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Handlers for generate systemd with custom dependencies

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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>
This commit is contained in:
esendjer
2022-01-19 14:56:37 +05:00
parent 094b11cbcb
commit b9a2d8698a
13 changed files with 660 additions and 12 deletions
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23
pkg/systemd/generate/containers.go
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@ -94,6 +94,13 @@ type containerInfo struct {
RunRoot string
// Add %i and %I to description and execute parts
IdentifySpecifier bool
// Wants are the list of services that this service is (weak) dependent on. This
// option does not influence the order in which services are started or stopped.
Wants []string
// After ordering dependencies between the list of services and this service.
After []string
// Similar to Wants, but declares a stronger requirement dependency.
Requires []string
}
const containerTemplate = headerTemplate + `
@ -101,6 +108,19 @@ const containerTemplate = headerTemplate + `
BindsTo={{{{- range $index, $value := .BoundToServices -}}}}{{{{if $index}}}} {{{{end}}}}{{{{ $value }}}}.service{{{{end}}}}
After={{{{- range $index, $value := .BoundToServices -}}}}{{{{if $index}}}} {{{{end}}}}{{{{ $value }}}}.service{{{{end}}}}
{{{{- end}}}}
{{{{- if or .Wants .After .Requires }}}}
# User-defined dependencies
{{{{- end}}}}
{{{{- if .Wants}}}}
Wants={{{{- range $index, $value := .Wants }}}}{{{{ if $index}}}} {{{{end}}}}{{{{ $value }}}}{{{{end}}}}
{{{{- end}}}}
{{{{- if .After}}}}
After={{{{- range $index, $value := .After }}}}{{{{ if $index}}}} {{{{end}}}}{{{{ $value }}}}{{{{end}}}}
{{{{- end}}}}
{{{{- if .Requires}}}}
Requires={{{{- range $index, $value := .Requires }}}}{{{{ if $index}}}} {{{{end}}}}{{{{ $value }}}}{{{{end}}}}
{{{{- end}}}}
[Service]
Environment={{{{.EnvVariable}}}}=%n{{{{- if (eq .IdentifySpecifier true) }}}}-%i{{{{- end}}}}
@ -201,6 +221,9 @@ func generateContainerInfo(ctr *libpod.Container, options entities.GenerateSyste
CreateCommand: createCommand,
RunRoot: runRoot,
containerEnv: envs,
Wants: options.Wants,
After: options.After,
Requires: options.Requires,
}
return &info, nil