1 | module main |
2 | |
3 | import os |
4 | |
5 | // a test where we execute a bash script but work around where we put script in bash inside bash |
6 | |
7 | fn exec(path string, redirect bool) { |
8 | mut line := '' |
9 | mut line_err := '' |
10 | mut cmd := os.new_process('/bin/bash') |
11 | |
12 | if redirect { |
13 | cmd.set_args(['-c', '/bin/bash /tmp/test.sh 2>&1']) |
14 | } else { |
15 | cmd.set_args([path]) |
16 | } |
17 | |
18 | cmd.set_redirect_stdio() |
19 | cmd.run() |
20 | for cmd.is_alive() { |
21 | line = cmd.stdout_read() |
22 | println('STDOUT: ${line}') |
23 | |
24 | if !redirect { |
25 | line_err = cmd.stderr_read() |
26 | println('STDERR: ${line_err}') |
27 | } |
28 | } |
29 | if cmd.code > 0 { |
30 | println('ERROR:') |
31 | println(cmd) |
32 | // println(cmd.stderr_read()) |
33 | } |
34 | } |
35 | |
36 | fn main() { |
37 | script := ' |
38 | echo line 1 |
39 | #will use some stderr now |
40 | echo redirect 1 to 2 1>&2 |
41 | echo line 3 |
42 | ' |
43 | |
44 | os.write_file('/tmp/test.sh', script) or { panic(err) } |
45 | // os.chmod("/tmp/test.sh",0o700) //make executable |
46 | |
47 | // this will work because stderr/stdout are smaller than 4096 chars, once larger there can be deadlocks |
48 | // in other words this can never work reliably without being able to check if there is data on stderr or stdout |
49 | exec('/tmp/test.sh', false) |
50 | |
51 | // this will always work |
52 | exec('/tmp/test.sh', true) |
53 | } |