Get correct username in pod when using --userns=keep-id

Fixes: #17148 Signed-off-by: Daniel J Walsh <dwalsh@redhat.com>
containers · Jan 20, 2023 · 9028b06 · 9028b06
1 parent 9c79e3b
commit 9028b06
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Showing 3 changed files with 22 additions and 3 deletions.
diff --git a/libpod/container_internal_common.go b/libpod/container_internal_common.go
@@ -2454,6 +2454,10 @@ func (c *Container) generateUserPasswdEntry(addedUID int) (string, error) {
 		return entry, nil
 	}
 
+	u, err := user.LookupId(fmt.Sprintf("%d", uid))
+	if err == nil {
+		return fmt.Sprintf("%s:*:%d:%d:%s:%s:/bin/sh\n", u.Username, uid, gid, u.Name, c.WorkingDir()), nil
+	}
 	return fmt.Sprintf("%d:*:%d:%d:container user:%s:/bin/sh\n", uid, uid, gid, c.WorkingDir()), nil
 }
 

diff --git a/test/e2e/pod_create_test.go b/test/e2e/pod_create_test.go
@@ -711,12 +711,14 @@ ENTRYPOINT ["sleep","99999"]
 		session.WaitWithDefaultTimeout()
 		Expect(session).Should(Exit(0))
 
-		// container inside pod inherits user form infra container if --user is not set
-		// etc/passwd entry will look like 1000:*:1000:1000:container user:/:/bin/sh
+		u, err := user.Current()
+		Expect(err).ToNot(HaveOccurred())
+		// container inside pod inherits user from infra container if --user is not set
+		// etc/passwd entry will look like USERNAME:*:1000:1000:Full User Name:/:/bin/sh
 		exec1 := podmanTest.Podman([]string{"exec", ctrName, "cat", "/etc/passwd"})
 		exec1.WaitWithDefaultTimeout()
 		Expect(exec1).Should(Exit(0))
-		Expect(exec1.OutputToString()).To(ContainSubstring("container"))
+		Expect(exec1.OutputToString()).To(ContainSubstring(u.Name))
 
 		exec2 := podmanTest.Podman([]string{"exec", ctrName, "useradd", "testuser"})
 		exec2.WaitWithDefaultTimeout()

diff --git a/test/system/170-run-userns.bats b/test/system/170-run-userns.bats
@@ -140,3 +140,16 @@ EOF
         is "${output}" "Error: keep-id is only supported in rootless mode" "Container should fail to start since keep-id is not supported in rootful mode"
     fi
 }
+
+@test "podman userns=keep-id in a pod" {
+    if is_rootless; then
+        user=$(id -u)
+	run_podman pod create --userns keep-id
+	pid=$output
+        run_podman run --rm --pod $pid $IMAGE id -u
+        is "${output}" "$user" "Container should run as the current user"
+    else
+	run_podman 125 pod create --userns keep-id
+        is "${output}" "Error: keep-id is only supported in rootless mode" "pod should fail to be created since keep-id is not supported in rootful mode"
+    fi
+}