From 1ae410d19e0ead7db89192b3d0e290a677314d6e Mon Sep 17 00:00:00 2001
From: Matthew Heon <mheon@redhat.com>
Date: Tue, 19 Jan 2021 13:41:50 -0500
Subject: [PATCH] Ensure the Volumes field in Compat Create is honored

Docker has, for unclear reasons, three separate fields in their
Create Container struct in which volumes can be placed. Right now
we support two of those - Binds and Mounts, which (roughly)
correspond to `-v` and `--mount` respectively. Unfortunately, we
did not support the third, `Volumes`, which is used for anonymous
named volumes created by `-v` (e.g. `-v /test`). It seems that
volumes listed here are *not* included in the remaining two from
my investigation, so it should be safe to just append them into
our handling of the `Binds` (`-v`) field.

Fixes #8649

Signed-off-by: Matthew Heon <mheon@redhat.com>
---
 cmd/podman/common/create_opts.go | 26 ++++++++++++++++++++++++--
 test/apiv2/20-containers.at      |  9 +++++++++
 2 files changed, 33 insertions(+), 2 deletions(-)

diff --git a/cmd/podman/common/create_opts.go b/cmd/podman/common/create_opts.go
index a4da8da9ef..d86a6d3648 100644
--- a/cmd/podman/common/create_opts.go
+++ b/cmd/podman/common/create_opts.go
@@ -3,6 +3,7 @@ package common
 import (
 	"fmt"
 	"net"
+	"path/filepath"
 	"strconv"
 	"strings"
 
@@ -383,8 +384,29 @@ func ContainerCreateToContainerCLIOpts(cc handlers.CreateContainerConfig, cgroup
 	}
 
 	// volumes
-	if volumes := cc.HostConfig.Binds; len(volumes) > 0 {
-		cliOpts.Volume = volumes
+	volDestinations := make(map[string]bool)
+	for _, vol := range cc.HostConfig.Binds {
+		cliOpts.Volume = append(cliOpts.Volume, vol)
+		// Extract the destination so we don't add duplicate mounts in
+		// the volumes phase.
+		splitVol := strings.SplitN(vol, ":", 3)
+		switch len(splitVol) {
+		case 1:
+			volDestinations[vol] = true
+		default:
+			volDestinations[splitVol[1]] = true
+		}
+	}
+	// Anonymous volumes are added differently from other volumes, in their
+	// own special field, for reasons known only to Docker. Still use the
+	// format of `-v` so we can just append them in there.
+	// Unfortunately, these may be duplicates of existing mounts in Binds.
+	// So... We need to catch that.
+	for vol := range cc.Volumes {
+		if _, ok := volDestinations[filepath.Clean(vol)]; ok {
+			continue
+		}
+		cliOpts.Volume = append(cliOpts.Volume, vol)
 	}
 	if len(cc.HostConfig.BlkioWeightDevice) > 0 {
 		devices := make([]string, 0, len(cc.HostConfig.BlkioWeightDevice))
diff --git a/test/apiv2/20-containers.at b/test/apiv2/20-containers.at
index decdc4754d..0da196e46f 100644
--- a/test/apiv2/20-containers.at
+++ b/test/apiv2/20-containers.at
@@ -237,3 +237,12 @@ t GET containers/$cid/json 200 \
 t DELETE containers/$cid 204
 t DELETE images/${MultiTagName}?force=true 200
 # vim: filetype=sh
+
+# Test Volumes field adds an anonymous volume
+t POST containers/create '"Image":"'$IMAGE'","Volumes":{"/test":{}}' 201 \
+  .Id~[0-9a-f]\\{64\\}
+cid=$(jq -r '.Id' <<<"$output")
+t GET containers/$cid/json 200 \
+  .Mounts[0].Destination="/test"
+
+t DELETE containers/$cid?v=true 204