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# Based on <https://gist.github.com/aanderse/3344baef2c3b86c8a1e98e63bd9256ea>
# See also:
# - <https://albert.cx/20181125-use-separate-systemd-units-for-php-fpm-pools>
# - <https://freedesktop.org/wiki/Software/systemd/DaemonSocketActivation/>
{
config,
lib,
pkgs,
...
}:
with lib; let
cfg = config.services.php-fpm-isolated;
configFile = {
pool,
poolOpts,
runtimeDir,
sockFile,
pidFile,
}: let
config = {
global = {
daemonize = false;
error_log = "syslog";
pid = pidFile;
};
"${pool}" = let
enforced = {
inherit (poolOpts) user group;
listen = sockFile;
};
defaults = {
"pm" = "dynamic";
"pm.max_children" = 16;
"pm.min_spare_servers" = 1;
"pm.max_spare_servers" = 4;
"pm.start_servers" = 1;
"catch_workers_output" = true;
"php_admin_flag[log_errors]" = true;
"env[PATH]" = makeBinPath [pkgs.php];
};
env =
mapAttrs'
(name: value: {
name = "env[${name}]";
value = "\"${escape ["\""] value}\"";
})
poolOpts.env;
in
defaults // poolOpts.config // env // enforced;
};
in
(pkgs.formats.ini {}).generate "php-fpm-pool-${pool}.conf" config;
in {
options.services.php-fpm-isolated.pools = mkOption {
default = {};
type = with types;
attrsOf (submodule {
options = {
enable = mkEnableOption "PHP-FPM pool";
user = mkOption {
type = str;
};
group = mkOption {
type = str;
};
unveil = mkOption {
type = listOf (either package str);
};
env = mkOption {
type = attrsOf str;
default = {};
};
config = mkOption {
type = attrsOf (oneOf [int str bool]);
default = {};
};
};
});
};
config.systemd = let
php-fpm = "${pkgs.php}/bin/php-fpm";
unitsFor = pool: poolOpts: let
runtimeBase = "php-fpm-isolated/${pool}";
runtimeDir = "/run/${runtimeBase}";
pidFile = "${runtimeDir}/${pool}.pid";
sockFile = "${runtimeDir}/${pool}.sock";
in {
name = "php-fpm-pool-${pool}";
value.service = {
description = "PHP-FPM process manager for pool '${pool}'";
after = ["network.target"];
confinement.enable = true;
serviceConfig = {
Type = "notify";
ExecReload = "${pkgs.coreutils}/bin/kill -USR2 $MAINPID";
PIDFile = pidFile;
Environment = "FPM_SOCKETS=${sockFile}=3";
ExecStart = let
fpmConfig = configFile {
inherit pool poolOpts runtimeDir sockFile pidFile;
};
in "${php-fpm} --nodaemonize --fpm-config ${fpmConfig} --pid ${pidFile}";
PrivateTmp = true;
PrivateNetwork = true;
PrivateDevices = true;
# XXX: We need AF_NETLINK to make the sendmail SUID binary from postfix work
RestrictAddressFamilies = "AF_UNIX AF_INET AF_INET6 AF_NETLINK";
User = poolOpts.user;
Group = poolOpts.group;
RuntimeDirectory = runtimeBase;
BindReadOnlyPaths = let
unveiled = map builtins.toString poolOpts.unveil;
in
["/run/systemd/journal/socket"] ++ unveiled;
};
};
value.socket = {
description = "PHP-FPM socket for pool '${pool}'";
listenStreams = [sockFile];
socketConfig = {
User = poolOpts.user;
Group = poolOpts.group;
};
};
};
units = mapAttrs' unitsFor (filterAttrs (_: pool: pool.enable) cfg.pools);
in {
sockets = mapAttrs (_: unit: unit.socket) units;
services = mapAttrs (_: unit: unit.service) units;
};
}
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