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mc/vfs/extfs.c

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/* Virtual File System: External file system.
Copyright (C) 1995 The Free Software Foundation
Written by: 1995 Jakub Jelinek
Rewritten by: 1998 Pavel Machek
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
#include <config.h>
#include <stdio.h>
#include <ctype.h>
#include <string.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <signal.h>
#ifdef HAVE_SYS_WAIT_H
#include <sys/wait.h>
#endif
#include <errno.h>
#ifdef SCO_FLAVOR
#include <sys/timeb.h> /* alex: for struct timeb definition */
#endif /* SCO_FLAVOR */
#include <time.h>
#include "../src/fs.h"
#include "../src/util.h"
#include "../src/dialog.h"
#include "../src/mem.h"
#include "../src/mad.h"
#include "../src/main.h" /* For shell_execute */
#define WANT_PARSE_LS_LGA
#include "vfs.h"
#include "extfs.h"
static struct extfs_entry *
extfs_find_entry (struct extfs_entry *dir, char *name, int make_dirs, int make_file);
static struct extfs_archive *first_archive = NULL;
static int extfserrno = 0;
static struct stat hstat; /* Stat struct corresponding */
static char *current_file_name, *current_link_name;
static char *extfs_current_dir;
#define MAXEXTFS 32
static char *extfs_prefixes [MAXEXTFS];
static char extfs_need_archive [MAXEXTFS];
static int extfs_no = 0;
void extfs_fill_names (void (*func)(char *))
{
struct extfs_archive *a = first_archive;
char *name;
while (a){
name = copy_strings (extfs_prefixes [a->fstype], "#",
(a->name ? a->name : ""), "/",
a->current_dir->name, 0);
(*func)(name);
free (name);
a = a->next;
}
}
static void make_dot_doubledot (struct extfs_entry *ent)
{
struct extfs_entry *entry = (struct extfs_entry *)
xmalloc (sizeof (struct extfs_entry), "Extfs: extfs_entry");
struct extfs_entry *parentry = ent->dir;
struct extfs_inode *inode = ent->inode, *parent;
parent = (parentry != NULL) ? parentry->inode : NULL;
entry->name = strdup (".");
entry->has_changed = 0;
entry->inode = inode;
entry->dir = ent;
inode->local_filename = NULL;
inode->first_in_subdir = entry;
inode->last_in_subdir = entry;
inode->nlink++;
entry->next_in_dir = (struct extfs_entry *)
xmalloc (sizeof (struct extfs_entry), "Extfs: extfs_entry");
entry=entry->next_in_dir;
entry->name = strdup ("..");
entry->has_changed = 0;
inode->last_in_subdir = entry;
entry->next_in_dir = NULL;
if (parent != NULL) {
entry->inode = parent;
entry->dir = parentry;
parent->nlink++;
} else {
entry->inode = inode;
entry->dir = ent;
inode->nlink++;
}
}
static struct extfs_entry *generate_entry (struct extfs_archive *archive,
char *name, struct extfs_entry *parentry, mode_t mode)
{
mode_t myumask;
struct extfs_inode *inode, *parent;
struct extfs_entry *entry;
parent = (parentry != NULL) ? parentry->inode : NULL;
entry = (struct extfs_entry *)
xmalloc (sizeof (struct extfs_entry), "Extfs: extfs_entry");
entry->name = strdup (name);
entry->has_changed = 0;
entry->next_in_dir = NULL;
entry->dir = parentry;
if (parent != NULL) {
parent->last_in_subdir->next_in_dir = entry;
parent->last_in_subdir = entry;
}
inode = (struct extfs_inode *)
xmalloc (sizeof (struct extfs_inode), "Extfs: extfs_inode");
entry->inode = inode;
inode->has_changed = 0;
inode->local_filename = NULL;
inode->linkname = 0;
inode->inode = (archive->__inode_counter)++;
inode->dev = archive->rdev;
inode->archive = archive;
myumask = umask (022);
umask (myumask);
inode->mode = mode & ~myumask;
mode = inode->mode;
inode->rdev = 0;
inode->uid = getuid ();
inode->gid = getgid ();
inode->size = 0;
inode->mtime = time (NULL);
inode->atime = inode->mtime;
inode->ctime = inode->mtime;
inode->nlink = 1;
if (S_ISDIR (mode))
make_dot_doubledot (entry);
