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mc/vfs/extfs.c

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/* Virtual File System: External file system.
Copyright (C) 1995, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005,
2006, 2007, 2009 Free Software Foundation, Inc.
Written by: 1995 Jakub Jelinek
Rewritten by: 1998 Pavel Machek
Additional changes by: 1999 Andrew T. Veliath
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU Library 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 Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
/**
* \file
* \brief Source: Virtual File System: External file system
* \author Jakub Jelinek
* \author Pavel Machek
* \author Andrew T. Veliath
* \date 1995, 1998, 1999
*/
/* Namespace: init_extfs */
#include <config.h>
#include <stdio.h>
#include <ctype.h>
#include <string.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <signal.h>
#include <fcntl.h>
#include <errno.h>
#include <sys/wait.h>
#include "../src/global.h"
#include "../src/wtools.h" /* message() */
#include "../src/main.h" /* print_vfs_message */
#include "../src/execute.h" /* For shell_execute */
#include "utilvfs.h"
#include "vfs.h"
#include "vfs-impl.h"
#include "gc.h" /* vfs_rmstamp */
#undef ERRNOR
#define ERRNOR(x,y) do { my_errno = x; return y; } while(0)
struct inode {
nlink_t nlink;
struct entry *first_in_subdir; /* only used if this is a directory */
struct entry *last_in_subdir;
ino_t inode; /* This is inode # */
dev_t dev; /* This is an internal identification of the extfs archive */
struct archive *archive; /* And this is an archive structure */
dev_t rdev;
mode_t mode;
uid_t uid;
gid_t gid;
off_t size;
time_t mtime;
char *linkname;
time_t atime;
time_t ctime;
char *local_filename;
};
struct entry {
struct entry *next_in_dir;
struct entry *dir;
char *name;
struct inode *inode;
};
struct pseudofile {
struct archive *archive;
unsigned int has_changed:1;
int local_handle;
struct entry *entry;
};
struct archive {
int fstype;
char *name;
char *local_name;
struct stat local_stat;
dev_t rdev;
int fd_usage;
ino_t inode_counter;
struct entry *root_entry;
struct archive *next;
};
static struct entry *extfs_find_entry (struct entry *dir, char *name,
int make_dirs, int make_file);
static int extfs_which (struct vfs_class *me, const char *path);
static void extfs_remove_entry (struct entry *e);
static void extfs_free (vfsid id);
static void extfs_free_entry (struct entry *e);
static struct vfs_class vfs_extfs_ops;
static struct archive *first_archive = NULL;
static int my_errno = 0;
#define MAXEXTFS 32
static char *extfs_prefixes [MAXEXTFS];
static char extfs_need_archive [MAXEXTFS];
static int extfs_no = 0;
static void
extfs_fill_names (struct vfs_class *me, fill_names_f func)
{
struct archive *a = first_archive;
char *name;
(void) me;
while (a) {
name =
g_strconcat (a->name ? a->name : "", "#",
extfs_prefixes[a->fstype], (char *) NULL);
(*func) (name);
g_free (name);
a = a->next;
}
}
static void extfs_make_dots (struct entry *ent)
{
struct entry *entry = g_new (struct entry, 1);
struct entry *parentry = ent->dir;
struct inode *inode = ent->inode, *parent;
parent = (parentry != NULL) ? parentry->inode : NULL;
entry->name = g_strdup (".");
entry->inode = inode;
entry->dir = ent;
inode->local_filename = NULL;
inode->first_in_subdir = entry;
inode->nlink++;
entry->next_in_dir = g_new (struct entry, 1);
entry = entry->next_in_dir;
entry->name = g_strdup ("..");
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 entry *extfs_generate_entry (struct archive *archive,
const char *name, struct entry *parentry, mode_t mode)
{
mode_t myumask;
struct inode *inode, *parent;
struct entry *entry;
parent = (parentry != NULL) ? parentry->inode : NULL;
entry = g_new (struct entry, 1);
entry->name = g_strdup (name);
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 = g_new (struct inode, 1);
entry->inode = inode;
inode->local_filename = NULL;
inode->linkname = NULL;
inode->last_in_subdir = NULL;
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))
extfs_make_dots (entry);
return entry;
}
#if 0
static void extfs_free_entries (struct entry *entry)
{
(void) entry;
