epm-install: add show-command-only support

bin/epm

@@ -64,6 +64,7 @@ quiet=
 nodeps=
 non_interactive=
 skip_installed=
+show_command_only=
 epm_cmd=
 pkg_files=
 pkg_names=
@@ -182,6 +183,9 @@ for opt in "$@" ; do
     --skip-installed)     # HELPOPT: skip already install during install
         skip_installed=1
         ;;
+    --show-command-only)  # HELPOPT: show command only, do not any action
+        show_command_only=1
+        ;;
     --quiet)              # HELPOPT: quiet mode (do not print commands before exec)
         quiet=1
         ;;

bin/epm-install

@@ -151,9 +151,38 @@ epm_install_files()
     epm_install_names $@
 }
 
+epm_print_install_command()
+{
+    case $PMTYPE in
+        apt-rpm|yum-rpm|urpm-rpm|zypper-rpm)
+            echo "rpm -Uvh --force $nodeps $@"
+            ;;
+        apt-dpkg)
+            echo "dpkg -i $@"
+            ;;
+        pkg_add)
+            echo "pkg_add $@"
+            ;;
+        pacman)
+            echo "pacman -U --noconfirm $@"
+            ;;
+        slackpkg)
+            echo "installpkg $@"
+            ;;
+        *)
+            fatal "Do not known appropriate install command for $PMTYPE"
+            ;;
+    esac
+}
+
 
 epm_install()
 {
+    if [ -n "$show_command_only" ] ; then
+        epm_print_install_command $names
+        return
+    fi
+
     [ -n "$pkg_files$pkg_names" ] || fatal "Run install without packages"
 
     local names="$(echo $pkg_names | filter_out_installed_packages)"