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When running "arc land" from a detached HEAD, don't try to delete the source ref

Authored by epriestley on Sep 5 2019, 12:25 PM.



Fixes T10321. Some reasonable but less-common workflows involve running arc land from a detached HEAD state.

When users do this, we currently try to delete the raw hash as though it were a branch during cleanup. Instead, detect if the thing we're thinking about deleting is a branch or not, and just leave it alone if it isn't.

Test Plan
  • Ran git checkout <some hash>, then arc land --revision <some revision>.
  • Before, everything worked but cleanup tried to git branch -D <some hash>.
  • After, everything worked and cleanup skipped branch deletion.

Diff Detail

rARC Arcanist
Automatic diff as part of commit; lint not applicable.
Automatic diff as part of commit; unit tests not applicable.