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'.

1 files changed, 9 insertions, 0 deletions

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)))