Commit 6b82838e authored by Roque's avatar Roque

Automatic restart of services when configuration changes

The main idea is to rename the service wrapper using a hash of the corresponding configuration files. In that way, if the config files are updated, the corresponding script file, section in supervisor.conf and service process will be updated accordingly.
- the file name in wrapper_path contains a hash of the corresponding config files
- when config files change, and therefore the hash, the wrapper will be re-created and the corresponding service restarted
- the config files paths will be a parameter in the corresponding buildout section, if it isn't set there won't be hash-check

/reviewed-on nexedi/slapos!326
parent 00bd65a8
......@@ -36,6 +36,7 @@ class Recipe(GenericBaseRecipe):
:param str wrapper-path: absolute path to file's destination
:param lines wait-for-files: list of files to wait for
:param lines hash-files: list of files to be checked by hash
:param str pidfile: path to pidfile ensure exclusivity for the process
:param str private-dev-shm: size of private /dev/shm, using user namespaces
:param bool reserve-cpu: command will ask for an exclusive CPU core
......@@ -44,6 +45,7 @@ class Recipe(GenericBaseRecipe):
args = shlex.split(self.options['command-line'])
wrapper_path = self.options['wrapper-path']
wait_files = self.options.get('wait-for-files')
hash_files = self.options.get('hash-files')
pidfile = self.options.get('pidfile')
private_dev_shm = self.options.get('private-dev-shm')
......@@ -63,5 +65,20 @@ class Recipe(GenericBaseRecipe):
kw['private_dev_shm'] = private_dev_shm
if self.isTrueValue(self.options.get('reserve-cpu')):
kw['reserve_cpu'] = True
if hash_files:
hash_file_list = hash_files.split()
hash = self.generateHashFromFiles(hash_file_list)
wrapper_path = "%s-%s" % (wrapper_path, hash)
return self.createWrapper(wrapper_path, args, environment, **kw)
def generateHashFromFiles(self, file_list):
import hashlib
hasher = hashlib.md5()
for path in file_list:
with open(path, 'r') as afile:
buf = afile.read()
hasher.update("%s\n" % len(buf))
hasher.update(buf)
hash = hasher.hexdigest()
return hash
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