Before backing up a selection of database, check if the databases exist

[psmysqlbackup.git] / psmysqlbackup.ps1

diff --git a/psmysqlbackup.ps1 b/psmysqlbackup.ps1
index 164bdeb93d17a25ea887e2b975c533799536c06e..1e23c5e6c9c10416d31b9e58f47a424aa6aea6b4 100644 (file)
--- a/psmysqlbackup.ps1
+++ b/psmysqlbackup.ps1
@@ -1,28 +1,114 @@
-[String]$configMysqlHost = "localhost"
-[String]$configMysqlUser = "backup"
-[String]$configMysqlPassword = "backup"
+# PSMySQLBackup
+# PowerShell script for backing up MySQL / MariaDB databases on Windows 
+#
+# Author: Patrick Canterino <patrick@patrick-canterino.de>
+# WWW: https://www.patrick-canterino.de/
+#      https://github.com/pcanterino/dsmonrot
+# License: 2-Clause BSD License
 
-[String]$configMysqlCli = "C:\Program Files\MariaDB 10.5\bin\mysql.exe"
-[String]$configMysqldumpCli = "C:\Program Files\MariaDB 10.5\bin\mysqldump.exe"
+# Config
 
-[String]$configBackupDir = "backup"
-[String]$configRotate = 7
+$configMysqlHost = "localhost"
+$configMysqlPort = 3306
+$configMysqlUser = "backup"
+$configMysqlPassword = "backup"
+
+$configMysqlCli = "C:\Program Files\MariaDB 10.5\bin\mysql.exe"
+$configMysqldumpCli = "C:\Program Files\MariaDB 10.5\bin\mysqldump.exe"
+
+$configBackupDir = "backup"
+$configRotate = 7
+
+$configDbBackup = @()
+$configDbExclusions = @("test")
+
+# End of config
 
 function Get-Databases() {
-    $databaseString = (& $configMysqlCli --host=$configMysqlHost --user=$configMysqlUser --password=$configMysqlPassword --batch --skip-column-names -e "SHOW DATABASES;")
+    $databaseString = (& $configMysqlCli --host=$configMysqlHost --port=$configMysqlPort --user=$configMysqlUser --password=$configMysqlPassword --batch --skip-column-names -e "SHOW DATABASES;")
+    
+    if($LastExitCode -ne 0) {
+        throw "MySQL CLI exited with Exit code $LastExitCode"
+    }
+    
     $databases = $databaseString.split([Environment]::NewLine)
 
     return $databases
 }
 
 function Create-Backup([String]$database, [String]$target) {
-    & $configMysqldumpCli --host=$configMysqlHost --user=$configMysqlUser --password=$configMysqlPassword --single-transaction --result-file=$target $database
+    & $configMysqldumpCli --host=$configMysqlHost --port=$configMysqlPort --user=$configMysqlUser --password=$configMysqlPassword --single-transaction --result-file=$target $database
+
+    if($LastExitCode -ne 0) {
+        throw "mysqldump exited with Exit code $LastExitCode"
+    }
 }
 
-$databases = Get-Databases | Where-Object { $_ -ne "information_schema" -and $_ -ne "performance_schema"}
+function Rotate-Backups($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 $_.FullName
+        }
+    }
+}
+
+$defaultExclusions = @("information_schema", "performance_schema")
+
+$currDaytime = Get-Date -format "yyyyMMdd-HHmmss"
+
+try {
+    $databases = Get-Databases | Where-Object {!($_ -in $defaultExclusions -or $_ -in $configDbExclusions)}
+}
+catch {
+    Write-Output "Failed to get list of databases"
+    Write-Output $_
+    exit 1
+}
+
+$databasesToBackup = @()
+
+if($configDbBackup -and $configDbBackup.count -gt 0) {
+    foreach($cDb in $configDbBackup) {
+        if($cDb -in $databases) {
+            $databasesToBackup += $cDb
+        }
+        else {
+            Write-Warning "Not backing up database $cDb, because it does not exist"
+        }
+    }
+}
+else {
+    $databasesToBackup = $databases
+}
+
+foreach($d in $databasesToBackup) {
+    $databaseBackupDir = Join-Path -Path $configBackupDir -ChildPath $d
+
+    if(!(Test-Path $databaseBackupDir)) {
+        New-Item -ItemType directory -Path $databaseBackupDir -ErrorAction Stop | Out-Null
+    }
 
-foreach($d in $databases) {
-    $backupFile = $configBackupDir + "\" + $d + ".sql"
-    Write-Output "Backing up $d to $backupFile..."
-    Create-Backup $d $backupFile
+    $databaseBackupFile = Join-Path -Path $databaseBackupDir -ChildPath "backup-$d-$currDaytime.sql"
+    Write-Output "Backing up $d to $databaseBackupFile..."
+    
+    try {
+        Create-Backup $d $databaseBackupFile
+        Rotate-Backups $databaseBackupDir
+    }
+    catch {
+        Write-Output "Could not backup database $d to $databaseBackupFile"
+        Write-Output $_
+    }
 }
\ No newline at end of file