add executable option to bzr module, refactor in doing so

library/source_control/bzr

@@ -50,6 +50,13 @@ options:
         description:
             - If C(yes), any modified files in the working
               tree will be discarded.
+    executable:
+        required: false
+        default: null
+        version_added: "1.4"
+        description:
+            - Path to bzr executable to use. If not supplied,
+            the normal mechanism for resolving binary paths will be used.
 '''
 
 EXAMPLES = '''
@@ -58,67 +65,79 @@ EXAMPLES = '''
 '''
 
 import re
-import tempfile
 
-def get_version(dest):
+
+class Bzr(object):
+    def __init__(self, module, parent, dest, version, bzr_path):
+        self.module = module
+        self.parent = parent
+        self.dest = dest
+        self.version = version
+        self.bzr_path = bzr_path
+
+    def _command(self, args_list, **kwargs):
+        (rc, out, err) = self.module.run_command(
+            [self.bzr_path] + args_list, **kwargs)
+        return (rc, out, err)
+
+    def get_version(self):
         '''samples the version of the bzr branch'''
-    os.chdir(dest)
-    cmd = "bzr revno"
+        os.chdir(self.dest)
+        cmd = "%s revno" % self.bzr_path
         revno = os.popen(cmd).read().strip()
         return revno
 
-def clone(module, parent, dest, version):
+    def clone(self):
         '''makes a new bzr branch if it does not already exist'''
-    dest_dirname = os.path.dirname(dest)
+        dest_dirname = os.path.dirname(self.dest)
         try:
             os.makedirs(dest_dirname)
         except:
             pass
         os.chdir(dest_dirname)
-    if version.lower() != 'head':
-        cmd = "bzr branch -r %s %s %s" % (version, parent, dest)
+        if self.version.lower() != 'head':
+            args_list = ["branch", "-r", self.version, self.parent, self.dest]
         else:
-        cmd = "bzr branch %s %s" % (parent, dest)
-    return module.run_command(cmd, check_rc=True)
+            args_list = ["branch", self.parent, self.dest]
+        return self._command(args_list, check_rc=True)
 
-def has_local_mods(dest):
-    os.chdir(dest)
-    cmd = "bzr status -S"
+    def has_local_mods(self):
+        os.chdir(self.dest)
+        cmd = "%s status -S" % self.bzr_path
         lines = os.popen(cmd).read().splitlines()
         lines = filter(lambda c: not re.search('^\\?\\?.*$', c), lines)
         return len(lines) > 0
 
-def reset(module,dest,force):
+    def reset(self, force):
         '''
         Resets the index and working tree to head.
         Discards any changes to tracked files in the working
         tree since that commit.
         '''
-    os.chdir(dest)
-    if not force and has_local_mods(dest):
-        module.fail_json(msg="Local modifications exist in branch (force=no).")
-    return module.run_command("bzr revert", check_rc=True)
+        os.chdir(self.dest)
+        if not force and self.has_local_mods():
+            self.module.fail_json(msg="Local modifications exist in branch (force=no).")
+        return self._command(["revert"], check_rc=True)
 
-def fetch(module, dest, version):
+    def fetch(self):
         '''updates branch from remote sources'''
-    os.chdir(dest)
-    if version.lower() != 'head':
-        (rc, out, err) = module.run_command("bzr pull -r %s" % version)
+        os.chdir(self.dest)
+        if self.version.lower() != 'head':
+            (rc, out, err) = self._command(["pull", "-r", self.version])
         else:
-        (rc, out, err) = module.run_command("bzr pull")
+            (rc, out, err) = self._command(["pull"])
         if rc != 0:
-        module.fail_json(msg="Failed to pull")
+            self.module.fail_json(msg="Failed to pull")
         return (rc, out, err)
 
-def switch_version(module, dest, version):
+    def switch_version(self):
         '''once pulled, switch to a particular revno or revid'''
-    os.chdir(dest)
-    cmd = ''
-    if version.lower() != 'head':
-        cmd = "bzr revert -r %s" % version
+        os.chdir(self.dest)
+        if self.version.lower() != 'head':
+            args_list = ["revert", "-r", self.version]
         else:
-        cmd = "bzr revert"
-    return module.run_command(cmd, check_rc=True)
+            args_list = ["revert"]
+        return self._command(args_list, check_rc=True)
 
 # ===========================================
 
@@ -128,7 +147,8 @@ def main():
             dest=dict(required=True),
             name=dict(required=True, aliases=['parent']),
             version=dict(default='head'),
-            force=dict(default='yes', type='bool')
+            force=dict(default='yes', type='bool'),
+            executable=dict(default=None),
         )
     )
 
@@ -136,34 +156,38 @@ def main():
     parent  = module.params['name']
     version = module.params['version']
     force   = module.params['force']
+    bzr_path = module.params['executable'] or module.get_bin_path('bzr', True)
 
     bzrconfig = os.path.join(dest, '.bzr', 'branch', 'branch.conf')
 
     rc, out, err, status = (0, None, None, None)
 
+    bzr = Bzr(module, parent, dest, version, bzr_path)
+
     # if there is no bzr configuration, do a branch operation
     # else pull and switch the version
     before = None
     local_mods = False
     if not os.path.exists(bzrconfig):
-        (rc, out, err) = clone(module, parent, dest, version)
+        (rc, out, err) = bzr.clone()
+
     else:
         # else do a pull
-        local_mods = has_local_mods(dest)
-        before = get_version(dest)
-        (rc, out, err) = reset(module, dest, force)
+        local_mods = bzr.has_local_mods()
+        before = bzr.get_version()
+        (rc, out, err) = bzr.reset(force)
         if rc != 0:
             module.fail_json(msg=err)
-        (rc, out, err) = fetch(module, dest, version)
+        (rc, out, err) = bzr.fetch()
         if rc != 0:
             module.fail_json(msg=err)
 
     # switch to version specified regardless of whether
     # we cloned or pulled
-    (rc, out, err) = switch_version(module, dest, version)
+    (rc, out, err) = bzr.switch_version()
 
     # determine if we changed anything
-    after = get_version(dest)
+    after = bzr.get_version()
     changed = False
 
     if before != after or local_mods: