allow recovery packages to wipe cache

updater now has a function "wipe_cache();" which causes recovery to
wipe the cache partition after the successful installation of the
package.  Move log copying around a bit so logs and the last_install
flag file are copied to cache after it's wiped.

Bug: 5314244
Change-Id: Id35a9eb6dcd626c8f3a3a0076074f462ed3d44bd

1 files changed, 10 insertions, 0 deletions

diff --git a/updater/install.c b/updater/install.c
index 0396bae..7b4b99b 100644
--- a/updater/install.c
+++ b/updater/install.c
@@ -1024,6 +1024,14 @@ Value* UIPrintFn(const char* name, State* state, int argc, Expr* argv[]) {
     return StringValue(buffer);
 }
 
+Value* WipeCacheFn(const char* name, State* state, int argc, Expr* argv[]) {
+    if (argc != 0) {
+        return ErrorAbort(state, "%s() expects no args, got %d", name, argc);
+    }
+    fprintf(((UpdaterInfo*)(state->cookie))->cmd_pipe, "wipe_cache\n");
+    return StringValue(strdup("t"));
+}
+
 Value* RunProgramFn(const char* name, State* state, int argc, Expr* argv[]) {
     if (argc < 1) {
         return ErrorAbort(state, "%s() expects at least 1 arg", name);
@@ -1198,6 +1206,8 @@ void RegisterInstallFunctions() {
     RegisterFunction("read_file", ReadFileFn);
     RegisterFunction("sha1_check", Sha1CheckFn);
 
+    RegisterFunction("wipe_cache", WipeCacheFn);
+
     RegisterFunction("ui_print", UIPrintFn);
 
     RegisterFunction("run_program", RunProgramFn);