feat: add shared library (lib/common.sh)
17 functions: logging (info/warn/error/success/step/phase_header), env management (load_env/save_env_var/require_vars), SSH wrappers (ssh_exec/ssh_check/scp_to), API wrappers (gitea_api/gitea_backup_api/ github_api), template rendering, and polling (wait_for_http/wait_for_ssh). All logs go to stderr, JSON data to stdout. Shellcheck clean. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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lib/common.sh
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290
lib/common.sh
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#!/usr/bin/env bash
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# =============================================================================
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# lib/common.sh — Shared functions for Gitea Migration Toolkit
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# Source this file in every script: source "$(dirname "$0")/lib/common.sh"
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# =============================================================================
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# This file defines functions only. No side effects at source time.
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# ---------------------------------------------------------------------------
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# Colors (only if stderr is a terminal)
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# ---------------------------------------------------------------------------
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if [[ -t 2 ]]; then
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_C_RESET='\033[0m'
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_C_RED='\033[0;31m'
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_C_GREEN='\033[0;32m'
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_C_YELLOW='\033[0;33m'
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_C_BLUE='\033[0;34m'
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_C_BOLD='\033[1m'
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else
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_C_RESET='' _C_RED='' _C_GREEN='' _C_YELLOW='' _C_BLUE='' _C_BOLD=''
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fi
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# ---------------------------------------------------------------------------
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# Logging — all output to stderr so stdout stays clean for data (JSON, etc.)
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# ---------------------------------------------------------------------------
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log_info() {
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printf '%b[INFO]%b %s\n' "$_C_BLUE" "$_C_RESET" "$*" >&2
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}
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log_warn() {
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printf '%b[WARN]%b %s\n' "$_C_YELLOW" "$_C_RESET" "$*" >&2
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}
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log_error() {
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printf '%b[ERROR]%b %s\n' "$_C_RED" "$_C_RESET" "$*" >&2
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}
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log_success() {
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printf '%b[OK]%b %s\n' "$_C_GREEN" "$_C_RESET" "$*" >&2
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}
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log_step() {
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local step_num="$1"; shift
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printf ' %b[%s]%b %s\n' "$_C_BOLD" "$step_num" "$_C_RESET" "$*" >&2
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}
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phase_header() {
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local num="$1" name="$2"
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printf '\n%b=== Phase %s: %s ===%b\n\n' "$_C_BOLD" "$num" "$name" "$_C_RESET" >&2
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}
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# ---------------------------------------------------------------------------
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# Environment
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# ---------------------------------------------------------------------------
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# Resolve the project root (directory containing .env / .env.example)
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_project_root() {
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local dir
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dir="$(cd "$(dirname "${BASH_SOURCE[1]:-${BASH_SOURCE[0]}}")/.." && pwd)"
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# Walk up until we find .env or .env.example
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while [[ "$dir" != "/" ]]; do
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if [[ -f "$dir/.env" ]] || [[ -f "$dir/.env.example" ]]; then
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printf '%s' "$dir"
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return 0
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fi
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dir="$(dirname "$dir")"
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done
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# Fallback: script's parent dir
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cd "$(dirname "${BASH_SOURCE[1]:-${BASH_SOURCE[0]}}")/.." && pwd
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}
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load_env() {
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local env_file
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env_file="$(_project_root)/.env"
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if [[ ! -f "$env_file" ]]; then
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log_error ".env file not found at $env_file"
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log_error "Copy .env.example to .env and populate values."
