Add first step of postgresql dump procedure

roles/backups/files/backup_script.sh

@@ -0,0 +1,69 @@
+#!/usr/bin/env bash
+set -euo pipefail
+IFS=$'\n\t'
+# Inspiration of script from: https://borgbackup.readthedocs.io/en/stable/quickstart.html#automating-backups
+
+logInfo() { printf '%(%Y-%m-%d %H:%m:%S)T [INFO]: %s\n' -1 "$*" >&2; }
+
+configurationFileLocation=$1
+
+workDirPath=/root/backup_work_dir
+logInfo "Creating working directory at: $workDirPath..."
+mkdir -p "$workDirPath"
+
+cleanup() {
+    logInfo "Backup interrupted"
+    # rm -f "$workDirPath" # TODO: Enable
+    exit 2
+}
+trap 'cleanup' INT TERM
+
+# region: ---------------------------------- DBBACKUPS ----------------------------------
+createDatabaseBackup() {
+    host=$1
+    dbname=$2
+    username=$3
+    password=$4
+    targetFolderPath=$5
+
+    logInfo "Dumping database: $dbname to $targetFolderPath..."
+
+    # Getting the correct version tools installed on the host proofed to be a very frustrating experience.
+    # So instead we'll do the dumping on the container.
+    postgresContainerName='postgres-postgres-1'
+    containerDumpPath=/dump.sql
+
+    logInfo "Dumping database $dbname on container: $postgresContainerName..."
+    docker exec "$postgresContainerName" bash -c "(export PGPASSWORD='$password'; pg_dump $dbname \
+        --file $containerDumpPath \
+        --host $host \
+        --username $username)"
+
+    logInfo "Extracting the archive from the container..."
+    docker cp "$postgresContainerName:$containerDumpPath" "$targetFolderPath/$dbname.sql" 2>/dev/null
+
+    logInfo "Removing the file from the docker container..."
+    docker exec "$postgresContainerName" rm "$containerDumpPath"
+}
+
+createAllDatabaseBackups() {
+    nrOfConfigurations="$(yq '.database_backups | length' <"$configurationFileLocation")"
+    logInfo "Backing up from $nrOfConfigurations database configurations..."
+
+    postgresBackupDirectory="$workDirPath/postgres"
+    mkdir -p "$postgresBackupDirectory"
+
+    for ((i = 0 ; i < "$nrOfConfigurations" ; i++)); do
+        dbConfiguration="$(yq ".database_backups[$i]" <"$configurationFileLocation")"
+        host="$(echo "$dbConfiguration" | jq -r '.host')"
+        dbname="$(echo "$dbConfiguration" | jq -r '.dbname')"
+        username="$(echo "$dbConfiguration" | jq -r '.username')"
+        password="$(echo "$dbConfiguration" | jq -r '.password')"
+        targetFolderPath="$postgresBackupDirectory"
+
+        createDatabaseBackup "$host" "$dbname" "$username" "$password" "$targetFolderPath"
+    done
+}
+# endregion: ------------------------------- DBBACKUPS ----------------------------------
+
+createAllDatabaseBackups