From 9aacb45947225fb8bc573768fb2d03ea155e7d4f Mon Sep 17 00:00:00 2001
From: Patrick Canterino <patrick@patrick-canterino.de>
Date: Mon, 27 Dec 2021 20:16:05 +0100
Subject: [PATCH] Added rotation of backups

---
 psmysqlbackup.ps1 | 23 ++++++++++++++++++++++-
 1 file changed, 22 insertions(+), 1 deletion(-)

diff --git a/psmysqlbackup.ps1 b/psmysqlbackup.ps1
index 7ca585a..77ba679 100644
--- a/psmysqlbackup.ps1
+++ b/psmysqlbackup.ps1
@@ -6,7 +6,7 @@
 [String]$configMysqldumpCli = "C:\Program Files\MariaDB 10.5\bin\mysqldump.exe"
 
 [String]$configBackupDir = "backup"
-[String]$configRotate = 7
+[Int32]$configRotate = 7
 
 function Get-Databases() {
     $databaseString = (& $configMysqlCli --host=$configMysqlHost --user=$configMysqlUser --password=$configMysqlPassword --batch --skip-column-names -e "SHOW DATABASES;")
@@ -19,6 +19,26 @@ function Create-Backup([String]$database, [String]$target) {
     & $configMysqldumpCli --host=$configMysqlHost --user=$configMysqlUser --password=$configMysqlPassword --single-transaction --result-file=$target $database
 }
 
+function Rotate-Backups($backupDir) {
+    if($configRotate -le 0) {
+		return
+	}
+	
+	$keepBackupsCount = $configRotate
+	
+	Get-ChildItem $backupDir -File | Where-Object {($_.Name -match "^backup-.+-\d{8,}-\d{6}\.sql$")} | Sort-Object -Descending |
+	Foreach-Object {
+		if($keepBackupsCount -ge 0) {
+			$keepBackupsCount--
+		}
+		
+		if($keepBackupsCount -eq -1) {
+			Write-Output "Deleting backup $($_.FullName)"
+			Remove-Item -Force $_.FullName
+		}
+	}
+}
+
 $currDaytime = Get-Date -format "yyyyMMdd-HHmmss"
 
 $databases = Get-Databases | Where-Object { $_ -ne "information_schema" -and $_ -ne "performance_schema"}
@@ -33,4 +53,5 @@ foreach($d in $databases) {
     $databaseBackupFile = Join-Path -Path $databaseBackupDir -ChildPath "backup-$d-$currDaytime.sql"
     Write-Output "Backing up $d to $databaseBackupFile..."
     Create-Backup $d $databaseBackupFile
+    Rotate-Backups $databaseBackupDir
 }
\ No newline at end of file
-- 
2.34.1