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59 lines
2.3 KiB
Markdown
59 lines
2.3 KiB
Markdown
Version Formats
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===============
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In some circumstances fwupd has to convert from a unsigned integer version
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number into something that has either been used in documentation or has been
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defined in some specification.
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A good example here is the UEFI ESRT table, which specifies a `uint32_t` for
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the version but does not specify how this should be formatted for the user.
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As is typical in underspecified specifications, vendors have converted the
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integer in different ways. For instance, Dell uses version strings like 1.2.3
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and Microsoft use versions like 1.2.3.4.
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The fwudp daemon can match specific devices and apply the correct version style
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using quirk files. The version format can also be specified in the firmware
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`metainfo.xml` file so that the new version is correctly shown, and so that it
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matches on the LVFS website.
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The current version formats supported by fwupd and the LVFS are:
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* `plain`: Use plain integer version numbers with no dots, e.g. `AABBCCDD`
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* `quad`: Use Dell-style `AA.BB.CC.DD` version numbers
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* `triplet`: Use Microsoft-style `AA.BB.CCDD` version numbers
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* `pair`: Use two `AABB.CCDD` version numbers
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* `bcd`: Use binary coded decimal notation
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* `intel-me`: Use Intel ME-style notation (`aaa+11.bbbbb.CC.DDDD`)
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* `intel-me2`: Use alternate Intel ME-style-style `A.B.CC.DDDD` notation
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These can be specified in quirk files like this:
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# Vendor Modelname
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[Guid=5b92717b-2cad-4a96-a13b-9d65781df8bf]
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VersionFormat = intel-me2
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...or in metainfo.xml files like this:
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<custom>
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<value key="LVFS::VersionFormat">intel-me2</value>
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</custom>
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Runtime requirements
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--------------------
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Versions of fwupd `< 1.2.0` can only support firmware updates with key values
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`LVFS::VersionFormat` of `quad` and `triplet`. Additionally, on older versions
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no quirk `VersionFormat` device fixups are supported.
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If want to use one of the additional version formats you should depend on a
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specific version of fwupd in the firmware file:
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<requires>
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<id compare="ge" version="1.2.0">org.freedesktop.fwupd</id>
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</requires>
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This is not *strictly* required, as the integer value can be used for update
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calculations if the version is specified in hex (e.g. `0x12345678`) in the
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`<release>` tag, although the user might get a bit confused if the update
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version does not match the update description.
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