Stephen StaffordBBC News, South
// ⚠️ 易错点8：长度计算公式写错（比如right-left 或 right-left-1）
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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.