Add Git object sizes script

git-repo-object-sizes.sh

@@ -0,0 +1,84 @@
+#!/usr/bin/env bash
+
+# Shows the largest object of a Git repository:
+# - Size
+# - Object ID
+# - Path
+# - Branch(es), the object
+#
+# Usage:
+#   ./git-biggest-objects.sh [NUMBER]
+#
+# Example:
+#   ./git-biggest-objects.sh 30
+
+set -euo pipefail
+
+COUNT="${1:-20}"
+
+if ! git rev-parse --git-dir >/dev/null 2>&1; then
+    echo "Fehler: Kein Git-Repository."
+    exit 1
+fi
+
+TMP_OBJECTS="$(mktemp)"
+TMP_BRANCHES="$(mktemp)"
+
+cleanup() {
+    rm -f "$TMP_OBJECTS" "$TMP_BRANCHES"
+}
+trap cleanup EXIT
+
+echo "Collecting objects ..."
+git rev-list --objects --all > "$TMP_OBJECTS"
+
+echo "Collecting branches ..."
+while read -r commit branches; do
+    for branch in $branches; do
+        echo "$commit $branch"
+    done
+done < <(
+    git for-each-ref \
+        --format='%(objectname) %(refname:short)' \
+        refs/heads
+) > "$TMP_BRANCHES"
+
+echo
+printf "%-12s %-40s %-50s %s\n" "SIZE" "OBJECT ID" "BRANCH" "PATH"
+printf "%-12s %-40s %-50s %s\n" "----" "---------" "------" "-----"
+
+git cat-file --batch-check='%(objectname) %(objecttype) %(objectsize)' < <(
+    awk '{print $1}' "$TMP_OBJECTS"
+) |
+awk '$2 == "blob"' |
+sort -k3 -n |
+tail -n "$COUNT" |
+while read -r object type size; do
+
+    path="$(grep "^$object " "$TMP_OBJECTS" | sed "s/^$object //")"
+
+    # Find commit(s) that contain(s) the object
+    commits="$(git log --all --find-object="$object" --format='%H' 2>/dev/null || true)"
+
+    branches=""
+
+    if [[ -n "$commits" ]]; then
+        while read -r commit; do
+            found_branches="$(git branch --contains "$commit" --format='%(refname:short)' 2>/dev/null || true)"
+            branches="${branches} ${found_branches}"
+        done <<< "$commits"
+    fi
+
+    # Remove duplicates
+    branches="$(echo "$branches" | tr ' ' '\n' | sort -u | tr '\n' ',' | sed 's/,$//')"
+
+    # Human-readable size
+    human_size="$(numfmt --to=iec-i --suffix=B "$size")"
+
+    printf "%-12s %-40s %-50s %s\n" \
+        "$human_size" \
+        "$object" \
+        "${branches:-?}" \
+        "$path"
+
+done | sort -h