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init: add a copy_per_line built-in command

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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
This commit is contained in:
Wei Wang 2020-11-18 15:56:14 -08:00
parent 48c35f0cf6
commit 49d2598166
2 changed files with 23 additions and 0 deletions
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4
init/README.md
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@ -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.

19
init/builtins.cpp
View file

@ -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}}},