better ssh passphrase management

deploy/team-install.sh

@@ -10,7 +10,7 @@ USAGE:
 OPTIONS:
           -h   Print this usage statement
           -s   Use SSH vice SSL to download
-          -d   Destination directory for team repo 
+          -d   Destination directory for team repo
                (default: ${HOME}/scrimmage)
 
 EXAMPLES:
@@ -59,27 +59,32 @@ TEAM_NAME="$1"
 
 URL_PREFIX="https://gitlab.nps.edu/"
 if [ "${USE_SSH}" = true ]; then
+    #don't make me type my git ssh password every time:
     stty -echo
-    eval `ssh-agent`
-    eval `ssh-add`
+    if [ ! -S ${HOME}/.ssh/ssh_auth_sock ]; then
+        eval `ssh-agent`
+        ln -sf "$SSH_AUTH_SOCK" ~/.ssh/ssh_auth_sock
+    fi
+    export SSH_AUTH_SOCK=${HOME}/.ssh/ssh_auth_sock
+    ssh-add -l | grep "The agent has no identities" && ssh-add
     stty echo
     URL_PREFIX="git@gitlab.nps.edu:"
 fi
 
 # Create a map that points team names to team repo urls
 # bash 4 technique (associative array)
-declare -A REPOS 
+declare -A REPOS
 REPOS=(["scrimmage-templates"]="${URL_PREFIX}sasc-itar/scrimmage-templates.git" \
     ["usma"]="${URL_PREFIX}todd.brick_usma.edu/scrimmage-templates.git" \
     ["usafa"]="${URL_PREFIX}C17Alexander.Fulton_usafa.edu/scrimmage-templates.git" \
     ["usna"]="${URL_PREFIX}dawkins_usna.edu/scrimmage-templates.git")
 
 # Get the team repo url and ensure that it is valid"
-REPO_URL="${REPOS[$TEAM_NAME]}" 
+REPO_URL="${REPOS[$TEAM_NAME]}"
 if [ "$REPO_URL" = "" ]; then
     echo
     echo "ERROR: Invalid team name."
-    usage    
+    usage
     exit -2
 fi
 
@@ -97,7 +102,7 @@ pushd ${WORK_DIR} >& /dev/null
         git remote set-url origin "${REPO_URL}" > /dev/null 2>&1
         git fetch origin
         git reset --hard origin/master
-        
+
         # Run cmake and "build" the project
         mkdir -p ./build
         pushd ./build >& /dev/null