diff options
| -rw-r--r-- | docs/source/markdown/podman-machine-init.1.md | 24 | ||||
| -rw-r--r-- | pkg/machine/qemu/machine.go | 11 |
2 files changed, 28 insertions, 7 deletions
diff --git a/docs/source/markdown/podman-machine-init.1.md b/docs/source/markdown/podman-machine-init.1.md index 2adb15e6a..21c98b2c7 100644 --- a/docs/source/markdown/podman-machine-init.1.md +++ b/docs/source/markdown/podman-machine-init.1.md @@ -76,15 +76,33 @@ Set the timezone for the machine and containers. Valid values are `local` or a `timezone` such as `America/Chicago`. A value of `local`, which is the default, means to use the timezone of the machine host. -#### **--volume**, **-v**=*source:target* +#### **--volume**, **-v**=*source:target[:options]* Mounts a volume from source to target. Create a mount. If /host-dir:/machine-dir is specified as the `*source:target*`, Podman mounts _host-dir_ in the host to _machine-dir_ in the Podman machine. -The root filesystem is mounted read-only in the default operating system, -so mounts must be created under the /mnt directory. +Additional options may be specified as a comma-separated string. Recognized +options are: +* **ro**: mount volume read-only +* **rw**: mount volume read/write (default) +* **security_model=[model]**: specify 9p security model (see below) + +The 9p security model [determines] https://wiki.qemu.org/Documentation/9psetup#Starting_the_Guest_directly +if and how the 9p filesystem translates some filesystem operations before +actual storage on the host. The +default value of *mapped-xattr* specifies that 9p store symlinks and some file +attributes as extended attributes on the host. This is suitable when the host +and the guest do not need to interoperate on the shared filesystem, but has +caveats for actual shared access; notably, symlinks on the host are not usable +on the guest and vice versa. If interoperability is required, then choose +*none* instead, but keep in mind that the guest will not be able to do things +that the user running the virtual machine cannot do, e.g. create files owned by +another user. Using *none* is almost certainly the best choice for read-only +volumes. + +Example: `-v "$HOME/git:$HOME/git:ro,security_model=none"` Default volume mounts are defined in *containers.conf*. Unless changed, the default values is `$HOME:$HOME`. diff --git a/pkg/machine/qemu/machine.go b/pkg/machine/qemu/machine.go index 2fe0230cf..f94ce3959 100644 --- a/pkg/machine/qemu/machine.go +++ b/pkg/machine/qemu/machine.go @@ -318,6 +318,7 @@ func (v *MachineVM) Init(opts machine.InitOptions) (bool, error) { source := paths[0] target := source readonly := false + securityModel := "mapped-xattr" if len(paths) > 1 { target = paths[1] } @@ -325,18 +326,20 @@ func (v *MachineVM) Init(opts machine.InitOptions) (bool, error) { options := paths[2] volopts := strings.Split(options, ",") for _, o := range volopts { - switch o { - case "rw": + switch { + case o == "rw": readonly = false - case "ro": + case o == "ro": readonly = true + case strings.HasPrefix(o, "security_model="): + securityModel = strings.Split(o, "=")[1] default: fmt.Printf("Unknown option: %s\n", o) } } } if volumeType == VolumeTypeVirtfs { - virtfsOptions := fmt.Sprintf("local,path=%s,mount_tag=%s,security_model=mapped-xattr", source, tag) + virtfsOptions := fmt.Sprintf("local,path=%s,mount_tag=%s,security_model=%s", source, tag, securityModel) if readonly { virtfsOptions += ",readonly" } |