Re: support shallow gnulib submodule checkouts

[Simon Josefsson]

Updated patch below.

Meanwhile, I'll disable the public-submodule-commit test in the projects
I work on -- I don't think it is appropriate to run it on every 'make
check' invocation.  Disable it by putting this in cfg.mk:

submodule-checks =
gl_public_submodule_commit =

/Simon

diff --git a/top/maint.mk b/top/maint.mk
index c1fdf9ca2c..1982833e91 100644
--- a/top/maint.mk
+++ b/top/maint.mk
@@ -1493,10 +1493,13 @@ submodule-checks ?= no-submodule-changes 
public-submodule-commit
 # Ensure that each sub-module commit we're using is public.
 # Without this, it is too easy to tag and release code that
 # cannot be built from a fresh clone.
+gl_seed ?= d146c864e8d8cc82e96d722337253dd5a3a803b8
 .PHONY: public-submodule-commit
 public-submodule-commit:
        $(AM_V_GEN)if test -d $(srcdir)/.git                            \
-               && git --version >/dev/null 2>&1; then                  \
+               && git --version >/dev/null 2>&1                        \
+               && { cd $(gnulib_dir) &&                                \
+                       git cat-file -e $(gl_seed); }; then             \
          cd $(srcdir) &&                                               \
          git submodule --quiet foreach                                 \
              'test "$$(git rev-parse "$$sha1")"                        \

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