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systemd.go
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systemd.go
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package main
import (
"fmt"
"regexp"
"slices"
"strconv"
"strings"
"time"
"github.com/compose-spec/compose-go/v2/types"
)
const (
composeLabelPrefix = "compose2nix"
// https://www.freedesktop.org/software/systemd/man/latest/systemd-system.conf.html#DefaultTimeoutStartSec=
defaultSystemdStopTimeout = 90 * time.Second
)
var (
// We purposefully do not support no/yes or 0/1 for false/true to avoid
// ambiguity. Nix supports strings and bools for boolean keys anyways.
systemdTrue = []string{"true", "on"}
systemdFalse = []string{"false", "off"}
// Examples:
// compose2nix.systemd.service.RuntimeMaxSec=100
// compose2nix.systemd.unit.StartLimitBurst=10
systemdLabelRegexp = regexp.MustCompile(fmt.Sprintf(`%s\.systemd\.(service|unit)\.(\w+)`, composeLabelPrefix))
)
// https://www.freedesktop.org/software/systemd/man/latest/systemd.syntax.html
func parseSystemdValue(v string) any {
v = strings.TrimSpace(v)
// Number
if i, err := strconv.ParseInt(v, 10, 64); err == nil {
return int(i)
}
// Boolean
switch {
case slices.Contains(systemdTrue, v):
return true
case slices.Contains(systemdFalse, v):
return false
}
// String
// Remove all quotes from the string.
v = strings.ReplaceAll(v, `"`, "")
v = strings.ReplaceAll(v, `'`, "")
return v
}
// TODO(aksiksi): Add support for repeated keys.
type ServiceConfig struct {
// Map for generic options.
Options map[string]any
}
func (s *ServiceConfig) Set(key string, value any) {
if s.Options == nil {
s.Options = map[string]any{}
}
s.Options[key] = value
}
// TODO(aksiksi): Add support for repeated keys.
type UnitConfig struct {
After []string
Requires []string
PartOf []string
UpheldBy []string
WantedBy []string
RequiresMountsFor []string
// Map for generic options.
Options map[string]any
}
func (u *UnitConfig) Set(key string, value any) {
if u.Options == nil {
u.Options = map[string]any{}
}
switch key {
case "After":
u.After = append(u.After, value.(string))
case "Requires":
u.Requires = append(u.Requires, value.(string))
case "PartOf":
u.PartOf = append(u.PartOf, value.(string))
case "UpheldBy":
u.UpheldBy = append(u.UpheldBy, value.(string))
case "WantedBy":
u.WantedBy = append(u.WantedBy, value.(string))
case "RequiresMountsFor":
u.RequiresMountsFor = append(u.RequiresMountsFor, value.(string))
default:
u.Options[key] = value
}
}
func (c *NixContainerSystemdConfig) ParseRestartPolicy(service *types.ServiceConfig, runtime ContainerRuntime) error {
indefiniteRestart := false
// https://docs.docker.com/compose/compose-file/compose-file-v2/#restart
switch restart := service.Restart; restart {
case "", "no":
c.Service.Set("Restart", "no")
case "always", "on-failure":
// Both of these match the systemd restart options.
c.Service.Set("Restart", restart)
indefiniteRestart = true
case "unless-stopped":
// We don't have an equivalent in systemd. Podman does the same thing.
c.Service.Set("Restart", "always")
indefiniteRestart = true
default:
if strings.HasPrefix(restart, "on-failure:") && len(strings.Split(restart, ":")) == 2 {
c.Service.Set("Restart", "on-failure")
maxAttemptsString := strings.TrimSpace(strings.Split(restart, ":")[1])
maxAttempts, err := strconv.ParseInt(maxAttemptsString, 10, 64)
if err != nil {
return fmt.Errorf("failed to parse on-failure attempts: %q: %w", maxAttemptsString, err)
}
burst := int(maxAttempts)
c.StartLimitBurst = &burst
c.Unit.Set("StartLimitIntervalSec", "infinity")
} else {
return fmt.Errorf("unsupported restart: %q", restart)
}
}
// The newer "deploy" config will always override the legacy "restart" config.
// https://docs.docker.com/compose/compose-file/compose-file-v3/#restart_policy
if deploy := service.Deploy; deploy != nil && deploy.RestartPolicy != nil {
switch condition := deploy.RestartPolicy.Condition; condition {
case "none":
c.Service.Set("Restart", "no")
case "", "any":
// If unset, defaults to "any".
c.Service.Set("Restart", "always")
indefiniteRestart = true
case "on-failure":
c.Service.Set("Restart", "on-failure")
default:
return fmt.Errorf("unsupported condition: %q", condition)
}
if delay := deploy.RestartPolicy.Delay; delay != nil {
c.Service.Set("RestartSec", delay.String())
} else {
c.Service.Set("RestartSec", 0)
}
if maxAttempts := deploy.RestartPolicy.MaxAttempts; maxAttempts != nil {
v := int(*maxAttempts)
c.StartLimitBurst = &v
}
if window := deploy.RestartPolicy.Window; window != nil {
// TODO(aksiksi): Investigate if StartLimitIntervalSec lines up with Compose's "window".
windowSecs := int(time.Duration(*window).Seconds())
c.Unit.Set("StartLimitIntervalSec", windowSecs)
} else if c.StartLimitBurst != nil {
c.Unit.Set("StartLimitIntervalSec", "infinity")
}
}
if indefiniteRestart && runtime == ContainerRuntimeDocker {
// This simulates the default behavior of Docker. Basically, Docker will restart
// the container with a sleep period of 100ms. This sleep period is doubled until a
// maximum of 1 minute.
// See: https://docs.docker.com/reference/cli/docker/container/run/#restart
c.Service.Set("RestartSec", "100ms")
c.Service.Set("RestartSteps", 9) // 2^(9 attempts) = 512 (* 100ms) ~= 1 minute
c.Service.Set("RestartMaxDelaySec", "1m")
}
return nil
}
func (c *NixContainerSystemdConfig) ParseSystemdLabels(service *types.ServiceConfig) error {
var labelsToDrop []string
for label, value := range service.Labels {
if !strings.HasPrefix(label, composeLabelPrefix) {
continue
}
m := systemdLabelRegexp.FindStringSubmatch(label)
if len(m) == 0 {
return fmt.Errorf("invalid compose2nix label specified for service %q: %q", service.Name, label)
}
typ, key := m[1], m[2]
switch typ {
case "service":
c.Service.Set(key, parseSystemdValue(value))
case "unit":
c.Unit.Set(key, parseSystemdValue(value))
default:
return fmt.Errorf(`invalid systemd type %q - must be "service" or "unit"`, typ)
}
labelsToDrop = append(labelsToDrop, label)
}
for _, label := range labelsToDrop {
delete(service.Labels, label)
}
return nil
}