use update.sh to update safely

.update.sh

@@ -0,0 +1,25 @@
+#!/bin/bash
+
+export DOTFILES=$( cd "$( dirname "${BASH_SOURCE[0]:-${(%):-%x}}" )" && pwd )
+# get the specified commit id
+dfs_commit=$(curl -fsSL https://api.beardic.cn/get-dfs-commit)
+if [[ ${#dfs_commit} != 40 ]]; then
+    echo "Error: invalid commit id."
+    exit
+fi
+# fetch origin
+cd $DOTFILES
+git fetch
+if [[ -n "$(git status -s)" ]]; then
+    echo "Error: directory not clean."
+    exit
+fi
+# update
+if [[ "$(git rev-parse HEAD)" == "$dfs_commit" ]]; then
+    echo "Nothing to do."
+else
+    echo "Checking out to commit $dfs_commit ..."
+    git checkout $dfs_commit
+    cp ./.update.sh ./update.sh
+    chmod +x ./update.sh
+fi

.zshrc2

@@ -80,7 +80,7 @@ fi
 dfs()
 {
 	case $1 in
-		update ) (cd "$DOTFILES" && git pull) ;;
+		update ) $DOTFILES/update.sh ;;
 		force-update ) (cd "$DOTFILES" && git fetch --all && git reset --hard origin/main && git pull) ;;
 		reset  ) 
 			antigen reset 1> /dev/null

install.sh

@@ -96,7 +96,7 @@ if [[ ! $dotfile_path == ${home_slashes}* ]]; then
 fi
 dotfile_home_path=${dotfile_path/${home_slashes}/\~}
 dotfile_relative_path=${dotfile_path#${home_slashes}\/}
-crontab_job="0 * * * * cd ${dotfile_path} && env git pull"
+crontab_job="0 * * * * ${dotfile_path}/update.sh"
 
 ask_for_yN()
 {
@@ -209,7 +209,16 @@ install_vim_vundle(){
     fi
 }
 
+install_update(){
+    fmt_note "installing update.sh ..."
+    cp "${dotfile_path}/.update.sh" "${dotfile_path}/update.sh"
+    chmod +x "${dotfile_path}/update.sh"
+    fmt_note "running update.sh ..."
+    ${dotfile_path}/update.sh
+}
+
 install(){
+    install_update
     install_crontab
     insert_if_not_exist "${HOME}/.zshrc" "source ${dotfile_home_path}/.zshrc2"
     insert_if_not_exist "${HOME}/.tmux.conf" "source-file ${dotfile_home_path}/.tmux.conf2"