Separator is no longer prepended when prefix is empty on podman generate systemd

When podman generate systemd is invoked, it previously did not check if
container-prefix or pod-prefix are empty. When these are empty, the file name
starts with the separator, which is hyphen by default. This results in files
like '-containername.service'.

The code now checks if these prefixes are empty. If they are, the filename no
longer adds a separator. Instead, it uses name or ID of the container or pod.

Closes #13272

Signed-off-by: Nirmal Patel <npate012@gmail.com>

5 files changed, 105 insertions, 2 deletions

diff --git a/pkg/systemd/generate/common.go b/pkg/systemd/generate/common.go
index a6f8f7cd4..e53d37897 100644
--- a/pkg/systemd/generate/common.go
+++ b/pkg/systemd/generate/common.go
@@ -137,3 +137,17 @@ func removeArg(arg string, args []string) []string {
 	}
 	return newArgs
 }
+
+// This function is used to get name of systemd service from prefix, separator, and
+// container/pod name. If prefix is empty, the service name does not include the
+// separator. This is to avoid a situation where service name starts with the separator
+// which is usually hyphen.
+func getServiceName(prefix string, separator string, name string) string {
+	serviceName := name
+
+	if len(prefix) > 0 {
+		serviceName = prefix + separator + name
+	}
+
+	return serviceName
+}
diff --git a/pkg/systemd/generate/containers.go b/pkg/systemd/generate/containers.go
index ea829c810..c01bb1baf 100644
--- a/pkg/systemd/generate/containers.go
+++ b/pkg/systemd/generate/containers.go
@@ -236,7 +236,9 @@ func containerServiceName(ctr *libpod.Container, options entities.GenerateSystem
 	if options.Name {
 		nameOrID = ctr.Name()
 	}
-	serviceName := fmt.Sprintf("%s%s%s", options.ContainerPrefix, options.Separator, nameOrID)
+
+	serviceName := getServiceName(options.ContainerPrefix, options.Separator, nameOrID)
+
 	return nameOrID, serviceName
 }
 
diff --git a/pkg/systemd/generate/containers_test.go b/pkg/systemd/generate/containers_test.go
index 2f653a4b9..b9bf7c317 100644
--- a/pkg/systemd/generate/containers_test.go
+++ b/pkg/systemd/generate/containers_test.go
@@ -91,6 +91,30 @@ Type=forking
 WantedBy=default.target
 `
 
+	goodNameEmptyContainerPrefix := `# foobar.service
+# autogenerated by Podman CI
+
+[Unit]
+Description=Podman foobar.service
+Documentation=man:podman-generate-systemd(1)
+Wants=network-online.target
+After=network-online.target
+RequiresMountsFor=/var/run/containers/storage
+
+[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
+`
+
 	goodNameCustomWants := `# container-foobar.service
 # autogenerated by Podman CI
 
@@ -1206,6 +1230,24 @@ WantedBy=default.target
 			false,
 			true,
 		},
+		{"good with name and empty container-prefix",
+			containerInfo{
+				Executable:        "/usr/bin/podman",
+				ServiceName:       "foobar",
+				ContainerNameOrID: "foobar",
+				PIDFile:           "/run/containers/storage/overlay-containers/639c53578af4d84b8800b4635fa4e680ee80fd67e0e6a2d4eea48d1e3230f401/userdata/conmon.pid",
+				StopTimeout:       10,
+				PodmanVersion:     "CI",
+				EnvVariable:       define.EnvVariable,
+				GraphRoot:         "/var/lib/containers/storage",
+				RunRoot:           "/var/run/containers/storage",
+			},
+			goodNameEmptyContainerPrefix,
+			false,
+			false,
+			false,
+			false,
+		},
 	}
 	for _, tt := range tests {
 		test := tt
diff --git a/pkg/systemd/generate/pods.go b/pkg/systemd/generate/pods.go
index 003c23e77..78ae6391b 100644
--- a/pkg/systemd/generate/pods.go
+++ b/pkg/systemd/generate/pods.go
@@ -242,7 +242,8 @@ func generatePodInfo(pod *libpod.Pod, options entities.GenerateSystemdOptions) (
 		nameOrID = pod.Name()
 		ctrNameOrID = infraCtr.Name()
 	}
-	serviceName := fmt.Sprintf("%s%s%s", options.PodPrefix, options.Separator, nameOrID)
+
+	serviceName := getServiceName(options.PodPrefix, options.Separator, nameOrID)
 
 	info := podInfo{
 		ServiceName:       serviceName,
diff --git a/pkg/systemd/generate/pods_test.go b/pkg/systemd/generate/pods_test.go
index b37e0825b..dcb18780c 100644
--- a/pkg/systemd/generate/pods_test.go
+++ b/pkg/systemd/generate/pods_test.go
@@ -67,6 +67,32 @@ WantedBy=default.target
 	podGood := serviceInfo + headerInfo + podContent
 	podGoodNoHeaderInfo := serviceInfo + podContent
 
+	podGoodWithEmptyPrefix := `# 123abc.service
+# autogenerated by Podman CI
+
+[Unit]
+Description=Podman 123abc.service
+Documentation=man:podman-generate-systemd(1)
+Wants=network-online.target
+After=network-online.target
+RequiresMountsFor=/var/run/containers/storage
+Requires=container-1.service container-2.service
+Before=container-1.service container-2.service
+
+[Service]
+Environment=PODMAN_SYSTEMD_UNIT=%n
+Restart=on-failure
+TimeoutStopSec=102
+ExecStart=/usr/bin/podman start jadda-jadda-infra
+ExecStop=/usr/bin/podman stop -t 42 jadda-jadda-infra
+ExecStopPost=/usr/bin/podman stop -t 42 jadda-jadda-infra
+PIDFile=/run/containers/storage/overlay-containers/639c53578af4d84b8800b4635fa4e680ee80fd67e0e6a2d4eea48d1e3230f401/userdata/conmon.pid
+Type=forking
+
+[Install]
+WantedBy=default.target
+`
+
 	podGoodCustomWants := `# pod-123abc.service
 # autogenerated by Podman CI
 
@@ -580,6 +606,24 @@ WantedBy=default.target
 			false,
 			false,
 		},
+		{"pod with empty pod-prefix",
+			podInfo{
+				Executable:       "/usr/bin/podman",
+				ServiceName:      "123abc",
+				InfraNameOrID:    "jadda-jadda-infra",
+				PIDFile:          "/run/containers/storage/overlay-containers/639c53578af4d84b8800b4635fa4e680ee80fd67e0e6a2d4eea48d1e3230f401/userdata/conmon.pid",
+				StopTimeout:      42,
+				PodmanVersion:    "CI",
+				GraphRoot:        "/var/lib/containers/storage",
+				RunRoot:          "/var/run/containers/storage",
+				RequiredServices: []string{"container-1", "container-2"},
+				CreateCommand:    []string{"podman", "pod", "create", "--name", "foo", "bar=arg with space"},
+			},
+			podGoodWithEmptyPrefix,
+			false,
+			false,
+			false,
+		},
 	}
 
 	for _, tt := range tests {