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Update BitBake auto versions #80

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Update BitBake auto versions #80

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34 changes: 5 additions & 29 deletions doc/source/building-with-yocto.rst
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Original file line number Diff line number Diff line change
Expand Up @@ -178,47 +178,23 @@ For example, to automatically set the version tag:
Automatic versions in sw-description
------------------------------------

By setting the version tag in the update file to `@SWU_AUTO_VERSION` it is
By setting the version tag in the update file to `$swupdate_get_pkgvar(<package-name>)` it is
automatically replaced with `PV` from BitBake's package-data-file for the package
matching the name of the provided filename tag.
matching the name of the provided <package-name> tag.
For example, to set the version tag to `PV` of package `u-boot`:

::

filename = "u-boot";
...
version = "@SWU_AUTO_VERSION";

Since the filename can differ from package name (deployed with another name or
the file is a container for the real package) you can append the correct package
name to the tag: `@SWU_AUTO_VERSION:<package-name>`.
For example, to set the version tag of the file `packed-bootloader` to `PV` of
package `u-boot`:

::

filename = "packed-bootloader";
...
version = "@SWU_AUTO_VERSION:u-boot";
version = "$swupdate_get_pkgvar(u-boot)";

To automatically insert the value of a variable from BitBake's package-data-file
different to `PV` (e.g. `PKGV`) you can append the variable name to the tag:
`@SWU_AUTO_VERSION@<package-data-variable>`.
`$swupdate_get_pkgvar(<package-name>@<package-data-variable>)`
For example, to set the version tag to `PKGV` of package `u-boot`:

::

filename = "u-boot";
...
version = "@SWU_AUTO_VERSION@PKGV";

Or combined with a different package name:

::

filename = "packed-bootloader";
...
version = "@SWU_AUTO_VERSION:u-boot@PKGV";
version = "$swupdate_get_pkgvar(u-bootPKGV)";

Using checksum for version
--------------------------
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