update remote bootstrap

bootstrap_remote.sh

 #!/bin/bash
-remote_command="cd ~; git -C .mysetting pull || git clone https://code.ihep.ac.cn/zhangxuantong/mysetting.git .mysetting; cd .mysetting; source bootstrap.sh git;"
+remote_command="cd ~; \
+  which git &>/dev/null || yum install -y git &>/dev/null; \
+  git -C .mysetting pull || git clone https://code.ihep.ac.cn/zhangxuantong/mysetting.git .mysetting; \
+  cd .mysetting; \
+  source bootstrap.sh git;"
 host_list="src/hostlist.txt"
 
-while IFS= read -r remote_host
-do
+for remote_host in $(cat src/hostlist.txt); do
   if [[ "${remote_host:0:1}" != "#" ]]; then
     echo "Executing on $remote_host ..."
-    ssh-copy-id root@$remote_host &>/dev/null
-    ssh root@$remote_host "$remote_command"
+    ssh-copy-id root@$remote_host && ssh root@$remote_host "$remote_command"
     echo "Finished $remote_host ..."
   fi
-done < $host_list
+done