Setup a temporary directory for update_engine_sideload.
When running update_engine_sideload from recovery, the default temp
directory (/data/misc/update_engine/tmp) is not available. This
directory is currently used to store a blob when applying a bspatch
from a child process. This patch uses /tmp/update_engine_sideload as
a temporary directory when running update_engine_sideload from recovery.
Bug: 27178350
TEST=`adb sideload` an incremental update.
(cherry picked from commit 3295102ed64107f966d4cf8bfe733bb936646630)
Change-Id: Icef9dd48b00991975bcf6c39a148f952ef43d9e3
diff --git a/common/utils.h b/common/utils.h
index 63328b6..24bf702 100644
--- a/common/utils.h
+++ b/common/utils.h
@@ -131,6 +131,13 @@
// only returns true if "/dev/ubi%d_0" becomes available in |timeout| seconds.
bool TryAttachingUbiVolume(int volume_num, int timeout);
+// Setup the directory |new_root_temp_dir| to be used as the root directory for
+// temporary files instead of the system's default. If the directory doesn't
+// exists, it will be created when first used.
+// NOTE: The memory pointed by |new_root_temp_dir| must be available until this
+// function is called again with a different value.
+void SetRootTempDir(const char* new_root_temp_dir);
+
// If |base_filename_template| is neither absolute (starts with "/") nor
// explicitly relative to the current working directory (starts with "./" or
// "../"), then it is prepended the system's temporary directory. On success,