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Commit 1bf17726 authored by Tao Bao's avatar Tao Bao
Browse files

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

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 d0f3088a)
parent 9ab6af5a

updater/install.cpp

+28 −1
Original line number Diff line number Diff line
@@ -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);