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require 'spec_helper'
describe 'Gitlab::Git::Popen' do
let(:path) { Rails.root.join('tmp').to_s }
let(:test_string) { 'The quick brown fox jumped over the lazy dog' }
# The pipe buffer is typically 64K. This string is about 440K.
let(:spew_command) { ['bash', '-c', "for i in {1..10000}; do echo '#{test_string}' 1>&2; done"] }
let(:klass) do
Class.new(Object) do
include Gitlab::Git::Popen
end
end
context 'popen' do
context 'zero status' do
let(:result) { klass.new.popen(%w(ls), path) }
let(:output) { result.first }
let(:status) { result.last }
it { expect(status).to be_zero }
it { expect(output).to include('tests') }
end
context 'non-zero status' do
let(:result) { klass.new.popen(%w(cat NOTHING), path) }
let(:output) { result.first }
let(:status) { result.last }
it { expect(status).to eq(1) }
it { expect(output).to include('No such file or directory') }
end
context 'unsafe string command' do
it 'raises an error when it gets called with a string argument' do
expect { klass.new.popen('ls', path) }.to raise_error(RuntimeError)
end
end
context 'with custom options' do
let(:vars) { { 'foobar' => 123, 'PWD' => path } }
let(:options) { { chdir: path } }
it 'calls popen3 with the provided environment variables' do
expect(Open3).to receive(:popen3).with(vars, 'ls', options)
klass.new.popen(%w(ls), path, { 'foobar' => 123 })
end
end
context 'use stdin' do
let(:result) { klass.new.popen(%w[cat], path) { |stdin| stdin.write 'hello' } }
let(:output) { result.first }
let(:status) { result.last }
it { expect(status).to be_zero }
it { expect(output).to eq('hello') }
end
context 'with lazy block' do
it 'yields a lazy io' do
expect_lazy_io = lambda do |io|
expect(io).to be_a Enumerator::Lazy
expect(io.inspect).to include('#<IO:fd')
end
klass.new.popen(%w[ls], path, lazy_block: expect_lazy_io)
end
it "doesn't wait for process exit" do
Timeout.timeout(2) do
klass.new.popen(%w[yes], path, lazy_block: ->(io) {})
end
end
end
context 'with a process that writes a lot of data to stderr' do
it 'returns zero' do
output, status = klass.new.popen(spew_command, path)
expect(output).to include(test_string)
expect(status).to eq(0)
end
end
end
context 'popen_with_timeout' do
let(:timeout) { 1.second }
context 'no timeout' do
context 'zero status' do
let(:result) { klass.new.popen_with_timeout(%w(ls), timeout, path) }
let(:output) { result.first }
let(:status) { result.last }
it { expect(status).to be_zero }
it { expect(output).to include('tests') }
end
context 'multi-line string' do
let(:test_string) { "this is 1 line\n2nd line\n3rd line\n" }
let(:result) { klass.new.popen_with_timeout(['echo', test_string], timeout, path) }
let(:output) { result.first }
let(:status) { result.last }
it { expect(status).to be_zero }
# echo adds its own line
it { expect(output).to eq(test_string + "\n") }
end
context 'non-zero status' do
let(:result) { klass.new.popen_with_timeout(%w(cat NOTHING), timeout, path) }
let(:output) { result.first }
let(:status) { result.last }
it { expect(status).to eq(1) }
it { expect(output).to include('No such file or directory') }
end
context 'unsafe string command' do
it 'raises an error when it gets called with a string argument' do
expect { klass.new.popen_with_timeout('ls', timeout, path) }.to raise_error(RuntimeError)
end
end
end
context 'timeout' do
context 'timeout' do
it "raises a Timeout::Error" do
expect { klass.new.popen_with_timeout(%w(sleep 1000), timeout, path) }.to raise_error(Timeout::Error)
end
it "handles processes that do not shutdown correctly" do
expect { klass.new.popen_with_timeout(['bash', '-c', "trap -- '' SIGTERM; sleep 1000"], timeout, path) }.to raise_error(Timeout::Error)
end
it 'handles process that writes a lot of data to stderr' do
output, status = klass.new.popen_with_timeout(spew_command, timeout, path)
expect(output).to include(test_string)
expect(status).to eq(0)
end
end
context 'timeout period' do
let(:time_taken) do
begin
start = Time.now
klass.new.popen_with_timeout(%w(sleep 1000), timeout, path)
rescue
Time.now - start
end
end
it { expect(time_taken).to be >= timeout }
end
context 'clean up' do
let(:instance) { klass.new }
it 'kills the child process' do
expect(instance).to receive(:kill_process_group_for_pid).and_wrap_original do |m, *args|
# is the PID, and it should not be running at this point
m.call(*args)
pid = args.first
begin
Process.getpgid(pid)
raise "The child process should have been killed"
rescue Errno::ESRCH
end
end
expect { instance.popen_with_timeout(['bash', '-c', "trap -- '' SIGTERM; sleep 1000"], timeout, path) }.to raise_error(Timeout::Error)
end
end
end
end
end
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