Steps to reproduce:

• Create a branch e.g. STABLE and merge some commits to it, which aren't present on master.
• cd to your deployment dir
• git checkout STABLE
• scap deploy "doing something sketchy"

You'll see that the log messages report the correct (stable) revision, but scap attempts to check out the head of master on target nodes.

From /srv/deployment/ores/deploy-cache/cache
 * [new branch]      master     -> origin/master
fatal: reference is not a tree: b4f2b0249a60754cfa4e18650fdd45c62ef4a09a

That's all wrong, that is the head of master.

To workaround, I can run: scap -r STABLE "not so sketchy"