[leofs][erlang] To be able to build LeoFS with Erlang/OTP 20

[yosukehara]

Since Erlang/OTP 20.0 was released, we need to support it:

[LeoFS' libs]

• leo_backend-db
• leo_cache
• leo_commons
• leo_dcerl
• leo_logger
• leo_mcerl
• leo_mq
• leo_object_storage
• leo_ordning_reda
• leo_redundant_manager
• leo_rpc
• leo_pod
• leo_s3_libs
• leo_statistics
• leo_watchdog
• savanna_agent
• savanna_commons
• erpcgen
• nfs_rpc_server

[yosukehara]

I've found a remaining issue from Travis/Job #538.5.

## https://travis-ci.org/leo-project/leofs/jobs/266674391#L3391
*unexpected termination of test process*
::{compile_forms,{error,[{[],[{none,compile,{crash,lint_module,{...}}}]}],[]}}

[mocchira]

@yosukehara eproxus/meck#177 seems the same issue we hit so we need to upgrade meck to 0.8.6 in all dependent repositories.

• ASIS (The current meck dependencies

# find . -name rebar.config |xargs grep meck
./apps/leo_gateway/rebar.config:        {meck,                  ".*", {git, "https://github.com/eproxus/meck.git",                      {tag, "0.8.4"}}}
./apps/leo_storage/rebar.config:        {meck,                  ".*", {git, "https://github.com/eproxus/meck.git",                      {tag, "0.8.4"}}}
./apps/leo_manager/rebar.config:        {meck,                  ".*", {git, "https://github.com/eproxus/meck.git",                      {tag, "0.8.4"}}}
./deps/leo_s3_libs/rebar.config:    {meck,        ".*", {git, "https://github.com/eproxus/meck.git",            {tag, "0.8.4"}}}
./deps/leo_ordning_reda/rebar.config:        {meck,        ".*", {git, "https://github.com/eproxus/meck.git",            {tag, "0.8.4"}}},
./deps/leo_backend_db/rebar.config:        {meck,        ".*", {git, "https://github.com/eproxus/meck.git",            {tag, "0.8.4"}}},
./deps/folsom/rebar.config:    {meck, ".*", {git, "git://github.com/eproxus/meck", {tag, "0.8.4"}}}
./deps/leo_redundant_manager/rebar.config:        {meck,    ".*", {git, "https://github.com/eproxus/meck.git",        {tag, "0.8.4"}}}
./deps/bitcask/rebar.config:        {meck, "0.8.*", {git, "https://github.com/basho/meck.git", {tag, "0.8.2"}}},
./deps/leo_mq/rebar.config:        {meck,           ".*", {git, "https://github.com/eproxus/meck.git",               {tag, "0.8.4"}}}

• TOBE

./apps/leo_gateway/rebar.config:        {meck,                  ".*", {git, "https://github.com/eproxus/meck.git",                      {tag, "0.8.6"}}}
./apps/leo_storage/rebar.config:        {meck,                  ".*", {git, "https://github.com/eproxus/meck.git",                      {tag, "0.8.6"}}}
./apps/leo_manager/rebar.config:        {meck,                  ".*", {git, "https://github.com/eproxus/meck.git",                      {tag, "0.8.6"}}}
./deps/leo_s3_libs/rebar.config:    {meck,        ".*", {git, "https://github.com/eproxus/meck.git",            {tag, "0.8.6"}}}
./deps/leo_ordning_reda/rebar.config:        {meck,        ".*", {git, "https://github.com/eproxus/meck.git",            {tag, "0.8.6"}}},
./deps/leo_backend_db/rebar.config:        {meck,        ".*", {git, "https://github.com/eproxus/meck.git",            {tag, "0.8.6"}}},
./deps/folsom/rebar.config:    {meck, ".*", {git, "git://github.com/eproxus/meck", {tag, "0.8.6"}}}
./deps/leo_redundant_manager/rebar.config:        {meck,    ".*", {git, "https://github.com/eproxus/meck.git",        {tag, "0.8.6"}}}
./deps/bitcask/rebar.config:        {meck, "0.8.*", {git, "https://github.com/basho/meck.git", {tag, "0.8.6"}}},
./deps/leo_mq/rebar.config:        {meck,           ".*", {git, "https://github.com/eproxus/meck.git",               {tag, "0.8.6"}}}

I've succeeded in passing the eunit test suites with the above 0.8.6 modifications.

[yosukehara]

we need to upgrade meck to 0.8.6 in all dependent repositories.

I'll do it

[yosukehara]

Passed https://travis-ci.org/leo-project/leofs/jobs/267049538

[vstax]

@yosukehara

I noticed that "make release" (as part of building RPM) fails on Erlang 20:

#
# manager-master
#
rm -rf rel/leo_manager/leo_manager/
mkdir -p package/leo_manager_0
cp apps/leo_manager/priv/leo_manager_0.conf rel/leo_manager/files/leo_manager.conf
cp apps/leo_manager/priv/leo_manager_0.schema rel/leo_manager/files/leo_manager.schema
(cd rel/leo_manager && ../../rebar generate)
==> leo_manager (generate)
ERROR: generate failed while processing /home/vm/rpmbuild/BUILD/leofs.git/rel/leo_manager: {'EXIT',{{badmatch,{error,"gs: Missing application directory."}},
         [{rebar_reltool,generate,2,
                         [{file,"src/rebar_reltool.erl"},{line,53}]},
          {rebar_core,run_modules,4,[{file,"src/rebar_core.erl"},{line,490}]},
          {rebar_core,execute,6,[{file,"src/rebar_core.erl"},{line,415}]},
          {rebar_core,maybe_execute,8,
                      [{file,"src/rebar_core.erl"},{line,299}]},
          {rebar_core,process_dir1,7,[{file,"src/rebar_core.erl"},{line,258}]},
          {rebar_core,process_commands,2,
                      [{file,"src/rebar_core.erl"},{line,90}]},
          {rebar,main,1,[{file,"src/rebar.erl"},{line,58}]},
          {escript,run,2,[{file,"escript.erl"},{line,759}]}]}}
make: *** [release] Error 1

[yosukehara]

@vstax Thanks for your report. I'll check it.