From 53d22c779c5d2df5ccda5a8e23db0501a0dadf44 Mon Sep 17 00:00:00 2001
From: Matthew Heon <matthew.heon@pm.me>
Date: Wed, 3 Mar 2021 15:30:52 -0500
Subject: [PATCH] Compat API: create volume source dirs on the host
It took a lot to figure out exactly how this should work, but I
think I finally have it. My initial versions of this created the
directory with the same owner as the user the container was run
with, which was rather complicated - but after review against
Docker, I have determined that is incorrect, and it's always made
as root:root 0755 (Ubuntu's Docker, which I was using to try and
test, is a snap - and as such it was sandboxed, and not actually
placing directories it made in a place I could find?). This makes
things much easier, since I just need to parse out source
directories for binds and ensure they exist.
Fixes #9510
Signed-off-by: Matthew Heon <matthew.heon@pm.me>
---
cmd/podman/common/create_opts.go | 17 +++++++++++++++++
test/apiv2/44-mounts.at | 2 +-
2 files changed, 18 insertions(+), 1 deletion(-)
diff --git a/cmd/podman/common/create_opts.go b/cmd/podman/common/create_opts.go
index f945c9c54a..03cd8a7213 100644
--- a/cmd/podman/common/create_opts.go
+++ b/cmd/podman/common/create_opts.go
@@ -3,6 +3,7 @@ package common
import (
"fmt"
"net"
+ "os"
"path/filepath"
"strconv"
"strings"
@@ -13,6 +14,7 @@ import (
"github.com/containers/podman/v3/pkg/domain/entities"
"github.com/containers/podman/v3/pkg/rootless"
"github.com/containers/podman/v3/pkg/specgen"
+ "github.com/pkg/errors"
)
type ContainerCLIOpts struct {
@@ -397,6 +399,7 @@ func ContainerCreateToContainerCLIOpts(cc handlers.CreateContainerConfig, cgroup
}
// volumes
+ volSources := make(map[string]bool)
volDestinations := make(map[string]bool)
for _, vol := range cc.HostConfig.Binds {
cliOpts.Volume = append(cliOpts.Volume, vol)
@@ -407,6 +410,7 @@ func ContainerCreateToContainerCLIOpts(cc handlers.CreateContainerConfig, cgroup
case 1:
volDestinations[vol] = true
default:
+ volSources[splitVol[0]] = true
volDestinations[splitVol[1]] = true
}
}
@@ -421,6 +425,19 @@ func ContainerCreateToContainerCLIOpts(cc handlers.CreateContainerConfig, cgroup
}
cliOpts.Volume = append(cliOpts.Volume, vol)
}
+ // Make mount points for compat volumes
+ for vol := range volSources {
+ // This might be a named volume.
+ // Assume it is if it's not an absolute path.
+ if !filepath.IsAbs(vol) {
+ continue
+ }
+ if err := os.MkdirAll(vol, 0755); err != nil {
+ if !os.IsExist(err) {
+ return nil, nil, errors.Wrapf(err, "error making volume mountpoint for volume %s", vol)
+ }
+ }
+ }
if len(cc.HostConfig.BlkioWeightDevice) > 0 {
devices := make([]string, 0, len(cc.HostConfig.BlkioWeightDevice))
for _, d := range cc.HostConfig.BlkioWeightDevice {
diff --git a/test/apiv2/44-mounts.at b/test/apiv2/44-mounts.at
index fe202576d4..5dc560852e 100644
--- a/test/apiv2/44-mounts.at
+++ b/test/apiv2/44-mounts.at
@@ -4,7 +4,7 @@ podman pull $IMAGE &>/dev/null
# Test various HostConfig options
tmpfs_name="/mytmpfs"
-t POST containers/create?name=hostconfig_test '"Image":"'$IMAGE'","Cmd":["df"],"HostConfig":{"TmpFs":{"'$tmpfs_name'":"rw"}}' 201 \
+t POST containers/create?name=hostconfig_test '"Image":"'$IMAGE'","Cmd":["df"],"HostConfig":{"Binds":["/tmp/doesnotexist:/test1"],"TmpFs":{"'$tmpfs_name'":"rw"}}' 201 \
.Id~[0-9a-f]\\{64\\}
cid=$(jq -r '.Id' <<<"$output")