return entry;
}
static void free_entries (struct extfs_entry *entry)
{
return;
}
static void free_archive (struct extfs_archive *archive)
{
free_entries (archive->root_entry);
if (archive->local_name != NULL) {
struct stat my;
mc_stat (archive->local_name, &my);
mc_ungetlocalcopy (archive->name, archive->local_name,
archive->local_stat.st_mtime != my.st_mtime);
/* ungetlocalcopy frees local_name for us */
}
if (archive->name)
free (archive->name);
free (archive);
}
static FILE *open_extfs_archive (int fstype, char *name, struct extfs_archive **pparc)
{
static dev_t __extfs_no = 0;
FILE *result;
mode_t mode;
char *cmd;
char *mc_extfsdir;
struct stat mystat;
struct extfs_archive *current_archive;
struct extfs_entry *root_entry;
char *local_name = NULL, *tmp = 0;
int uses_archive = extfs_need_archive [fstype];
char *tmpfile;
if (uses_archive){
if (mc_stat (name, &mystat) == -1)
return NULL;
if (!vfs_file_is_local (name)) {
local_name = mc_getlocalcopy (name);
if (local_name == NULL)
return NULL;
}
tmp = name_quote (name, 0);
}
#if 0
/* Sorry, what is this good for? */
if (uses_archive == EFS_NEED_ARG){
tmp = name_quote (name, 0);
}
#endif
mc_extfsdir = concat_dir_and_file (mc_home, "extfs/");
cmd = copy_strings (mc_extfsdir, extfs_prefixes [fstype],
" list ", local_name ? local_name : tmp, 0);
if (tmp)
free (tmp);
result = popen (cmd, "r");
free (cmd);
free (mc_extfsdir);
if (result == NULL) {
if (local_name != NULL && uses_archive)
mc_ungetlocalcopy (name, local_name, 0);
return NULL;
}
current_archive = (struct extfs_archive *)
xmalloc (sizeof (struct extfs_archive), "Extfs archive");
current_archive->fstype = fstype;
current_archive->name = name ? strdup (name): name;
current_archive->local_name = local_name;
if (local_name != NULL)
mc_stat (local_name, &current_archive->local_stat);
current_archive->__inode_counter = 0;
current_archive->fd_usage = 0;
current_archive->extfsstat = mystat;
current_archive->rdev = __extfs_no++;
current_archive->next = first_archive;
first_archive = current_archive;
mode = current_archive->extfsstat.st_mode & 07777;
if (mode & 0400)
mode |= 0100;
if (mode & 0040)
mode |= 0010;
if (mode & 0004)
mode |= 0001;
mode |= S_IFDIR;
root_entry = generate_entry (current_archive, "/", NULL, mode);
root_entry->inode->uid = current_archive->extfsstat.st_uid;
root_entry->inode->gid = current_archive->extfsstat.st_gid;
root_entry->inode->atime = current_archive->extfsstat.st_atime;
root_entry->inode->ctime = current_archive->extfsstat.st_ctime;
root_entry->inode->mtime = current_archive->extfsstat.st_mtime;
current_archive->root_entry = root_entry;
current_archive->current_dir = root_entry;
*pparc = current_archive;
return result;
}
/*
* Main loop for reading an archive.
* Returns 0 on success, -1 on error.
*/
int read_extfs_archive (int fstype, char *name, struct extfs_archive **pparc)
{
FILE *extfsd;
char *buffer;
struct extfs_archive *current_archive;
if ((extfsd = open_extfs_archive (fstype, name, &current_archive)) == NULL) {
message_3s (1, MSG_ERROR, _("Couldn't open %s archive\n%s"),
extfs_prefixes [fstype], name);
return -1;
}
buffer = xmalloc (4096, "Extfs: buffer");
while (fgets (buffer, 4096, extfsd) != NULL) {
current_link_name = NULL;
if (parse_ls_lga (buffer, &hstat, &current_file_name, &current_link_name)) {
struct extfs_entry *entry, *pent;
struct extfs_inode *inode;
char *p, *q, *cfn = current_file_name;
if (*cfn) {
if (*cfn == '/')
cfn++;
p = strchr (cfn, 0);
if (p != NULL && p != cfn && *(p - 1) == '/')
*(p - 1) = 0;
p = strrchr (cfn, '/');
if (p == NULL) {
p = cfn;
q = strchr (cfn, 0);
} else {
*(p++) = 0;
q = cfn;
}
if (S_ISDIR (hstat.st_mode) &&
(!strcmp (p, ".") || !strcmp (p, "..")))
