WARNING

注意：腳本原文件來源于網絡，部分修改只在小范圍測試過，請在正式使用前做好備份、測試

目標

1. 編寫腳本，將vim，emacs等配置文件放置到內存中，調用速度更快
2. 使用launchctl開機自啟動1中的腳本

環境

• mac osx 10.14.6
• vim8 配置文件為?SpaceVim
• emacs 配置文件為?seagle0128

腳本

mount-ram-vim.sh 創建內存鏡像掛載點

#!/bin/sh

# This program has two feature.
#
# 1. Create a disk image on RAM.
# 2. Mount that disk image.
#
# Usage:
#   $0 <dir> <size>
#
#   size:
#     The `size' is a size of disk image (MB).
#
#   dir:
#     The `dir' is a directory, the dir is used to mount the disk image.
#
# See also:
#   - hdid(8)
#

mount_point=${1:-/Users/mac/vim_ram}
size=${2:-128}

mkdir -p $mount_point
if [ $? -ne 0 ]; then
    echo "The mount point didn't available." >&2
    exit $?
fi

sector=$(expr $size \* 1024 \* 1024 / 512)
device_name=$(hdid -nomount "ram://${sector}" | awk '{print $1}')
if [ $? -ne 0 ]; then
    echo "Could not create disk image." >&2
    exit $?
fi

newfs_hfs -v vim $device_name > /dev/null
if [ $? -ne 0 ]; then
    echo "Could not format disk image." >&2
    exit $?
fi

mount -o nobrowse,rw -t hfs $device_name $mount_point
# -o nobrowse : do not display mount device on Finder sidebar
if [ $? -ne 0 ]; then
    echo "Could not mount disk image." >&2
    exit $?
fi

unmount-ram-vim.sh 關機/重啟時卸載內存鏡像

#!/bin/sh

# This program has two features.
#
# 1. Unmount a disk image.
# 2. Detach the disk image from RAM.
#
# Usage:
#   $0 <dir>
#
#   dir:
#     The `dir' is a directory, the dir is mounting a disk image.
#
# See also:
#   - hdid(8)
#

mount_point=${1:-/Users/mac/vim_ram}
if [ ! -d "${mount_point}" ]; then
    echo "The mount point didn't available." >&2
    exit 1
fi
mount_point=$(cd $mount_point && pwd)

device_name=$(df "${mount_point}" 2>/dev/null | tail -1 | grep "${mount_point}" | cut -d' ' -f1)
if [ -z "${device_name}" ]; then
    echo "The mount point didn't mount disk image." >&2
    exit 1
fi

umount "${mount_point}"
if [ $? -ne 0 ]; then
    echo "Could not unmount." >&2
    exit $?
fi

hdiutil detach -quiet $device_name

vim2ram.sh 將spacevim配置文件移入、移出內存鏡像

#!/bin/sh
function start()
{
    backup=/Users/mac/.spacevim-backup
    link=/Users/mac/.SpaceVim
    volatile=/Users/mac/vim_ram/.SpaceVim-$USER

    IFS=
    set -efu

    cd ~/

    if [ ! -r $volatile ]; then
        mkdir -m0700 $volatile
    fi

    # link -> volatie does not exist
    if [ "$(readlink $link)" != "$volatile" ]; then
        # backup project at first
        mv $link $backup
        # create the link
        ln -s $volatile $link
    fi

    if [ -e $link/.unpacked ]; then
        echo "Sync .SpaceVim from memory to backup ..."
        rsync -avq --delete --exclude .unpacked $link/ $backup/
        echo "DONE!"
    else
        echo "Sync .SpaceVim from disk to memory ..."
        rsync -avq $backup/ $link/
        touch $link/.unpacked
        echo "DONE!"
    fi
}

function restore()
{
    echo "Moving .SpaceVim back to disk ..."
    backup=/Users/mac/.spacevim-backup
    link=/Users/mac/.SpaceVim
    volatile=/Users/mac/vim_ram/.SpaceVim-$USER
    cd ~/
    rm -f $link && mv $backup $link && rm -rf $volatile
    echo "DONE!"
}

if [ -z "$1" ];then
    echo "-------------------------------------------------------------"
    echo "Usage:"
    echo "  vim2ram start"
    echo "  vim2ram restore"
    echo "Default action is 'vim2ram start'. Now excute start..."
    start
    echo "-------------------------------------------------------------"
    exit 1
fi

if [ "$1" == "start" ];then
    start
else
    restore
fi

launchctl開機服務啟動

啟動腳本 boot-shutdown.sh

#!/bin/sh
#
# Author: Vincenzo D'Amore v.damore@gmail.com
# 20/11/2014
#

function shutdown()
{
  echo `date` " " `whoami` " Received a signal to shutdown"

  # INSERT HERE THE COMMAND YOU WANT EXECUTE AT SHUTDOWN
  # remember Moving .emacs.d from ram back to disk
  ##emacs#
  #sh /Users/mac/emacs-speedup-scripts/emacs2ram.sh restore
  #echo ".emacd.d restore from ram complete!"
  #sh /Users/mac/emacs-speedup-scripts/unmount-ram.sh
  #echo "unmount-ram complete!"

