User/hshami/fix check runtime existing (#25)

* handle case where edge runtime is already installed

* break down the key steps

* fix exit code log_info

src/azure-iot-edge-installer.sh

@@ -138,14 +138,22 @@ else
     platform=$(get_platform)
     prepare_apt $platform
 
+    OK_TO_CONTINUE=true
     source install-container-management.sh
     install_container_management
 
-    source install-edge-runtime.sh
-    install_edge_runtime ${parsed_cmds["SCOPE_ID"]}  ${parsed_cmds["REGISTRATION_ID"]} ${parsed_cmds["SYMMETRIC_KEY"]}
+    if [[ $OK_TO_CONTINUE == true ]];
+    then
+        OK_TO_CONTINUE=false
+        source install-edge-runtime.sh
+        install_edge_runtime ${parsed_cmds["SCOPE_ID"]}  ${parsed_cmds["REGISTRATION_ID"]} ${parsed_cmds["SYMMETRIC_KEY"]}
 
-    source validate-post-install.sh
-    validate_post_install
+        if [[ $OK_TO_CONTINUE == true ]];
+        then
+            source validate-post-install.sh
+            validate_post_install
+        fi
+    fi
 fi
 
 # cleanup, always

src/install-container-management.sh

@@ -12,7 +12,7 @@
 # OUTPUTS:
 #    Write output to stdout
 # RETURN:
-#
+#    updates the global variable OK_TO_CONTINUE in case of failure to false.
 ######################################
 
 install_container_management() {
@@ -22,6 +22,12 @@ install_container_management() {
     else
         log_info "Running install-container-management.sh"
 
-        apt install moby-engine -y
+        apt-get install moby-engine -y
+        exit_code=$?
+        if [[ $exit_code != 0 ]];
+        then
+            OK_TO_CONTINUE=false
+            log_info "'apt-get install moby-engine' returned %d\n" $exit_code
+        fi
     fi
 }

src/install-edge-runtime.sh

@@ -8,9 +8,9 @@
 ######################################
 # install_edge_runtime
 #
-#    installs Azure IoT Edge Runtime 1.2
-#    generates the edge's configuration file from template and
-#       fills in the DPS provisioning section from provided parameters
+#    - installs Azure IoT Edge Runtime 1.2
+#    - generates the edge's configuration file from template and
+#      fills in the DPS provisioning section from provided parameters
 #
 # ARGUMENTS:
 #    SCOPE_ID
@@ -19,10 +19,9 @@
 # OUTPUTS:
 #    Write output to stdout
 # RETURN:
-#
+#    updates the global variable OK_TO_CONTINUE in case of success to true.
 ######################################
 
-
 function install_edge_runtime() {
     if [[ $# != 3 || "$1" == "" || "$2" == "" || "$3" == "" ]];
     then
@@ -39,10 +38,22 @@ function install_edge_runtime() {
     fi
 
     apt-get install aziot-edge -y
+    exit_code=$?
+    if [[ $exit_code != 0 ]];
+    then
+        log_info "'apt-get install aziot-edge' returned %d\n" $exit_code
+        return
+    fi
 
     # create .toml from template
     log_info "create .toml from template."
     cp /etc/aziot/config.toml.edge.template /etc/aziot/config.toml
+    exit_code=$?
+    if [[ $exit_code != 0 ]];
+    then
+        log_info "'cp /etc/aziot/config.toml.edge.template /etc/aziot/config.toml' returned %d\n" $exit_code
+        return
+    fi
 
     local SCOPE_ID=$1
     local REGISTRATION_ID=$2
@@ -69,4 +80,6 @@ symmetric_key = { value = \"'$SYMMETRIC_KEY'\" }
 
     log_info "Apply settings - this will restart the edge"
     iotedge config apply
+
+    OK_TO_CONTINUE=true
 }

src/utils.sh

@@ -14,6 +14,7 @@ BOLD=$(echo -en "\e[01m")
 BLINK=$(echo -en "\e[5m")
 
 OPT_IN=false
+OK_TO_CONTINUE=false
 
 ######################################
 # set_opt_out_selection
@@ -108,7 +109,7 @@ function cmd_parser() {
     declare -A parsed_cmd
     for key in ${!flag_to_variable_dict[*]};
     do
-        parsed_cmd[${flag_to_variable_dict[$key]}]=false
+        parsed_cmd[${flag_to_variable_dict[$key]}]=""
     done
 
     while [ $# -ne 0 ];
@@ -249,15 +250,16 @@ function prepare_apt() {
             # sources list
             log_info "Adding'%s' to repository lists." $sources
             wget $sources -q -O /etc/apt/sources.list.d/microsoft-prod.list
-            exit_code=$?
+            local exit_code=$?
             if [[ $exit_code != 0 ]];
             then
                 log_error "prepare_apt() step 1 failed with error: %d\n" exit_code
                 exit 3
             fi
 
-            # the key
-            wget https://packages.microsoft.com/keys/microsoft.asc -q -O /dev/stdout | gpg --dearmor > /etc/apt/trusted.gpg.d/microsoft.gpg
+            log_info "Downloading key\n"
+            local tmp_file=$(echo `mktemp -u`)
+            wget https://packages.microsoft.com/keys/microsoft.asc -q -O $tmp_file
             exit_code=$?
             if [[ $exit_code != 0 ]];
             then
@@ -266,10 +268,29 @@ function prepare_apt() {
                 exit 4
             fi
 
-            # update
-            apt update
+            # unpack the key
+            local gpg_file=/etc/apt/trusted.gpg.d/microsoft.gpg
+            if [[ -f $gpg_file ]];
+            then
+                rm -f $gpg_file &> /dev/null
+            fi
+            gpg --dearmor --output $gpg_file $tmp_file
             exit_code=$?
-            log_info "'apt update' returned %d\n" exit_code
+
+            rm -f $tmp_file &> /dev/null
+
+            if [[ $exit_code != 0 ]];
+            then
+                log_error "prepare_apt() step 2 failed with error %d\n" $exit_code
+                rm -f /etc/apt/sources.list.d/microsoft-prod.list &> /dev/null
+                exit 4
+            fi
+            log_info "Downloaded key\n"
+
+            # update
+            apt-get update
+            exit_code=$?
+            log_info "'apt-get update' returned %d\n" $exit_code
         fi
     fi
 }