tree: 511e0674596d7584c8f9d736424e1fcc01a5c7d2 [path history] [tgz]
  1. board2.gsc_firmware.instructions
  2. board2.instructions
  3. DEFAULT.instructions
  5. test.board.instructions
  6. test.multi.instructions

Signing Input Instructions

The files in chromite/signing/signer_instructions/ are currently only for testing. The real files used by releases live in crostools/signer_instructions/. The program managers would prefer to keep them internal for now.


This directory holds instruction files that are used when uploading artifacts for signing with official keys. pushimage will process them to create output instruction files which are then posted to a Google Storage bucket that the signing processes watch. The input files tell pushimage how to operate, and output files tell the signer how to operate.

This file covers things that pushimage itself cares about. It does not get into the fields that the signer utilizes. See [References] below for that.


  • DEFAULT.instructions: Default values for all boards/artifacts; loaded first.
  • DEFAULT.$TYPE.instructions: Default values for all boards for a specific artifact type.
  • $BOARD.instructions: Default values for all artifacts for $BOARD, and used for recovery images.
  • $BOARD.$TYPE.instructions: Values specific to a board and artifact type; see pushimage's --sign-types for more info.

Input Instruction Format

There are a few main sections that pushimage cares about:

  • [insns]
  • [insns.XXX] (Where XXX can be anything)
  • [general]

Other sections are passed through to the signer untouched, and many fields in the above sections are also unmodified.

The keys that pushimage looks at are:

channels = comma/space delimited list of the channels to flag for signing
keysets = comma/space delimited list of the keysets to use when signing

A bunch of fields will also be clobbered in the [general] section as pushimage writes out metadata based on the command line flags/artifacts.

Multiple Channel/Keyset Support

When you want to sign a single board/artifact type for multiple channels or keysets, simply list them in the insns.channels and insn.keysets fields. pushimage will take care of posting to the right subdirs and creating unique filenames based on those.

Multiple Inputs

When you want to sign multiple artifacts for a single board (and all the same artifact type), you need to use the multiple input form instead. When you create multiple sections that start with insns., pushimage will overlay that on top of the insns section, and then produce multiple ouput requests.

So if you wrote a file like:

channel = dev
keyset = Zinger
input_files = zinger/ec.bin
keyset = Hoho
input_files = hoho/ec.bin

pushimage will produce two requests for the signer:

channel = dev
keyset = Zinger
input_files = zinger/ec.bin


channel = dev
keyset = Hoho
input_files = hoho/ec.bin


For details on the fields that the signer uses: http://go/cros-sites-archive/resources/engineering/releng/signer-documentation