goto read_extfs_continue;
pent = extfs_find_entry (current_archive->root_entry, q, 1, 0) ;
if (pent == NULL) {
message_1s (1, MSG_ERROR, _("Inconsistent extfs archive"));
/* FIXME: Should clean everything one day */
free (buffer);
pclose (extfsd);
return -1;
}
entry = (struct extfs_entry *) xmalloc (sizeof (struct extfs_entry), "Extfs: extfs_entry");
entry->name = strdup (p);
entry->has_changed = 0;
entry->next_in_dir = NULL;
entry->dir = pent;
if (pent != NULL) {
if (pent->inode->last_in_subdir){
pent->inode->last_in_subdir->next_in_dir = entry;
pent->inode->last_in_subdir = entry;
}
}
if (!S_ISLNK (hstat.st_mode) && current_link_name != NULL) {
pent = extfs_find_entry (current_archive->root_entry, current_link_name, 0, 0);
if (pent == NULL) {
message_1s (1, MSG_ERROR, _("Inconsistent extfs archive"));
/* FIXME: Should clean everything one day */
free (buffer);
pclose (extfsd);
return -1;
} else {
entry->inode = pent->inode;
pent->inode->nlink++;
}
} else {
inode = (struct extfs_inode *) xmalloc (sizeof (struct extfs_inode), "Extfs: extfs_inode");
entry->inode = inode;
inode->local_filename = NULL;
inode->has_changed = 0;
inode->inode = (current_archive->__inode_counter)++;
inode->nlink = 1;
inode->dev = current_archive->rdev;
inode->archive = current_archive;
inode->mode = hstat.st_mode;
#ifdef HAVE_ST_RDEV
inode->rdev = hstat.st_rdev;
#else
inode->rdev = 0;
#endif
inode->uid = hstat.st_uid;
inode->gid = hstat.st_gid;
inode->size = hstat.st_size;
inode->mtime = hstat.st_mtime;
inode->atime = hstat.st_atime;
inode->ctime = hstat.st_ctime;
if (current_link_name != NULL && S_ISLNK (hstat.st_mode)) {
inode->linkname = current_link_name;
current_link_name = NULL;
} else {
if (S_ISLNK( hstat.st_mode))
inode->mode &= ~S_IFLNK; /* You *DON'T* want to do this always */
inode->linkname = NULL;
}
if (S_ISDIR (hstat.st_mode))
make_dot_doubledot (entry);
}
}
read_extfs_continue:
free (current_file_name);
if (current_link_name != NULL)
free (current_link_name);
}
}
pclose (extfsd);
#ifdef SCO_FLAVOR
waitpid(-1,NULL,WNOHANG);
#endif /* SCO_FLAVOR */
*pparc = current_archive;
free (buffer);
return 0;
}
static char *extfs_get_path (char *inname, struct extfs_archive **archive, int is_dir,
int do_not_open);
/* Returns path inside argument. Returned char* is inside inname, which is mangled
* by this operation (so you must not free it's return value)
*/
static char *extfs_get_path_mangle (char *inname, struct extfs_archive **archive, int is_dir,
int do_not_open)
{
char *local, *archive_name, *op;
int result = -1;
struct extfs_archive *parc;
struct vfs_stamping *parent;
vfs *v;
int fstype;
archive_name = inname;
vfs_split( inname, &local, &op );
fstype = extfs_which( op );
if (!local)
local = "";
if (fstype == -1)
return NULL;
/* All filesystems should have some local archive, at least
* it can be '/'.
*
* Actually, we should implement an alias mechanism that would
* translate: "a:" to "dos:a.
