fastboot: Don't give parsing error for unsupported 'getvar erase-block-size'.
Couldn't parse erase-block-size '0x'.
Couldn't parse logical-block-size '0x'.
mke2fs 1.43.3 (04-Sep-2016)
...
Some bootloaders explicitly return error on failed query (e.g. walleye),
while others return empty message (e.g. bullhead). We should just return
zero for empty message, instead of giving a misleading parsing error.
Test: `fastboot format userdata` on bullhead, with no parsing error.
Test: `fastboot format userdata` on walleye still works.
Change-Id: I194d41d24679929eccc65bfe895d6ab2a26315b7
diff --git a/fastboot/fastboot.cpp b/fastboot/fastboot.cpp
index c3b1bfb..df755aa 100644
--- a/fastboot/fastboot.cpp
+++ b/fastboot/fastboot.cpp
@@ -1354,7 +1354,7 @@
static unsigned fb_get_flash_block_size(Transport* transport, std::string name) {
std::string sizeString;
- if (!fb_getvar(transport, name.c_str(), &sizeString)) {
+ if (!fb_getvar(transport, name.c_str(), &sizeString) || sizeString.empty()) {
/* This device does not report flash block sizes, so return 0 */
return 0;
}