A script for auto retry the `gitbook build` command.

retry_gitbook_build.sh

#!/bin/bash
# =============================================================================
#  Author: Chu-Siang Lai / chusiang.lai (at) gmail.com
#  Filename: retry_gitbook_build.sh
#  Modified: 2020-03-04 15:47
#  Description:
#    As the gitbook maintainer, I want to auto retry the "gitbook build" tasks,
#    so that we can reduce a lot of manual retry actions.
# =============================================================================


# Help.
if [[ "$1" == "-h" || "$1" == "--help" ]]; then
  echo 'Usage: retry_gitbook_build.sh "<build_type>"'
  echo
  echo '> The gitbook-cli support the html, epub, mobi and pdf types.'
  echo
  echo 'Example:'
  echo '  retry_gitbook_build.sh'
  echo '  retry_gitbook_build.sh html'
  echo '  retry_gitbook_build.sh epub'
  exit 0
fi

echo

# Define build type.
BUILD_TYPE=$1
BUILD_CMD="gitbook build"

if [[ "${BUILD_TYPE}" == "" || "${BUILD_TYPE}" == "html" ]]; then
  echo "==> Command: gitbook build"
  BUILD_TYPE="html"
  mkdir -p _book/
  echo
elif [[ ${BUILD_TYPE} == 'epub' || ${BUILD_TYPE} == 'mobi' || ${BUILD_TYPE} == 'pdf' ]]; then
  echo "==> Command: gitbook build ${BUILD_TYPE}"
  BUILD_CMD="gitbook ${BUILD_TYPE}"
  mkdir -p ${BUILD_TYPE}/
  echo
else
  echo "==> Something wrong, please check the args."
  echo
  exit
fi


# Loop for retry.
NUM="0"

while true; do
  echo "===> Run \"$BUILD_CMD\" .."
  echo $BUILD_CMD | sh

  if (("$?" == "0")); then
    echo
    echo "==> DONE. Retry $NUM time. Congratulation !"
    echo
    break
  else
    NUM=$[$NUM + 1]
    echo
    echo "===> Build failed, retry $NUM."
    sleep 10
  fi

done