return;
}
#endif
static void extfs_free_archive (struct archive *archive)
{
extfs_free_entry (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);
g_free(archive->local_name);
}
g_free (archive->name);
g_free (archive);
}
static FILE *
extfs_open_archive (int fstype, const char *name, struct archive **pparc)
{
static dev_t archive_counter = 0;
FILE *result;
mode_t mode;
char *cmd;
char *mc_extfsdir;
struct stat mystat;
struct archive *current_archive;
struct entry *root_entry;
char *local_name = NULL, *tmp = 0;
int uses_archive = extfs_need_archive[fstype];
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);
}
mc_extfsdir = concat_dir_and_file (mc_home_alt, "extfs" PATH_SEP_STR);
cmd =
g_strconcat (mc_extfsdir, extfs_prefixes[fstype], " list ",
local_name ? local_name : tmp, (char *) NULL);
g_free (tmp);
g_free (mc_extfsdir);
open_error_pipe ();
result = popen (cmd, "r");
g_free (cmd);
if (result == NULL) {
close_error_pipe (D_ERROR, NULL);
if (local_name) {
mc_ungetlocalcopy (name, local_name, 0);
g_free(local_name);
}
return NULL;
}
#ifdef ___QNXNTO__
setvbuf (result, NULL, _IONBF, 0);
#endif
current_archive = g_new (struct archive, 1);
current_archive->fstype = fstype;
current_archive->name = name ? g_strdup (name) : NULL;
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->rdev = archive_counter++;
current_archive->next = first_archive;
first_archive = current_archive;
mode = mystat.st_mode & 07777;
if (mode & 0400)
mode |= 0100;
if (mode & 0040)
mode |= 0010;
if (mode & 0004)
mode |= 0001;
mode |= S_IFDIR;
root_entry = extfs_generate_entry (current_archive, "/", NULL, mode);
root_entry->inode->uid = mystat.st_uid;
root_entry->inode->gid = mystat.st_gid;
root_entry->inode->atime = mystat.st_atime;
root_entry->inode->ctime = mystat.st_ctime;
root_entry->inode->mtime = mystat.st_mtime;
current_archive->root_entry = root_entry;
*pparc = current_archive;
return result;
}
/*
* Main loop for reading an archive.
* Return 0 on success, -1 on error.
*/
static int
extfs_read_archive (int fstype, const char *name, struct archive **pparc)
{
FILE *extfsd;
char *buffer;
struct archive *current_archive;
char *current_file_name, *current_link_name;
if ((extfsd =
extfs_open_archive (fstype, name, &current_archive)) == NULL) {
message (D_ERROR, MSG_ERROR, _("Cannot open %s archive\n%s"),
extfs_prefixes[fstype], name);
return -1;
}
buffer = g_malloc (4096);
while (fgets (buffer, 4096, extfsd) != NULL) {
struct stat hstat;
current_link_name = NULL;
if (vfs_parse_ls_lga
(buffer, &hstat, &current_file_name, &current_link_name)) {
struct entry *entry, *pent;
struct inode *inode;
char *p, *q, *cfn = current_file_name;
if (*cfn) {
if (*cfn == '/')
cfn++;
p = strchr (cfn, 0);
if (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) {
/* FIXME: Should clean everything one day */
g_free (buffer);
pclose (extfsd);
close_error_pipe (D_ERROR, _("Inconsistent extfs archive"));
return -1;
}
entry = g_new (struct entry, 1);
entry->name = g_strdup (p);
entry->next_in_dir = NULL;
entry->dir = pent;
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) {
/* FIXME: Should clean everything one day */
g_free (buffer);
pclose (extfsd);
close_error_pipe (D_ERROR,
_("Inconsistent extfs archive"));
return -1;
} else {
entry->inode = pent->inode;
pent->inode->nlink++;
}
} else {
inode = g_new (struct inode, 1);
entry->inode = inode;
inode->local_filename = NULL;
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_STRUCT_STAT_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;
inode->first_in_subdir = NULL;
inode->last_in_subdir = NULL;
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))
extfs_make_dots (entry);
}
}
read_extfs_continue:
g_free (current_file_name);
g_free (current_link_name);
}
}
g_free (buffer);
/* Check if extfs 'list' returned 0 */
if (pclose (extfsd) != 0) {
extfs_free (current_archive);
close_error_pipe (D_ERROR, _("Inconsistent extfs archive"));
return -1;
}
close_error_pipe (D_ERROR, NULL);
*pparc = current_archive;
return 0;
}
/*
* Dissect the path and create corresponding superblock. Note that inname
* can be changed and the result may point inside the original string.
