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, 188 insertions, 0 deletions

diff --git a/pkg/systemd/generate/containers_test.go b/pkg/systemd/generate/containers_test.go
index 45bb5173a..2f653a4b9 100644
--- a/pkg/systemd/generate/containers_test.go
+++ b/pkg/systemd/generate/containers_test.go
@@ -91,6 +91,116 @@ Type=forking
 WantedBy=default.target
 `
 
+	goodNameCustomWants := `# container-foobar.service
+# autogenerated by Podman CI
+
+[Unit]
+Description=Podman container-foobar.service
+Documentation=man:podman-generate-systemd(1)
+Wants=network-online.target
+After=network-online.target
+RequiresMountsFor=/var/run/containers/storage
+
+# User-defined dependencies
+Wants=a.service b.service c.target
+
+[Service]
+Environment=PODMAN_SYSTEMD_UNIT=%n
+Restart=on-failure
+TimeoutStopSec=70
+ExecStart=/usr/bin/podman start foobar
+ExecStop=/usr/bin/podman stop -t 10 foobar
+ExecStopPost=/usr/bin/podman stop -t 10 foobar
+PIDFile=/run/containers/storage/overlay-containers/639c53578af4d84b8800b4635fa4e680ee80fd67e0e6a2d4eea48d1e3230f401/userdata/conmon.pid
+Type=forking
+
+[Install]
+WantedBy=default.target
+`
+
+	goodNameCustomAfter := `# container-foobar.service
+# autogenerated by Podman CI
+
+[Unit]
+Description=Podman container-foobar.service
+Documentation=man:podman-generate-systemd(1)
+Wants=network-online.target
+After=network-online.target
+RequiresMountsFor=/var/run/containers/storage
+
+# User-defined dependencies
+After=a.service b.service c.target
+
+[Service]
+Environment=PODMAN_SYSTEMD_UNIT=%n
+Restart=on-failure
+TimeoutStopSec=70
+ExecStart=/usr/bin/podman start foobar
+ExecStop=/usr/bin/podman stop -t 10 foobar
+ExecStopPost=/usr/bin/podman stop -t 10 foobar
+PIDFile=/run/containers/storage/overlay-containers/639c53578af4d84b8800b4635fa4e680ee80fd67e0e6a2d4eea48d1e3230f401/userdata/conmon.pid
+Type=forking
+
+[Install]
+WantedBy=default.target
+`
+
+	goodNameCustomRequires := `# container-foobar.service
+# autogenerated by Podman CI
+
+[Unit]
+Description=Podman container-foobar.service
+Documentation=man:podman-generate-systemd(1)
+Wants=network-online.target
+After=network-online.target
+RequiresMountsFor=/var/run/containers/storage
+
+# User-defined dependencies
+Requires=a.service b.service c.target
+
+[Service]
+Environment=PODMAN_SYSTEMD_UNIT=%n
+Restart=on-failure
+TimeoutStopSec=70
+ExecStart=/usr/bin/podman start foobar
+ExecStop=/usr/bin/podman stop -t 10 foobar
+ExecStopPost=/usr/bin/podman stop -t 10 foobar
+PIDFile=/run/containers/storage/overlay-containers/639c53578af4d84b8800b4635fa4e680ee80fd67e0e6a2d4eea48d1e3230f401/userdata/conmon.pid
+Type=forking
+
+[Install]
+WantedBy=default.target
+`
+
+	goodNameCustomDependencies := `# container-foobar.service
+# autogenerated by Podman CI
+
+[Unit]
+Description=Podman container-foobar.service
+Documentation=man:podman-generate-systemd(1)
+Wants=network-online.target
+After=network-online.target
+RequiresMountsFor=/var/run/containers/storage
+
+# User-defined dependencies
+Wants=a.service b.service c.target
+After=a.service b.service c.target
+Requires=a.service b.service c.target
+
+[Service]
+Environment=PODMAN_SYSTEMD_UNIT=%n
+Restart=on-failure
+TimeoutStopSec=70
+ExecStart=/usr/bin/podman start foobar
+ExecStop=/usr/bin/podman stop -t 10 foobar
+ExecStopPost=/usr/bin/podman stop -t 10 foobar
+PIDFile=/run/containers/storage/overlay-containers/639c53578af4d84b8800b4635fa4e680ee80fd67e0e6a2d4eea48d1e3230f401/userdata/conmon.pid
+Type=forking
+
+[Install]
+WantedBy=default.target
+`
+
 	goodNameBoundTo := `# container-foobar.service
 # autogenerated by Podman CI
 
