From c18ad2bfd9034fe6b80e3f33c076af731be6778b Mon Sep 17 00:00:00 2001
From: baude <bbaude@redhat.com>
Date: Thu, 18 Apr 2019 16:21:31 -0500
Subject: Generate systemd unit files for containers

the podman generate systemd command will generate a systemd unit file
based on the attributes of an existing container and user inputs.  the
command outputs the unit file to stdout for the user to copy or
redirect.  it is enabled for the remote client as well.

users can set a restart policy as well as define a stop timeout
override for the container.

Signed-off-by: baude <bbaude@redhat.com>
---
 pkg/systemdgen/systemdgen.go | 43 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 43 insertions(+)
 create mode 100644 pkg/systemdgen/systemdgen.go

(limited to 'pkg/systemdgen')

diff --git a/pkg/systemdgen/systemdgen.go b/pkg/systemdgen/systemdgen.go
new file mode 100644
index 000000000..3d1c31b5d
--- /dev/null
+++ b/pkg/systemdgen/systemdgen.go
@@ -0,0 +1,43 @@
+package systemdgen
+
+import (
+	"fmt"
+	"path/filepath"
+
+	"github.com/pkg/errors"
+)
+
+var template = `[Unit]
+Description=%s Podman Container
+[Service]
+Restart=%s
+ExecStart=/usr/bin/podman start %s
+ExecStop=/usr/bin/podman stop -t %d %s
+KillMode=none
+Type=forking
+PIDFile=%s
+[Install]
+WantedBy=multi-user.target`
+
+var restartPolicies = []string{"no", "on-success", "on-failure", "on-abnormal", "on-watchdog", "on-abort", "always"}
+
+// ValidateRestartPolicy checks that the user-provided policy is valid
+func ValidateRestartPolicy(restart string) error {
+	for _, i := range restartPolicies {
+		if i == restart {
+			return nil
+		}
+	}
+	return errors.Errorf("%s is not a valid restart policy", restart)
+}
+
+// CreateSystemdUnitAsString takes variables to create a systemd unit file used to control
+// a libpod container
+func CreateSystemdUnitAsString(name, cid, restart, pidPath string, stopTimeout int) (string, error) {
+	if err := ValidateRestartPolicy(restart); err != nil {
+		return "", err
+	}
+	pidFile := filepath.Join(pidPath, fmt.Sprintf("%s.pid", cid))
+	unit := fmt.Sprintf(template, name, restart, name, stopTimeout, name, pidFile)
+	return unit, nil
+}
-- 
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