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Commit 49d25981 authored by Wei Wang's avatar Wei Wang
Browse files

init: add a copy_per_line built-in command 

There are sysfs nodes that don't take multiple inputs, adding a new
copy_per_line built-in command to copy from source file to destination
line by line.

Bug: 171740453
Test: boot and check file and log
Change-Id: I41b7a565829299d56b81d4509525dfa6a0a52444
parent 48c35f0c

init/README.md

+4 −0
Original line number Diff line number Diff line
@@ -451,6 +451,10 @@ Commands 
  exist. And it will be truncated if dst file is a normal regular file and

  already exists.



`copy_per_line <src> <dst>`

> Copies a file line by line. Similar to copy, but useful for dst is a sysfs node

  that doesn't handle multiple lines of data.



`domainname <name>`

> Set the domain name.

init/builtins.cpp

+19 −0
Original line number Diff line number Diff line
@@ -88,6 +88,7 @@ using namespace std::literals::string_literals; 


using android::base::Basename;

using android::base::SetProperty;

using android::base::Split;

using android::base::StartsWith;

using android::base::StringPrintf;

using android::base::unique_fd;
@@ -968,6 +969,23 @@ static Result<void> do_copy(const BuiltinArguments& args) { 
    return {};

}



static Result<void> do_copy_per_line(const BuiltinArguments& args) {

    std::string file_contents;

    if (!android::base::ReadFileToString(args[1], &file_contents, true)) {

        return Error() << "Could not read input file '" << args[1] << "'";

    }

    auto lines = Split(file_contents, "\n");

    for (const auto& line : lines) {

        auto result = WriteFile(args[2], line);

        if (!result.ok()) {

            LOG(VERBOSE) << "Could not write to output file '" << args[2] << "' with '" << line

                         << "' : " << result.error();

        }

    }



    return {};

}



static Result<void> do_chown(const BuiltinArguments& args) {

    auto uid = DecodeUid(args[1]);

    if (!uid.ok()) {
@@ -1366,6 +1384,7 @@ const BuiltinFunctionMap& GetBuiltinFunctionMap() { 
        {"class_start_post_data",   {1,     1,    {false,  do_class_start_post_data}}},

        {"class_stop",              {1,     1,    {false,  do_class_stop}}},

        {"copy",                    {2,     2,    {true,   do_copy}}},

        {"copy_per_line",           {2,     2,    {true,   do_copy_per_line}}},

        {"domainname",              {1,     1,    {true,   do_domainname}}},

        {"enable",                  {1,     1,    {false,  do_enable}}},

        {"exec",                    {1,     kMax, {false,  do_exec}}},