Split up the mapping of IDs from "runas".

Also have config files specify their user/group IDs for the commands.

mapids.sh

@@ -0,0 +1,80 @@
+#!/bin/bash
+
+#-----------------------------------------------------------------------------------------------------------------------
+
+function ts {
+  echo [`date '+%b %d %X'`]
+}
+
+#-----------------------------------------------------------------------------------------------------------------------
+
+function process_args {
+  # These are meant to be globals.
+  UMAP=$1
+  GMAP=$2
+
+  for NAME_UID_GID in $UMAP
+  do
+    if [[ ! "$NAME_UID_GID" =~ ^[A-Za-z0-9._][-A-Za-z0-9._]*:[0-9]{1,}:[0-9]{1,}$ ]]
+    then
+      echo "UMAP value $NAME_UID_GID is not valid. It should be of the form <user name>:<uid>:<gid>"
+      exit 1
+    fi
+  done
+
+  for NAME_GID in $GMAP
+  do
+    if [[ ! "$NAME_GID" =~ ^[A-Za-z0-9._][-A-Za-z0-9._]*:[0-9]{1,}$ ]]
+    then
+      echo "GMAP value $NAME_GID is not valid. It should be of the form <group name>:<gid>"
+      exit 1
+    fi
+  done
+}
+
+#-----------------------------------------------------------------------------------------------------------------------
+
+function update_users {
+  local UMAP=$1
+
+  if [[ "$UMAP" == "" ]]; then return; fi
+
+  echo "$(ts) Updating existing users..."
+
+  for NAME_UID_GID in $UMAP
+  do
+    local NAME=${NAME_UID_GID%:*:*}
+    local USER_ID=${NAME_UID_GID#*:}
+    USER_ID=${USER_ID%:*}
+    local GROUP_ID=${NAME_UID_GID#*:*:}
+
+    echo "$(ts) Setting user \"$NAME\" to user ID=\"$USER_ID\" and default group ID=\"$GROUP_ID\""
+    usermod -o -u $USER_ID -g $GROUP_ID $NAME
+  done
+}
+
+#-----------------------------------------------------------------------------------------------------------------------
+
+function update_groups {
+  local GMAP=$1
+
+  if [[ "$GMAP" == "" ]]; then return; fi
+
+  echo "$(ts) Updating existing groups..."
+
+  for NAME_GID in $GMAP
+  do
+    local NAME=${NAME_GID%:*}
+    local GROUP_ID=${NAME_GID#*:}
+
+    echo "$(ts) Setting group \"$NAME\" to ID=\"$GROUP_ID\""
+    groupmod -o -g $GROUP_ID $NAME
+  done
+}
+
+#-----------------------------------------------------------------------------------------------------------------------
+
+process_args "$@"
+
+update_users "$UMAP"
+update_groups "$GMAP"