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Compat API: create volume source dirs on the host

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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>
This commit is contained in:
Matthew Heon
2021-03-03 15:30:52 -05:00
parent 87e20560ac
commit 53d22c779c
2 changed files with 18 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files

17
cmd/podman/common/create_opts.go
View File

@ -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 {

2
test/apiv2/44-mounts.at
View File

@ -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")