*/
static char *
extfs_get_path_mangle (struct vfs_class *me, char *inname, struct archive **archive,
int do_not_open)
{
char *local, *op;
const char *archive_name;
int result = -1;
struct archive *parc;
int fstype;
archive_name = inname;
vfs_split (inname, &local, &op);
fstype = extfs_which (me, op);
if (fstype == -1)
return NULL;
if (!local)
local = inname + strlen (inname);
/*
* All filesystems should have some local archive, at least
* it can be '/'.
*/
for (parc = first_archive; parc != NULL; parc = parc->next)
if (parc->name) {
if (!strcmp (parc->name, archive_name)) {
vfs_stamp (&vfs_extfs_ops, (vfsid) parc);
goto return_success;
}
}
result =
do_not_open ? -1 : extfs_read_archive (fstype, archive_name,
&parc);
if (result == -1)
ERRNOR (EIO, NULL);
return_success:
*archive = parc;
return local;
}
/*
* Dissect the path and create corresponding superblock.
* The result should be freed.
*/
static char *
extfs_get_path (struct vfs_class *me, const char *inname, struct archive **archive,
int do_not_open)
{
char *buf = g_strdup (inname);
char *res = extfs_get_path_mangle (me, buf, archive, do_not_open);
char *res2 = NULL;
if (res)
res2 = g_strdup (res);
g_free (buf);
return res2;
}
/* Return allocated path (without leading slash) inside the archive */
static char *extfs_get_path_from_entry (struct 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 = g_new (struct list, 1);
p->next = head;
p->name = entry->name;
head = p;
len += strlen (entry->name) + 1;
}
if (len == 0)
return g_strdup ("");
localpath = g_malloc (len);
*localpath = '\0';
while (head) {
strcat (localpath, head->name);
if (head->next)
strcat (localpath, "/");
p = head;
head = head->next;
g_free (p);
}
return (localpath);
}
struct loop_protect {
struct entry *entry;
struct loop_protect *next;
};
static int errloop;
static int notadir;
static struct entry *
extfs_find_entry_int (struct entry *dir, char *name,
struct loop_protect *list, int make_dirs, int make_file);
static struct entry *
extfs_resolve_symlinks_int (struct entry *entry,
struct loop_protect *list)
{
struct entry *pent;
struct 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 = g_new (struct loop_protect, 1);
looping->entry = entry;
looping->next = list;
pent = extfs_find_entry_int (entry->dir, entry->inode->linkname, looping, 0, 0);
g_free (looping);
if (pent == NULL)
my_errno = ENOENT;
return pent;
}
static struct entry *extfs_resolve_symlinks (struct entry *entry)
{
struct entry *res;
errloop = 0;
notadir = 0;
res = extfs_resolve_symlinks_int (entry, NULL);
if (res == NULL) {
if (errloop)
my_errno = ELOOP;
else if (notadir)
my_errno = ENOTDIR;
}
return res;
}
static const char *
extfs_get_archive_name (struct archive *archive)
{
const 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;
}
/* Don't pass localname as NULL */
static int
extfs_cmd (const char *extfs_cmd, struct archive *archive,
struct entry *entry, const char *localname)
{
char *file;
char *quoted_file;
char *quoted_localname;
char *archive_name;
char *mc_extfsdir;
char *cmd;
int retval;
file = extfs_get_path_from_entry (entry);
quoted_file = name_quote (file, 0);
g_free (file);
archive_name = name_quote (extfs_get_archive_name (archive), 0);
quoted_localname = name_quote (localname, 0);
mc_extfsdir = concat_dir_and_file (mc_home_alt, "extfs" PATH_SEP_STR);
cmd = g_strconcat (mc_extfsdir, extfs_prefixes[archive->fstype],
extfs_cmd, archive_name, " ", quoted_file, " ",
quoted_localname, (char *) NULL);
g_free (quoted_file);
