The Meson Build System
http://mesonbuild.com/
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
42 lines
1.5 KiB
42 lines
1.5 KiB
--- |
|
short-description: Running external commands |
|
... |
|
|
|
# External commands |
|
|
|
As a part of the software configuration, you may want to get extra |
|
data by running external commands. The basic syntax is the following. |
|
|
|
```meson |
|
r = run_command('command', 'arg1', 'arg2', 'arg3') |
|
if r.returncode() != 0 |
|
# it failed |
|
endif |
|
output = r.stdout().strip() |
|
errortxt = r.stderr().strip() |
|
``` |
|
|
|
Additionally, since 0.50.0, you can pass the command [`environment`](Reference-manual.html#environment-object) object: |
|
|
|
```meson |
|
env = environment() |
|
env.set('FOO', 'bar') |
|
run_command('command', 'arg1', 'arg2', env: env) |
|
``` |
|
|
|
The `run_command` function returns an object that can be queried for |
|
return value and text written to stdout and stderr. The `strip` method |
|
call is used to strip trailing and leading whitespace from |
|
strings. Usually output from command line programs ends in a newline, |
|
which is unwanted in string variables. The first argument can be |
|
either a string or an executable you have detected earlier with |
|
`find_program`. |
|
|
|
Note that you can not pass your command line as a single string. That |
|
is, calling `run_command('do_something foo bar')` will not work. You |
|
must either split up the string into separate arguments or pass the |
|
split command as an array. It should also be noted that Meson will not |
|
pass the command to the shell, so any command lines that try to use |
|
things such as environment variables, backticks or pipelines will not |
|
work. If you require shell semantics, write your command into a script |
|
file and call that with `run_command`.
|
|
|