Do not hardcode podman binary location in generate systemd.

It is not correct to rely on specific location of the podman binary.
In most cases it is /usr/bin/podman, but sometimes is not (e.g. in
system tests). Use /proc/self/exe instead of hardcoded path.

Signed-off-by: Danila Kiver <danila.kiver@mail.ru>

2 files changed, 25 insertions, 4 deletions

diff --git a/pkg/systemdgen/systemdgen.go b/pkg/systemdgen/systemdgen.go
index fb91b3e82..06c5ebde5 100644
--- a/pkg/systemdgen/systemdgen.go
+++ b/pkg/systemdgen/systemdgen.go
@@ -2,16 +2,18 @@ package systemdgen
 
 import (
 	"fmt"
+	"os"
 
 	"github.com/pkg/errors"
+	"github.com/sirupsen/logrus"
 )
 
 var template = `[Unit]
 Description=%s Podman Container
 [Service]
 Restart=%s
-ExecStart=/usr/bin/podman start %s
-ExecStop=/usr/bin/podman stop -t %d %s
+ExecStart=%s start %s
+ExecStop=%s stop -t %d %s
 KillMode=none
 Type=forking
 PIDFile=%s
@@ -33,10 +35,25 @@ func ValidateRestartPolicy(restart string) error {
 // CreateSystemdUnitAsString takes variables to create a systemd unit file used to control
 // a libpod container
 func CreateSystemdUnitAsString(name, cid, restart, pidFile string, stopTimeout int) (string, error) {
+	podmanExe := getPodmanExecutable()
+	return createSystemdUnitAsString(podmanExe, name, cid, restart, pidFile, stopTimeout)
+}
+
+func createSystemdUnitAsString(exe, name, cid, restart, pidFile string, stopTimeout int) (string, error) {
 	if err := ValidateRestartPolicy(restart); err != nil {
 		return "", err
 	}
 
-	unit := fmt.Sprintf(template, name, restart, name, stopTimeout, name, pidFile)
+	unit := fmt.Sprintf(template, name, restart, exe, name, exe, stopTimeout, name, pidFile)
 	return unit, nil
 }
+
+func getPodmanExecutable() string {
+	podmanExe, err := os.Executable()
+	if err != nil {
+		podmanExe = "/usr/bin/podman"
+		logrus.Warnf("Could not obtain podman executable location, using default %s", podmanExe)
+	}
+
+	return podmanExe
+}
diff --git a/pkg/systemdgen/systemdgen_test.go b/pkg/systemdgen/systemdgen_test.go
index a0f6a1889..e413b24ce 100644
--- a/pkg/systemdgen/systemdgen_test.go
+++ b/pkg/systemdgen/systemdgen_test.go
@@ -58,6 +58,7 @@ PIDFile=/var/run/containers/storage/overlay-containers/639c53578af4d84b8800b4635
 WantedBy=multi-user.target`
 
 	type args struct {
+		exe         string
 		name        string
 		cid         string
 		restart     string
@@ -73,6 +74,7 @@ WantedBy=multi-user.target`
 
 		{"good with id",
 			args{
+				"/usr/bin/podman",
 				"639c53578af4d84b8800b4635fa4e680ee80fd67e0e6a2d4eea48d1e3230f401",
 				"639c53578af4d84b8800b4635fa4e680ee80fd67e0e6a2d4eea48d1e3230f401",
 				"always",
@@ -84,6 +86,7 @@ WantedBy=multi-user.target`
 		},
 		{"good with name",
 			args{
+				"/usr/bin/podman",
 				"foobar",
 				"639c53578af4d84b8800b4635fa4e680ee80fd67e0e6a2d4eea48d1e3230f401",
 				"always",
@@ -95,6 +98,7 @@ WantedBy=multi-user.target`
 		},
 		{"bad restart policy",
 			args{
+				"/usr/bin/podman",
 				"639c53578af4d84b8800b4635fa4e680ee80fd67e0e6a2d4eea48d1e3230f401",
 				"639c53578af4d84b8800b4635fa4e680ee80fd67e0e6a2d4eea48d1e3230f401",
 				"never",
@@ -107,7 +111,7 @@ WantedBy=multi-user.target`
 	}
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {
-			got, err := CreateSystemdUnitAsString(tt.args.name, tt.args.cid, tt.args.restart, tt.args.pidFile, tt.args.stopTimeout)
+			got, err := createSystemdUnitAsString(tt.args.exe, tt.args.name, tt.args.cid, tt.args.restart, tt.args.pidFile, tt.args.stopTimeout)
 			if (err != nil) != tt.wantErr {
 				t.Errorf("CreateSystemdUnitAsString() error = %v, wantErr %v", err, tt.wantErr)
 				return