g_free (quoted_localname);
g_free (mc_extfsdir);
g_free (archive_name);
open_error_pipe ();
retval = my_system (EXECUTE_AS_SHELL, shell, cmd);
g_free (cmd);
close_error_pipe (D_ERROR, NULL);
return retval;
}
static void
extfs_run (struct vfs_class *me, const char *file)
{
struct archive *archive = NULL;
char *p, *q, *archive_name, *mc_extfsdir;
char *cmd;
if ((p = extfs_get_path (me, file, &archive, 0)) == NULL)
return;
q = name_quote (p, 0);
g_free (p);
archive_name = name_quote (extfs_get_archive_name (archive), 0);
mc_extfsdir = concat_dir_and_file (mc_home_alt, "extfs" PATH_SEP_STR);
cmd = g_strconcat (mc_extfsdir, extfs_prefixes[archive->fstype],
" run ", archive_name, " ", q, (char *) NULL);
g_free (mc_extfsdir);
g_free (archive_name);
g_free (q);
shell_execute (cmd, 0);
g_free (cmd);
}
static void *
extfs_open (struct vfs_class *me, const char *file, int flags, int mode)
{
struct pseudofile *extfs_info;
struct archive *archive = NULL;
char *q;
struct entry *entry;
int local_handle;
int created = 0;
if ((q = extfs_get_path (me, file, &archive, 0)) == NULL)
return NULL;
entry = extfs_find_entry (archive->root_entry, q, 0, 0);
if (entry == NULL && (flags & O_CREAT)) {
/* Create new entry */
entry = extfs_find_entry (archive->root_entry, q, 0, 1);
created = (entry != NULL);
}
g_free (q);
if (entry == NULL)
return NULL;
if ((entry = extfs_resolve_symlinks (entry)) == NULL)
return NULL;
if (S_ISDIR (entry->inode->mode))
ERRNOR (EISDIR, NULL);
if (entry->inode->local_filename == NULL) {
char *local_filename;
local_handle = vfs_mkstemps (&local_filename, "extfs", entry->name);
if (local_handle == -1)
return NULL;
close (local_handle);
if (!created && !(flags & O_TRUNC)
&& extfs_cmd (" copyout ", archive, entry, local_filename)) {
unlink (local_filename);
free (local_filename);
my_errno = EIO;
return NULL;
}
entry->inode->local_filename = local_filename;
}
local_handle =
open (entry->inode->local_filename, NO_LINEAR (flags), mode);
if (local_handle == -1)
ERRNOR (EIO, NULL);
extfs_info = g_new (struct pseudofile, 1);
extfs_info->archive = archive;
extfs_info->entry = entry;
extfs_info->has_changed = created;
extfs_info->local_handle = local_handle;
/* i.e. we had no open files and now we have one */
vfs_rmstamp (&vfs_extfs_ops, (vfsid) archive);
archive->fd_usage++;
return extfs_info;
}
static ssize_t extfs_read (void *data, char *buffer, int count)
{
struct pseudofile *file = (struct pseudofile *)data;
return read (file->local_handle, buffer, count);
}
static int
extfs_close (void *data)
{
struct pseudofile *file;
int errno_code = 0;
file = (struct pseudofile *) data;
close (file->local_handle);
/* Commit the file if it has changed */
if (file->has_changed) {
if (extfs_cmd
(" copyin ", file->archive, file->entry,
file->entry->inode->local_filename))
errno_code = EIO;
{
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)
vfs_stamp_create (&vfs_extfs_ops, file->archive);
g_free (data);
if (errno_code)
ERRNOR (EIO, -1);
return 0;
}
#define RECORDSIZE 512
static struct entry*
extfs_find_entry_int (struct entry *dir, char *name,
struct loop_protect *list, int make_dirs, int make_file)
{
struct entry *pent, *pdir;
char *p, *q, *name_end;
char c;
if (*name == '/') { /* Handle absolute paths */
name++;
dir = dir->inode->archive->root_entry;
}
pent = dir;
p = name;
name_end = name + strlen (name);
q = strchr (p, '/');
c = '/';
if (!q)
q = strchr (p, 0);
for (; pent != NULL && c && *p; ){
c = *q;
*q = 0;
if (strcmp (p, ".")){
if (!strcmp (p, ".."))
