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fwupd/docs/version-format.md
Richard Hughes 89ab873f72 trivial: Add yet another version encoding 
This variant is a quad-style, but with the Microsoft style 4 digit BuildVer.
2018-10-18 19:31:04 +01:00

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Version Formats

In some circumstances fwupd has to convert from a unsigned integer version number into something that has either been used in documentation or has been defined in some specification. A good example here is the UEFI ESRT table, which specifies a uint32_t for the version but does not specify how this should be formatted for the user.

As is typical in underspecified specifications, vendors have converted the integer in different ways. For instance, Dell uses version strings like 1.2.3 and Microsoft use versions like 1.2.3.4.

The fwudp daemon can match specific devices and apply the correct version style using quirk files. The version format can also be specified in the firmware metainfo.xml file so that the new version is correctly shown, and so that it matches on the LVFS website.

The current version formats supported by fwupd and the LVFS are:

  • plain: Use plain integer version numbers with no dots, e.g. AABBCCDD
  • quad: Use Dell-style AA.BB.CC.DD version numbers
  • triplet: Use Microsoft-style AA.BB.CCDD version numbers
  • pair: Use two AABB.CCDD version numbers
  • bcd: Use binary coded decimal notation
  • intel-me: Use Intel ME-style notation (aaa+11.bbbbb.CC.DDDD)
  • intel-me2: Use alternate Intel ME-style-style A.B.CC.DDDD notation

These can be specified in quirk files like this:

# Vendor Modelname
[Guid=5b92717b-2cad-4a96-a13b-9d65781df8bf]
VersionFormat = intel-me2

...or in metainfo.xml files like this:

<custom>
  <value key="LVFS::VersionFormat">intel-me2</value>
</custom>

Runtime requirements

Versions of fwupd < 1.2.0 can only support firmware updates with key values LVFS::VersionFormat of quad and triplet. Additionally, on older versions no quirk VersionFormat device fixups are supported.

If want to use one of the additional version formats you should depend on a specific version of fwupd in the firmware file:

<requires>
  <id compare="ge" version="1.2.0">org.freedesktop.fwupd</id>
</requires>

This is not strictly required, as the integer value can be used for update calculations if the version is specified in hex (e.g. 0x12345678) in the <release> tag, although the user might get a bit confused if the update version does not match the update description.