jaysnote:lightdm
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jaysnote:lightdm [2018/12/28 17:54] jaylee |
jaysnote:lightdm [2021/06/22 23:14] |
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| - | # [LightDM Design](https:// | ||
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| - | ## 什么是DM？ | ||
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| - | DM（显示管理器）功能如下： | ||
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| - | * 启动和管理本地实例化的X Server； | ||
| - | * 用户认证； | ||
| - | * 启动和管理用户回话（常用情景）； | ||
| - | * 在boot过程中，单例启动X 服务器和开始一个用户会话（(kiosk mode)）； | ||
| - | * 在boot过程中，单例启动 X服务器，显示用户登录界面，在连接时启动用户会话； | ||
| - | * 支持多用户同时登录，用户选择具体用户登录，同时为每一个 用户启动 X 服务器； | ||
| - | * 允许 X 服务器，使用XDMCP，运行瘦客户端远程连接到其他X 服务器。 | ||
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| - | ## 设计目标 | ||
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| - | * 快速 | ||
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| - | 不增加其他额外的启动时间； | ||
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| - | * 异常安全 | ||
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| - | 处理所有 | ||
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| - | ## Definitions | ||
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| - | - Display Manager - A daemon that manages the displays on a system. | ||
| - | - Display - A combination of an X server, greeter and a user session. | ||
| - | - User session - An application that runs on a display and allows the user to run applications. | ||
| - | - Greeter - An application to run on a display and prompt for authentication and session options. | ||
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| - | ## Requirements | ||
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| - | Daemon: | ||
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| - | - Able to run as as system service without user interaction | ||
| - | - Provide logging information for debugging | ||
| - | - Launch and monitor X servers | ||
| - | - Launch and monitor greeter applications for displays without a user session | ||
| - | - Launch and monitor user sessions after user is authenticated | ||
| - | - Authenticate users | ||
| - | - Provide an interface to greeter applications | ||
| - | - Provide an interface to user switchers | ||
| - | - Store a database of active displays | ||
| - | - Load sessions from / | ||
| - | - Store session configuration in ~/.dmrc | ||
| - | - Support .dmrc not being readable before login | ||
| - | - Advertise display database to [Software/ | ||
| - | - Use PAM for authentication Session environment: | ||
| - | - Set USER to the username | ||
| - | - Set HOME to users home directory | ||
| - | - Set SHELL to the users shell | ||
| - | - Set PATH to / | ||
| - | - Set LANG to the users language | ||
| - | - Set DISPLAY to the X servers address | ||
| - | - Set environment variables from / | ||
| - | - Allow 0-N displays to be enabled at all time | ||
| - | - Support automatic/ | ||
| - | - Interface to switch to existing local display for a logged in user | ||
| - | - Start new static display if user not logged in XDMCP Server Module: | ||
| - | - Implement XDMCP protocol Module interface: | ||
| - | - Expose display database Greeter application/ | ||
| - | - User authentication | ||
| - | - Session choice | ||
| - | - Session language | ||
| - | - Session keyboard layout | ||
| - | - Logged in users | ||
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| - | ## Implementation | ||
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| - | Daemon: | ||
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| - | - Implemented in C+GObject | ||
| - | - Single process Greeter Interface: | ||
| - | - D-Bus GTK+ Greeter: | ||
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| - | ## Inter-process Relationships | ||
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除额外注明的地方外，本维基上的内容按下列许可协议发布： CC Attribution-Share Alike 4.0 International
