fix: option to use installed lima for SOCI e2e tests (runfinch#533)

Issue #, if available:

Closes runfinch#532 

*Description of changes:*

to verify SOCI snapshotter is working correctly, limactl is used to
shell into the Finch VM and check that mounted snapshots match the
expected created by SOCI. In our nightly builds we test against an
installed version of Finch, but the previous SOCI e2e tests did not
account for this. Now, branch on `installed` to determine which lima
path to use.

*Testing done:*

For testing, I uninstalled Finch, reinstalled from brew, and tested that
pathing matched the installation with `INSTALLED=true make test-e2e-vm`
and some debug statements.

`INSTALLED=false make test-e2e-vm` also still works.


- [X] I've reviewed the guidance in CONTRIBUTING.md


#### License Acceptance

By submitting this pull request, I confirm that my contribution is made
under the terms of the Apache 2.0 license.

Signed-off-by: Gavin Inglis <[email protected]>

Author: ginglis13

Diff for: e2e/vm/soci_test.go

@@ -5,6 +5,7 @@ package vm
 
 import (
 	"os"
+	"os/exec"
 	"path/filepath"
 	"strings"
 
@@ -22,17 +23,29 @@ const (
 var testSoci = func(o *option.Option, installed bool) {
 	ginkgo.Describe("SOCI", func() {
 		var limactlO *option.Option
-		var limaHomePathEnv string
-		var wd string
+		var fpath, realFinchPath, limactlPath, limaHomePathEnv, wd string
 		var err error
 
 		ginkgo.BeforeEach(func() {
-			wd, err = os.Getwd()
-			gomega.Expect(err).Should(gomega.BeNil())
-			limaHomePathEnv = "LIMA_HOME=" + filepath.Join(wd, "../../_output/lima/data")
-			limactlO, err = option.New([]string{filepath.Join(wd, "../../_output/lima/bin/limactl")},
+			// Find lima paths. limactl is used to shell into the Finch VM and verify
+			// mounted snapshots match the expected SOCI snapshotter behavior.
+			if installed {
+				fpath, err = exec.LookPath("finch")
+				gomega.Expect(err).ShouldNot(gomega.HaveOccurred())
+				realFinchPath, err = filepath.EvalSymlinks(fpath)
+				gomega.Expect(err).ShouldNot(gomega.HaveOccurred())
+				limactlPath = filepath.Join(realFinchPath, "../../lima/bin/limactl")
+				limaHomePathEnv = "LIMA_HOME=" + filepath.Join(realFinchPath, "../../lima/data")
+			} else {
+				wd, err = os.Getwd()
+				gomega.Expect(err).ShouldNot(gomega.HaveOccurred())
+				limactlPath = filepath.Join(wd, "../../_output/lima/bin/limactl")
+				limaHomePathEnv = "LIMA_HOME=" + filepath.Join(wd, "../../_output/lima/data")
+			}
+
+			limactlO, err = option.New([]string{limactlPath},
 				option.Env([]string{limaHomePathEnv}))
-			gomega.Expect(err).Should(gomega.BeNil())
+			gomega.Expect(err).ShouldNot(gomega.HaveOccurred())
 		})
 
 		ginkgo.It("finch pull should have same mounts as nerdctl pull with SOCI", func() {