*
*/
for (parc = first_archive; parc != NULL; parc = parc->next)
if (parc->name) {
if (!strcmp (parc->name, archive_name)) {
struct stat *s=&(parc->extfsstat);
if (vfs_uid && (!(s->st_mode & 0004)))
if ((s->st_gid != vfs_gid) || !(s->st_mode & 0040))
if ((s->st_uid != vfs_uid) || !(s->st_mode & 0400))
return NULL;
/* This is not too secure - in some cases (/#mtools) files created
under user a are probably visible to everyone else since / usually
has permissions 755 */
vfs_stamp (&extfs_vfs_ops, (vfsid) parc);
goto return_success;
}
}
result = do_not_open ? -1 : read_extfs_archive (fstype, archive_name, &parc);
if (result == -1) {
extfserrno = EIO;
return NULL;
}
if (archive_name){
v = vfs_type (archive_name);
if (v == &local_vfs_ops) {
parent = NULL;
} else {
parent = xmalloc (sizeof (struct vfs_stamping), "vfs stamping");
parent->v = v;
parent->next = 0;
parent->id = (*v->getid) (archive_name, &(parent->parent));
}
vfs_add_noncurrent_stamps (&extfs_vfs_ops, (vfsid) parc, parent);
vfs_rm_parents (parent);
}
return_success:
*archive = parc;
return local;
}
/* Returns allocated path (without leading slash) inside the archive */
static char *extfs_get_path_from_entry (struct extfs_entry *entry)
{
struct list {
struct list *next;
char *name;
} *head, *p;
char *localpath;
size_t len;
for (len = 0, head = 0; entry->dir; entry = entry->dir) {
p = xmalloc (sizeof (struct list), "Extfs: list");
p->next = head;
p->name = entry->name;
head = p;
len += strlen (entry->name) + 1;
}
localpath = xmalloc (len, "Extfs: localpath");
*localpath = '\0';
for ( ; head; ) {
strcat (localpath, head->name);
if (head->next)
strcat (localpath, "/");
p = head;
head = head->next;
free (p);
}
return (localpath);
}
struct extfs_loop_protect {
struct extfs_entry *entry;
struct extfs_loop_protect *next;
};
static int errloop;
static int notadir;
static struct extfs_entry *
__extfs_find_entry (struct extfs_entry *dir, char *name,
struct extfs_loop_protect *list, int make_dirs, int make_file);
static struct extfs_entry *
__extfs_resolve_symlinks (struct extfs_entry *entry,
struct extfs_loop_protect *list)
{
struct extfs_entry *pent;
struct extfs_loop_protect *looping;
if (!S_ISLNK (entry->inode->mode))
return entry;
for (looping = list; looping != NULL; looping = looping->next)
if (entry == looping->entry) { /* Here we protect us against symlink looping */
errloop = 1;
return NULL;
}
looping = (struct extfs_loop_protect *)
xmalloc (sizeof (struct extfs_loop_protect),
"Extfs: symlink looping protection");
looping->entry = entry;
looping->next = list;
pent = __extfs_find_entry (entry->dir, entry->inode->linkname, looping, 0, 0);
free (looping);
if (pent == NULL)
extfserrno = ENOENT;
return pent;
}
static struct extfs_entry *extfs_resolve_symlinks (struct extfs_entry *entry)
{
struct extfs_entry *res;
errloop = 0;
notadir = 0;
res = __extfs_resolve_symlinks (entry, NULL);
if (res == NULL) {
if (errloop)
extfserrno = ELOOP;
else if (notadir)
extfserrno = ENOTDIR;
}
return res;
}
struct extfs_pseudofile {
struct extfs_archive *archive;
unsigned int has_changed:1;
int local_handle;
struct extfs_entry *entry;
};
static char *get_archive_name (struct extfs_archive *archive)
{
char *archive_name;
if (archive->local_name)
archive_name = archive->local_name;
else
archive_name = archive->name;
if (!archive_name || !*archive_name)
return "no_archive_name";
else
return archive_name;
}
void extfs_run (char *file)
{
struct extfs_archive *archive;
char *p, *q, *cmd, *archive_name, *mc_extfsdir;
if ((p = extfs_get_path (file, &archive, 0, 0)) == NULL)
return;
q = name_quote (p, 0);
archive_name = name_quote (get_archive_name(archive), 0);
