Preparing the Source Package

#!/bin/bash

# Check the command line parameters and ensure that the absolute path to the source Nginx installation directory is provided.
if [ $# -ne 1 ]; then
     echo "Usage: $0 <source_nginx_install_dir>"
     exit 1
fi

source_nginx_dir="$1"
source_nginx_binary="$source_nginx_dir/sbin/nginx"
temp_dir="/home/nginx_mig_tmp"
source_nginx_tmp="$temp_dir/$(basename "$source_nginx_dir")"
migration_tar="nginx_migration.tar"

if [ ! -d "$source_nginx_dir" ]; then
     echo "The parameter entered is not a valid directory."
     echo "Usage: $0 <source_nginx_install_dir>"
     exit 1
fi

if [ ! -d "$source_nginx_dir/sbin" ]; then
    echo "The source Nginx installation path does not contain the sbin directory."
    echo "Usage: $0 <source_nginx_install_dir>"
    echo "Notice: This script only supports the source Nginx binary stored in \"<source_nginx_install_dir>/sbin\"."
    exit 1
fi

if [ ! -f "$source_nginx_binary" ]; then
    echo "The source Nginx binary file is not in $source_nginx_dir/sbin."
    echo "Usage: $0 <source_nginx_install_dir>"
    echo "Notice: This script only supports the source Nginx binary stored in \"<source_nginx_install_dir>/sbin\"."
    exit 1
fi

# Step 1: Create a temporary directory and copy the Nginx installation directory.
target_nginx_dir="$(dirname "$source_nginx_tmp")"
mkdir -p "$target_nginx_dir"
echo "Copying $source_nginx_dir to $target_nginx_dir ..."
if ! cp -rp "$source_nginx_dir" "$target_nginx_dir"; then
     echo "Failed to copy the Nginx installation directory"
     exit 1
fi
# Create a directory and compress the components outside the package.
source_related_dir="$source_nginx_tmp/sbin/source_related"
mkdir -p "$source_related_dir"
mkdir -p "$source_related_dir/external_confs"
external_confs_record="$source_related_dir/external_confs/external_conf_record.txt"
touch "${external_confs_record}"
chmod 600 "${external_confs_record}"

# Step 2: Obtain and copy the dependency files specified in compilation options.
echo -e "\e[1;32m Getting installation configure command paths...\e[0m"
keywords="sbin-path|conf-path|error-log-path|http-log-path|http-client-body-temp-path|http-fastcgi-temp-path|http-proxy-temp-path|http-scgi-temp-path|http-uwsgi-temp-path|pid-path|lock-path"
cd "$source_nginx_dir"
strings "$source_nginx_binary" | grep "configure arguments"
strings "$source_nginx_binary" | grep "configure arguments" | grep -Eo "($keywords)=[^[:space:]]+" | awk -F '=' '{print $2}' | while read -r path; do
     # For dependency files already in the package, skip the copy operation.
     if [[ "$path" == "$source_nginx_dir"* ]]; then
         echo "Skip copying $path because it is in the source Nginx directory."
         continue
     fi

     source_path="$path"

     # Obtain the real path of the relative path.
     if [[ "$path" == ../* ]]; then
         source_path=$(realpath --relative-base="$source_nginx_dir" -m "$path")
     fi

     # For Nginx configuration and log files, copy the directory where the files are located.
     if [[ "$source_path" =~ \.conf$ ]] || [[ "$source_path" =~ \.log$ ]]; then
         source_path=$(dirname "$source_path")
     fi

     target_dir="$source_related_dir/$(dirname "$source_path")"
     if [ ! -d "$target_dir" ]; then
         mkdir -p "$target_dir"
     fi
     echo "Copying $source_path to $target_dir ..."
     if ! cp -rp "$source_path" "$target_dir"; then
         echo "Failed to copy file/directory: $source_path"
     fi
 done

