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Xiaohe Cao
slapos
Commits
15642ba1
Commit
15642ba1
authored
Aug 29, 2013
by
Cédric de Saint Martin
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librecipe: add pidfile option for singletons.
parent
5afd81f9
Changes
1
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1 changed file
with
21 additions
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1 deletion
+21
-1
slapos/recipe/librecipe/generic.py
slapos/recipe/librecipe/generic.py
+21
-1
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slapos/recipe/librecipe/generic.py
View file @
15642ba1
...
@@ -33,6 +33,7 @@ import sys
...
@@ -33,6 +33,7 @@ import sys
import
inspect
import
inspect
import
re
import
re
import
shutil
import
shutil
from
textwrap
import
dedent
import
urllib
import
urllib
import
urlparse
import
urlparse
...
@@ -129,10 +130,14 @@ class GenericBaseRecipe(object):
...
@@ -129,10 +130,14 @@ class GenericBaseRecipe(object):
return
script
return
script
def
createWrapper
(
self
,
name
,
command
,
parameters
,
comments
=
[],
def
createWrapper
(
self
,
name
,
command
,
parameters
,
comments
=
[],
parameters_extra
=
False
,
environment
=
None
):
parameters_extra
=
False
,
environment
=
None
,
pidfile
=
None
):
"""
"""
Creates a very simple (one command) shell script for process replacement.
Creates a very simple (one command) shell script for process replacement.
Takes care of quoting.
Takes care of quoting.
if pidfile parameter is specified, then it will make the wrapper a singleton,
accepting to run only if no other instance is running.
"""
"""
lines
=
[
'#!/bin/sh'
]
lines
=
[
'#!/bin/sh'
]
...
@@ -144,6 +149,21 @@ class GenericBaseRecipe(object):
...
@@ -144,6 +149,21 @@ class GenericBaseRecipe(object):
for
key
in
environment
:
for
key
in
environment
:
lines
.
append
(
'export %s=%s'
%
(
key
,
environment
[
key
]))
lines
.
append
(
'export %s=%s'
%
(
key
,
environment
[
key
]))
if
pidfile
:
lines
.
append
(
dedent
(
"""
\
# Check for other instances
pidfile=%s
if [ -e $pidfile ]; then
pid=$(cat $pidfile)
if [[ ! -z $(ps -p "$pid" | grep $(basename %s)) ]]; then
echo "Already running with pid $pid."
exit 1
else
rm $pidfile
fi
fi
echo $$ > $pidfile"""
%
(
pidfile
,
command
)))
lines
.
append
(
'exec %s'
%
shlex
.
quote
(
command
))
lines
.
append
(
'exec %s'
%
shlex
.
quote
(
command
))
for
param
in
parameters
:
for
param
in
parameters
:
...
...
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