[PATCH] Lua: Add function to mount and unmount devices

[ste...@herbrechtsmeier.net]

From: Stefan Herbrechtsmeier <stefan.herb...@weidmueller.com>

Signed-off-by: Stefan Herbrechtsmeier <stefan.herb...@weidmueller.com>
---

corelib/lua_interface.c | 70 +++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 70 insertions(+)

diff --git a/corelib/lua_interface.c b/corelib/lua_interface.c
index 64e5a5f..b8492ae 100644
--- a/corelib/lua_interface.c
+++ b/corelib/lua_interface.c
@@ -10,6 +10,8 @@
#include <unistd.h>
#include <stdbool.h>
#include <errno.h>
+#include <sys/mount.h>
+
#include "lua.h"
#include "lauxlib.h"
#include "lualib.h"
@@ -649,6 +651,72 @@ static int l_info(lua_State *L) {
return 0;
}

+static int l_mount(lua_State *L) {
+ const char *device = luaL_checkstring(L, 1);
+ const char *filesystem = luaL_checkstring(L, 2);
+ char *target;
+
+ if (!device || !strlen(device) || !filesystem || !strlen(filesystem))
+ goto l_mount_exit;
+
+ if (asprintf(&target, "%s%sXXXXXX", get_tmpdir(), DATADST_DIR_SUFFIX) == -1) {
+ TRACE("Unable to allocate memory\n");
+ goto l_mount_exit;
+ }
+
+ if (!mkdtemp(target)) {
+ TRACE("Unable to create a unique temporary directory %s: %s\n",
+ target, strerror(errno));
+ goto l_mount_free_exit;
+ }
+
+ if (mount(device, target, filesystem, 0, NULL) == -1) {
+ TRACE("Device %s with filesystem %s cannot be mounted: %s",
+ device, filesystem, strerror(errno));
+ goto l_mount_rmdir_exit;
+ }
+
+ lua_pop(L, 2);
+ lua_pushstring(L, target);
+
+ free(target);
+
+ return 1;
+
+l_mount_rmdir_exit:
+ rmdir(target);
+l_mount_free_exit:
+ free(target);
+l_mount_exit:
+ lua_pop(L, 2);
+ lua_pushnil(L);
+ return 1;
+}
+
+static int l_umount(lua_State *L) {
+ const char *target = luaL_checkstring(L, 1);
+
+ if (umount(target) == -1) {
+ TRACE("Unable to unmount %s: %s\n", target, strerror(errno));
+ goto l_umount_exit;
+ }
+
+ if (rmdir(target) == -1) {
+ TRACE("Unable to remove directory %s: %s\n", target, strerror(errno));
+ goto l_umount_exit;
+ }
+
+ lua_pop(L, 1);
+ lua_pushboolean(L, true);
+
+ return 1;
+
+l_umount_exit:
+ lua_pop(L, 1);
+ lua_pushnil(L);
+ return 1;
+}
+
static int l_get_bootenv(lua_State *L) {
const char *name = luaL_checkstring(L, 1);
char *value = NULL;
@@ -695,6 +763,8 @@ static const luaL_Reg l_swupdate[] = {
{ "error", l_error },
{ "trace", l_trace },
{ "info", l_info },
+ { "mount", l_mount },
+ { "umount", l_umount },
{ NULL, NULL }
};

--
2.7.4

[Stefano Babic]

Applied to -master, thanks !

Best regards,
Stefano Babic


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