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.
53 lines
1.8 KiB
53 lines
1.8 KiB
5 years ago
|
---
|
||
|
|
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()
|
||
|
|
```
|
||
|
|
|
||
|
|
Since 0.52.0, you can pass the command environment as a dictionary:
|
||
|
|
|
||
|
|
```meson
|
||
|
|
run_command('command', 'arg1', 'arg2', env: {'FOO': 'bar'})
|
||
|
|
```
|
||
|
|
|
||
|
|
Since 0.50.0, you can also pass the command
|
||
|
|
[`environment`](Reference-manual.md#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`.
|
||
|
|
|
||
|
|
Meson will autodetect scripts with a shebang line and run them with
|
||
|
|
the executable/interpreter specified in it both on Windows and on Unixes.
|
||
|
|
|
||
|
|
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`.
|