat(path, &stbuf) == -1)

                        err(1, "Can't lstat `%s'", path);

#ifdef S_ISSOCK

                if (S_ISSOCK(stbuf.st_mode & S_IFMT)) {

                        if (debug & DEBUG_WALK_DIR_NODE)

                                printf("  skipping socket %s\n", path);

                        continue;

                }

#endif

                if (join != NULL) {

                        cur = join->next;

                        for (;;) {

                                if (cur == NULL || strcmp(cur->name, name) == 0)

                                        break;

                                if (cur == last) {

                                        cur = NULL;

                                        break;

                                }

                                cur = cur->next;

                        }

                        if (cur != NULL) {

                                if (S_ISDIR(cur->type) &&

                                    S_ISDIR(stbuf.st_mode)) {

                                        if (debug & DEBUG_WALK_DIR_NODE)

                                                printf("merging %s with %p\n",

                                                    path, cur->child);

                                        cur->child = walk_dir(root, rp, cur,

                                            cur->child);

                                        continue;

                                }

                                errx(1, "Can't merge %s `%s' with existing %s",

                                    inode_type(stbuf.st_mode), path,

                                    inode_type(cur->type));

                        }

                }

                cur = create_fsnode(root, dir, name, &stbuf);

                cur->parent = parent;

                if (dot) {

                                /* ensure "." is at the start of the list */

                        cur->next = first;

                        first = cur;

                        if (! prev)

                                prev = cur;

                        cur->first = first;

                } else {                        /* not "." */

                        if (prev)

                                prev->next = cur;

                        prev = cur;

                        if (!first)

                                first = cur;

                        cur->first = first;

                        if (S_ISDIR(cur->type)) {

                                cur->child = walk_dir(root, rp, cur, NULL);

                                continue;

                        }

                }

                if (stbuf.st_nlink > 1) {

                        fsinode *curino;

                        curino = link_check(cur->inode);

                        if (curino != NULL) {

                                free(cur->inode);

                                cur->inode = curino;

                                cur->inode->nlink++;

                                if (debug & DEBUG_WALK_DIR_LINKCHECK)

                                        printf("link_check: found [%llu, %llu]\n",

                                            (unsigned long long)curino->st.st_dev,

                                            (unsigned long long)curino->st.st_ino);

                        }

                }

                if (S_ISLNK(cur->type)) {

                        char    slink[PATH_MAX+1];

                        int     llen;

                        llen = readlink(path, slink, sizeof(slink) - 1);

                        if (llen == -1)

                                err(1, "Readlink `%s'", path);

                        slink[llen] = '\0';

                        if ((cur->symlink = strdup(slink)) == NULL)

                                err(1, "Memory allocation error");

                }

        }

        assert(first != NULL);

        if (join == NULL)

                for (cur = first->next; cur != NULL; cur = cur->next)

                        cur->first = first;

        if (closedir(dirp) == -1)

                err(1, "Can't closedir `%s/%s'", root, dir);

        return (first);

}

static fsnode *

create_fsnode(const char *root, const char *path, const char *name,

    struct stat *stbuf)

{

        fsnode *cur;

        if ((cur = calloc(1, sizeof(fsnode))) == NULL ||

            (cur->path = strdup(path)) == NULL ||

            (cur->name = strdup(name)) == NULL ||

            (cur->inode = calloc(1, sizeof(fsinode))) == NULL)

                err(1, "Memory allocation error");

        cur->root = root;

        cur->type = stbuf->st_mode & S_IFMT;

        cur->inode->nlink = 1;

        cur->inode->st = *stbuf;

        return (cur);

}

/*

 * free_fsnodes --

 *      Removes node from tree and frees it and all of

 *   its decendents.

