Set -env variables as appropriate

close #3648

podman create and podman run do not set --env variable if the environment is not present with a value

Signed-off-by: Qi Wang <qiwan@redhat.com>

2 files changed, 28 insertions, 4 deletions

diff --git a/docs/podman-create.1.md b/docs/podman-create.1.md
index d796c2586..50fca3541 100644
--- a/docs/podman-create.1.md
+++ b/docs/podman-create.1.md
@@ -253,9 +253,9 @@ You need to specify multi option commands in the form of a json string.
 
 Set environment variables
 
-This option allows you to specify arbitrary environment variables that are available for the process that will be launched inside of the container. If you specify a environment variable without a value, podman will check the host environment for a value or set the environment to "". If you specify a environment variable ending in --*--, podman will search the host environment for variables starting with the prefix and add them to the container.  If you want to add an environment variable with a ***** following it, then you need to set a value.
+This option allows arbitrary environment variables that are available for the process to be launched inside of the container.  If an environment variable is specified without a value, Podman will check the host environment for a value and set the variable only if it is set on the host.  If an environment variable ending in __*__ is specified, Podman will search the host environment for variables starting with the prefix and will add those variables to the container.  If an environment variable with a trailing ***** is specified, then a value must be supplied.
 
-See **Environment** note below for precedence.
+See [**Environment**](#environment) note below for precedence and examples.
 
 **--env-host**=*true|false*
 
@@ -933,6 +933,19 @@ Precedence Order:
 
 	   **--env** : Any environment variables specified will override previous settings.
 
+Create containers and set the environment ending with a __*__ and a *****
+
+```
+$ export ENV1=a
+$ podman create --name ctr --env ENV* alpine printenv ENV1
+$ podman start --attach ctr
+a
+
+$ podman create --name ctr --env ENV*****=b alpine printenv ENV*****
+$ podman start --attach ctr
+b
+```
+
 ## FILES
 
 **/etc/subuid**
diff --git a/docs/podman-run.1.md b/docs/podman-run.1.md
index f5f44fad4..209a07c0c 100644
--- a/docs/podman-run.1.md
+++ b/docs/podman-run.1.md
@@ -260,9 +260,9 @@ You need to specify multi option commands in the form of a json string.
 
 Set environment variables
 
-This option allows you to specify arbitrary environment variables that are available for the process that will be launched inside of the container. If you specify a environment variable without a value, podman will check the host environment for a value or set the environment to "". If you specify a environment variable ending in --*--, podman will search the host environment for variables starting with the prefix and add them to the container.  If you want to add an environment variable with a ***** following it, then you need to set a value.
+This option allows arbitrary environment variables that are available for the process to be launched inside of the container.  If an environment variable is specified without a value, Podman will check the host environment for a value and set the variable only if it is set on the host.  If an environment variable ending in __*__ is specified, Podman will search the host environment for variables starting with the prefix and will add those variables to the container.  If an environment variable with a trailing ***** is specified, then a value must be supplied.
 
-See **Environment** note below for precedence.
+See [**Environment**](#environment) note below for precedence and examples.
 
 **--env-host**=*true|false*
 
@@ -1219,6 +1219,17 @@ Precedence Order:
 
 	   **--env** : Any environment variables specified will override previous settings.
 
+Run containers and set the environment ending with a __*__ and a *****
+
+```
+$ export ENV1=a
+$ $ podman run --env ENV* alpine printenv ENV1
+a
+
+$ podman run --env ENV*****=b alpine printenv ENV*****
+b
+```
+
 ## FILES
 
 **/etc/subuid**