Edge Cases

Empty ebin Directory

Scenario: No .beam files compiled yet

Behavior: modules list will be empty []

Valid: For library applications without modules

.app.src.script Evaluation

File: .app.src.script

Content: Erlang code that returns application term

Example:

%% .app.src.script
Env = os:getenv("BUILD_ENV"),
Vsn = case Env of
    "prod" -> "1.0.0";
    _ -> "dev"
end,
{application, my_app, [
    {vsn, Vsn},
    {description, "My App"}
]}.

Evaluation: Executed as Erlang code, result used

Extra Src Dirs Modules

Configuration:

{extra_src_dirs, ["test"]}.

Behavior:

Modules in test/ compiled to separate location
Not included in main .app modules list
Prevents test modules from being included in releases

Git Describe Format

Command: git describe --tags

Possible Outputs:

"v1.2.3": Exact tag
"v1.2.3-5-gabc123": 5 commits after tag, commit abc123
"abc123": No tags, just commit SHA

Handling: rebar3 parses and formats appropriately

Missing Version in .app.src

Scenario: No vsn field in .app.src

Error: Failed to get app value 'vsn' from 'src/my_app.app.src'

Required: vsn must be present

Module List with Placeholder

Common Pattern:

{modules, []}  % Will be filled automatically

Also Valid:

{modules, modules}  % Placeholder atom

Both replaced with actual module list

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