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services: matrix-conduit: use sqlite .backup command instead of .dump

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SQLite documents this [0] as the best way to perform backups on these
files [1], so use it.

[0] https://www.sqlite.org/backup.html
[1] https://www.sqlite.org/howtocorrupt.html#_backup_or_restore_while_a_transaction_is_active

Signed-off-by: Christoph Heiss <christoph@c8h4.io>
This commit is contained in:
Christoph Heiss 2024-03-14 22:27:41 +01:00
parent 05f4a4281c
commit e36e8d68ce
Signed by: c8h4
GPG key ID: 6817E9C75C0785D7
1 changed files with 6 additions and 4 deletions
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10
services/conduit.nix
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@ -117,17 +117,19 @@ in {
repository = "${resticCfg.repositoryBase}/${config.networking.hostName}";
passwordFile = "/var/secrets/restic/repo/${config.networking.hostName}";
paths = [
"/var/backup/matrix-conduit/conduit.sql.zst"
"/var/backup/matrix-conduit/conduit.db.zst"
"/var/lib/matrix-conduit/media"
];
timerConfig.OnCalendar = "*-*-* 4:05:00"; # daily at 04:05
backupPrepareCommand = ''
set -euo pipefail
umask 0077
f=$(mktemp)
# consistency is provided by the internal locking of sqlite
${pkgs.sqlite}/bin/sqlite3 /var/lib/matrix-conduit/conduit.db .dump \
| ${pkgs.zstd}/bin/zstd --compress -9 \
>/var/backup/matrix-conduit/conduit.sql.zst
${pkgs.sqlite}/bin/sqlite3 /var/lib/matrix-conduit/conduit.db ".backup $f"
${pkgs.zstd}/bin/zstd --compress -9 --rm --force \
-o /var/backup/matrix-conduit/conduit.db.zst $f
'';
backupCleanupCommand = my.mkResticBackupNotificationCmd {
name = "matrix-conduit";