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Improve parsing of 'systemctl show' output

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Colin Chan 2017-02-22 22:41:38 -08:00 • committed by Brian Coca
commit 2d9d1762ba
2 changed files with 86 additions and 20 deletions
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55
lib/ansible/modules/system/systemd.py
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@ -259,6 +259,40 @@ def is_running_service(service_status):
def request_was_ignored(out):
return '=' not in out and 'ignoring request' in out
def parse_systemctl_show(lines):
# The output of 'systemctl show' can contain values that span multiple lines. At first glance it
# appears that such values are always surrounded by {}, so the previous version of this code
# assumed that any value starting with { was a multi-line value; it would then consume lines
# until it saw a line that ended with }. However, it is possible to have a single-line value
# that starts with { but does not end with } (this could happen in the value for Description=,
# for example), and the previous version of this code would then consume all remaining lines as
# part of that value. Cryptically, this would lead to Ansible reporting that the service file
# couldn't be found.
#
# To avoid this issue, the following code only accepts multi-line values for keys whose names
# start with Exec (e.g., ExecStart=), since these are the only keys whose values are known to
# span multiple lines.
parsed = {}
multival = []
k = None
for line in lines:
if k is None:
if '=' in line:
k, v = line.split('=', 1)
if k.startswith('Exec') and v.lstrip().startswith('{'):
if not v.rstrip().endswith('}'):
multival.append(v)
continue
parsed[k] = v.strip()
k = None
else:
multival.append(line)
if line.rstrip().endswith('}'):
parsed[k] = '\n'.join(multival).strip()
multival = []
k = None
return parsed
# ===========================================
# Main control flow
@ -320,27 +354,8 @@ def main():
elif rc == 0:
# load return of systemctl show into dictionary for easy access and return
multival = []
if out:
k = None
for line in to_native(out).split('\n'): # systemd can have multiline values delimited with {}
if line.strip():
if k is None:
if '=' in line:
k,v = line.split('=', 1)
if v.lstrip().startswith('{'):
if not v.rstrip().endswith('}'):
multival.append(line)
continue
result['status'][k] = v.strip()
k = None
else:
if line.rstrip().endswith('}'):
result['status'][k] = '\n'.join(multival).strip()
multival = []
k = None
else:
multival.append(line)
result['status'] = parse_systemctl_show(to_native(out).split('\n'))
is_systemd = 'LoadState' in result['status'] and result['status']['LoadState'] != 'not-found'