Add --read-only-tmpfs options

The --read-only-tmpfs option caused podman to mount tmpfs on /run, /tmp, /var/tmp
if the container is running int read-only mode.

The default is true, so you would need to execute a command like

--read-only --read-only-tmpfs=false to turn off this behaviour.

Signed-off-by: Daniel J Walsh <dwalsh@redhat.com>

6 files changed, 11 insertions, 1 deletions

diff --git a/cmd/podman/common.go b/cmd/podman/common.go
index ba4a3f519..eac96d3ba 100644
--- a/cmd/podman/common.go
+++ b/cmd/podman/common.go
@@ -434,6 +434,10 @@ func getCreateFlags(c *cliconfig.PodmanCommand) {
 		"read-only", false,
 		"Make containers root filesystem read-only",
 	)
+	createFlags.Bool(
+		"read-only-tmpfs", true,
+		"When running containers in read-only mode mount a read-write tmpfs on /run, /tmp and /var/tmp",
+	)
 	createFlags.String(
 		"restart", "",
 		"Restart is not supported.  Please use a systemd unit file for restart",
diff --git a/cmd/podman/shared/container.go b/cmd/podman/shared/container.go
index e14276bdf..9050fd2b9 100644
--- a/cmd/podman/shared/container.go
+++ b/cmd/podman/shared/container.go
@@ -658,7 +658,8 @@ func GetCtrInspectInfo(config *libpod.ContainerConfig, ctrInspectData *inspect.C
 			OomKillDisable:       memDisableOOMKiller,
 			PidsLimit:            pidsLimit,
 			Privileged:           config.Privileged,
-			ReadonlyRootfs:       spec.Root.Readonly,
+			ReadOnlyRootfs:       spec.Root.Readonly,
+			ReadOnlyTmpfs:        createArtifact.ReadOnlyTmpfs,
 			Runtime:              config.OCIRuntime,
 			NetworkMode:          string(createArtifact.NetMode),
 			IpcMode:              string(createArtifact.IpcMode),
diff --git a/cmd/podman/shared/create.go b/cmd/podman/shared/create.go
index 3f54e193f..c521f9cb6 100644
--- a/cmd/podman/shared/create.go
+++ b/cmd/podman/shared/create.go
@@ -650,6 +650,7 @@ func ParseCreateOpts(ctx context.Context, c *GenericCLIResults, runtime *libpod.
 		PortBindings:   portBindings,
 		Quiet:          c.Bool("quiet"),
 		ReadOnlyRootfs: c.Bool("read-only"),
+		ReadOnlyTmpfs:  c.Bool("read-only-tmpfs"),
 		Resources: cc.CreateResourceConfig{
 			BlkioWeight:       blkioWeight,
 			BlkioWeightDevice: c.StringSlice("blkio-weight-device"),
diff --git a/cmd/podman/shared/intermediate.go b/cmd/podman/shared/intermediate.go
index 2e1827561..9c494dec5 100644
--- a/cmd/podman/shared/intermediate.go
+++ b/cmd/podman/shared/intermediate.go
@@ -434,6 +434,7 @@ func NewIntermediateLayer(c *cliconfig.PodmanCommand, remote bool) GenericCLIRes
 	m["publish-all"] = newCRBool(c, "publish-all")
 	m["quiet"] = newCRBool(c, "quiet")
 	m["read-only"] = newCRBool(c, "read-only")
+	m["read-only-tmpfs"] = newCRBool(c, "read-only-tmpfs")
 	m["restart"] = newCRString(c, "restart")
 	m["rm"] = newCRBool(c, "rm")
 	m["rootfs"] = newCRBool(c, "rootfs")
diff --git a/cmd/podman/shared/intermediate_varlink.go b/cmd/podman/shared/intermediate_varlink.go
index d62a65955..5e21245e3 100644
--- a/cmd/podman/shared/intermediate_varlink.go
+++ b/cmd/podman/shared/intermediate_varlink.go
@@ -141,6 +141,7 @@ func (g GenericCLIResults) MakeVarlink() iopodman.Create {
 		PublishAll:             BoolToPtr(g.Find("publish-all")),
 		Quiet:                  BoolToPtr(g.Find("quiet")),
 		Readonly:               BoolToPtr(g.Find("read-only")),
+		Readonlytmpfs:          BoolToPtr(g.Find("read-only-tmpfs")),
 		Restart:                StringToPtr(g.Find("restart")),
 		Rm:                     BoolToPtr(g.Find("rm")),
 		Rootfs:                 BoolToPtr(g.Find("rootfs")),
@@ -397,6 +398,7 @@ func VarlinkCreateToGeneric(opts iopodman.Create) GenericCLIResults {
 	m["publish-all"] = boolFromVarlink(opts.PublishAll, "publish-all", false)
 	m["quiet"] = boolFromVarlink(opts.Quiet, "quiet", false)
 	m["read-only"] = boolFromVarlink(opts.Readonly, "read-only", false)
+	m["read-only-tmpfs"] = boolFromVarlink(opts.Readonlytmpfs, "read-only-tmpfs", true)
 	m["restart"] = stringFromVarlink(opts.Restart, "restart", nil)
 	m["rm"] = boolFromVarlink(opts.Rm, "rm", false)
 	m["rootfs"] = boolFromVarlink(opts.Rootfs, "rootfs", false)
diff --git a/cmd/podman/varlink/io.podman.varlink b/cmd/podman/varlink/io.podman.varlink
index 17179d665..309f9765a 100644
--- a/cmd/podman/varlink/io.podman.varlink
+++ b/cmd/podman/varlink/io.podman.varlink
@@ -346,6 +346,7 @@ type Create (
     publishAll: ?bool,
     quiet: ?bool,
     readonly: ?bool,
+    readonlytmpfs: ?bool,
     restart: ?string,
     rm: ?bool,
     rootfs: ?bool,