# \`rose\_dry\_run\_mode\`

**URL:** <https://cylc.discourse.group/t/rose-dry-run-mode/1301>\
**Category:** Rose Support\
**Created:** [April 7, 2026, 4:19pm UTC](https://cylc.discourse.group/t/rose-dry-run-mode/1301 "2026-04-07T16:19:48Z")\
**Posts on this page:** 2\
**Page:** 1

<div class="post-metadata">

**Author:** ![wxtim](https://yyz2.discourse-cdn.com/free1/user_avatar/cylc.discourse.group/wxtim/32/151_2.png) [@wxtim](https://cylc.discourse.group/u/wxtim)\
**Post date:** [April 7, 2026, 4:19pm UTC](https://cylc.discourse.group/t/rose-dry-run-mode/1301/1 "2026-04-07T16:19:48Z")

</div>

Hi

I’m looking at a workflow and I’ve found an example of someone setting `ROSE_DRY_RUN_MODE`. The variable is not currently documented and only appears in `metomi/rose/etc/lib/bash/rose_log`, itself only used in `metomi/rose/scripts/rose-mpi-launch`. I don’t think that ROSE\_DRY\_RUN\_MODE does anything outside that context.

Is that correct?  
If so, would you like me to make a documentation PR?

---

<div class="post-metadata">

**Author:** ![wxtim](https://yyz2.discourse-cdn.com/free1/user_avatar/cylc.discourse.group/wxtim/32/151_2.png) [@wxtim](https://cylc.discourse.group/u/wxtim)\
**Post date:** [April 8, 2026, 8:21am UTC](https://cylc.discourse.group/t/rose-dry-run-mode/1301/2 "2026-04-08T08:21:09Z")

</div>

[Write up of in person discussion with Oliver on this matter]

Rose dry run mode works if `rose_log` is sourced somewhere in the environment with the correct path.