home-manager debugging

2022-11-09

开机的时候home-manager-${user} 的service 报error的情况, 但是系统内rebuild switch 然后再查看状态又是正常active的, 而且使用没有影响

> journalctl  -f -eu home-manager-riro
Nov 08 21:08:12 hastur systemd[1]: Starting Home Manager environment for riro...
Nov 08 21:08:12 hastur hm-activate-riro[1122]: gpg-connect-agent: no running gpg-agent - starting '/nix/store/ws6mv7favvy0x43g1bi01qajrk6kp018-gnupg-2.3.7/bin/gpg-agent'
Nov 08 21:08:12 hastur hm-activate-riro[1122]: gpg-connect-agent: waiting for the agent to come up ... (5s)
Nov 08 21:08:12 hastur hm-activate-riro[1122]: gpg-connect-agent: connection to the agent established
Nov 08 21:08:12 hastur autossh[1148]: starting ssh (count 1)
Nov 08 21:08:12 hastur autossh[1148]: ssh child pid is 1155
Nov 08 21:08:12 hastur autossh[1157]: bind on 127.0.0.1:5679: Address already in use
Nov 08 21:08:12 hastur hm-activate-riro[1107]: Starting Home Manager activation
Nov 08 21:08:13 hastur hm-activate-riro[1107]: Activating checkFilesChanged
Nov 08 21:08:13 hastur hm-activate-riro[1107]: Activating checkLinkTargets
Nov 08 21:08:13 hastur autossh[1148]: ssh exited with error status 255; restarting ssh
Nov 08 21:08:13 hastur autossh[1148]: starting ssh (count 2)
Nov 08 21:08:13 hastur autossh[1148]: ssh child pid is 1366
Nov 08 21:08:13 hastur hm-activate-riro[1107]: Activating writeBoundary
Nov 08 21:08:13 hastur hm-activate-riro[1107]: Activating installPackages
Nov 08 21:08:13 hastur hm-activate-riro[1402]: replacing old 'home-manager-path'
Nov 08 21:08:13 hastur hm-activate-riro[1402]: installing 'home-manager-path'
Nov 08 21:08:13 hastur hm-activate-riro[1107]: Activating dconfSettings
Nov 08 21:08:13 hastur hm-activate-riro[1442]: dbus-run-session: failed to execute message bus daemon 'dbus-daemon': No such file or directory
Nov 08 21:08:13 hastur hm-activate-riro[1440]: dbus-run-session: EOF reading address from bus daemon
Nov 08 21:08:13 hastur systemd[1]: home-manager-riro.service: Main process exited, code=exited, status=127/n/a
Nov 08 21:08:13 hastur autossh[1148]: received signal to exit (15)
Nov 08 21:08:13 hastur systemd[1]: home-manager-riro.service: Failed with result 'exit-code'.
Nov 08 21:08:13 hastur systemd[1]: Failed to start Home Manager environment for riro.

之后尝试二分commit, 最终发现在本地仓库的 rebuild不行, 远端仓库的rebuild则没有报错,但本地和远端仓库的commit是完全同步的
使用本地仓库和远程仓库rebuild, 确认过没有问题, 但处在本地仓库(rebuild形成)的generation rebuild远端仓库或从远端仓库的generation rebuild 本地仓库会出现奇怪的现象，虽然呈现一定的相关性但是无法确认是不是这个行为直接导致的。日志显示 hm-user 的service重启了
按照正常情况, 两个完全同步的仓库rebuild出的outpath应该完全相同, 也就不会有服务的更改/重启

在 NixOS CN 群友的协助调试下, 发现问题

远端仓库的rebuild 受到 /root/.cache/nix 路径内容的不明影响, 把这个目录清空, 远端和本地仓库rebuild出的版本都出现了开机报错的提示.问题转换为符合预期的常规的配置文件错误
继续采用二分法查找出错的commit, 最后发现出错和正常的版本差别只有flake.lock, 基本可以排除是本地配置文件的错误, 大概率是nixpkgs上游的问题对比执行 nix flake update 更新到如分支last-work 所示的flake.lock 之后, 问题解决

破案

https://github.com/nix-community/home-manager/pull/3405

Thu 1 Jun 02:08:57 CST 2023 update