Add support for -env-host

This flag passes the host environment into the container.  The basic idea is to
leak all environment variables from the host into the container.

Environment variables from the image, and passed in via --env and --env-file
will override the host environment.

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

3 files changed, 14 insertions, 0 deletions

diff --git a/cmd/podman/common.go b/cmd/podman/common.go
index 50f3d9a7b..96a1c2244 100644
--- a/cmd/podman/common.go
+++ b/cmd/podman/common.go
@@ -221,6 +221,9 @@ func getCreateFlags(c *cliconfig.PodmanCommand) {
 		"env", "e", []string{},
 		"Set environment variables in container",
 	)
+	createFlags.Bool(
+		"env-host", false, "Use all current host environment variables in container",
+	)
 	createFlags.StringSlice(
 		"env-file", []string{},
 		"Read in a file of environment variables",
diff --git a/cmd/podman/shared/create.go b/cmd/podman/shared/create.go
index f401d3cf5..736a682eb 100644
--- a/cmd/podman/shared/create.go
+++ b/cmd/podman/shared/create.go
@@ -483,6 +483,16 @@ func ParseCreateOpts(ctx context.Context, c *GenericCLIResults, runtime *libpod.
 
 	// ENVIRONMENT VARIABLES
 	env := EnvVariablesFromData(data)
+	if c.Bool("env-host") {
+		for _, e := range os.Environ() {
+			pair := strings.SplitN(e, "=", 2)
+			if _, ok := env[pair[0]]; !ok {
+				if len(pair) > 1 {
+					env[pair[0]] = pair[1]
+				}
+			}
+		}
+	}
 	if err := parse.ReadKVStrings(env, c.StringSlice("env-file"), c.StringArray("env")); err != nil {
 		return nil, errors.Wrapf(err, "unable to process environment variables")
 	}
diff --git a/cmd/podman/shared/intermediate.go b/cmd/podman/shared/intermediate.go
index eecd1604c..855f84086 100644
--- a/cmd/podman/shared/intermediate.go
+++ b/cmd/podman/shared/intermediate.go
@@ -393,6 +393,7 @@ func NewIntermediateLayer(c *cliconfig.PodmanCommand, remote bool) GenericCLIRes
 	m["dns-search"] = newCRStringSlice(c, "dns-search")
 	m["entrypoint"] = newCRString(c, "entrypoint")
 	m["env"] = newCRStringArray(c, "env")
+	m["env-host"] = newCRBool(c, "env-host")
 	m["env-file"] = newCRStringSlice(c, "env-file")
 	m["expose"] = newCRStringSlice(c, "expose")
 	m["gidmap"] = newCRStringSlice(c, "gidmap")