Lager must be included as dep in root rebar.config

[geib]

I have an erlang project which I am migrating to use the rebar3_plugin, but the project does not use lager. If I don't include lager in the root rebar.config then the application will not start. I appears as though a dependency of lager, within the cuttlefish plugin, does not start.

As a workaround including lager in the rebar.config of the project fixes the issue.

Here is a snippet of the error on the console:

• ERTS_LIB_DIR=/home/geib/git/cse.spooler.v2/_build/prod/rel/cse_spooler/erts-7.2/../lib
• CUTTLEFISHCMD=/home/geib/git/cse.spooler.v2/_build/prod/rel/cse_spooler/erts-7.2/bin/escript /home/geib/git/cse.spooler.v2/_build/prod/rel/cse_spooler/bin/cuttlefish
• cd /home/geib/git/cse.spooler.v2/_build/prod/rel/cse_spooler
• /home/geib/git/cse.spooler.v2/_build/prod/rel/cse_spooler/erts-7.2/bin/escript /home/geib/git/cse.spooler.v2/_build/prod/rel/cse_spooler/bin/cuttlefish -e /home/geib/git/cse.spooler.v2/_build/prod/rel/cse_spooler/etc -d /home/geib/git/cse.spooler.v2/_build/prod/rel/cse_spooler/generated.conf -s /home/geib/git/cse.spooler.v2/_build/prod/rel/cse_spooler/share/schema/ -c /home/geib/git/cse.spooler.v2/_build/prod/rel/cse_spooler/etc/cse_spooler.conf
• CUTTLEFISH_CONFIG=escript: exception error: {app_start_failed,syntax_tools,
  {"no such file or directory",
  "syntax_tools.app"}}
  in function lager:start_ok/2 (/home/geib/git/cse.spooler.v2/_build/default/plugins/lager/src/lager.erl, line 58)
  in call from lager:start_ok/2 (/home/geib/git/cse.spooler.v2/_build/default/plugins/lager/src/lager.erl, line 55)
  in call from lager:start_ok/2 (/home/geib/git/cse.spooler.v2/_build/default/plugins/lager/src/lager.erl, line 55)
  in call from cuttlefish_escript:main/1 (/home/geib/git/cse.spooler.v2/_build/default/plugins/cuttlefish/src/cuttlefish_escript.erl, line 83)
  in call from escript:run/2 (escript.erl, line 757)
  in call from escript:start/1 (escript.erl, line 277)
  in call from init:start_it/1
  in call from init:start_em/1
• echo Cuttlefish failed! Oh no!
  Cuttlefish failed! Oh no!
• exit 1

[binarytemple]

+1 on this issue, working through it ATM

[tsloughter]

Cuttlefish does depend on lager, I think it should be changed to not do so. Since the other solution is changing cuttlefish's .app.src https://github.com/basho/cuttlefish/blob/develop/src/cuttlefish.app.src to have lager properly in the applications list. But then that forces anyone who wants to use cuttlefish to use lager.

[binarytemple]

I've been running Erlang 19 - seems like the error was the same as this one : Feuerlabs/exometer_core#80

Added a specific dependency on a newer version of lager:

{deps, [
 {lager, {git, "git://github.com/basho/lager.git", {tag, "3.2.2"}}}, 

Then ran the following to unlock the lower level dependency:

rebar3 upgrade lager  

And everything works now.

Worth mentioning that I also deleted the _build directory for good measure.