thepraandClaude Opus 5.5
12bb75809f
A backup is a directory <stamp>-<kind> under Backups:Root (/var/lib/privapub/backups, 2770, files 0640), written as .partial and renamed once whole: a manifest (host, build, newest migration, each collection's count, size, sha256 and indexes, what was left out and why, the media list), each collection as gzipped canonical Extended JSON read raw, and hard links to the files of untrashed media rows (copies where a link can't be made). On a replica set every collection is read in one snapshot session. Never in a backup: the statistics salt, jobs, recovery codes, sessions, the maintenance lock and the configuration's copy with its SMTP password. One backup or restore at a time (MaintenanceLock, a heartbeat document), and the janitor purges nothing meanwhile. BackupScheduler backs up nightly at 03:30 UTC (or at once after missing a night); rotation keeps 7 daily, 4 weekly, 3 pre-deploy and 3 pre-restore backups. CLI: admin backup [--kind] [--db-only], admin backups, admin backup verify; these run before migrations, so the deploy's own pre-deploy backup, which replaces mongodump, is of the database as the live build left it. EntityMaps.Warm runs once under a lock, since test hosts now boot side by side. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01LsXgEaXee4GCU1hwYgPJXw
36 lines
1.0 KiB
C#
36 lines
1.0 KiB
C#
using System.Runtime.InteropServices;
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namespace PrivaPub.Infrastructure.Backup
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{
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// A second name for a file (.NET has no API for it): a backup links the live media, which costs no disk, since names are
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// random and files never change; deleting the live one leaves the backup's.
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static class HardLink
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{
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// strings go to libc as UTF-8 on Unix
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[DllImport("libc", EntryPoint = "link", SetLastError = true, CharSet = CharSet.Ansi)]
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static extern int Link(string existing, string created);
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/// <summary>Links, or copies where a link can't be made (another disk, a filesystem refusing it).</summary>
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public static bool LinkOrCopy(string existing, string created)
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{
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Directory.CreateDirectory(Path.GetDirectoryName(created)!);
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if (OperatingSystem.IsLinux())
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{
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try
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{
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if (Link(existing, created) == 0)
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return true;
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}
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catch (DllNotFoundException)
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{
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}
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catch (EntryPointNotFoundException)
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{
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}
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}
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File.Copy(existing, created, overwrite: true);
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return false;
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}
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}
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}
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