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Kernel: Support passing arguments in shebangged scripts

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Add the ability to both pass arguments to scripts with shebangs
(./script argument1 argument2) and to specify them in the shebang line
(#!/usr/local/bin/bash -x -e)

Fixes #585
This commit is contained in:
Karol Baraniecki 2019-10-27 10:42:07 +01:00 committed by Andreas Kling
parent e2c74762ff
commit 9131134704
Notes: sideshowbarker 2024-07-19 11:30:56 +09:00 
Author: https://github.com/karolba 🔰
Commit: https://github.com/SerenityOS/serenity/commit/9131134704d
Pull-request: https://github.com/SerenityOS/serenity/pull/692
2 changed files with 34 additions and 8 deletions
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40
Kernel/Process.cpp
View File

@ -550,7 +550,7 @@ int Process::do_exec(String path, Vector<String> arguments, Vector<String> envir
return 0;
}
KResultOr<String> Process::find_shebang_interpreter_for_executable(const String& executable_path)
KResultOr<Vector<String>> Process::find_shebang_interpreter_for_executable(const String& executable_path)
{
// FIXME: It's a bit sad that we'll open the executable twice (in case there's no shebang)
// Maybe we can find a way to plumb this opened FileDescription to the rest of the
@ -569,16 +569,34 @@ KResultOr<String> Process::find_shebang_interpreter_for_executable(const String&
char first_page[PAGE_SIZE];
int nread = description->read((u8*)&first_page, sizeof(first_page));
int interpreter_length = 0;
int word_start = 2;
int word_length = 0;
if (nread > 2 && first_page[0] == '#' && first_page[1] == '!') {
Vector<String> interpreter_words;
for (int i = 2; i < nread; ++i) {
if (first_page[i] == '\n') {
interpreter_length = i - 2;
break;
}
if (first_page[i] != ' ') {
++word_length;
}
if (first_page[i] == ' ') {
if (word_length > 0) {
interpreter_words.append(String(&first_page[word_start], word_length));
}
word_length = 0;
word_start = i + 1;
}
}
if (interpreter_length > 0)
return String(&first_page[2], interpreter_length);
if (word_length > 0)
interpreter_words.append(String(&first_page[word_start], word_length));
if (!interpreter_words.is_empty())
return interpreter_words;
}
return KResult(-ENOEXEC);
@ -587,8 +605,16 @@ KResultOr<String> Process::find_shebang_interpreter_for_executable(const String&
int Process::exec(String path, Vector<String> arguments, Vector<String> environment)
{
auto result = find_shebang_interpreter_for_executable(path);
if (!result.is_error())
return exec(result.value(), { result.value(), path }, move(environment));
if (!result.is_error()) {
Vector<String> new_arguments(result.value());
new_arguments.append(path);
arguments.remove(0);
new_arguments.append(move(arguments));
return exec(result.value().first(), move(new_arguments), move(environment));
}
// The bulk of exec() is done by do_exec(), which ensures that all locals
// are cleaned up by the time we yield-teleport below.

2
Kernel/Process.h
View File

@ -318,7 +318,7 @@ private:
int alloc_fd(int first_candidate_fd = 0);
void disown_all_shared_buffers();
KResultOr<String> find_shebang_interpreter_for_executable(const String& executable_path);
KResultOr<Vector<String>> find_shebang_interpreter_for_executable(const String& executable_path);
Thread* m_main_thread { nullptr };