From 1d46fd1ec64cad5a082f0f1374d9faeda70a3d1d Mon Sep 17 00:00:00 2001
From: h7x4 <h7x4@nani.wtf>
Date: Thu, 29 Jan 2026 14:12:14 +0900
Subject: [PATCH] bicep/{postgres,mysql}: keep multiple backups, point at
 latest with symlink

---
 hosts/bicep/services/mysql/backup.nix      | 22 ++++++++++++----------
 hosts/bicep/services/postgresql/backup.nix | 20 ++++++++++++--------
 2 files changed, 24 insertions(+), 18 deletions(-)

diff --git a/hosts/bicep/services/mysql/backup.nix b/hosts/bicep/services/mysql/backup.nix
index 91faa84..1fee265 100644
--- a/hosts/bicep/services/mysql/backup.nix
+++ b/hosts/bicep/services/mysql/backup.nix
@@ -44,20 +44,22 @@ in
     ];
 
     script = let
-      rotations = 1;
+      rotations = 2;
     in ''
-      set -eo pipefail
+      set -euo pipefail
 
-      mysqldump --all-databases | zstd --compress -9 --rsyncable -o "/var/lib/mysql-backups/mysql-dump.sql.zst"
+      OUT_FILE="$STATE_DIRECTORY/mysql-dump-$(date --iso-8601).sql.zst"
+
+      mysqldump --all-databases | zstd --compress -9 --rsyncable -o "$OUT_FILE"
+
+      rm "$STATE_DIRECTORY/mysql-dump-latest.sql.zst" ||:
+      ln -s -T "$OUT_FILE" "$STATE_DIRECTORY/mysql-dump-latest.sql.zst"
+
+      while [ $(find -type f "$STATE_DIRECTORY" -printf '.' | wc -c) -gt ${toString rotations} ]; do
+        rm $(find "$STATE_DIRECTORY" -type f -printf '%T+ %p\n' | sort | head -n 1 | cut -d' ' -f2)
+      done
     '';
 
-    # NOTE: keep multiple backups and symlink latest one once we have more disk again
-    # mysqldump --all-databases | zstd --compress -9 --rsyncable -o "${backupDir}/$(date --iso-8601)-dump.sql.zst"
-
-    # while [ $(ls -1 "${backupDir}" | wc -l) -gt ${toString rotations} ]; do
-    #   rm $(find "${backupDir}" -type f -printf '%T+ %p\n' | sort | head -n 1 | cut -d' ' -f2)
-    # done
-
     serviceConfig = {
       Type = "oneshot";
       User = "mysql";
diff --git a/hosts/bicep/services/postgresql/backup.nix b/hosts/bicep/services/postgresql/backup.nix
index 151fa52..5ef7f9f 100644
--- a/hosts/bicep/services/postgresql/backup.nix
+++ b/hosts/bicep/services/postgresql/backup.nix
@@ -45,18 +45,22 @@ in
     ];
 
     script = let
-      rotations = 1;
+      rotations = 2;
     in ''
-      set -eo pipefail
+      set -euo pipefail
 
-      pg_dumpall -U postgres | zstd --compress -9 --rsyncable -o "/var/lib//postgresql-backups/postgresql-dump.sql.zstd"
+      OUT_FILE="$STATE_DIRECTORY/postgresql-dump-$(date --iso-8601).sql.zst"
+
+      pg_dumpall -U postgres | zstd --compress -9 --rsyncable -o "$OUT_FILE"
+
+      rm "$STATE_DIRECTORY/postgresql-dump-latest.sql.zst" ||:
+      ln -s -T "$OUT_FILE" "$STATE_DIRECTORY/postgresql-dump-latest.sql.zst"
+
+      while [ $(find -type f "$STATE_DIRECTORY" -printf '.' | wc -c) -gt ${toString rotations} ]; do
+        rm $(find "$STATE_DIRECTORY" -type f -printf '%T+ %p\n' | sort | head -n 1 | cut -d' ' -f2)
+      done
     '';
 
-    # pg_dumpall -U postgres | zstd --compress -9 --rsyncable -o "${backupDir}/$(date --iso-8601)-dump.sql.zst"
-    # while [ $(ls -1 "${backupDir}" | wc -l) -gt ${toString rotations} ]; do
-    #   rm $(find "${backupDir}" -type f -printf '%T+ %p\n' | sort | head -n 1 | cut -d' ' -f2)
-    # done
-
     serviceConfig = {
       Type = "oneshot";
       User = "postgres";