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Commit 500946b6 authored by Artur Satayev's avatar Artur Satayev
Browse files

Introduce load_exports action. 

The action reads a file with individual `export` actions declared on
each line, and calls `setenv` for each.

See go/updatable-classpath for details on how this is going to be used.

Bug: 180105615
Test: manual
Change-Id: I5390e52cf8ffd9c3babf31ed854eeecc727351eb
parent 83eae366

init/README.md

+5 −0
Original line number Diff line number Diff line
@@ -523,6 +523,11 @@ instance. \ 
`interface_start aidl/aidl_lazy_test_1` will start the AIDL service that

provides the `aidl_lazy_test_1` interface.



`load_exports <path>`

> Open the file at _path_ and export global environment variables declared

  there. Each line must be in the format `export <name> <value>`, as described

  above.



`load_system_props`

> (This action is deprecated and no-op.)

init/builtins.cpp

+33 −0
Original line number Diff line number Diff line
@@ -292,6 +292,38 @@ static Result<void> do_export(const BuiltinArguments& args) { 
    return {};

}



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

    auto file_contents = ReadFile(args[1]);

    if (!file_contents.ok()) {

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

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

    }



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

    for (const auto& line : lines) {

        if (line.empty()) {

            continue;

        }



        auto env = Split(line, " ");



        if (env.size() != 3) {

            return ErrnoError() << "Expected a line as `export <name> <value>`, found: `" << line

                                << "`";

        }



        if (env[0] != "export") {

            return ErrnoError() << "Unknown action: '" << env[0] << "', expected 'export'";

        }



        if (setenv(env[1].c_str(), env[2].c_str(), 1) == -1) {

            return ErrnoError() << "Failed to export '" << line << "' from " << args[1];

        }

    }



    return {};

}



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

    if (auto result = WriteFile("/proc/sys/kernel/hostname", args[1]); !result.ok()) {

        return Error() << "Unable to write to /proc/sys/kernel/hostname: " << result.error();
@@ -1404,6 +1436,7 @@ const BuiltinFunctionMap& GetBuiltinFunctionMap() { 
        {"interface_restart",       {1,     1,    {false,  do_interface_restart}}},

        {"interface_start",         {1,     1,    {false,  do_interface_start}}},

        {"interface_stop",          {1,     1,    {false,  do_interface_stop}}},

        {"load_exports",            {1,     1,    {false,  do_load_exports}}},

        {"load_persist_props",      {0,     0,    {false,  do_load_persist_props}}},

        {"load_system_props",       {0,     0,    {false,  do_load_system_props}}},

        {"loglevel",                {1,     1,    {false,  do_loglevel}}},