 */

void

free_fsnodes(fsnode *node)

{

        fsnode  *cur, *next;

        assert(node != NULL);

        /* for ".", start with actual parent node */

        if (node->first == node) {

                assert(node->name[0] == '.' && node->name[1] == '\0');

                if (node->parent) {

                        assert(node->parent->child == node);

                        node = node->parent;

                }

        }

        /* Find ourselves in our sibling list and unlink */

        if (node->first != node) {

                for (cur = node->first; cur->next; cur = cur->next) {

                        if (cur->next == node) {

                                cur->next = node->next;

                                node->next = NULL;

                                break;

                        }

                }

        }

        for (cur = node; cur != NULL; cur = next) {

                next = cur->next;

                if (cur->child) {

                        cur->child->parent = NULL;

                        free_fsnodes(cur->child);

                }

                if (cur->inode->nlink-- == 1)

                        free(cur->inode);

                if (cur->symlink)

                        free(cur->symlink);

                free(cur->path);

                free(cur->name);

                free(cur);

        }

}

/*

 * apply_specfile --

 *      read in the mtree(8) specfile, and apply it to the tree

 *      at dir,parent. parameters in parent on equivalent types

 *      will be changed to those found in specfile, and missing

 *      entries will be added.

 */

void

apply_specfile(const char *specfile, const char *dir, fsnode *parent, int speconly)

{

        struct timeval   start;

        FILE    *fp;

        NODE    *root;

        assert(specfile != NULL);

        assert(parent != NULL);

        if (debug & DEBUG_APPLY_SPECFILE)

                printf("apply_specfile: %s, %s %p\n", specfile, dir, parent);

                                /* read in the specfile */

        if ((fp = fopen(specfile, "r")) == NULL)

                err(1, "Can't open `%s'", specfile);

        TIMER_START(start);

        /* !!!!! HG: */

        //root = spec(fp);

        root = NULL;

        /* :HG !!!!! */

        TIMER_RESULTS(start, "spec");

        if (fclose(fp) == EOF)

                err(1, "Can't close `%s'", specfile);

                                /* perform some sanity checks */

        if (root == NULL)

                errx(1, "Specfile `%s' did not contain a tree", specfile);

        assert(strcmp(root->name, ".") == 0);

        assert(root->type == F_DIR);

                                /* merge in the changes */

        apply_specdir(dir, root, parent, speconly);

        /* !!!!! HG: */

        //free_nodes(root);

        /* :HG !!!!! */

}

static void

apply_specdir(const char *dir, NODE *specnode, fsnode *dirnode, int speconly)

{

        char     path[MAXPATHLEN + 1];

        NODE    *curnode;

        fsnode  *curfsnode;

        assert(specnode != NULL);

        assert(dirnode != NULL);

        if (debug & DEBUG_APPLY_SPECFILE)

                printf("apply_specdir: %s %p %p\n", dir, specnode, dirnode);

        if (specnode->type != F_DIR)

                errx(1, "Specfile node `%s/%s' is not a directory",

                    dir, specnode->name);

        if (dirnode->type != S_IFDIR)

                errx(1, "Directory node `%s/%s' is not a directory",

                    dir, dirnode->name);

        apply_specentry(dir, specnode, dirnode);

        /* Remove any filesystem nodes not found in specfile */

        /* XXX inefficient.  This is O^2 in each dir and it would

         * have been better never to have walked this part of the tree

         * to begin with

         */

        if (speconly) {

                fsnode *next;

                assert(dirnode->name[0] == '.' && dirnode->name[1] == '\0');

                for (curfsnode = dirnode->next; curfsnode != NULL; curfsnode = next) {

                        next = curfsnode->next;

                        for (curnode = specnode->child; curnode != NULL;

                             curnode = curnode->next) {

                                if (strcmp(curnode->name, curfsnode->name) == 0)

                                        break;

                        }

                        if (curnode == NULL) {

                                if (debug & DEBUG_APPLY_SPECONLY) {

                                        printf("apply_specdir: trimming %s/%s %p\n", dir, curfsnode->name, curfsnode);

                                }

                                free_fsnodes(curfsnode);

                        }

                }

        }

                        /* now walk specnode->child matching up with dirnode */

        for (curnode = specnode->child; curnode != NULL;

            curnode = curnode->next) {

                if (debug & DEBUG_APPLY_SPECENTRY)

                        printf("apply_specdir:  spec %s\n",

                            curnode->name);

                for (curfsnode = dirnode->next; curfsnode != NULL;

                    curfsnode = curfsnode->next) {

#if 0   /* too verbose for now */

                        if (debug & DEBUG_APPLY_SPECENTRY)

