Output an all-zero hash in each patch's From header instead
of the hash of the commit.
---base=<commit>::
+--[no-]base[=<commit>]::
Record the base tree information to identify the state the
patch series applies to. See the BASE TREE INFORMATION section
below for details. If <commit> is "auto", a base commit is
- automatically chosen.
+ automatically chosen. The `--no-base` option overrides a
+ `format.useAutoBase` configuration.
--root::
Treat the revision argument as a <revision range>, even if it