Handlers for `generate systemd` with custom dependencies

This commit includes:
* Handlers for generate systemd unit
  with manually defined dependencies such as:
  Wants=, After= and Requires=

* The new unit and e2e tests for checking generated systemd units
  for container and pod with custom dependencies

* Documented descriptions for custom dependencies options

Signed-off-by: Eugene (Evgenii) Shubin <esendjer@gmail.com>

1 files changed, 12 insertions, 0 deletions

diff --git a/cmd/podman/generate/systemd.go b/cmd/podman/generate/systemd.go
index 5ad42ebc0..0dab6299d 100644
--- a/cmd/podman/generate/systemd.go
+++ b/cmd/podman/generate/systemd.go
@@ -25,6 +25,9 @@ const (
 	restartPolicyFlagName     = "restart-policy"
 	restartSecFlagName        = "restart-sec"
 	newFlagName               = "new"
+	wantsFlagName             = "wants"
+	afterFlagName             = "after"
+	requiresFlagName          = "requires"
 )
 
 var (
@@ -97,6 +100,15 @@ func init() {
 	flags.StringVar(&format, formatFlagName, "", "Print the created units in specified format (json)")
 	_ = systemdCmd.RegisterFlagCompletionFunc(formatFlagName, common.AutocompleteFormat(nil))
 
+	flags.StringArrayVar(&systemdOptions.Wants, wantsFlagName, nil, "Add (weak) requirement dependencies to the generated unit file")
+	_ = systemdCmd.RegisterFlagCompletionFunc(wantsFlagName, completion.AutocompleteNone)
+
+	flags.StringArrayVar(&systemdOptions.After, afterFlagName, nil, "Add dependencies order to the generated unit file")
+	_ = systemdCmd.RegisterFlagCompletionFunc(afterFlagName, completion.AutocompleteNone)
+
+	flags.StringArrayVar(&systemdOptions.Requires, requiresFlagName, nil, "Similar to wants, but declares stronger requirement dependencies")
+	_ = systemdCmd.RegisterFlagCompletionFunc(requiresFlagName, completion.AutocompleteNone)
+
 	flags.SetNormalizeFunc(utils.TimeoutAliasFlags)
 }