[PATCH] test-databases: use wget or curl to download test databases

[Tomi Ollila]

Often Linux systems are shipped with wget(1) by default (and no curl).

Many BSDs, macOS, and e.g. some Linux minimal/container images
comes with curl(1) (and no wget).

Attempting to download with curl if wget is not available increases
the likelihood for this to succeed.
---

This is an update to id:1395846591-3490-1-git-send-email-tomi.ollila at iki.fi
(~1080 days). Changed 'hash' to 'command -v' and added '-L' to curl options
(just to be sure) -- and added more detail to the commit message -- Latest
observation was that centos 7 (docker) container image did not have wget(1)
but curl(1) there were.

David asked whether this a job for configure. For the time being I think this
is simplest to use -- any alternative adds unnecessary cohesion between the
tool/configuration and this make. If, in the future, we will add more online
capabilities to this (test) system, then, perhaps we'd better to make some
script (as command) to handle that; now 3 years has passed since my previous
version -- and that is good as we'd like to be as offline as possible there.

 test/test-databases/Makefile.local | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/test/test-databases/Makefile.local b/test/test-databases/Makefile.local
index dcc8863c70d8..7aedff70f6e3 100644
--- a/test/test-databases/Makefile.local
+++ b/test/test-databases/Makefile.local
@@ -7,7 +7,13 @@ dir := test/test-databases
 test_databases := $(dir)/database-v1.tar.xz
 
 %.tar.xz:
-	wget -nv -O $@ ${TEST_DATABASE_MIRROR}/$(notdir $@);
+	@exec 1>&2 ;\
+	if command -v wget >/dev/null ;\
+	then set -x; wget -nv -O $@ ${TEST_DATABASE_MIRROR}/$(notdir $@) ;\
+	elif command -v curl >/dev/null ;\
+	then set -x; curl -L -s -o $@ ${TEST_DATABASE_MIRROR}/$(notdir $@) ;\
+	else echo Cannot fetch databases, no wget nor curl available; exit 1 ;\
+	fi
 
 download-test-databases: ${test_databases}
 
-- 
2.11.0