From f97da1f71700a3417953fa85bf1394307e5dd013 Mon Sep 17 00:00:00 2001
From: =?utf8?q?Alex=20Benn=C3=A9e?= <alex.bennee@linaro.org>
Date: Fri, 8 Jun 2018 16:20:48 +0100
Subject: [PATCH] docker: docker.py add check sub-command
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This command allows you to check if we need to re-build a docker
image. If the image isn't in the repository or the checksums don't
match then we return false and some text (for processing in
makefiles).

Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
---
 tests/docker/docker.py | 38 +++++++++++++++++++++++++++++++++++++-
 1 file changed, 37 insertions(+), 1 deletion(-)

diff --git a/tests/docker/docker.py b/tests/docker/docker.py
index 6a9f2f224b..e4f37820e0 100755
--- a/tests/docker/docker.py
+++ b/tests/docker/docker.py
@@ -184,8 +184,14 @@ class Docker(object):
                                        stderr=subprocess.STDOUT,
                                        **kwargs)
 
+    def inspect_tag(self, tag):
+        try:
+            return self._output(["inspect", tag])
+        except subprocess.CalledProcessError:
+            return None
+
     def get_image_dockerfile_checksum(self, tag):
-        resp = self._output(["inspect", tag])
+        resp = self.inspect_tag(tag)
         labels = json.loads(resp)[0]["Config"].get("Labels", {})
         return labels.get("com.qemu.dockerfile-checksum", "")
 
@@ -447,6 +453,36 @@ class CcCommand(SubCommand):
         return Docker().command("run", cmd, args.quiet)
 
 
+class CheckCommand(SubCommand):
+    """Check if we need to re-build a docker image out of a dockerfile.
+    Arguments: <tag> <dockerfile>"""
+    name = "check"
+
+    def args(self, parser):
+        parser.add_argument("tag",
+                            help="Image Tag")
+        parser.add_argument("dockerfile",
+                            help="Dockerfile name")
+
+    def run(self, args, argv):
+        dockerfile = open(args.dockerfile, "rb").read()
+        tag = args.tag
+
+        dkr = Docker()
+        info = dkr.inspect_tag(tag)
+        if info is None:
+            print("Image does not exist")
+            return 1
+
+        if dkr.image_matches_dockerfile(tag, dockerfile):
+            if not args.quiet:
+                print("Image is up to date")
+            return 0
+        else:
+            print("Image needs updating")
+            return 1
+
+
 def main():
     parser = argparse.ArgumentParser(description="A Docker helper",
             usage="%s <subcommand> ..." % os.path.basename(sys.argv[0]))
-- 
2.39.5