mc_extfsdir = concat_dir_and_file (mc_home, "extfs/");
cmd = copy_strings (mc_extfsdir, extfs_prefixes [archive->fstype],
" run ", archive_name, " ", q, 0);
free (mc_extfsdir);
free (archive_name);
free (q);
#ifndef VFS_STANDALONE
shell_execute(cmd, 0);
#else
vfs_die( "shell_execute: implement me!" );
#endif
free(cmd);
free(p);
}
static void *extfs_open (char *file, int flags, int mode)
{
struct extfs_pseudofile *extfs_info;
struct extfs_archive *archive;
char *q;
struct extfs_entry *entry;
int local_handle;
const int do_create = (flags & O_ACCMODE) != O_RDONLY;
if ((q = extfs_get_path_mangle (file, &archive, 0, 0)) == NULL)
return NULL;
entry = extfs_find_entry (archive->root_entry, q, 0, do_create);
if (entry == NULL)
return NULL;
if ((entry = extfs_resolve_symlinks (entry)) == NULL)
return NULL;
if (S_ISDIR (entry->inode->mode)) {
extfserrno = EISDIR;
return NULL;
}
if (entry->inode->local_filename == NULL) {
char *cmd, *archive_name, *p;
entry->inode->local_filename = strdup (tempnam (NULL, "extfs"));
p = extfs_get_path_from_entry (entry);
q = name_quote (p, 0);
free (p);
archive_name = name_quote (get_archive_name (archive), 0);
mc_extfsdir = concat_dir_and_file (mc_home, "extfs/");
cmd = copy_strings (mc_extfsdir, extfs_prefixes [archive->fstype],
" copyout ",
archive_name,
" ", q, " ", entry->inode->local_filename, 0);
free (q);
free (archive_name);
if (my_system (EXECUTE_AS_SHELL | EXECUTE_SETUID, shell, cmd) && !do_create){
free (entry->inode->local_filename);
entry->inode->local_filename = NULL;
free (cmd);
free (mc_extfsdir);
extfserrno = EIO;
return NULL;
}
free (cmd);
free (mc_extfsdir);
}
local_handle = open (entry->inode->local_filename, flags, mode);
if (local_handle == -1) {
extfserrno = EIO;
return NULL;
}
extfs_info = (struct extfs_pseudofile *) xmalloc (sizeof (struct extfs_pseudofile), "Extfs: extfs_open");
extfs_info->archive = archive;
extfs_info->entry = entry;
extfs_info->has_changed = 0;
extfs_info->local_handle = local_handle;
/* i.e. we had no open files and now we have one */
vfs_rmstamp (&extfs_vfs_ops, (vfsid) archive, 1);
archive->fd_usage++;
return extfs_info;
}
static int extfs_read (void *data, char *buffer, int count)
{
struct extfs_pseudofile *file = (struct extfs_pseudofile *)data;
return read (file->local_handle, buffer, count);
}
static int extfs_close (void *data)
{
struct extfs_pseudofile *file;
int errno_code = 0;
file = (struct extfs_pseudofile *)data;
close (file->local_handle);
/* Commit the file if it has changed */
if (file->has_changed){
struct extfs_archive *archive;
char *archive_name, *file_name;
char *cmd;
char *mc_extfsdir;
char *p;
archive = file->archive;
archive_name = name_quote (get_archive_name (archive), 0);
p = extfs_get_path_from_entry (file->entry);
file_name = name_quote (p, 0);
free (p);
mc_extfsdir = concat_dir_and_file (mc_home, "extfs/");
cmd = copy_strings (mc_extfsdir,
extfs_prefixes [archive->fstype],
" copyin ", archive_name, " ",
file_name, " ",
file->entry->inode->local_filename, 0);
free (archive_name);
free (file_name);
if (my_system (EXECUTE_AS_SHELL | EXECUTE_SETUID, shell, cmd))
errno_code = EIO;
free (cmd);
free (mc_extfsdir);
{
struct stat file_status;
if( stat(file->entry->inode->local_filename,&file_status) != 0 )
errno_code = EIO;
else file->entry->inode->size = file_status.st_size;
}
file->entry->inode->mtime = time (NULL);
}
file->archive->fd_usage--;
if (!file->archive->fd_usage) {
struct vfs_stamping *parent;
vfs *v;
if (!file->archive->name || !*file->archive->name || (v = vfs_type (file->archive->name)) == &local_vfs_ops) {
parent = NULL;
} else {
