[libvirt] [jenkins-ci PATCH v2 1/8] lcitool: Generate the unattended script file

[Fabiano Fidêncio]

Let's always generate the unattended script file as, by doing this, we
can treat the files we have as templates, being able to change them
accordingly to whatever is needed by specific distros.

It's important to note that we *must* be careful and keep generating
those files using their "expected" filename, preferably using the same
name of the template, as some of the distros require that.

Signed-off-by: Fabiano Fidêncio <fidencio at redhat.com>
Reviewed-by: Andrea Bolognani <abologna at redhat.com>
---
 guests/lcitool | 17 ++++++++++++++++-
 1 file changed, 16 insertions(+), 1 deletion(-)

diff --git a/guests/lcitool b/guests/lcitool
index 8436ce7..379fecc 100755
--- a/guests/lcitool
+++ b/guests/lcitool
@@ -23,9 +23,11 @@ import json
 import os
 import platform
 import random
+import shutil
 import string
 import subprocess
 import sys
+import tempfile
 import textwrap
 import yaml
 
@@ -537,7 +539,18 @@ class Application:
                 raise Exception(
                     "Host {} doesn't support installation".format(host)
                 )
-            initrd_inject = os.path.join(base, "configs", install_config)
+
+            # Unattended install scripts are being generated on the fly, based
+            # on the templates present in guests/configs/
+            initrd_template = os.path.join(base, "configs", install_config)
+            with open(initrd_template, 'r') as template:
+                content = template.read()
+
+                tempdir = tempfile.mkdtemp()
+                initrd_inject = os.path.join(tempdir, install_config)
+
+                with open(initrd_inject, "w") as inject:
+                    inject.write(content)
 
             # preseed files must use a well-known name to be picked up by
             # d-i; for kickstart files, we can use whatever name we please
@@ -587,6 +600,8 @@ class Application:
             except Exception as ex:
                 raise Exception("Failed to install '{}': {}".format(host, ex))
 
+            shutil.rmtree(tempdir, ignore_errors=True)
+
     def _action_update(self, args):
         self._execute_playbook("update", args.hosts, args.projects,
                                args.git_revision)
-- 
2.23.0