  ##vim#
  sh /Users/mac/emacs-speedup-scripts/vim2ram.sh restore
  echo "SpaceVim restore from ram complete!"
  sh /Users/mac/emacs-speedup-scripts/unmount-ram-vim.sh
  echo "unmount-ram-vim complete!"

  exit 0
}

function startup()
{
  echo `date` " " `whoami` " Starting..."

  # INSERT HERE THE COMMAND YOU WANT EXECUTE AT STARTUP
  ##emacs#
  #sleep 3
  #sh /Users/mac/emacs-speedup-scripts/mount-ram.sh
  #echo "mount-ram complete!"
  #sh /Users/mac/emacs-speedup-scripts/emacs2ram.sh
  #echo "move .emacs.d to ram complete!"

  #vim#
  sleep 3
  sh /Users/mac/emacs-speedup-scripts/mount-ram-vim.sh
  echo "mount-ram-vim complete!"
  sh /Users/mac/emacs-speedup-scripts/vim2ram.sh
  echo "move SpaceVim to ram complete!"

  tail -f /dev/null &
  wait $!
}

trap shutdown SIGTERM
trap shutdown SIGKILL

startup;

launchctl基礎概念

macOS開機啟動一般使用launchctl加載plist文件

plist文件放置處：

~/Library/LaunchAgents 由用戶自己定義的任務項
/Library/LaunchAgents 由管理員為用戶定義的任務項
/Library/LaunchDaemons 由管理員定義的守護進程任務項
/System/Library/LaunchAgents 由Mac OS X為用戶定義的任務項
/System/Library/LaunchDaemons 由Mac OS X定義的守護進程任務項

/System/Library和/Library和~/Library目錄的區別？

/System/Library目錄是存放Apple自己開發的軟件。
/Library目錄是系統管理員存放的第三方軟件。
~/Library/是用戶自己存放的第三方軟件。

LaunchDaemons和LaunchAgents的區別？

LaunchDaemons是用戶未登陸前就啟動的服務（守護進程）。
LaunchAgents是用戶登陸后啟動的服務（守護進程）。

launchctl基礎命令

本次配置plist文件在 ~/Library/LaunchAgents 目錄

launchctl load ~/Library/LaunchAgents/example.plist
# 卸載配置
launchctl unload ~/Library/LaunchAgents/example.plist
# 檢查語法是否正確
plutil ~/Library/LaunchAgents/example.plist
# 查看服務運行狀態
launchctl list

plist文件：

?

1.在~/Library/LaunchAgents 創建文件Vim2Ram.plist，內容為：

<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
    <key>Label</key>
    <string>boot_vim2ram</string>
    <key>Program</key>
    <string>/Users/mac/macosx-script-boot-shutdown/boot-shutdown.sh</string>
    <key>ProgramArguments</key>
    <array>
        <string>/Users/mac/macosx-script-boot-shutdown/boot-shutdown.sh</string>
    </array>
    <key>RunAtLoad</key>
    <true/>
    <key>WorkingDirectory</key>
    <string>/Users/mac/macosx-script-boot-shutdown/</string>
    <key>StandardOutPath</key>
    <string>/Users/mac/macosx-script-boot-shutdown/boot-shutdown.log</string>
    <key>StandardErrorPath</key>
    <string>/Users/mac/macosx-script-boot-shutdown/boot-shutdown.err</string>
    <key>ExitTimeOut</key>
    <integer>600</integer>
</dict>
</plist>

• /Users/mac/macosx-script-boot-shutdown/ 為自定義路徑，按需修改
• /Users/mac/macosx-script-boot-shutdown/boot-shutdown.err與log為自定義日志文件，可有可無
• /Users/mac/macosx-script-boot-shutdown/boot-shutdown.sh 即啟動腳本?1

效果

配置好plist之后，啟動 launchctl load -w Vim2RAM.plist

查看鏡像：
?

其他

• emacs處理邏輯類似，參照vim腳本修改即可
• 碰到plist報錯問題，可使用launchcontrol調試， 安裝命令為 brew cask install launchcontrol
  參考：https://stackoverflow.com/questions/34215527/what-does-launchd-status-78-mean-why-my-user-agent-not-running