pent = pent->dir;
else {
if ((pent = extfs_resolve_symlinks_int (pent, list))==NULL){
*q = c;
return NULL;
}
if (!S_ISDIR (pent->inode->mode)){
*q = c;
notadir = 1;
return NULL;
}
pdir = pent;
for (pent = pent->inode->first_in_subdir; pent; pent = pent->next_in_dir)
/* Hack: I keep the original semanthic unless
q+1 would break in the strchr */
if (!strcmp (pent->name, p)){
if (q + 1 > name_end){
*q = c;
notadir = !S_ISDIR (pent->inode->mode);
return pent;
}
break;
}
/* When we load archive, we create automagically
* non-existant directories
*/
if (pent == NULL && make_dirs) {
pent = extfs_generate_entry (dir->inode->archive, p, pdir, S_IFDIR | 0777);
}
if (pent == NULL && make_file) {
pent = extfs_generate_entry (dir->inode->archive, p, pdir, S_IFREG | 0666);
}
}
}
/* Next iteration */
*q = c;
p = q + 1;
q = strchr (p, '/');
if (!q)
q = strchr (p, 0);
}
if (pent == NULL)
my_errno = ENOENT;
return pent;
}
static struct entry *extfs_find_entry (struct entry *dir, char *name, int make_dirs, int make_file)
{
struct entry *res;
errloop = 0;
notadir = 0;
res = extfs_find_entry_int (dir, name, NULL, make_dirs, make_file);
if (res == NULL) {
if (errloop)
my_errno = ELOOP;
else if (notadir)
my_errno = ENOTDIR;
}
return res;
}
static int extfs_errno (struct vfs_class *me)
{
(void) me;
return my_errno;
}
static void * extfs_opendir (struct vfs_class *me, const char *dirname)
{
struct archive *archive = NULL;
char *q;
struct entry *entry;
struct entry **info;
if ((q = extfs_get_path (me, dirname, &archive, 0)) == NULL)
return NULL;
entry = extfs_find_entry (archive->root_entry, q, 0, 0);
g_free (q);
if (entry == NULL)
return NULL;
if ((entry = extfs_resolve_symlinks (entry)) == NULL)
return NULL;
if (!S_ISDIR (entry->inode->mode)) ERRNOR (ENOTDIR, NULL);
info = g_new (struct entry *, 2);
info[0] = entry->inode->first_in_subdir;
info[1] = entry->inode->first_in_subdir;
return info;
}
static void * extfs_readdir(void *data)
{
static union vfs_dirent dir;
struct entry **info = (struct entry **) data;
if (!*info)
return NULL;
g_strlcpy(dir.dent.d_name, (*info)->name, MC_MAXPATHLEN);
compute_namelen(&dir.dent);
*info = (*info)->next_in_dir;
return (void *) &dir;
}
static int extfs_closedir (void *data)
{
g_free (data);
return 0;
}
static void extfs_stat_move (struct stat *buf, const struct inode *inode)
{
buf->st_dev = inode->dev;
buf->st_ino = inode->inode;
buf->st_mode = inode->mode;
buf->st_nlink = inode->nlink;
buf->st_uid = inode->uid;
buf->st_gid = inode->gid;
#ifdef HAVE_STRUCT_STAT_ST_RDEV
buf->st_rdev = inode->rdev;
#endif
buf->st_size = inode->size;
#ifdef HAVE_STRUCT_STAT_ST_BLKSIZE
buf->st_blksize = RECORDSIZE;
#endif
#ifdef HAVE_STRUCT_STAT_ST_BLOCKS
buf->st_blocks = (inode->size + RECORDSIZE - 1) / RECORDSIZE;
#endif
buf->st_atime = inode->atime;
buf->st_mtime = inode->mtime;
buf->st_ctime = inode->ctime;
}
static int
extfs_internal_stat (struct vfs_class *me, const char *path, struct stat *buf,
int resolve)
{
struct archive *archive;
char *q;
struct entry *entry;
char *path2 = g_strdup (path);
int result = -1;
if ((q = extfs_get_path_mangle (me, path2, &archive, 0)) == NULL)
goto cleanup;
entry = extfs_find_entry (archive->root_entry, q, 0, 0);
if (entry == NULL)
goto cleanup;
if (resolve && (entry = extfs_resolve_symlinks (entry)) == NULL)
goto cleanup;
