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#include <stdio.h>
#include <string.h>
#include <fcntl.h>
#include <errno.h>
#include <unistd.h>
#include <sys/stat.h>
#include <sys/types.h>
#include "pathnames.h"
#include "fsprobe.h"
#include "sundries.h" /* for xstrdup */
#include "nls.h"
/* list of already tested filesystems by fsprobe_procfsloop_mount() */
static struct tried {
struct tried *next;
char *type;
} *tried = NULL;
static int
was_tested(const char *fstype) {
struct tried *t;
if (fsprobe_known_fstype(fstype))
return 1;
for (t = tried; t; t = t->next) {
if (!strcmp(t->type, fstype))
return 1;
}
return 0;
}
static void
set_tested(const char *fstype) {
struct tried *t = xmalloc(sizeof(struct tried));
t->next = tried;
t->type = xstrdup(fstype);
tried = t;
}
static void
free_tested(void) {
struct tried *t, *tt;
t = tried;
while(t) {
free(t->type);
tt = t->next;
free(t);
t = tt;
}
tried = NULL;
}
static char *
procfsnext(FILE *procfs) {
char line[100];
char fsname[100];
while (fgets(line, sizeof(line), procfs)) {
if (sscanf (line, "nodev %[^\n]\n", fsname) == 1) continue;
if (sscanf (line, " %[^ \n]\n", fsname) != 1) continue;
return xstrdup(fsname);
}
return 0;
}
/* Only use /proc/filesystems here, this is meant to test what
the kernel knows about, so /etc/filesystems is irrelevant.
Return: 1: yes, 0: no, -1: cannot open procfs */
int
fsprobe_known_fstype_in_procfs(const char *type)
{
FILE *procfs;
char *fsname;
int ret = -1;
procfs = fopen(_PATH_PROC_FILESYSTEMS, "r");
if (procfs) {
ret = 0;
while ((fsname = procfsnext(procfs)) != NULL)
if (!strcmp(fsname, type)) {
ret = 1;
break;
}
fclose(procfs);
procfs = NULL;
}
return ret;
}
/* Try all types in FILESYSTEMS, except those in *types,
in case *types starts with "no" */
/* return: 0: OK, -1: error in errno, 1: type not found */
/* when 0 or -1 is returned, *types contains the type used */
/* when 1 is returned, *types is NULL */
int
fsprobe_procfsloop_mount(int (*mount_fn)(struct mountargs *, int *, int *),
struct mountargs *args,
const char **types,
int *special, int *status)
{
char *files[2] = { _PATH_FILESYSTEMS, _PATH_PROC_FILESYSTEMS };
FILE *procfs;
char *fsname;
const char *notypes = NULL;
int no = 0;
int ret = 1;
int errsv = 0;
int i;
if (*types && !strncmp(*types, "no", 2)) {
no = 1;
notypes = (*types) + 2;
}
*types = NULL;
/* Use _PATH_PROC_FILESYSTEMS only when _PATH_FILESYSTEMS
* (/etc/filesystems) does not exist. In some cases trying a
* filesystem that the kernel knows about on the wrong data will crash
* the kernel; in such cases _PATH_FILESYSTEMS can be used to list the
* filesystems that we are allowed to try, and in the order they should
* be tried. End _PATH_FILESYSTEMS with a line containing a single '*'
* only, if _PATH_PROC_FILESYSTEMS should be tried afterwards.
*/
for (i=0; i<2; i++) {
procfs = fopen(files[i], "r");
if (!procfs)
continue;
while ((fsname = procfsnext(procfs)) != NULL) {
if (!strcmp(fsname, "*")) {
fclose(procfs);
goto nexti;
}
if (was_tested (fsname))
continue;
if (no && matching_type(fsname, notypes))
continue;
set_tested (fsname);
args->type = fsname;
if (verbose)
printf(_("Trying %s\n"), fsname);
if ((*mount_fn) (args, special, status) == 0) {
*types = fsname;
ret = 0;
break;
} else if (errno != EINVAL &&
fsprobe_known_fstype_in_procfs(fsname) == 1) {
*types = "guess";
ret = -1;
errsv = errno;
break;
}
}
free_tested();
fclose(procfs);
errno = errsv;
return ret;
nexti:;
}
return 1;
}
const char *
fsprobe_get_devname_for_mounting(const char *spec)
{
char *name, *value;
if (!spec)
return NULL;
if (is_pseudo_fs(spec))
return xstrdup(spec);
if (parse_spec(spec, &name, &value) != 0)
return NULL; /* parse error */
if (name) {
const char *nspec = NULL;
if (!strcmp(name,"LABEL"))
nspec = fsprobe_get_devname_by_label(value);
else if (!strcmp(name,"UUID"))
nspec = fsprobe_get_devname_by_uuid(value);
if (nspec && verbose > 1)
printf(_("mount: going to mount %s by %s\n"), spec, name);
free((void *) name);
return nspec;
}
/* no LABEL, no UUID, .. probably a path */
if (verbose > 1)
printf(_("mount: no LABEL=, no UUID=, going to mount %s by path\n"), spec);
return canonicalize(spec);
}
/* like fsprobe_get_devname_for_mounting(), but without verbose messages */
const char *
fsprobe_get_devname(const char *spec)
{
char *name, *value;
if (!spec)
return NULL;
if (is_pseudo_fs(spec))
return xstrdup(spec);
if (parse_spec(spec, &name, &value) != 0)
return NULL; /* parse error */
if (name) {
const char *nspec = NULL;
if (!strcmp(name,"LABEL"))
nspec = fsprobe_get_devname_by_label(value);
else if (!strcmp(name,"UUID"))
nspec = fsprobe_get_devname_by_uuid(value);
free((void *) name);
return nspec;
}
return canonicalize(spec);
}
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