Merge commit '21ca061287c2ee82ad27227ffb64041fe154bf11' as 'oh-my-zsh'

oh-my-zsh/plugins/gpg-agent/gpg-agent.plugin.zsh

@@ -0,0 +1,41 @@
+local GPG_ENV=$HOME/.gnupg/gpg-agent.env
+
+function start_agent_nossh {
+    eval $(/usr/bin/env gpg-agent --quiet --daemon --write-env-file ${GPG_ENV} 2> /dev/null)
+    chmod 600 ${GPG_ENV}
+    export GPG_AGENT_INFO
+}
+
+function start_agent_withssh {
+    eval $(/usr/bin/env gpg-agent --quiet --daemon --enable-ssh-support --write-env-file ${GPG_ENV} 2> /dev/null)
+    chmod 600 ${GPG_ENV}
+    export GPG_AGENT_INFO
+    export SSH_AUTH_SOCK
+    export SSH_AGENT_PID
+}
+
+# check if another agent is running
+if ! gpg-connect-agent --quiet /bye > /dev/null 2> /dev/null; then
+    # source settings of old agent, if applicable
+    if [ -f "${GPG_ENV}" ]; then
+        . ${GPG_ENV} > /dev/null
+        export GPG_AGENT_INFO
+        export SSH_AUTH_SOCK
+        export SSH_AGENT_PID
+    fi
+
+    # check again if another agent is running using the newly sourced settings
+    if ! gpg-connect-agent --quiet /bye > /dev/null 2> /dev/null; then
+        # check for existing ssh-agent
+        if ssh-add -l > /dev/null 2> /dev/null; then
+            # ssh-agent running, start gpg-agent without ssh support
+            start_agent_nossh;
+        else
+            # otherwise start gpg-agent with ssh support
+            start_agent_withssh;
+        fi
+    fi
+fi
+
+GPG_TTY=$(tty)
+export GPG_TTY