extfs_stat_move (buf, entry->inode);
result = 0;
cleanup:
g_free (path2);
return result;
}
static int extfs_stat (struct vfs_class *me, const char *path, struct stat *buf)
{
return extfs_internal_stat (me, path, buf, 1);
}
static int extfs_lstat (struct vfs_class *me, const char *path, struct stat *buf)
{
return extfs_internal_stat (me, path, buf, 0);
}
static int extfs_fstat (void *data, struct stat *buf)
{
struct pseudofile *file = (struct pseudofile *)data;
extfs_stat_move (buf, file->entry->inode);
return 0;
}
static int
extfs_readlink (struct vfs_class *me, const char *path, char *buf, size_t size)
{
struct archive *archive;
char *q;
size_t len;
struct entry *entry;
char *mpath = g_strdup (path);
int result = -1;
if ((q = extfs_get_path_mangle (me, mpath, &archive, 0)) == NULL)
goto cleanup;
entry = extfs_find_entry (archive->root_entry, q, 0, 0);
if (entry == NULL)
goto cleanup;
if (!S_ISLNK (entry->inode->mode)) {
me->verrno = EINVAL;
goto cleanup;
}
len = strlen (entry->inode->linkname);
if (size < len)
len = size;
/* readlink() does not append a NUL character to buf */
memcpy (buf, entry->inode->linkname, result = len);
cleanup:
g_free (mpath);
return result;
}
static int extfs_chmod (struct vfs_class *me, const char *path, int mode)
{
(void) me;
(void) path;
(void) mode;
return 0;
}
static ssize_t extfs_write (void *data, const char *buf, int nbyte)
{
struct pseudofile *file = (struct pseudofile *)data;
file->has_changed = 1;
return write (file->local_handle, buf, nbyte);
}
static int extfs_unlink (struct vfs_class *me, const char *file)
{
struct archive *archive;
char *q, *mpath = g_strdup (file);
struct entry *entry;
int result = -1;
if ((q = extfs_get_path_mangle (me, mpath, &archive, 0)) == NULL)
goto cleanup;
entry = extfs_find_entry (archive->root_entry, q, 0, 0);
if (entry == NULL)
goto cleanup;
if ((entry = extfs_resolve_symlinks (entry)) == NULL)
goto cleanup;
if (S_ISDIR (entry->inode->mode)) {
me->verrno = EISDIR;
goto cleanup;
}
if (extfs_cmd (" rm ", archive, entry, "")){
my_errno = EIO;
goto cleanup;
}
extfs_remove_entry (entry);
result = 0;
cleanup:
g_free (mpath);
return result;
}
static int extfs_mkdir (struct vfs_class *me, const char *path, mode_t mode)
{
struct archive *archive;
char *q, *mpath = g_strdup(path);
struct entry *entry;
int result = -1;
(void) mode;
if ((q = extfs_get_path_mangle (me, mpath, &archive, 0)) == NULL)
goto cleanup;
entry = extfs_find_entry (archive->root_entry, q, 0, 0);
if (entry != NULL) {
me->verrno = EEXIST;
goto cleanup;
}
entry = extfs_find_entry (archive->root_entry, q, 1, 0);
if (entry == NULL)
goto cleanup;
if ((entry = extfs_resolve_symlinks (entry)) == NULL)
goto cleanup;
if (!S_ISDIR (entry->inode->mode)) {
me->verrno = ENOTDIR;
goto cleanup;
}
if (extfs_cmd (" mkdir ", archive, entry, "")){
my_errno = EIO;
extfs_remove_entry (entry);
goto cleanup;
}
result = 0;
cleanup:
g_free (mpath);
return result;
}
static int extfs_rmdir (struct vfs_class *me, const char *path)
{
struct archive *archive;
char *q, *mpath = g_strdup(path);
struct entry *entry;
int result = -1;
if ((q = extfs_get_path_mangle (me, mpath, &archive, 0)) == NULL)
goto cleanup;
entry = extfs_find_entry (archive->root_entry, q, 0, 0);
if (entry == NULL)
goto cleanup;
if ((entry = extfs_resolve_symlinks (entry)) == NULL)
