File save-log-to-logfile-with-docker.build.patch of Package salt.29649

From 88adb2f59137213119f1da2b6dbf6fce859fc12f Mon Sep 17 00:00:00 2001
From: Vladimir Nadvornik <nadvornik@suse.cz>
Date: Mon, 27 Jun 2022 17:00:58 +0200
Subject: [PATCH] Save log to logfile with docker.build

---
 salt/modules/dockermod.py | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/salt/modules/dockermod.py b/salt/modules/dockermod.py
index 8b6ab8058e..f7344b66ac 100644
--- a/salt/modules/dockermod.py
+++ b/salt/modules/dockermod.py
@@ -4006,6 +4006,7 @@ def build(
     fileobj=None,
     dockerfile=None,
     buildargs=None,
+    logfile=None,
 ):
     """
     .. versionchanged:: 2018.3.0
@@ -4059,6 +4060,9 @@ def build(
     buildargs
         A dictionary of build arguments provided to the docker build process.
 
+    logfile
+        Path to log file. Output from build is written to this file if not None.
+
 
     **RETURN DATA**
 
@@ -4133,6 +4137,20 @@ def build(
     stream_data = []
     for line in response:
         stream_data.extend(salt.utils.json.loads(line, cls=DockerJSONDecoder))
+
+    if logfile:
+        try:
+            with salt.utils.files.fopen(logfile, "a") as f:
+                for item in stream_data:
+                    try:
+                        item_type = next(iter(item))
+                    except StopIteration:
+                        continue
+                    if item_type == "stream":
+                        f.write(item[item_type])
+        except OSError:
+            log.error("Unable to write logfile '%s'", logfile)
+
     errors = []
     # Iterate through API response and collect information
     for item in stream_data:
-- 
2.39.2