parent = xmalloc (sizeof (struct vfs_stamping), "vfs stamping");
parent->v = v;
parent->next = 0;
parent->id = (*v->getid) (file->archive->name, &(parent->parent));
}
vfs_add_noncurrent_stamps (&extfs_vfs_ops, (vfsid) (file->archive), parent);
vfs_rm_parents (parent);
}
free (data);
if (errno_code){
extfserrno = EIO; /* Non standard, but who cares? */
return -1;
} else
return 0;
}
#define RECORDSIZE 512
#define X_pseudofile extfs_pseudofile
#define Xerrno extfserrno
#define X_entry extfs_entry
#define X_archive extfs_archive
#define X_get_path extfs_get_path
#define X_get_path_mangle extfs_get_path_mangle
#define X_find_entry extfs_find_entry
#define X_resolve_symlinks extfs_resolve_symlinks
#define X_inode extfs_inode
#define __X_find_entry __extfs_find_entry
#define __X_resolve_symlinks __extfs_resolve_symlinks
#define X_loop_protect extfs_loop_protect
#include "shared.c"
static int extfs_chmod (char *path, int mode)
{
return 0;
}
static int extfs_chown (char *path, int owner, int group)
{
return -1;
}
static int extfs_unlink (char *path)
{
return -1;
}
static int extfs_symlink (char *n1, char *n2)
{
return -1;
}
static int extfs_write (void *data, char *buf, int nbyte)
{
struct extfs_pseudofile *file = (struct extfs_pseudofile *)data;
file->has_changed = 1;
return write (file->local_handle, buf, nbyte);
}
static int extfs_rename (char *a, char *b)
{
return -1;
}
static int extfs_chdir (char *path)
{
struct extfs_archive *archive;
char *q, *res;
struct extfs_entry *entry;
extfserrno = ENOTDIR;
if ((q = extfs_get_path_mangle (path, &archive, 1, 0)) == NULL)
return -1;
entry = extfs_find_entry (archive->root_entry, q, 0, 0);
if (!entry)
return -1;
entry = extfs_resolve_symlinks (entry);
if ((!entry) || (!S_ISDIR (entry->inode->mode)))
return -1;
entry->inode->archive->current_dir = entry;
res = copy_strings (
entry->inode->archive->name, "#", extfs_prefixes [entry->inode->archive->fstype],
"/", q, NULL);
extfserrno = 0;
if (extfs_current_dir)
free (extfs_current_dir);
extfs_current_dir = res;
return 0;
}
static int extfs_lseek (void *data, off_t offset, int whence)
{
struct extfs_pseudofile *file = (struct extfs_pseudofile *) data;
return lseek (file->local_handle, offset, whence);
}
static int extfs_mknod (char *path, int mode, int dev)
{
return -1;
}
static int extfs_link (char *p1, char *p2)
{
return -1;
}
static int extfs_mkdir (char *path, mode_t mode)
{
return -1;
}
static int extfs_rmdir (char *path)
{
return -1;
}
static vfsid extfs_getid (char *path, struct vfs_stamping **parent)
{
struct extfs_archive *archive;
vfs *v;
vfsid id;
struct vfs_stamping *par;
char *p;
*parent = NULL;
if (!(p = extfs_get_path (path, &archive, 1, 1)))
return (vfsid) -1;
free(p);
if (archive->name){
v = vfs_type (archive->name);
id = (*v->getid) (archive->name, &par);
if (id != (vfsid)-1) {
*parent = xmalloc (sizeof (struct vfs_stamping), "vfs stamping");
(*parent)->v = v;
(*parent)->id = id;
(*parent)->parent = par;
(*parent)->next = NULL;
}
}
return (vfsid) archive;
}
static int extfs_nothingisopen (vfsid id)
{
if (((struct extfs_archive *)id)->fd_usage <= 0)
return 1;
else
return 0;
}
static void free_entry (struct extfs_entry *e)
{
int i = --(e->inode->nlink);
if (S_ISDIR (e->inode->mode) && e->inode->first_in_subdir != NULL) {
struct extfs_entry *f = e->inode->first_in_subdir;
e->inode->first_in_subdir = NULL;
free_entry (f);
}
if (i <= 0) {
if (e->inode->local_filename != NULL) {
unlink (e->inode->local_filename);
free (e->inode->local_filename);
}
if (e->inode->linkname != NULL)
free (e->inode->linkname);
free (e->inode);
}
if (e->next_in_dir != NULL)
