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mailserver: sync notmuch tags to Maildir flags after muchsync
muchsync writes tags directly to the xapian database, bypassing
notmuch's synchronize_flags. This means read/unread status from
mutt never gets reflected in Maildir filenames, so Dovecot (IMAP)
still shows messages as unread.
Add a systemd path unit that watches the notmuch xapian directory
and renames files to add/remove the S (Seen) flag based on the
notmuch unread tag.
author
lassulus
date
(Mar 18, 2026, 10:49 AM CET)
commit
3f9526f2
3f9526f2ee548db5108e811b5508bfa23a978ead
parent
d6c04de0
d6c04de0be7c830f3d21009e31104489b774f4d8
+44
+44
2configs/mailserver.nix
+44
2configs/mailserver.nix
···
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pkgs.muchsync
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pkgs.msmtp
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];
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# After muchsync writes tags to notmuch DB, the Maildir filenames don't get updated
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# (muchsync bypasses notmuch's flag sync). This watches the xapian DB for changes and
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# renames files to add/remove the S (Seen) flag based on the notmuch unread tag.
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systemd.paths.notmuch-flag-sync = {
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wantedBy = [ "multi-user.target" ];
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pathConfig.PathChanged = "/var/vmail/lassul.us/lass/mail/.notmuch/xapian";
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};
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systemd.services.notmuch-flag-sync = {
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description = "Sync notmuch tags to Maildir flags after muchsync";
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serviceConfig = {
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Type = "oneshot";
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User = "lass";
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Group = "virtualMail";
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ExecStart = pkgs.writeShellScript "notmuch-flag-sync" ''
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export NOTMUCH_CONFIG="${
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self.packages.${pkgs.system}.notmuch.passthru.configuration.configFile.path
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}"
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# Add S flag to files notmuch considers read but that lack it
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${pkgs.notmuch}/bin/notmuch search --output=files 'NOT tag:unread' \
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| ${pkgs.gnugrep}/bin/grep -v ',.*S' \
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| ${pkgs.gnugrep}/bin/grep '/cur/' \
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| while IFS= read -r f; do
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[ -f "$f" ] || continue
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base="''${f%:2,*}"
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flags="''${f##*:2,}"
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mv "$f" "''${base}:2,''${flags}S"
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done
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# Remove S flag from files notmuch considers unread but that have it
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${pkgs.notmuch}/bin/notmuch search --output=files 'tag:unread' \
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| ${pkgs.gnugrep}/bin/grep ',.*S' \
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| ${pkgs.gnugrep}/bin/grep '/cur/' \
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| while IFS= read -r f; do
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[ -f "$f" ] || continue
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base="''${f%:2,*}"
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flags="''${f##*:2,}"
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newflags="$(echo "$flags" | ${pkgs.gnused}/bin/sed 's/S//g')"
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mv "$f" "''${base}:2,''${newflags}"
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done
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# Update notmuch DB with the renames
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${pkgs.notmuch}/bin/notmuch new --quiet 2>/dev/null || true
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'';
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};
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};
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}