@@ -613,6 +723,84 @@ WantedBy=default.target
 			false,
 			false,
 		},
+		{"good with name and wants",
+			containerInfo{
+				Executable:        "/usr/bin/podman",
+				ServiceName:       "container-foobar",
+				ContainerNameOrID: "foobar",
+				PIDFile:           "/run/containers/storage/overlay-containers/639c53578af4d84b8800b4635fa4e680ee80fd67e0e6a2d4eea48d1e3230f401/userdata/conmon.pid",
+				StopTimeout:       10,
+				PodmanVersion:     "CI",
+				Wants:             []string{"a.service", "b.service", "c.target"},
+				EnvVariable:       define.EnvVariable,
+				GraphRoot:         "/var/lib/containers/storage",
+				RunRoot:           "/var/run/containers/storage",
+			},
+			goodNameCustomWants,
+			false,
+			false,
+			false,
+			false,
+		},
+		{"good with name and after",
+			containerInfo{
+				Executable:        "/usr/bin/podman",
+				ServiceName:       "container-foobar",
+				ContainerNameOrID: "foobar",
+				PIDFile:           "/run/containers/storage/overlay-containers/639c53578af4d84b8800b4635fa4e680ee80fd67e0e6a2d4eea48d1e3230f401/userdata/conmon.pid",
+				StopTimeout:       10,
+				PodmanVersion:     "CI",
+				After:             []string{"a.service", "b.service", "c.target"},
+				EnvVariable:       define.EnvVariable,
+				GraphRoot:         "/var/lib/containers/storage",
+				RunRoot:           "/var/run/containers/storage",
+			},
+			goodNameCustomAfter,
+			false,
+			false,
+			false,
+			false,
+		},
+		{"good with name and requires",
+			containerInfo{
+				Executable:        "/usr/bin/podman",
+				ServiceName:       "container-foobar",
+				ContainerNameOrID: "foobar",
+				PIDFile:           "/run/containers/storage/overlay-containers/639c53578af4d84b8800b4635fa4e680ee80fd67e0e6a2d4eea48d1e3230f401/userdata/conmon.pid",
+				StopTimeout:       10,
+				PodmanVersion:     "CI",
+				Requires:          []string{"a.service", "b.service", "c.target"},
+				EnvVariable:       define.EnvVariable,
+				GraphRoot:         "/var/lib/containers/storage",
+				RunRoot:           "/var/run/containers/storage",
+			},
+			goodNameCustomRequires,
+			false,
+			false,
+			false,
+			false,
+		},
+		{"good with name and dependencies",
+			containerInfo{
+				Executable:        "/usr/bin/podman",
+				ServiceName:       "container-foobar",
+				ContainerNameOrID: "foobar",
+				PIDFile:           "/run/containers/storage/overlay-containers/639c53578af4d84b8800b4635fa4e680ee80fd67e0e6a2d4eea48d1e3230f401/userdata/conmon.pid",
+				StopTimeout:       10,
+				PodmanVersion:     "CI",
+				Wants:             []string{"a.service", "b.service", "c.target"},
+				After:             []string{"a.service", "b.service", "c.target"},
+				Requires:          []string{"a.service", "b.service", "c.target"},
+				EnvVariable:       define.EnvVariable,
+				GraphRoot:         "/var/lib/containers/storage",
+				RunRoot:           "/var/run/containers/storage",
+			},
+			goodNameCustomDependencies,
+			false,
+			false,
+			false,
+			false,
+		},
 		{"good with name and bound to",
 			containerInfo{
 				Executable:        "/usr/bin/podman",