Avoid awk error in hosts-config.sh for large deployments

This ports the fixes made to the legacy 51-hosts script, which this
script is derived from, to tht.

See related t-i-e patch Ibe0a9f6ec10d55750e3b0e16301236141f988d69

Change-Id: Ide922af93a5d185bd592e220327326f1d244c4e2
Closes-Bug: #1674732

diff --git a/scripts/hosts-config.sh b/scripts/hosts-config.sh
index f456b31..b3109a0 100755 (executable)
--- a/scripts/hosts-config.sh
+++ b/scripts/hosts-config.sh
@@ -13,14 +13,16 @@ write_entries() {
 
     if grep -q "^# HEAT_HOSTS_START" "$file"; then
         temp=$(mktemp)
-        awk -v v="$entries" '/^# HEAT_HOSTS_START/ {
-            print $0
-            print v
-            f=1
-            }f &&!/^# HEAT_HOSTS_END$/{next}/^# HEAT_HOSTS_END$/{f=0}!f' "$file" > "$temp"
-            echo "INFO: Updating hosts file $file, check below for changes"
-            diff "$file" "$temp" || true
-            cat "$temp" > "$file"
+        (
+        sed '/^# HEAT_HOSTS_START/,$d' "$file"
+        echo -ne "\n# HEAT_HOSTS_START - Do not edit manually within this section!\n"
+        echo "$entries"
+        echo -ne "# HEAT_HOSTS_END\n\n"
+        sed '1,/^# HEAT_HOSTS_END/d' "$file"
+        ) > "$temp"
+        echo "INFO: Updating hosts file $file, check below for changes"
+        diff "$file" "$temp" || true
+        cat "$temp" > "$file"
     else
         echo -ne "\n# HEAT_HOSTS_START - Do not edit manually within this section!\n" >> "$file"
         echo "$entries" >> "$file"