chore: fix wrappers' lib name (#774)

* chore: fix wrappers' lib name

* chore: limit `find` printing; comments

Author: pcnc

ansible/files/admin_api_scripts/pg_upgrade_scripts/initiate.sh

@@ -46,6 +46,7 @@ OLD_PGVERSION=$(run_sql -A -t -c "SHOW server_version;")
 
 POSTGRES_CONFIG_PATH="/etc/postgresql/postgresql.conf"
 PGBINOLD="/usr/lib/postgresql/bin"
+PGLIBOLD="/usr/lib/postgresql/lib"
 
 # If upgrading from older major PG versions, disable specific extensions
 if [[ "$OLD_PGVERSION" =~ ^14.* ]]; then
@@ -247,6 +248,29 @@ function initiate_upgrade {
 
     cp --remove-destination "$PGLIBNEW"/*.control "$PGSHARENEW/extension/"
     cp --remove-destination "$PGLIBNEW"/*.sql "$PGSHARENEW/extension/"
+
+    # This is a workaround for older versions of wrappers which don't have the expected
+    #  naming scheme, containing the version in their library's file name
+    #  e.g. wrappers-0.1.16.so, rather than wrappers.so
+    # pg_upgrade errors out when it doesn't find an equivalent file in the new PG version's
+    #  library directory, so we're making sure the new version has the expected (old version's)
+    #  file name.
+    # After the upgrade completes, the new version's library file is used.
+    # i.e. 
+    #  - old version: wrappers-0.1.16.so
+    #  - new version: wrappers-0.1.18.so
+    #  - workaround to make pg_upgrade happy: copy wrappers-0.1.18.so to wrappers-0.1.16.so
+    if [ -d "$PGLIBOLD" ]; then
+        WRAPPERS_LIB_PATH=$(find "$PGLIBNEW" -name "wrappers*so" -print -quit)
+        if [ -f "$WRAPPERS_LIB_PATH" ]; then
+            OLD_WRAPPER_LIB_PATH=$(find "$PGLIBOLD" -name "wrappers*so" -print -quit)
+            if [ -f "$OLD_WRAPPER_LIB_PATH" ]; then
+                LIB_FILE_NAME=$(basename "$OLD_WRAPPER_LIB_PATH")
+                cp "$WRAPPERS_LIB_PATH" "$PGLIBNEW/${LIB_FILE_NAME}"
+            fi
+        fi
+    fi
+
     export LD_LIBRARY_PATH="${PGLIBNEW}"
 
     echo "8. Creating new data directory, initializing database"