freebsd-src/usr.sbin/makefs/walk.c
2008-12-19 18:47:46 +00:00

569 lines
16 KiB
C

/* $NetBSD: walk.c,v 1.17 2004/06/20 22:20:18 jmc 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.
*/
/*
* The function link_check() was inspired from NetBSD's usr.bin/du/du.c,
* which has the following copyright notice:
*
*
* Copyright (c) 1989, 1993, 1994
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Chris Newcomb.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#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 "makefs.h"
#include "mtree.h"
#include "extern.h" /* NB: mtree */
static void apply_specdir(const char *, NODE *, fsnode *);
static void apply_specentry(const char *, NODE *, fsnode *);
static fsnode *create_fsnode(const char *, struct stat *);
static fsinode *link_check(fsinode *);
/*
* walk_dir --
* build a tree of fsnodes from `dir', with a parent fsnode of `parent'
* (which may be NULL for the root of the tree).
* 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 *dir, fsnode *parent)
{
fsnode *first, *cur, *prev;
DIR *dirp;
struct dirent *dent;
char path[MAXPATHLEN + 1];
struct stat stbuf;
assert(dir != NULL);
if (debug & DEBUG_WALK_DIR)
printf("walk_dir: %s %p\n", dir, parent);
if ((dirp = opendir(dir)) == NULL)
err(1, "Can't opendir `%s'", dir);
first = prev = NULL;
while ((dent = readdir(dirp)) != NULL) {
if (strcmp(dent->d_name, "..") == 0)
continue;
if (debug & DEBUG_WALK_DIR_NODE)
printf("scanning %s/%s\n", dir, dent->d_name);
if (snprintf(path, sizeof(path), "%s/%s", dir, dent->d_name)
>= sizeof(path))
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
cur = create_fsnode(dent->d_name, &stbuf);
cur->parent = parent;
if (strcmp(dent->d_name, ".") == 0) {
/* ensure "." is at the start of the list */
cur->next = first;
first = cur;
if (! prev)
prev = cur;
} else { /* not "." */
if (prev)
prev->next = cur;
prev = cur;
if (!first)
first = cur;
if (S_ISDIR(cur->type)) {
cur->child = walk_dir(path, cur);
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 (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");
}
}
for (cur = first; cur != NULL; cur = cur->next)
cur->first = first;
if (closedir(dirp) == -1)
err(1, "Can't closedir `%s'", dir);
return (first);
}
static fsnode *
create_fsnode(const char *name, struct stat *stbuf)
{
fsnode *cur;
if ((cur = calloc(1, sizeof(fsnode))) == NULL ||
(cur->name = strdup(name)) == NULL ||
(cur->inode = calloc(1, sizeof(fsinode))) == NULL)
err(1, "Memory allocation error");
cur->type = stbuf->st_mode & S_IFMT;
cur->inode->nlink = 1;
cur->inode->st = *stbuf;
return (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)
{
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);
root = mtree_readspec(fp);
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);
}
static u_int
nodetoino(u_int type)
{
switch (type) {
case F_BLOCK:
return S_IFBLK;
case F_CHAR:
return S_IFCHR;
case F_DIR:
return S_IFDIR;
case F_FIFO:
return S_IFIFO;
case F_FILE:
return S_IFREG;
case F_LINK:
return S_IFLNK;
case F_SOCK:
return S_IFSOCK;
default:
printf("unknown type %d", type);
abort();
}
/* NOTREACHED */
}
static void
apply_specdir(const char *dir, NODE *specnode, fsnode *dirnode)
{
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);
/* 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");
#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);
}
}
}
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
#undef ASEPRINT
dirnode->flags |= FSNODE_F_HASSPEC;
}
/*
* dump_fsnodes --
* dump the fsnodes from `cur', based in the directory `dir'
*/
void
dump_fsnodes(const char *dir, fsnode *root)
{
fsnode *cur;
char path[MAXPATHLEN + 1];
assert (dir != NULL);
printf("dump_fsnodes: %s %p\n", dir, root);
for (cur = root; cur != NULL; cur = cur->next) {
if (snprintf(path, sizeof(path), "%s/%s", dir, cur->name)
>= 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(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);
}