goto cleanup;
if (!S_ISDIR (entry->inode->mode)) {
me->verrno = ENOTDIR;
goto cleanup;
}
if (extfs_cmd (" rmdir ", archive, entry, "")){
my_errno = EIO;
goto cleanup;
}
extfs_remove_entry (entry);
result = 0;
cleanup:
g_free (mpath);
return result;
}
static int
extfs_chdir (struct vfs_class *me, const char *path)
{
struct archive *archive = NULL;
char *q;
struct entry *entry;
my_errno = ENOTDIR;
if ((q = extfs_get_path (me, path, &archive, 0)) == NULL)
return -1;
entry = extfs_find_entry (archive->root_entry, q, 0, 0);
g_free (q);
if (!entry)
return -1;
entry = extfs_resolve_symlinks (entry);
if ((!entry) || (!S_ISDIR (entry->inode->mode)))
return -1;
my_errno = 0;
return 0;
}
static off_t extfs_lseek (void *data, off_t offset, int whence)
{
struct pseudofile *file = (struct pseudofile *) data;
return lseek (file->local_handle, offset, whence);
}
static vfsid
extfs_getid (struct vfs_class *me, const char *path)
{
struct archive *archive = NULL;
char *p;
if (!(p = extfs_get_path (me, path, &archive, 1)))
return NULL;
g_free (p);
return (vfsid) archive;
}
static int extfs_nothingisopen (vfsid id)
{
if (((struct archive *)id)->fd_usage <= 0)
return 1;
return 0;
}
static void extfs_remove_entry (struct entry *e)
{
int i = --(e->inode->nlink);
struct entry *pe, *ent, *prev;
if (S_ISDIR (e->inode->mode) && e->inode->first_in_subdir != NULL) {
struct entry *f = e->inode->first_in_subdir;
e->inode->first_in_subdir = NULL;
extfs_remove_entry (f);
}
pe = e->dir;
if (e == pe->inode->first_in_subdir)
pe->inode->first_in_subdir = e->next_in_dir;
prev = NULL;
for (ent = pe->inode->first_in_subdir; ent && ent->next_in_dir;
ent = ent->next_in_dir)
if (e == ent->next_in_dir) {
prev = ent;
break;
}
if (prev)
prev->next_in_dir = e->next_in_dir;
if (e == pe->inode->last_in_subdir)
pe->inode->last_in_subdir = prev;
if (i <= 0) {
if (e->inode->local_filename != NULL) {
unlink (e->inode->local_filename);
free (e->inode->local_filename);
}
g_free (e->inode->linkname);
g_free (e->inode);
}
g_free (e->name);
g_free (e);
}
static void extfs_free_entry (struct entry *e)
{
int i = --(e->inode->nlink);
if (S_ISDIR (e->inode->mode) && e->inode->first_in_subdir != NULL) {
struct entry *f = e->inode->first_in_subdir;
e->inode->first_in_subdir = NULL;
extfs_free_entry (f);
}
if (i <= 0) {
if (e->inode->local_filename != NULL) {
unlink (e->inode->local_filename);
free (e->inode->local_filename);
}
g_free (e->inode->linkname);
g_free (e->inode);
}
if (e->next_in_dir != NULL)
extfs_free_entry (e->next_in_dir);
g_free (e->name);
g_free (e);
}
static void extfs_free (vfsid id)
{
struct archive *parc;
struct archive *archive = (struct archive *)id;
if (archive == first_archive) {
first_archive = archive->next;
} else {
for (parc = first_archive; parc != NULL; parc = parc->next)
if (parc->next == archive) {
parc->next = archive->next;
break;
}
}
extfs_free_archive (archive);
}
static char *
extfs_getlocalcopy (struct vfs_class *me, const char *path)
{
struct pseudofile *fp =
(struct pseudofile *) extfs_open (me, 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 = g_strdup (fp->entry->inode->local_filename);
fp->archive->fd_usage++;
extfs_close ((void *) fp);
return p;
}
static int
extfs_ungetlocalcopy (struct vfs_class *me, const char *path,
const char *local, int has_changed)
{