                                printf("apply_specdir:  dirent %s\n",

                                    curfsnode->name);

#endif

                        if (strcmp(curnode->name, curfsnode->name) == 0)

                                break;

                }

                if (snprintf(path, sizeof(path), "%s/%s",

                    dir, curnode->name) >= sizeof(path))

                        errx(1, "Pathname too long.");

                if (curfsnode == NULL) {        /* need new entry */

                        struct stat     stbuf;

                                            /*

                                             * don't add optional spec entries

                                             * that lack an existing fs entry

                                             */

                        if ((curnode->flags & F_OPT) &&

                            lstat(path, &stbuf) == -1)

                                        continue;

                                        /* check that enough info is provided */

#define NODETEST(t, m)                                                  \

                        if (!(t))                                       \

                                errx(1, "`%s': %s not provided", path, m)

                        NODETEST(curnode->flags & F_TYPE, "type");

                        NODETEST(curnode->flags & F_MODE, "mode");

                                /* XXX: require F_TIME ? */

                        NODETEST(curnode->flags & F_GID ||

                            curnode->flags & F_GNAME, "group");

                        NODETEST(curnode->flags & F_UID ||

                            curnode->flags & F_UNAME, "user");

                        if (curnode->type == F_BLOCK || curnode->type == F_CHAR)

                                NODETEST(curnode->flags & F_DEV,

                                    "device number");

#undef NODETEST

                        if (debug & DEBUG_APPLY_SPECFILE)

                                printf("apply_specdir: adding %s\n",

                                    curnode->name);

                                        /* build minimal fsnode */

                        memset(&stbuf, 0, sizeof(stbuf));

                        stbuf.st_mode = nodetoino(curnode->type);

                        stbuf.st_nlink = 1;

                        stbuf.st_mtime = stbuf.st_atime =

                            stbuf.st_ctime = start_time.tv_sec;

#if HAVE_STRUCT_STAT_ST_MTIMENSEC

                        stbuf.st_mtimensec = stbuf.st_atimensec =

                            stbuf.st_ctimensec = start_time.tv_nsec;

#endif

                        curfsnode = create_fsnode(".", ".", curnode->name,

                            &stbuf);

                        curfsnode->parent = dirnode->parent;

                        curfsnode->first = dirnode;

                        curfsnode->next = dirnode->next;

                        dirnode->next = curfsnode;

                        if (curfsnode->type == S_IFDIR) {

                                        /* for dirs, make "." entry as well */

                                curfsnode->child = create_fsnode(".", ".", ".",

                                    &stbuf);

                                curfsnode->child->parent = curfsnode;

                                curfsnode->child->first = curfsnode->child;

                        }

                        if (curfsnode->type == S_IFLNK) {

                                assert(curnode->slink != NULL);

                                        /* for symlinks, copy the target */

                                if ((curfsnode->symlink =

                                    strdup(curnode->slink)) == NULL)

                                        err(1, "Memory allocation error");

                        }

                }

                apply_specentry(dir, curnode, curfsnode);

                if (curnode->type == F_DIR) {

                        if (curfsnode->type != S_IFDIR)

                                errx(1, "`%s' is not a directory", path);

                        assert (curfsnode->child != NULL);

                        apply_specdir(path, curnode, curfsnode->child, speconly);

                }

        }

}

static void

apply_specentry(const char *dir, NODE *specnode, fsnode *dirnode)

{

        assert(specnode != NULL);

        assert(dirnode != NULL);

        if (nodetoino(specnode->type) != dirnode->type)

                errx(1, "`%s/%s' type mismatch: specfile %s, tree %s",

                    dir, specnode->name, inode_type(nodetoino(specnode->type)),

                    inode_type(dirnode->type));

        if (debug & DEBUG_APPLY_SPECENTRY)

                printf("apply_specentry: %s/%s\n", dir, dirnode->name);

#define ASEPRINT(t, b, o, n) \

                if (debug & DEBUG_APPLY_SPECENTRY) \

                        printf("\t\t\tchanging %s from " b " to " b "\n", \

                            t, o, n)

        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);

                if ((dirnode->symlink = strdup(specnode->slink)) == NULL)

                        err(1, "Memory allocation error");

        }

        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 {