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return 1
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fi
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set -a
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# shellcheck source=/dev/null
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source "$env_file"
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set +a
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}
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save_env_var() {
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local key="$1" value="$2"
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local env_file
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env_file="$(_project_root)/.env"
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if [[ ! -f "$env_file" ]]; then
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log_error ".env file not found at $env_file"
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return 1
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fi
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# Escape special characters in value for sed
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local escaped_value
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escaped_value=$(printf '%s' "$value" | sed 's/[&/\]/\\&/g')
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if grep -q "^${key}=" "$env_file"; then
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# Replace existing line — match KEY= followed by anything (value + optional comment)
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sed -i.bak "s|^${key}=.*|${key}=${escaped_value}|" "$env_file"
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rm -f "${env_file}.bak"
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else
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# Append new line
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printf '%s=%s\n' "$key" "$value" >> "$env_file"
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fi
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# Also export it in current shell
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export "${key}=${value}"
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}
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require_vars() {
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local var
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for var in "$@"; do
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if [[ -z "${!var:-}" ]]; then
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log_error "Missing required var: $var"
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return 1
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fi
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done
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}
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# ---------------------------------------------------------------------------
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# SSH
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# ---------------------------------------------------------------------------
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ssh_exec() {
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local host_key="$1"; shift
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local cmd="$*"
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local ip_var="${host_key}_IP"
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local user_var="${host_key}_SSH_USER"
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local port_var="${host_key}_SSH_PORT"
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local ip="${!ip_var:-}"
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local user="${!user_var:-}"
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local port="${!port_var:-22}"
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if [[ -z "$ip" ]] || [[ -z "$user" ]]; then
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log_error "SSH config incomplete for $host_key: ${ip_var}=${ip:-<empty>}, ${user_var}=${user:-<empty>}"
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return 1
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fi
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ssh -o ConnectTimeout=10 \
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-o StrictHostKeyChecking=accept-new \
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-o BatchMode=yes \
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-p "$port" \
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"${user}@${ip}" \
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"$cmd"
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}
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ssh_check() {
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local host_key="$1"
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ssh_exec "$host_key" "true" 2>/dev/null
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}
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scp_to() {
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local host_key="$1" src="$2" dst="$3"
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local ip_var="${host_key}_IP"
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local user_var="${host_key}_SSH_USER"
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local port_var="${host_key}_SSH_PORT"
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local ip="${!ip_var:-}"
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local user="${!user_var:-}"
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local port="${!port_var:-22}"
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if [[ -z "$ip" ]] || [[ -z "$user" ]]; then
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log_error "SCP config incomplete for $host_key"
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return 1
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fi
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scp -o ConnectTimeout=10 \
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-o StrictHostKeyChecking=accept-new \
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-o BatchMode=yes \
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-P "$port" \
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"$src" "${user}@${ip}:${dst}"
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}
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# ---------------------------------------------------------------------------
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# API wrappers — return JSON on stdout, logs go to stderr
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# ---------------------------------------------------------------------------
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_api_call() {
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local base_url="$1" token="$2" method="$3" path="$4" data="${5:-}"
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local http_code
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local tmpfile
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tmpfile=$(mktemp)
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local -a curl_args=(
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-s
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-X "$method"
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-H "Authorization: token ${token}"
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-H "Content-Type: application/json"
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-H "Accept: application/json"
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-o "$tmpfile"
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-w "%{http_code}"
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)
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if [[ -n "$data" ]]; then
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curl_args+=(-d "$data")
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fi
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http_code=$(curl "${curl_args[@]}" "${base_url}${path}") || {
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log_error "curl failed for $method ${base_url}${path}"
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rm -f "$tmpfile"
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return 1
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}
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if [[ "$http_code" -ge 400 ]]; then
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log_error "API $method ${path} returned HTTP ${http_code}"
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log_error "Response: $(cat "$tmpfile")"
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rm -f "$tmpfile"
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return 1
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fi
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cat "$tmpfile"
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rm -f "$tmpfile"
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}
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gitea_api() {
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local method="$1" path="$2" data="${3:-}"
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_api_call "${GITEA_INTERNAL_URL}/api/v1" "${GITEA_ADMIN_TOKEN}" "$method" "$path" "$data"
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}
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gitea_backup_api() {
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local method="$1" path="$2" data="${3:-}"
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_api_call "${GITEA_BACKUP_INTERNAL_URL}/api/v1" "${GITEA_BACKUP_ADMIN_TOKEN}" "$method" "$path" "$data"
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}
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github_api() {
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local method="$1" path="$2" data="${3:-}"
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_api_call "https://api.github.com" "${GITHUB_TOKEN}" "$method" "$path" "$data"
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}
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# ---------------------------------------------------------------------------
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# Templates
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# ---------------------------------------------------------------------------
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render_template() {
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local src="$1" dest="$2"
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if [[ ! -f "$src" ]]; then
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log_error "Template not found: $src"
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return 1
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fi
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envsubst < "$src" > "$dest"
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}
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# ---------------------------------------------------------------------------
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# Polling / waiting
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# ---------------------------------------------------------------------------
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wait_for_http() {
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local url="$1" max_secs="${2:-60}"
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local elapsed=0
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log_info "Waiting for HTTP 200 at ${url} (timeout: ${max_secs}s)..."
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while [[ $elapsed -lt $max_secs ]]; do
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if curl -sf -o /dev/null "$url" 2>/dev/null; then
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log_success "HTTP 200 at ${url} (after ${elapsed}s)"
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return 0
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fi
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sleep 2
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elapsed=$((elapsed + 2))
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done
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log_error "Timeout waiting for ${url} after ${max_secs}s"
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return 1
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}
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wait_for_ssh() {
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local host_key="$1" max_secs="${2:-60}"
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local elapsed=0
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log_info "Waiting for SSH to ${host_key} (timeout: ${max_secs}s)..."
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while [[ $elapsed -lt $max_secs ]]; do
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if ssh_check "$host_key"; then
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log_success "SSH to ${host_key} connected (after ${elapsed}s)"
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return 0
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fi
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sleep 2
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elapsed=$((elapsed + 2))
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done
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log_error "Timeout waiting for SSH to ${host_key} after ${max_secs}s"
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return 1
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}
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