First zfs scripts

2026-06-02 14:56:58 +02:00 · 2026-04-18 00:30:13 +02:00
parent 72bbf86921
commit 74f381cc1c
3 changed files with 441 additions and 0 deletions
@@ -0,0 +1,118 @@
+#!/bin/bash
+
+if [ "$#" -lt 2 ]; then
+    echo "Compares the difference of two snapshots of the same dataset."
+    echo "If a file was modified, but has the same content, it will be skipped."
+    echo "Remaining files can be analysed more deeply using --singlefile mode."
+    echo
+    echo "Usage:"
+    echo "  - $0 <dataset>@<snap1> <dataset>@<snap2> [M+-]                  # scans files, default is modified only [M]"
+    echo "  - $0 <dataset>@<snap1> <dataset>@<snap2> --singlefile [path]    # deeper look at one file's differences"
+    exit 1
+fi
+
+SNAP1_FULL=$1
+SNAP2_FULL=$2
+TYPES_FILTER=${3:-M}
+TARGET_PATH=$4
+
+DATASET=${SNAP1_FULL%@*}
+SNAP1_NAME=${SNAP1_FULL#*@}
+SNAP2_NAME=${SNAP2_FULL#*@}
+
+MOUNTPOINT=$(zfs get -H -o value mountpoint "$DATASET")
+
+if [ "$MOUNTPOINT" == "none" ] || [ ! -d "$MOUNTPOINT" ]; then
+    echo "Failure: dataset is not accessable via its mountpoint."
+    exit 1
+fi
+
+[ "${#TYPES_FILTER}" -gt 3 ] && [ "$TYPES_FILTER" != "--singlefile" ] \
+    && [ -n "$TARGET_PATH"] \
+    && echo "Failure: Mode ${TYPES_FILTER} unknown." \
+    && exit 1
+
+[ "$TYPES_FILTER" == "--singlefile" ] \
+    && [ -z "$TARGET_PATH"] \
+    && echo "Failure: Mode --singlefile requires path." \
+    && exit 1
+
+
+
+if [ "$TYPES_FILTER" == "--singlefile" ] && [ -n "$TARGET_PATH" ]; then
+    rel_path=${TARGET_PATH#$MOUNTPOINT/}
+    file1="$MOUNTPOINT/.zfs/snapshot/$SNAP1_NAME/$rel_path"
+    file2="$MOUNTPOINT/.zfs/snapshot/$SNAP2_NAME/$rel_path"
+
+    echo "Vergleiche: $rel_path"
+    echo "Snapshot 1: $file1"
+    echo "Snapshot 2: $file2"
+    echo "--------------------------------------------------------"
+
+    if [ ! -f "$file1" ] && [ ! -f "$file2" ]; then
+        echo "Fehler: Datei existiert in beiden Snapshots nicht."
+        exit 1
+    fi
+
+    # Standard Diff (meldet 'Binary files differ' bei Binärdateien)
+    diff -u "$file1" "$file2"
+
+    # Alternativ: vimdiff (einfach die obere Zeile auskommentieren und hier das # entfernen)
+    # vimdiff "$file1" "$file2"
+
+    exit 0
+fi
+
+
+
+echo -e "Diff(Bytes)\tPfad"
+echo -e "--------------------------------------------------------"
+
+zfs diff -H "$SNAP1_FULL" "$SNAP2_FULL" | while IFS=$'\t' read -r type path; do
+
+    if [[ ! "$TYPES_FILTER" == *"$type"* ]]; then
+        continue
+    fi
+
+    rel_path=${path#$MOUNTPOINT/}
+    file1="$MOUNTPOINT/.zfs/snapshot/$SNAP1_NAME/$rel_path"
+    file2="$MOUNTPOINT/.zfs/snapshot/$SNAP2_NAME/$rel_path"
+
+    case "$type" in
+        "M")
+            if [ -f "$file1" ] && [ -f "$file2" ]; then
+                read -r size1 mtime1 < <(stat -c "%s %Y" "$file1")
+                read -r size2 mtime2 < <(stat -c "%s %Y" "$file2")
+                diff_val=$((size2 - size1))
+
+                if [ "$diff_val" -eq 0 ]; then
+                    [ "$mtime1" == "$mtime2" ] && continue
+                    hash_line1=$(sha1sum "$file1")
+                    sha1_1=${hash_line1%% *}
+                    hash_line2=$(sha1sum "$file2")
+                    sha1_2=${hash_line2%% *}
+                    [ "$sha1_1" == "$sha1_2" ] && continue
+                    echo -e "0\t\t${path}"
+                else
+                    echo -e "${diff_val}\t\t${path}"
+                fi
+            fi
+            ;;
+        "+")
+            if [ -f "$file2" ]; then
+                size2=$(stat -c%s "$file2")
+                echo -e "+${size2}\t\t${path}"
+            fi
+            ;;
+        "-")
+            if [ -f "$file1" ]; then
+                size1=$(stat -c%s "$file1")
+                echo -e "-${size1}\t\t${path}"
+            fi
+            ;;
+    esac
+done
+
+echo -e "--------------------------------------------------------"
+echo -e "Use the following command for a deeper look at one file:"
+echo -e "$0 $1 $2 --singlefile [Pfad]"