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Make grub-mount exit non-zero if opening the device or filesystem fails. 

Translate GRUB error codes into OS error codes for FUSE.
This commit is contained in:
Colin Watson 2011-04-10 21:41:55 +01:00
parent f387685926
commit 5b3633002b
1 changed files with 91 additions and 41 deletions
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132
util/grub-mount.c
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@ -44,6 +44,8 @@
#include "argp.h"
static char *root = NULL;
grub_device_t dev = NULL;
grub_fs_t fs = NULL;
static char **images = NULL;
static char *debug_str = NULL;
static char **fuse_args = NULL;
@ -62,13 +64,61 @@ execute_command (char *name, int n, char **args)
return (cmd->func) (cmd, n, args);
}
/* Translate GRUB error numbers into OS error numbers. Print any unexpected
errors. */
static int
translate_error (void)
{
int ret;
switch (grub_errno)
{
case GRUB_ERR_NONE:
ret = 0;
break;
case GRUB_ERR_OUT_OF_MEMORY:
grub_print_error ();
ret = -ENOMEM;
break;
case GRUB_ERR_BAD_FILE_TYPE:
/* This could also be EISDIR. Take a guess. */
ret = -ENOTDIR;
break;
case GRUB_ERR_FILE_NOT_FOUND:
ret = -ENOENT;
break;
case GRUB_ERR_FILE_READ_ERROR:
case GRUB_ERR_READ_ERROR:
case GRUB_ERR_IO:
grub_print_error ();
ret = -EIO;
break;
case GRUB_ERR_SYMLINK_LOOP:
ret = -ELOOP;
break;
default:
grub_print_error ();
ret = -EINVAL;
break;
}
/* Any previous errors were handled. */
grub_errno = GRUB_ERR_NONE;
return ret;
}
static int
fuse_getattr (const char *path, struct stat *st)
{
char *filename, *pathname, *path2;
const char *pathname_t;
grub_fs_t fs;
grub_device_t dev;
struct grub_dirhook_info file_info;
int file_exists = 0;
@ -104,16 +154,6 @@ fuse_getattr (const char *path, struct stat *st)
}
file_exists = 0;
dev = grub_device_open (0);
if (! dev)
return -1;
fs = grub_fs_probe (dev);
if (! fs)
{
grub_device_close (dev);
return -1;
}
pathname_t = grub_strchr (path, ')');
if (! pathname_t)
@ -143,10 +183,12 @@ fuse_getattr (const char *path, struct stat *st)
/* It's the whole device. */
(fs->dir) (dev, path2, find_file);
grub_device_close (dev);
grub_free (path2);
if (!file_exists)
return -1;
{
grub_errno = GRUB_ERR_NONE;
return -ENOENT;
}
st->st_dev = 0;
st->st_ino = 0;
st->st_mode = file_info.dir ? (0555 | S_IFDIR) : (0444 | S_IFREG);
@ -158,10 +200,7 @@ fuse_getattr (const char *path, struct stat *st)
grub_file_t file;
file = grub_file_open (path);
if (! file)
{
grub_print_error ();
return -1;
}
return translate_error ();
st->st_size = file->size;
grub_file_close (file);
}
@ -171,6 +210,7 @@ fuse_getattr (const char *path, struct stat *st)
st->st_blocks = (st->st_size + 511) >> 9;
st->st_atime = st->st_mtime = st->st_ctime = file_info.mtimeset
? file_info.mtime : 0;
grub_errno = GRUB_ERR_NONE;
return 0;
}
@ -190,13 +230,11 @@ fuse_open (const char *path, struct fuse_file_info *fi __attribute__ ((unused)))
grub_file_t file;
file = grub_file_open (path);
if (! file)
{
grub_print_error ();
return -1;
}
return translate_error ();
files[first_fd++] = file;
fi->fh = first_fd;
files[first_fd++] = file;
grub_errno = GRUB_ERR_NONE;
return 0;
}
@ -205,13 +243,21 @@ fuse_read (const char *path, char *buf, size_t sz, off_t off,
struct fuse_file_info *fi)
{
grub_file_t file = files[fi->fh];
grub_ssize_t size;
if (off > file->size)
return -1;
return -EINVAL;
file->offset = off;
return grub_file_read (file, buf, sz);
size = grub_file_read (file, buf, sz);
if (size < 0)
return translate_error ();
else
{
grub_errno = GRUB_ERR_NONE;
return size;
}
}
static int
@ -219,6 +265,7 @@ fuse_release (const char *path, struct fuse_file_info *fi)
{
grub_file_close (files[fi->fh]);
files[fi->fh] = NULL;
grub_errno = GRUB_ERR_NONE;
return 0;
}
@ -227,8 +274,6 @@ fuse_readdir (const char *path, void *buf,
fuse_fill_dir_t fill, off_t off, struct fuse_file_info *fi)
{
char *pathname;
grub_fs_t fs;
grub_device_t dev;
auto int call_fill (const char *filename,
const struct grub_dirhook_info *info);
@ -238,19 +283,6 @@ fuse_readdir (const char *path, void *buf,
return 0;
}
dev = grub_device_open (0);
if (! dev)
{
return 1;
}
fs = grub_fs_probe (dev);
if (! fs)
{
grub_device_close (dev);
return 1;
}
pathname = xstrdup (path);
/* Remove trailing '/'. */
@ -259,8 +291,8 @@ fuse_readdir (const char *path, void *buf,
pathname[grub_strlen (pathname) - 1] = 0;
(fs->dir) (dev, pathname, call_fill);
grub_device_close (dev);
free (pathname);
grub_errno = GRUB_ERR_NONE;
return 0;
}
@ -273,7 +305,7 @@ struct fuse_operations grub_opers = {
.read = fuse_read
};
static void
static grub_err_t
fuse_init (void)
{
int i;
@ -310,6 +342,17 @@ fuse_init (void)
grub_mdraid1x_init ();
grub_lvm_init ();
dev = grub_device_open (0);
if (! dev)
return grub_errno;
fs = grub_fs_probe (dev);
if (! fs)
{
grub_device_close (dev);
return grub_errno;
}
fuse_main (fuse_argc, fuse_args, &grub_opers, NULL);
for (i = 0; i < num_disks; i++)
@ -328,6 +371,8 @@ fuse_init (void)
grub_free (loop_name);
}
return GRUB_ERR_NONE;
}
static struct argp_option options[] = {
@ -447,6 +492,11 @@ main (int argc, char *argv[])
/* Do it. */
fuse_init ();
if (grub_errno)
{
grub_print_error ();
return 1;
}
/* Free resources. */
grub_fini_all ();