free_entry (e->next_in_dir);
free (e->name);
free (e);
}
static void extfs_free (vfsid id)
{
struct extfs_archive *parc;
struct extfs_archive *archive = (struct extfs_archive *)id;
free_entry (archive->root_entry);
if (archive == first_archive) {
first_archive = archive->next;
} else {
for (parc = first_archive; parc != NULL; parc = parc->next)
if (parc->next == archive)
break;
if (parc != NULL)
parc->next = archive->next;
}
free_archive (archive);
}
static char *extfs_getlocalcopy (char *path)
{
struct extfs_pseudofile *fp =
(struct extfs_pseudofile *) extfs_open (path, O_RDONLY, 0);
char *p;
if (fp == NULL)
return NULL;
if (fp->entry->inode->local_filename == NULL) {
extfs_close ((void *) fp);
return NULL;
}
p = strdup (fp->entry->inode->local_filename);
fp->archive->fd_usage++;
extfs_close ((void *) fp);
return p;
}
static void extfs_ungetlocalcopy (char *path, char *local, int has_changed)
{
struct extfs_pseudofile *fp =
(struct extfs_pseudofile *) extfs_open (path, O_WRONLY, 0);
if (fp == NULL)
return;
if (!strcmp (fp->entry->inode->local_filename, local)) {
fp->entry->inode->has_changed = has_changed;
fp->archive->fd_usage--;
extfs_close ((void *) fp);
return;
} else {
/* Should not happen */
extfs_close ((void *) fp);
mc_def_ungetlocalcopy (path, local, has_changed);
}
}
#ifdef HAVE_MMAP
caddr_t extfs_mmap (caddr_t addr, size_t len, int prot, int flags, void *data, off_t offset)
{
return (caddr_t)-1;
}
int extfs_munmap (caddr_t addr, size_t len, void *data)
{
return -1;
}
#endif
vfs extfs_vfs_ops =
{
extfs_open,
extfs_close,
extfs_read,
extfs_write,
s_opendir,
s_readdir,
s_closedir,
s_telldir,
s_seekdir,
s_stat,
s_lstat,
s_fstat,
extfs_chmod, /* unimplemented */
extfs_chown, /* unimplemented */
NULL,
s_readlink,
extfs_symlink, /* unimplemented */
extfs_link, /* unimplemented */
extfs_unlink, /* unimplemented */
extfs_rename, /* unimplemented */
extfs_chdir,
s_errno,
extfs_lseek,
extfs_mknod, /* unimplemented */
extfs_getid,
extfs_nothingisopen,
extfs_free,
extfs_getlocalcopy,
extfs_ungetlocalcopy,
extfs_mkdir, /* unimplemented */
extfs_rmdir, /* unimplemented */
NULL,
NULL,
NULL
#ifdef HAVE_MMAP
, extfs_mmap,
extfs_munmap
#endif
};
#include "../src/profile.h"
void extfs_init (void)
{
FILE *cfg;
char *mc_extfsini;
mc_extfsini = concat_dir_and_file (mc_home, "extfs/extfs.ini");
cfg = fopen (mc_extfsini, "r");
free (mc_extfsini);
if (!cfg) {
fprintf( stderr, "Warning: " LIBDIR "extfs/extfs.ini not found\n" );
return;
}
extfs_no = 0;
while ( extfs_no < MAXEXTFS ) {
char key[256];
char *c;
if (!fgets( key, 250, cfg ))
break;
/* Handle those with a trailing ':', those flag that the
* file system does not require an archive to work
*/
if (*key == '[') {
/* We may not use vfs_die() message or message_1s or similar,
* UI is not initialized at this time and message would not
* appear on screen. */
fprintf( stderr, "Warning: You need to update your " LIBDIR "extfs/extfs.ini file.\n" );
fclose(cfg);
return;
}
if (*key == '#')
continue;
if ((c = strchr( key, '\n')))
*c = 0;
c = &key [strlen (key)-1];
extfs_need_archive [extfs_no] = !(*c==':');
if (*c==':') *c = 0;
if (!(*key))
continue;
extfs_prefixes [extfs_no] = strdup (key);
extfs_no++;
}
fclose(cfg);
}
int extfs_which (char *path)
{
int i;
for (i = 0; i < extfs_no; i++)
if (!strcmp (path, extfs_prefixes [i]))
return i;
return -1;
}
char *extfs_get_prefix (int idx)
{
return extfs_prefixes [idx];
}
void extfs_done (void)
{
int i;
for (i = 0; i < extfs_no; i++ )
free (extfs_prefixes [i]);
extfs_no = 0;
if (extfs_current_dir)
free (extfs_current_dir);
extfs_current_dir = 0;
}
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