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#include "c.h"
#include "pathnames.h"
#include "xalloc.h"
#include "nls.h"
#include "lsblk.h"
static struct libmnt_table *mtab, *swaps;
static struct libmnt_cache *mntcache;
static int table_parser_errcb(struct libmnt_table *tb __attribute__((__unused__)),
const char *filename, int line)
{
if (filename)
warnx(_("%s: parse error at line %d -- ignored"), filename, line);
return 1;
}
static struct libmnt_fs *get_active_swap(const char *filename)
{
assert(filename);
if (!swaps) {
swaps = mnt_new_table();
if (!swaps)
return 0;
if (!mntcache)
mntcache = mnt_new_cache();
mnt_table_set_parser_errcb(swaps, table_parser_errcb);
mnt_table_set_cache(swaps, mntcache);
if (!lsblk->sysroot)
mnt_table_parse_swaps(swaps, NULL);
else {
char buf[PATH_MAX];
snprintf(buf, sizeof(buf), "%s" _PATH_PROC_SWAPS, lsblk->sysroot);
mnt_table_parse_swaps(swaps, buf);
}
}
return mnt_table_find_srcpath(swaps, filename, MNT_ITER_BACKWARD);
}
void lsblk_device_free_filesystems(struct lsblk_device *dev)
{
if (!dev)
return;
free(dev->fss);
dev->fss = NULL;
dev->nfss = 0;
dev->is_mounted = 0;
dev->is_swap = 0;
}
static void add_filesystem(struct lsblk_device *dev, struct libmnt_fs *fs)
{
assert(dev);
assert(fs);
dev->fss = xreallocarray(dev->fss, dev->nfss + 1, sizeof(struct libmnt_fs *));
dev->fss[dev->nfss] = fs;
dev->nfss++;
dev->is_mounted = 1;
if (mnt_fs_is_swaparea(fs))
dev->is_swap = 1;
}
struct libmnt_fs **lsblk_device_get_filesystems(struct lsblk_device *dev, size_t *n)
{
struct libmnt_fs *fs;
struct libmnt_iter *itr = NULL;
dev_t devno;
assert(dev);
assert(dev->filename);
if (dev->is_mounted)
goto done;
lsblk_device_free_filesystems(dev); /* reset */
if (!mtab) {
mtab = mnt_new_table();
if (!mtab)
return NULL;
if (!mntcache)
mntcache = mnt_new_cache();
mnt_table_set_parser_errcb(mtab, table_parser_errcb);
mnt_table_set_cache(mtab, mntcache);
if (!lsblk->sysroot)
mnt_table_parse_mtab(mtab, NULL);
else {
char buf[PATH_MAX];
snprintf(buf, sizeof(buf), "%s" _PATH_PROC_MOUNTINFO, lsblk->sysroot);
mnt_table_parse_mtab(mtab, buf);
}
}
devno = makedev(dev->maj, dev->min);
/* All mountpoint where is used devno or device name
*/
itr = mnt_new_iter(MNT_ITER_BACKWARD);
while (mnt_table_next_fs(mtab, itr, &fs) == 0) {
if (mnt_fs_get_devno(fs) != devno &&
!mnt_fs_streq_srcpath(fs, dev->filename))
continue;
add_filesystem(dev, fs);
}
/* Try mnt_table_find_srcpath() which also canonicalizes patches, etc.
*/
if (!dev->nfss) {
fs = get_active_swap(dev->filename);
if (!fs) {
fs = mnt_table_find_srcpath(mtab, dev->filename, MNT_ITER_BACKWARD);
if (fs)
dev->is_swap = 1;
}
if (fs)
add_filesystem(dev, fs);
}
done:
mnt_free_iter(itr);
if (n)
*n = dev->nfss;
return dev->fss;
}
/* Returns mountpoint where the device is mounted. If the device is used for
* more filesystems (subvolumes, ...) than returns the "best" one.
*/
const char *lsblk_device_get_mountpoint(struct lsblk_device *dev)
{
struct libmnt_fs *fs = NULL;
const char *root;
lsblk_device_get_filesystems(dev, NULL);
if (!dev->nfss)
return NULL;
/* lsblk_device_get_filesystems() scans mountinfo/swaps in backward
* order. It means the first in fss[] is the last mounted FS. Let's
* keep it as default */
fs = dev->fss[0];
root = mnt_fs_get_root(fs);
if (root && strcmp(root, "/") != 0) {
/* FS is subvolume (or subdirectory bind-mount). Try to get
* FS with "/" root */
size_t i;
for (i = 1; i < dev->nfss; i++) {
root = mnt_fs_get_root(dev->fss[i]);
if (!root || strcmp(root, "/") == 0) {
fs = dev->fss[i];
break;
}
}
}
if (mnt_fs_is_swaparea(fs)) {
dev->is_swap = 1;
return "[SWAP]";
}
return mnt_fs_get_target(fs);
}
void lsblk_mnt_init(void)
{
mnt_init_debug(0);
}
void lsblk_mnt_deinit(void)
{
mnt_unref_table(mtab);
mnt_unref_table(swaps);
mnt_unref_cache(mntcache);
}
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