store-copy: Canonicalize the mtime and permissions of the store copy.

Fixes a bug whereby directories in the output of 'guix pack -f tarball'
would not be read-only.

* guix/build/store-copy.scm (reset-permissions): New procedure.
(populate-store): Pass #:keep-mtime? #t to 'copy-recursively'.  Call
'reset-permissions'.
* tests/pack.scm ("self-contained-tarball"): In CHECK, define
'canonical?' and use it to check that every file has an mtime of 1 and
is read-only.
* tests/guix-pack.sh: Invoke "chmod -Rf +w" before "rm -rf" in trap.

2 files changed, 37 insertions, 13 deletions

diff --git a/tests/guix-pack.sh b/tests/guix-pack.sh
index 8c1f556426..a43f4d128f 100644
--- a/tests/guix-pack.sh
+++ b/tests/guix-pack.sh
@@ -49,7 +49,7 @@ the_pack="`guix pack --bootstrap -S /opt/gnu/bin=bin guile-bootstrap`"
 # exists because /opt/gnu/bin may be an absolute symlink to a store item that
 # has been GC'd.
 test_directory="`mktemp -d`"
-trap 'rm -rf "$test_directory"' EXIT
+trap 'chmod -Rf +w "$test_directory"; rm -rf "$test_directory"' EXIT
 cd "$test_directory"
 tar -xf "$the_pack"
 test -L opt/gnu/bin
diff --git a/tests/pack.scm b/tests/pack.scm
index a9bc8948b9..40473a9fe9 100644
--- a/tests/pack.scm
+++ b/tests/pack.scm
@@ -68,18 +68,42 @@
                                         #:archiver %tar-bootstrap))
        (check   (gexp->derivation
                  "check-tarball"
-                 #~(let ((bin (string-append "." #$profile "/bin")))
-                     (setenv "PATH"
-                             (string-append #$%tar-bootstrap "/bin"))
-                     (system* "tar" "xvf" #$tarball)
-                     (mkdir #$output)
-                     (exit
-                      (and (file-exists? (string-append bin "/guile"))
-                           (string=? (string-append #$%bootstrap-guile "/bin")
-                                     (readlink bin))
-                           (string=? (string-append ".." #$profile
-                                                    "/bin/guile")
-                                     (readlink "bin/Guile"))))))))
+                 (with-imported-modules '((guix build utils))
+                   #~(begin
+                       (use-modules (guix build utils)
+                                    (srfi srfi-1))
+
+                       (define store
+                         ;; The unpacked store.
+                         (string-append "." (%store-directory) "/"))
+
+                       (define (canonical? file)
+                         ;; Return #t if FILE is read-only and its mtime is 1.
+                         (let ((st (lstat file)))
+                           (or (not (string-prefix? store file))
+                               (eq? 'symlink (stat:type st))
+                               (and (= 1 (stat:mtime st))
+                                    (zero? (logand #o222
+                                                   (stat:mode st)))))))
+
+                       (define bin
+                         (string-append "." #$profile "/bin"))
+
+                       (setenv "PATH"
+                               (string-append #$%tar-bootstrap "/bin"))
+                       (system* "tar" "xvf" #$tarball)
+                       (mkdir #$output)
+                       (exit
+                        (and (file-exists? (string-append bin "/guile"))
+                             (file-exists? store)
+                             (every canonical?
+                                    (find-files "." (const #t)
+                                                #:directories? #t))
+                             (string=? (string-append #$%bootstrap-guile "/bin")
+                                       (readlink bin))
+                             (string=? (string-append ".." #$profile
+                                                      "/bin/guile")
+                                       (readlink "bin/Guile")))))))))
     (built-derivations (list check))))
 
 ;; The following test needs guile-sqlite3, libgcrypt, etc. as a consequence of