specgen: do not always set shmsize

if it wasn't overriden on the CLI, leave it undefined.

Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>

3 files changed, 12 insertions, 5 deletions

diff --git a/cmd/podman/common/create.go b/cmd/podman/common/create.go
index bdf762ed7..e5ee76390 100644
--- a/cmd/podman/common/create.go
+++ b/cmd/podman/common/create.go
@@ -394,8 +394,9 @@ func GetCreateFlags(cf *ContainerCLIOpts) *pflag.FlagSet {
 		"security-opt", containerConfig.SecurityOptions(),
 		"Security Options",
 	)
+	shmSize := ""
 	createFlags.StringVar(
-		&cf.ShmSize,
+		&shmSize,
 		"shm-size", containerConfig.ShmSize(),
 		"Size of /dev/shm "+sizeWithUnitFormat,
 	)
diff --git a/cmd/podman/common/specgen.go b/cmd/podman/common/specgen.go
index 10ae0bb2d..994c5367e 100644
--- a/cmd/podman/common/specgen.go
+++ b/cmd/podman/common/specgen.go
@@ -403,11 +403,13 @@ func FillOutSpecGen(s *specgen.SpecGenerator, c *ContainerCLIOpts, args []string
 	}
 
 	// SHM Size
-	shmSize, err := units.FromHumanSize(c.ShmSize)
-	if err != nil {
-		return errors.Wrapf(err, "unable to translate --shm-size")
+	if c.ShmSize != "" {
+		shmSize, err := units.FromHumanSize(c.ShmSize)
+		if err != nil {
+			return errors.Wrapf(err, "unable to translate --shm-size")
+		}
+		s.ShmSize = &shmSize
 	}
-	s.ShmSize = &shmSize
 	s.HostAdd = c.Net.AddHosts
 	s.UseImageResolvConf = c.Net.UseImageResolvConf
 	s.DNSServers = c.Net.DNSServers
diff --git a/cmd/podman/containers/create.go b/cmd/podman/containers/create.go
index 8c0e40122..f8a7c07ef 100644
--- a/cmd/podman/containers/create.go
+++ b/cmd/podman/containers/create.go
@@ -131,6 +131,10 @@ func createInit(c *cobra.Command) error {
 		logrus.Warn("setting security options with --privileged has no effect")
 	}
 
+	if c.Flag("shm-size").Changed {
+		cliVals.ShmSize = c.Flag("shm-size").Value.String()
+	}
+
 	if (c.Flag("dns").Changed || c.Flag("dns-opt").Changed || c.Flag("dns-search").Changed) && (cliVals.Net.Network.NSMode == specgen.NoNetwork || cliVals.Net.Network.IsContainer()) {
 		return errors.Errorf("conflicting options: dns and the network mode.")
 	}