pack: Add '--entry-point'.

* guix/scripts/pack.scm (self-contained-tarball): Add #:entry-point and
warn when it's true.
(squashfs-image): Add #:entry-point and honor it.
(docker-image): Add #:entry-point and honor it.
(%options, show-help): Add '--entry-point'.
(guix-pack): Honor '--entry-point' and pass #:entry-point to BUILD-IMAGE.
* gnu/tests/docker.scm (run-docker-test): Test 'docker run' with the
default entry point.
(build-tarball&run-docker-test): Pass #:entry-point to 'docker-image'.
* doc/guix.texi (Invoking guix pack): Document it.
* gnu/tests/singularity.scm (run-singularity-test)["singularity run"]:
New test.
(build-tarball&run-singularity-test): Pass #:entry-point to
'squashfs-image'.

2 files changed, 21 insertions, 7 deletions

diff --git a/gnu/tests/docker.scm b/gnu/tests/docker.scm
index 3cd3a27884..f2674cdbe8 100644
--- a/gnu/tests/docker.scm
+++ b/gnu/tests/docker.scm
@@ -101,7 +101,7 @@ inside %DOCKER-OS."
              marionette))
 
           (test-equal "Load docker image and run it"
-            "hello world"
+            '("hello world" "hi!")
             (marionette-eval
              `(begin
                 (define slurp
@@ -117,12 +117,16 @@ inside %DOCKER-OS."
                        (repository&tag (string-drop raw-line
                                                     (string-length
                                                      "Loaded image: ")))
-                       (response (slurp
-                                  ,(string-append #$docker-cli "/bin/docker")
-                                  "run" "--entrypoint" "bin/Guile"
-                                  repository&tag
-                                  "/aa.scm")))
-                  response))
+                       (response1 (slurp
+                                   ,(string-append #$docker-cli "/bin/docker")
+                                   "run" "--entrypoint" "bin/Guile"
+                                   repository&tag
+                                   "/aa.scm"))
+                       (response2 (slurp          ;default entry point
+                                   ,(string-append #$docker-cli "/bin/docker")
+                                   "run" repository&tag
+                                   "-c" "(display \"hi!\")")))
+                  (list response1 response2)))
              marionette))
 
           (test-end)
@@ -161,6 +165,7 @@ standard output device and then enters a new line.")
        (tarball (docker-image "docker-pack" profile
                               #:symlinks '(("/bin/Guile" -> "bin/guile")
                                            ("aa.scm" -> "a.scm"))
+                              #:entry-point "bin/guile"
                               #:localstatedir? #t)))
     (run-docker-test tarball)))
 
diff --git a/gnu/tests/singularity.scm b/gnu/tests/singularity.scm
index 55324ef9ea..668043a0bc 100644
--- a/gnu/tests/singularity.scm
+++ b/gnu/tests/singularity.scm
@@ -103,6 +103,14 @@
                    (cdr (waitpid pid)))))
              marionette))
 
+          (test-equal "singularity run"           ;test the entry point
+            42
+            (marionette-eval
+             `(status:exit-val
+               (system* #$(file-append singularity "/bin/singularity")
+                        "run" #$image "-c" "(exit 42)"))
+             marionette))
+
           (test-end)
           (exit (= (test-runner-fail-count (test-runner-current)) 0)))))
 
@@ -118,6 +126,7 @@
                                      #:hooks '()
                                      #:locales? #f))
        (tarball  (squashfs-image "singularity-pack" profile
+                                 #:entry-point "bin/guile"
                                  #:symlinks '(("/bin" -> "bin")))))
     (run-singularity-test tarball)))