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Diffstat (limited to 'sdcard/sdcard.c')
-rw-r--r--sdcard/sdcard.c48
1 files changed, 25 insertions, 23 deletions
diff --git a/sdcard/sdcard.c b/sdcard/sdcard.c
index 316588c45..877a52412 100644
--- a/sdcard/sdcard.c
+++ b/sdcard/sdcard.c
@@ -42,12 +42,10 @@
* permissions at creation, owner, group, and permissions are not
* changeable, symlinks and hardlinks are not createable, etc.
*
- * usage: sdcard <path> <uid> <gid>
- *
- * It must be run as root, but will change to uid/gid as soon as it
- * mounts a filesystem on /storage/sdcard. It will refuse to run if uid or
- * gid are zero.
+ * See usage() for command line options.
*
+ * It must be run as root, but will drop to requested UID/GID as soon as it
+ * mounts a filesystem. It will refuse to run if requested UID/GID are zero.
*
* Things I believe to be true:
*
@@ -57,7 +55,6 @@
* - if an op that returns a fuse_entry fails writing the reply to the
* kernel, you must rollback the refcount to reflect the reference the
* kernel did not actually acquire
- *
*/
#define FUSE_TRACE 0
@@ -72,8 +69,6 @@
#define FUSE_UNKNOWN_INO 0xffffffff
-#define MOUNT_POINT "/storage/sdcard0"
-
/* Maximum number of bytes to write in one request. */
#define MAX_WRITE (256 * 1024)
@@ -425,7 +420,7 @@ static struct node* acquire_or_create_child_locked(
return child;
}
-static void fuse_init(struct fuse *fuse, int fd, const char *path)
+static void fuse_init(struct fuse *fuse, int fd, const char *source_path)
{
pthread_mutex_init(&fuse->lock, NULL);
@@ -435,8 +430,8 @@ static void fuse_init(struct fuse *fuse, int fd, const char *path)
memset(&fuse->root, 0, sizeof(fuse->root));
fuse->root.nid = FUSE_ROOT_ID; /* 1 */
fuse->root.refcount = 2;
- fuse->root.namelen = strlen(path);
- fuse->root.name = strdup(path);
+ fuse->root.namelen = strlen(source_path);
+ fuse->root.name = strdup(source_path);
}
static void fuse_status(struct fuse *fuse, __u64 unique, int err)
@@ -1244,21 +1239,21 @@ quit:
static int usage()
{
- ERROR("usage: sdcard [-t<threads>] <path> <uid> <gid>\n"
+ ERROR("usage: sdcard [-t<threads>] <source_path> <dest_path> <uid> <gid>\n"
" -t<threads>: specify number of threads to use, default -t%d\n"
"\n", DEFAULT_NUM_THREADS);
return 1;
}
-static int run(const char* path, uid_t uid, gid_t gid, int num_threads)
-{
+static int run(const char* source_path, const char* dest_path, uid_t uid, gid_t gid,
+ int num_threads) {
int fd;
char opts[256];
int res;
struct fuse fuse;
/* cleanup from previous instance, if necessary */
- umount2(MOUNT_POINT, 2);
+ umount2(dest_path, 2);
fd = open("/dev/fuse", O_RDWR);
if (fd < 0){
@@ -1270,7 +1265,7 @@ static int run(const char* path, uid_t uid, gid_t gid, int num_threads)
"fd=%i,rootmode=40000,default_permissions,allow_other,user_id=%d,group_id=%d",
fd, uid, gid);
- res = mount("/dev/fuse", MOUNT_POINT, "fuse", MS_NOSUID | MS_NODEV, opts);
+ res = mount("/dev/fuse", dest_path, "fuse", MS_NOSUID | MS_NODEV, opts);
if (res < 0) {
ERROR("cannot mount fuse filesystem (error %d)\n", errno);
goto error;
@@ -1288,7 +1283,7 @@ static int run(const char* path, uid_t uid, gid_t gid, int num_threads)
goto error;
}
- fuse_init(&fuse, fd, path);
+ fuse_init(&fuse, fd, source_path);
umask(0);
res = ignite_fuse(&fuse, num_threads);
@@ -1304,7 +1299,8 @@ error:
int main(int argc, char **argv)
{
int res;
- const char *path = NULL;
+ const char *source_path = NULL;
+ const char *dest_path = NULL;
uid_t uid = 0;
gid_t gid = 0;
int num_threads = DEFAULT_NUM_THREADS;
@@ -1314,8 +1310,10 @@ int main(int argc, char **argv)
char* arg = argv[i];
if (!strncmp(arg, "-t", 2))
num_threads = strtoul(arg + 2, 0, 10);
- else if (!path)
- path = arg;
+ else if (!source_path)
+ source_path = arg;
+ else if (!dest_path)
+ dest_path = arg;
else if (!uid)
uid = strtoul(arg, 0, 10);
else if (!gid)
@@ -1326,8 +1324,12 @@ int main(int argc, char **argv)
}
}
- if (!path) {
- ERROR("no path specified\n");
+ if (!source_path) {
+ ERROR("no source path specified\n");
+ return usage();
+ }
+ if (!dest_path) {
+ ERROR("no dest path specified\n");
return usage();
}
if (!uid || !gid) {
@@ -1339,6 +1341,6 @@ int main(int argc, char **argv)
return usage();
}
- res = run(path, uid, gid, num_threads);
+ res = run(source_path, dest_path, uid, gid, num_threads);
return res < 0 ? 1 : 0;
}