propagate undefined variable exception

dotdrop/action.py

@@ -11,6 +11,7 @@ import os
 
 # local imports
 from dotdrop.dictparser import DictParser
+from dotdrop.exceptions import UndefinedException
 
 
 class Cmd(DictParser):
@@ -32,7 +33,12 @@ class Cmd(DictParser):
         ret = 1
         action = self.action
         if templater:
-            action = templater.generate_string(self.action)
+            try:
+                action = templater.generate_string(self.action)
+            except UndefinedException as e:
+                err = 'bad {}: {}'.format(self.descr, e)
+                self.log.warn(err)
+                return False
             if debug:
                 self.log.dbg('{}:'.format(self.descr))
                 self.log.dbg('  - raw       \"{}\"'.format(self.action))
@@ -42,7 +48,12 @@ class Cmd(DictParser):
         if self.args:
             args = self.args
             if templater:
-                args = [templater.generate_string(a) for a in args]
+                try:
+                    args = [templater.generate_string(a) for a in args]
+                except UndefinedException as e:
+                    err = 'bad arguments for {}: {}'.format(self.descr, e)
+                    self.log.warn(err)
+                    return False
         if debug and args:
             self.log.dbg('action args:')
             for cnt, arg in enumerate(args):

dotdrop/cfg_aggregator.py

@@ -17,6 +17,7 @@ from dotdrop.profile import Profile
 from dotdrop.action import Action, Transform
 from dotdrop.logger import Logger
 from dotdrop.utils import strip_home
+from dotdrop.exceptions import UndefinedException
 
 
 TILD = '~'
@@ -281,7 +282,12 @@ class CfgAggregator:
         @src: dotfile src (in dotpath)
         @dst: dotfile dst (on filesystem)
         """
-        src = self.cfgyaml.resolve_dotfile_src(src)
+        try:
+            src = self.cfgyaml.resolve_dotfile_src(src)
+        except UndefinedException as e:
+            err = 'unable to resolve {}: {}'
+            self.log.err(err.format(src, e))
+            return None
         dotfiles = self.get_dotfile_by_dst(dst)
         for d in dotfiles:
             if d.src == src:

dotdrop/dotdrop.py

@@ -20,7 +20,7 @@ from dotdrop.comparator import Comparator
 from dotdrop.utils import get_tmpdir, remove, strip_home, \
     run, uniq_list, patch_ignores, dependencies_met
 from dotdrop.linktypes import LinkTypes
-from dotdrop.exceptions import YamlException
+from dotdrop.exceptions import YamlException, UndefinedException
 
 LOG = Logger()
 TRANS_SUFFIX = 'trans'
@@ -655,7 +655,10 @@ def main():
     try:
         o = Options()
     except YamlException as e:
-        LOG.err('config file error: {}'.format(str(e)))
+        LOG.err('config error: {}'.format(str(e)))
+        return False
+    except UndefinedException as e:
+        LOG.err('config error: {}'.format(str(e)))
         return False
 
     if o.debug:

dotdrop/exceptions.py

@@ -9,3 +9,8 @@ diverse exceptions
 class YamlException(Exception):
     """exception in CfgYaml"""
     pass
+
+
+class UndefinedException(Exception):
+    """exception in templating"""
+    pass

dotdrop/installer.py

@@ -12,6 +12,7 @@ import errno
 from dotdrop.logger import Logger
 from dotdrop.templategen import Templategen
 import dotdrop.utils as utils
+from dotdrop.exceptions import UndefinedException
 
 
 class Installer:
@@ -325,8 +326,12 @@ class Installer:
             err = 'dotfile points to itself: {}'.format(dst)
             return False, err
         saved = templater.add_tmp_vars(self._get_tmp_file_vars(src, dst))
-        content = templater.generate(src)
-        templater.restore_vars(saved)
+        try:
+            content = templater.generate(src)
+        except UndefinedException as e:
+            return False, e.message
+        finally:
+            templater.restore_vars(saved)
         if noempty and utils.content_empty(content):
             if self.debug:
                 self.log.dbg('ignoring empty template: {}'.format(src))

dotdrop/templategen.py

@@ -9,11 +9,14 @@ import os
 from jinja2 import Environment, FileSystemLoader, \
     ChoiceLoader, FunctionLoader, TemplateNotFound, \
     StrictUndefined
+from jinja2.exceptions import UndefinedError
+
 
 # local imports
 import dotdrop.utils as utils
 from dotdrop.logger import Logger
 import dotdrop.jhelpers as jhelpers
+from dotdrop.exceptions import UndefinedException
 
 BLOCK_START = '{%@@'
 BLOCK_END = '@@%}'
@@ -79,22 +82,28 @@ class Templategen:
     def generate(self, src):
         """
         render template from path
-        may raise a jinja2.exceptions.UndefinedError
+        may raise a UndefinedException
         in case a variable is undefined
         """
         if not os.path.exists(src):
             return ''
-        return self._handle_file(src)
+        try:
+            return self._handle_file(src)
+        except UndefinedError as e:
+            raise UndefinedException(e.message)
 
     def generate_string(self, string):
         """
         render template from string
-        may raise a jinja2.exceptions.UndefinedError
+        may raise a UndefinedException
         in case a variable is undefined
         """
         if not string:
             return ''
-        return self.env.from_string(string).render(self.variables)
+        try:
+            return self.env.from_string(string).render(self.variables)
+        except UndefinedError as e:
+            raise UndefinedException(e.message)
 
     def add_tmp_vars(self, newvars={}):
         """add vars to the globals, make sure to call restore_vars"""

dotdrop/updater.py

@@ -14,6 +14,7 @@ from dotdrop.logger import Logger
 from dotdrop.templategen import Templategen
 from dotdrop.utils import patch_ignores, remove, get_unique_tmp_name, \
     write_to_tmpfile, must_ignore, mirror_file_rights
+from dotdrop.exceptions import UndefinedException
 
 
 TILD = '~'
@@ -186,7 +187,11 @@ class Updater:
             if self.debug:
                 self.log.dbg('{} is a template'.format(dtpath))
             if self.showpatch:
-                self._show_patch(path, dtpath)
+                try:
+                    self._show_patch(path, dtpath)
+                except UndefinedException as e:
+                    msg = 'unable to show patch for {}: {}'.format(path, e)
+                    self.log.warn(msg)
             return False
         if compare and filecmp.cmp(path, dtpath, shallow=False) and \
                 self._same_rights(path, dtpath):