From 6b6b093de673cf7a67102e318246c91630a8b27d Mon Sep 17 00:00:00 2001
From: Buleandra Cristian <cristian.buleandra@gmail.com>
Date: Wed, 5 Nov 2025 01:44:16 +0100
Subject: [PATCH 1/2] Enhance backup script with pigz support

Added support for parallel compression and decompression using pigz if available.
---
 migrate.sh | 23 +++++++++++++++++++++--
 1 file changed, 21 insertions(+), 2 deletions(-)

diff --git a/migrate.sh b/migrate.sh
index 457b848..62d548a 100644
--- a/migrate.sh
+++ b/migrate.sh
@@ -84,8 +84,17 @@ if [ ! -f "$backupFileName" ]; then
     echo "🚸 Docker not stopped, continuing with the backup"
   fi
 
+  # Choose compressor
+  if command -v pigz >/dev/null 2>&1; then
+    echo "✅ Using pigz for parallel gzip"
+    compressor="pigz -p$(nproc)"
+  else
+    echo "ℹ️ pigz not found, using gzip"
+    compressor="gzip"
+  fi
+
   # shellcheck disable=SC2086
-  if ! tar --exclude='*.sock' -Pczf $backupFileName -C / $backupSourceDir $HOME/.ssh/authorized_keys $volumePaths; then
+  if ! tar --exclude='*.sock' -I "$compressor" -Pcf "$backupFileName" -C / $backupSourceDir $HOME/.ssh/authorized_keys $volumePaths; then
     echo "❌ Backup file creation failed"
     exit 1
   fi
@@ -157,7 +166,17 @@ remoteCommands="
   cp ~/.ssh/authorized_keys ~/.ssh/authorized_keys_backup;
 
   echo '🚸 Extracting backup file...';
-  if ! tar -Pxzf - -C /; then
+  # pick decompressor
+  if command -v pigz >/dev/null 2>&1; then
+    echo '✅ Using pigz for parallel decompression';
+    decompressor="pigz -dc"
+  else
+    echo 'ℹ️ pigz not found, using gzip';
+    decompressor="gzip -dc"
+  fi
+  
+  # run extraction
+  if ! $decompressor | tar -Px -C /; then
     echo '❌ Backup file extraction failed';
     exit 1;
   fi

From ad90a9bdf0c7f9f94fdbf6147a1cbb007332e613 Mon Sep 17 00:00:00 2001
From: Buleandra Cristian <cristian.buleandra@gmail.com>
Date: Sat, 8 Nov 2025 11:36:20 +0100
Subject: [PATCH 2/2] Fix pigz decompression, and suppress file-changed
 warnings while compressing

---
 migrate.sh | 31 ++++++++++++++++---------------
 1 file changed, 16 insertions(+), 15 deletions(-)

diff --git a/migrate.sh b/migrate.sh
index 62d548a..aab3819 100644
--- a/migrate.sh
+++ b/migrate.sh
@@ -94,11 +94,14 @@ if [ ! -f "$backupFileName" ]; then
   fi
 
   # shellcheck disable=SC2086
-  if ! tar --exclude='*.sock' -I "$compressor" -Pcf "$backupFileName" -C / $backupSourceDir $HOME/.ssh/authorized_keys $volumePaths; then
+  tar --exclude='*.sock' --warning=no-file-changed -I "$compressor" -Pcf "$backupFileName" \
+    -C / $backupSourceDir $HOME/.ssh/authorized_keys $volumePaths
+  rc=$?
+  if [ $rc -gt 1 ]; then
     echo "❌ Backup file creation failed"
     exit 1
   fi
-  echo "✅ Backup file created"
+  echo "✅ Backup file created (with change warnings suppressed)"
 else
   echo "🚸 Backup file already exists, skipping creation"
 fi
@@ -165,22 +168,20 @@ remoteCommands="
   echo '🚸 Saving existing authorized keys...';
   cp ~/.ssh/authorized_keys ~/.ssh/authorized_keys_backup;
 
-  echo '🚸 Extracting backup file...';
-  # pick decompressor
+  echo '🚸 Extracting backup file...'
   if command -v pigz >/dev/null 2>&1; then
-    echo '✅ Using pigz for parallel decompression';
-    decompressor="pigz -dc"
+    echo '✅ Using pigz for parallel decompression'
+    if ! tar -I pigz -Pxf - -C /; then
+      echo '❌ Backup file extraction failed'
+      exit 1
+    fi
   else
-    echo 'ℹ️ pigz not found, using gzip';
-    decompressor="gzip -dc"
-  fi
-  
-  # run extraction
-  if ! $decompressor | tar -Px -C /; then
-    echo '❌ Backup file extraction failed';
-    exit 1;
+    if ! tar -Pzxf - -C /; then
+      echo '❌ Backup file extraction failed'
+      exit 1
+    fi
   fi
-  echo '✅ Backup file extracted';
+  echo '✅ Backup file extracted'
 
   echo '🚸 Merging authorized keys...';
   cat ~/.ssh/authorized_keys_backup ~/.ssh/authorized_keys | sort | uniq > ~/.ssh/authorized_keys_temp;