Add support for external container

External containers are containers created outside of Podman.
For example Buildah and CRI-O Containers.

$ buildah from alpine
alpine-working-container
$ buildah run alpine-working-container touch /test
$ podman container exists --external alpine-working-container

$ podman container diff alpine-working-container
C /etc
A /test

Added --external flag to refer to external containers, rather then --storage.

Added --external for podman container exists and modified podman ps to use
--external rather then --storage.  It was felt that --storage would confuse
the user into thinking about changing the storage driver or options.

--storage is still supported through the use of aliases.

Finally podman contianer diff, does not require the --external flag, since it
there is little change of users making the mistake, and would just be a pain
for the user to remember the flag.

podman container exists --external is required because it could fool scripts
that rely on the existance of a Podman container, and there is a potential
for a partial deletion of a container, which could mess up existing users.

Signed-off-by: Daniel J Walsh <dwalsh@redhat.com>

1 files changed, 4 insertions, 1 deletions

diff --git a/test/system/030-run.bats b/test/system/030-run.bats
index a82743c70..f7c48da8d 100644
--- a/test/system/030-run.bats
+++ b/test/system/030-run.bats
@@ -471,8 +471,11 @@ json-file | f
     run buildah from $IMAGE
     cid="$output"
 
+    # exists should fail
+    run_podman 1 container exists $cid
+
     # exists should succeed
-    run_podman container exists $cid
+    run_podman container exists --external $cid
 
     run buildah rm $cid
 }