mirror always fails with "ListBucketPolicies is not supported for filesystem"

[coffee-squirrel]

Expected behavior

mc mirror does not attempt to copy bucket policies unless --preserve or -a is specified, allowing the command to complete successfully when MinIO Server is of the filesystem type.

Actual behavior

The mc mirror command (e.g. mc mirror --overwrite --remove files/ "blobstore/my-bucket/some/path/") fails with an error like:

mc: <ERROR> Unable to copy bucket policies to `https://mydomain:8443/my-bucket/some/path/`. `ListBucketPolicies` is not supported for `filesystem`.

It looks like #2965 (specifically: https:/minio/mc/pull/2965/files#diff-037c805435914444292ac1b753a92529R743) changed the behavior of mc mirror, making it so that copying bucket policies is always attempted rather than being conditional upon --preserve / -a. The filesystem client doesn't support GetAccessRules, however.

Steps to reproduce the behavior

1. Have a standalone/filesystem MinIO Server instance
2. Attempt to mc mirror some content to the MinIO Server instance
3. Note the aforementioned error

mc version

Version: 2019-12-17T23:26:28Z
Release-tag: RELEASE.2019-12-17T23-26-28Z
Commit-id: d92d2f0d4f1c21236cecf5a305bd6679b9527f66

System information

• Standalone Minio Server instance
• Server OS: Windows Server 2016
• MinIO Server version:

Version: 2019-10-12T01:39:57Z
Release-Tag: RELEASE.2019-10-12T01-39-57Z
Commit-ID: bd106408462ecef70debf51f1e6179de950c5812

[harshavardhana]

It doesn't fail it is just a warning and it continues @coffee-squirrel

[coffee-squirrel]

@harshavardhana Sorry, you're completely right. The content I was looking at was already in sync, so I misunderstood what was happening. It is a bit odd to see an error, though. I'll go ahead and close this out.

[harshavardhana]

Warning to be removed in PR #3018