WIP: dovecot: add tmpfs for storing dovecot.index.cache in RAM

chatmaild/src/chatmaild/config.py

@@ -54,6 +54,7 @@ def __init__(self, inipath, params):
         self.privacy_mail = params.get("privacy_mail")
         self.privacy_pdo = params.get("privacy_pdo")
         self.privacy_supervisor = params.get("privacy_supervisor")
+        self.tmpfs_cache = params.get("tmpfs_cache", "false").lower() == "true"
 
         # deprecated option
         mbdir = params.get("mailboxes_dir", f"/home/vmail/mail/{self.mail_domain}")

chatmaild/src/chatmaild/doveauth.py

@@ -142,6 +142,8 @@ def lookup_passdb(self, addr, cleartext_password):
 
         user.set_password(encrypt_password(cleartext_password))
         print(f"Created address: {addr}", file=sys.stderr)
+        if self.config.tmpfs_cache:
+            os.symlink(f"{user.maildir}/dovecot.index.cache", f"/tmp{user.maildir}/")
         return user.get_userdb_dict()
 
 

chatmaild/src/chatmaild/ini/chatmail.ini.f

@@ -45,6 +45,9 @@
 # (space-separated, item may start with "@" to whitelist whole recipient domains)
 passthrough_recipients = echo@{mail_domain}
 
+# store cache files in tmpfs (good for disk size, bad for ram)
+tmpfs_cache = false
+
 # path to www directory - documented here: https://github.com/chatmail/relay/#custom-web-pages
 #www_folder = www
 

chatmaild/src/chatmaild/ini/override-testrun.ini

@@ -1,3 +1,6 @@
+[params]
+
+tmpfs_cache = true
 
 [privacy]
 

cmdeploy/src/cmdeploy/deployers.py

@@ -444,8 +444,8 @@ class ChatmailDeployer(Deployer):
         ("iroh", None, None),
     ]
 
-    def __init__(self, mail_domain):
-        self.mail_domain = mail_domain
+    def __init__(self, config):
+        self.config = config
 
     def install(self):
         apt.update(name="apt update", cache_time=24 * 3600)
@@ -471,9 +471,23 @@ def configure(self):
         server.shell(
             name="Setup /etc/mailname",
             commands=[
-                f"echo {self.mail_domain} >/etc/mailname; chmod 644 /etc/mailname"
+                f"echo {self.config.mail_domain} >/etc/mailname; chmod 644 /etc/mailname"
             ],
         )
+        if config.tmpfs_cache:
+            files.put(
+                src=get_resource("service/tmp.mount"),
+                dest="/etc/systemd/system/tmp.mount",
+            )
+
+    def activate(self):
+        if config.tmpfs_cache:
+            systemd.service(
+                name="Start and enable tmpfs mount",
+                service="tmp.mount",
+                running=True,
+                enabled=True,
+            )
 
 
 class FcgiwrapDeployer(Deployer):
@@ -556,7 +570,7 @@ def deploy_chatmail(config_path: Path, disable_mail: bool) -> None:
     tls_domains = [mail_domain, f"mta-sts.{mail_domain}", f"www.{mail_domain}"]
 
     all_deployers = [
-        ChatmailDeployer(mail_domain),
+        ChatmailDeployer(config),
         LegacyRemoveDeployer(),
         JournaldDeployer(),
         UnboundDeployer(),

cmdeploy/src/cmdeploy/service/tmp.mount

@@ -0,0 +1,16 @@
+[Unit]
+Description=Temporary Directory /tmp
+Documentation=https://systemd.io/TEMPORARY_DIRECTORIES
+Documentation=man:file-hierarchy(7)
+Documentation=https://systemd.io/API_FILE_SYSTEMS
+ConditionPathIsSymbolicLink=!/tmp
+DefaultDependencies=no
+Conflicts=umount.target
+Before=local-fs.target umount.target
+After=swap.target
+
+[Mount]
+What=tmpfs
+Where=/tmp
+Type=tmpfs
+Options=mode=1777,strictatime,nosuid,nodev,size=50%%,nr_inodes=1m,x-systemd.graceful-option=usrquota