Added doc for git clone optimizaton and script in config/rootfs/debos/scripts/git-operations.sh

Author: khanheric2003

config/rootfs/debos/scripts/git-operations.sh

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+#!/bin/bash
+# git-operations.sh - Standardized git operations for KernelCI rootfs builds
+
+# Optimized git clone function for CI environments
+# Usage: git_clone_optimized <repository_url> <target_dir> [branch] [depth]
+git_clone_optimized() {
+    local repo_url="$1"
+    local target_dir="$2"
+    local branch="${3:-}"
+    local depth="${4:-1}"
+    
+    if [ $# -lt 2 ]; then
+        echo "Usage: git_clone_optimized <repo_url> <target_dir> [branch] [depth]"
+        return 1
+    fi
+    
+    echo "Cloning $repo_url (depth: $depth) to $target_dir"
+    
+    # If no branch specified, let git choose the default
+    if [ -z "$branch" ]; then
+        echo "No branch specified, using repository default"
+        git clone \
+            --depth="$depth" \
+            --single-branch \
+            "$repo_url" \
+            "$target_dir"
+    else
+        echo "Using specified branch: $branch"
+        git clone \
+            --depth="$depth" \
+            --single-branch \
+            --branch="$branch" \
+            "$repo_url" \
+            "$target_dir"
+    fi
+}
+
+# Wrapper for backward compatibility
+git_clone() {
+    if [[ $# -eq 2 && -z "${3:-}" ]]; then
+        echo "Warning: Using deprecated git clone interface. Consider updating to git_clone_optimized"
+        git_clone_optimized "$1" "$2"
+    else
+        git_clone_optimized "$@"
+    fi
+}

doc/git_clone_optimization.md

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+## Overview
+
+This document establishes standardized git clone operations for KernelCI rootfs builder scripts to reduce network traffic and improve build performance in CI environments.
+
+## Problem Statement
+
+Rootfs builder scripts currently use inconsistent git clone approaches:
+
+```bash
+# Found patterns across scripts:
+git clone $BLKTEST_URL .                           # No optimization
+git clone --depth 1 $GSTREAMER_URL .               # Partial optimization  
+git clone --depth=1 $LIBCAMERA_URL .               # Different syntax
+git clone $DEQP_RUNNER_GIT_URL --single-branch --no-checkout  # Mixed approach
+git clone -b ${LTP_SHA} ${LTP_URL}                  # Branch-specific
+
+# Changed into format of this optimal git options
+git clone --depth=1 --single-branch [--branch=<branch>] <repository_url> <target_dir>
+# I can use it as 
+git_clone_optimized https://github.com/octocat/Hello-World.git hello-world-test
+

test-git-clone.sh

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+#!/bin/bash
+set -e
+
+echo "=== Testing Git Clone Optimization ==="
+
+# Check if git-operations.sh exists
+if [ ! -f "./config/rootfs/debos/scripts/git-operations.sh" ]; then
+    echo "Error: git-operations.sh not found!"
+    exit 1
+fi
+
+# Source our git operations function
+source ./config/rootfs/debos/scripts/git-operations.sh
+
+# Test the function with a small repository
+echo "Testing git_clone_optimized..."
+
+# Create a temporary directory for testing
+TEMP_DIR="/tmp/git-test-$$"
+mkdir -p "$TEMP_DIR"
+cd "$TEMP_DIR"
+
+echo "Temp directory: $TEMP_DIR"
+
+# Test with a small repository (auto-detect branch)
+echo "Cloning test repository (auto-detect default branch)..."
+if git_clone_optimized https://github.com/octocat/Hello-World.git hello-world-test; then
+    echo "✓ Clone successful"
+    
+    if [ -d "hello-world-test" ]; then
+        cd hello-world-test
+        echo "Commit count: $(git rev-list --count HEAD)"
+        echo "Current branch: $(git branch --show-current)"
+        echo "All branches: $(git branch -a)"
+        echo "Repository size: $(du -sh . | cut -f1)"
+        cd ..
+    fi
+    
+    # Cleanup
+    rm -rf hello-world-test
+    echo "✓ Test completed successfully"
+else
+    echo "✗ Clone failed"
+    exit 1
+fi
+
+# Cleanup temp directory
+cd /
+rm -rf "$TEMP_DIR"