# Step 3: Obtain and copy the startup configuration file.
echo " "
echo -e "\e[1;32m Getting startup config file...\e[0m"
ps -ef | grep nginx
nginx_process_info=$(ps -ef | grep nginx)
if grep -q " -c " <<< "$nginx_process_info" || [ -f "$source_nginx_binary" ]; then
    keywords=""
else
  echo -e "\e[1;93m Please refer to the process information of 'ps -ef | grep nginx' above, check whether the source nginx to be migrated is started with a specified configuration file. \e[0m"
  echo -e "\e[1;93m e.g., nginx: master process {path to the nginx binary to be migrated} -c {configuration file path} \e[0m"
  echo -e "\e[1;93m If it is not started based on the specified configuration file, press Enter to skip this step. Otherwise, enter the Nginx binary file path. \e[0m"
  echo "Enter Nginx binary path: "
  read -r nginx_binary_path
  keywords="$nginx_binary_path"
fi
ps -ef | grep nginx | grep -oE "nginx: master process $keywords \-c ([^ ]+)" | while read -r line; do
     CONF_FILE=$(echo "$line" | grep -oE 'c ([^ ]+)' | cut -d ' ' -f2)
     echo "[Startup config file]: $CONF_FILE"
     if [ ! -f "$CONF_FILE" ]; then
         continue
     fi
     conf_dir=$(dirname "$CONF_FILE")
     # If the file is already in the package, skip this step.
     if [[ "$conf_dir" == "$source_nginx_dir"* ]]; then
         continue
     fi

     echo "$CONF_FILE" >> "$external_confs_record"

     target_dir=$(dirname "$source_related_dir$conf_dir")
     if [ ! -d "$target_dir" ]; then
         mkdir -p "$target_dir"
     fi
     echo "Copying $conf_dir to $target_dir ..."
     if ! cp -rp "$conf_dir" "$target_dir"; then
         echo "Failed to copy confs dir: $conf_dir"
     fi
 done

# Step 4: Scan and copy the external files and directories referenced in the configuration file.
echo " "
echo -e "\e[1;32m Scanning included sources in config file...\e[0m"
conf_file_list=()
while IFS= read -r -d '' file; do
     conf_file_list+=("$file")
done < <(find "$source_nginx_tmp" -type f -name "*.conf" -print0)

# Input parameter: [line][relative_base_path]
function handle_included() {
     line="$1"
     relative_base_path="$2"
     path=$(echo "$line" | awk '{print $2}' | sed 's/[";]//g')

     if [[ "$path" == /* ]]; then
         source_path="$path"
         target_path="$source_related_dir$source_path"
     elif [[ "$path" == ../* ]]; then
         source_path=$(realpath --relative-base="$relative_base_path" -m "$path")
         target_path="$source_related_dir$source_path"
     else
         return
     fi

     if [[ "${path##*/}" == \** ]]; then
         source_path=$(dirname "$source_path")
         target_path=$(dirname "$target_path")
     fi

     target_dir=$(dirname "$target_path")
     mkdir -p "$target_dir"
     echo "Copying $source_path to $target_dir ..."
     if ! cp -rp "$source_path" "$target_dir"; then
         echo "Failed to copy file/directory: $path"
     fi
}

for file in "${conf_file_list[@]}"; do
     echo "[conf file]: $file"
     file_dir=$(dirname "$file")
     if [ ! -f "$file" ]; then
         continue
     fi
     # Obtain the directory of the source configuration file.
     if echo "$file" | grep -q "source_related"; then
         source_conf_dir=$(echo "$file_dir" | awk -F 'source_related' '{print $2}')
     else
         source_conf_dir="$source_nginx_dir/conf"
     fi
     # Configuration file directory
     keywords="include|ssl_certificate|ssl_certificate_key|ssl_dhparam"
     cd "$source_conf_dir"
     grep -wE "^[[:space:]]*($keywords)" "$file" | while read -r line; do
         handle_included "$line" "$source_conf_dir"
     done
     # Relative installation path
     keywords="error_log|access_log|root|alias|client_body_temp_path|fastcgi_temp_path|proxy_temp_path|proxy_cache_path|scgi_temp_path|uwsgi_temp_path"
     cd "$source_nginx_dir"
     grep -wE "^[[:space:]]*($keywords)" "$file" | while read -r line; do
         handle_included "$line" "$source_nginx_dir"
     done
 done

# Step 5: In the source_related directory, clear the source Nginx installation directory copied in step 3.
echo " "
cd "$(dirname "$temp_dir")"
source_related_nginx="$source_related_dir$source_nginx_dir"
if [ -d "$source_related_nginx" ]; then
     echo "[remove]: $source_related_nginx"
     rm -rf "${source_related_nginx}"
fi

# Step 6: Package the source component directory.
echo " "
echo -e "\e[1;32m Packing tar...\e[0m"
tar cvf "$migration_tar" "$(basename "$temp_dir")" >/dev/null
if [[ "$?" -ne "${SUCCESS}" ]]; then
     echo "Failed to create tar."
     exit 1
fi

echo "Nginx related components are packaged into $migration_tar."
echo "Note: Please manually check and remove unrelated files/dirs if needed."
echo "Please manually upload it to the node server and extract it using the command: tar xvf $migration_tar -C /custom_path"