Dry run

[igorkamyshev]

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Add option for dry run.

[uka17]

@igorkamyshev Does that mean executing each script and corresponding fallback script in each file?

[igorkamyshev]

Nope, I meant, this command should only show logs — what scripts are going to be executed. E.g., name publish --dry-run doesn't publish anything, but it shows a full info about publication.

[uka17]

@igorkamyshev So, command yarn trona --dry-run should show logs of potential execution. Let's assume we have scripts:

• 1.sql
• 2.sql
• 3.sql

Case 1: First execution of yarn trona --dry-run will just output all scripts considering execution order. Case 2: All subsequent executions yarn trona --dry-run after case 1 will not output anything (no any evolution is being applied) Case 3: 2.sql was changed. yarn trona --dry-run will output degrade and evolution scripts of all upcomming files starting from 2.sql.

Correct?

[igorkamyshev]

Yeah. In my mind, it should have the same behaviour as now, just without flushing changes to database.