Revert "Bump wal-g version to v3.0.0 (zalando#987)"

This reverts commit 5f69a19.

There currently is an open bug in wal-g which breaks archiving backups
to S3 when using AssumeRole on AWS: zalando#1009

Revert to a functioning version of wal-g,  until the issue has been
resolved.

postgres-appliance/Dockerfile

@@ -19,7 +19,7 @@ FROM $BASE_IMAGE as dependencies-builder
 
 ARG DEMO
 
-ENV WALG_VERSION=v3.0.3
+ENV WALG_VERSION=v2.0.1
 
 COPY build_scripts/dependencies.sh /builddeps/
 

postgres-appliance/bootstrap/clone_with_wale.py

@@ -57,7 +57,7 @@ def fix_output(output):
     started = None
     for line in output.decode('utf-8').splitlines():
         if not started:
-            started = re.match(r'^(backup_)?name\s+(last_)?modified\s+', line)
+            started = re.match(r'^name\s+last_modified\s+', line) or re.match(r'^name\s+modified\s+', line)
             if started:
                 line = line.replace(' modified ', ' last_modified ')
         if started:
@@ -75,7 +75,7 @@ def choose_backup(backup_list, recovery_target_time):
                 match = backup
                 match_timestamp = last_modified
     if match is not None:
-        return match.get('name', match['backup_name'])
+        return match['name']
 
 
 def list_backups(env):

postgres-appliance/scripts/wale_restore.sh

@@ -43,7 +43,7 @@ ATTEMPT=0
 server_version="-1"
 while true; do
     [[ -z $wal_segment_backup_start ]] && wal_segment_backup_start=$($WAL_E backup-list 2> /dev/null \
-        | sed '0,/^\(backup_\)\?name\s*\(last_\)\?modified\s*/d' | sort -bk2 | tail -n1 | awk '{print $3;}' | sed 's/_.*$//')
+        | sed '0,/^name\s*\(last_\)\?modified\s*/d' | sort -bk2 | tail -n1 | awk '{print $3;}' | sed 's/_.*$//')
 
     [[ -n "$CONNSTR" && $server_version == "-1" ]] && server_version=$(psql -d "$CONNSTR" -tAc 'show server_version_num' 2> /dev/null || echo "-1")
 

postgres-appliance/tests/test_spilo.sh

@@ -300,9 +300,7 @@ function test_spilo() {
 
 
     # TEST SUITE 1
-    # wait clone to finish and prevent timescale installation gets cloned
-    find_leader "$upgrade3_container"
-    find_leader "$upgrade_container"
+    find_leader "$upgrade_container" # wait clone to finish and prevent timescale installation gets cloned
     create_timescaledb "$container" # we don't install it at the beginning, as we do 13->17 in a clone
 
     log_info "[TS1] Testing in-place major upgrade 13->14"