tequilaOS/platform_bootable_recovery
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DO NOT MERGE updater: Add "write_value()" function.

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write_value(value, filename) writes 'value' to 'filename'. It can be
used to tune device settings when applying an OTA package. For example,
write_value("960000", "/sys/devices/system/cpu/cpu0/cpufreq/scaling_max_freq").

Bug: 32463933
Test: recovery_component_test passes.
Test: Apply an OTA package that contains a call to write_value(), and
      check the result.

Change-Id: Ib009ecb8a45a94353f10c59e2383fe1f49796e35
(cherry picked from commit d0f3088aa9)
This commit is contained in:
Tao Bao 2016-11-03 23:52:01 -07:00
parent 9ab6af5a61
commit 1bf1772625
1 changed files with 28 additions and 1 deletions
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29
updater/install.cpp
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@ -35,8 +35,10 @@
#include <inttypes.h>
#include <memory>
#include <string>
#include <vector>
#include <android-base/file.h>
#include <android-base/parseint.h>
#include <android-base/strings.h>
#include <android-base/stringprintf.h>
@ -966,7 +968,6 @@ Value* GetPropFn(const char* name, State* state, int argc, Expr* argv[]) {
return StringValue(strdup(value));
}
// file_getprop(file, key)
//
// interprets 'file' as a getprop-style file (key=value pairs, one
@ -1428,6 +1429,31 @@ Value* ReadFileFn(const char* name, State* state, int argc, Expr* argv[]) {
return v;
}
// write_value(value, filename)
// Writes 'value' to 'filename'.
// Example: write_value("960000", "/sys/devices/system/cpu/cpu0/cpufreq/scaling_max_freq")
Value* WriteValueFn(const char* name, State* state, int argc, Expr* argv[]) {
if (argc != 2) {
return ErrorAbort(state, kArgsParsingFailure, "%s() expects 2 args, got %d", name, argc);
}
char* value;
char* filename;
if (ReadArgs(state, argv, 2, &value, &filename) < 0) {
return ErrorAbort(state, kArgsParsingFailure, "%s(): Failed to parse the argument(s)",
name);
}
bool ret = android::base::WriteStringToFile(value, filename);
if (!ret) {
printf("%s: Failed to write to \"%s\": %s\n", name, filename, strerror(errno));
}
free(value);
free(filename);
return StringValue(strdup(ret ? "t" : ""));
}
// Immediately reboot the device. Recovery is not finished normally,
// so if you reboot into recovery it will re-start applying the
// current package (because nothing has cleared the copy of the
@ -1627,6 +1653,7 @@ void RegisterInstallFunctions() {
RegisterFunction("read_file", ReadFileFn);
RegisterFunction("sha1_check", Sha1CheckFn);
RegisterFunction("rename", RenameFn);
RegisterFunction("write_value", WriteValueFn);
RegisterFunction("wipe_cache", WipeCacheFn);