struct pseudofile *fp =
(struct pseudofile *) extfs_open (me, path, O_RDONLY, 0);
if (fp == NULL)
return 0;
if (!strcmp (fp->entry->inode->local_filename, local)) {
fp->archive->fd_usage--;
fp->has_changed |= has_changed;
extfs_close ((void *) fp);
return 0;
} else {
/* Should not happen */
extfs_close ((void *) fp);
return 0;
}
}
static int extfs_init (struct vfs_class *me)
{
FILE *cfg;
char *mc_extfsini;
char key[256];
(void) me;
mc_extfsini = concat_dir_and_file (mc_home, "extfs" PATH_SEP_STR "extfs.ini");
cfg = fopen (mc_extfsini, "r");
/* We may not use vfs_die() message or message or similar,
* UI is not initialized at this time and message would not
* appear on screen. */
if (!cfg) {
fprintf (stderr, _("Warning: file %s not found\n"), mc_extfsini);
g_free (mc_extfsini);
return 0;
}
extfs_no = 0;
while (extfs_no < MAXEXTFS && fgets (key, sizeof (key), cfg)) {
char *c;
/* Handle those with a trailing ':', those flag that the
* file system does not require an archive to work
*/
if (*key == '[') {
fprintf(stderr, "Warning: You need to update your %s file.\n",
mc_extfsini);
fclose(cfg);
g_free (mc_extfsini);
return 0;
}
if (*key == '#' || *key == '\n')
continue;
if ((c = strchr (key, '\n'))){
*c-- = 0;
} else { /* Last line without newline or strlen (key) > 255 */
c = &key [strlen (key) - 1];
}
extfs_need_archive [extfs_no] = !(*c == ':');
if (*c == ':')
*c = 0;
if (!(*key))
continue;
extfs_prefixes [extfs_no++] = g_strdup (key);
}
fclose(cfg);
g_free (mc_extfsini);
return 1;
}
static int extfs_which (struct vfs_class *me, const char *path)
{
int i;
(void) me;
for (i = 0; i < extfs_no; i++)
if (!strcmp (path, extfs_prefixes [i]))
return i;
return -1;
}
static void extfs_done (struct vfs_class *me)
{
int i;
struct archive *ar;
(void) me;
for (ar = first_archive; ar != NULL;) {
extfs_free ((vfsid) ar);
ar = first_archive;
}
for (i = 0; i < extfs_no; i++ )
g_free (extfs_prefixes [i]);
extfs_no = 0;
}
static int
extfs_setctl (struct vfs_class *me, const char *path, int ctlop, void *arg)
{
(void) arg;
if (ctlop == VFS_SETCTL_RUN) {
extfs_run (me, path);
return 1;
}
return 0;
}
void
init_extfs (void)
{
vfs_extfs_ops.name = "extfs";
vfs_extfs_ops.init = extfs_init;
vfs_extfs_ops.done = extfs_done;
vfs_extfs_ops.fill_names = extfs_fill_names;
vfs_extfs_ops.which = extfs_which;
vfs_extfs_ops.open = extfs_open;
vfs_extfs_ops.close = extfs_close;
vfs_extfs_ops.read = extfs_read;
vfs_extfs_ops.write = extfs_write;
vfs_extfs_ops.opendir = extfs_opendir;
vfs_extfs_ops.readdir = extfs_readdir;
vfs_extfs_ops.closedir = extfs_closedir;
vfs_extfs_ops.stat = extfs_stat;
vfs_extfs_ops.lstat = extfs_lstat;
vfs_extfs_ops.fstat = extfs_fstat;
vfs_extfs_ops.chmod = extfs_chmod;
vfs_extfs_ops.readlink = extfs_readlink;
vfs_extfs_ops.unlink = extfs_unlink;
vfs_extfs_ops.chdir = extfs_chdir;
vfs_extfs_ops.ferrno = extfs_errno;
vfs_extfs_ops.lseek = extfs_lseek;
vfs_extfs_ops.getid = extfs_getid;
vfs_extfs_ops.nothingisopen = extfs_nothingisopen;
vfs_extfs_ops.free = extfs_free;
vfs_extfs_ops.getlocalcopy = extfs_getlocalcopy;
vfs_extfs_ops.ungetlocalcopy = extfs_ungetlocalcopy;
vfs_extfs_ops.mkdir = extfs_mkdir;
vfs_extfs_ops.rmdir = extfs_rmdir;
vfs_extfs_ops.setctl = extfs_setctl;
vfs_register_class (&vfs_extfs_ops);
}
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