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/etc is also writable, but it’s managed a bit differently. OSTree uses a technique called “etc overlay” to handle modifications in /etc. When an update is applied, OSTree compares files in the new version with those in /etc and applies changes intelligently, preserving local modifications as much as possible.
，这一点在Line官方版本下载中也有详细论述
❯ ls /usr/etc/motd
// 优化点：仅i<len时赋值（避免重复赋值，提升效率）
英國超市將巧克力鎖進防盜盒阻止「訂單式」偷竊