Hello,
In my machine config, I have set buildname using:
BUILDNAME = "my_Image_0.0.1_${@time.strftime('%Y%m%d',time.gmtime())}"
In order to get a timestamp (date) in each build name.
Although, this causes some error messages when building the rootfs:
ERROR: When reparsing
/home/buildserver/fsl/sources/meta-freescale-distro/recipes-fsl/images/fsl-image-multimedia-full.bb:do_rootfs,
the basehash value changed from
6b1226a9fe10f08dd4f2fe634944a53cf03f7699a8553a9cc346c097027b24e to
cbd5de79b73a1bc4dd02024bafd1e5c29d4baa8f43617c37eb8f5fc57ed738ed. The metadata
is not deterministic and this needs to be fixed.
ERROR: The following commands may help:
ERROR: $ bitbake fsl-image-multimedia-full -cdo_rootfs -Snone
ERROR: Then:
ERROR: $ bitbake fsl-image-multimedia-full -cdo_rootfs -Sprintdiff
I ran the suggested commands and found the following:
Task fsl-image-multimedia-full:do_rootfs couldn't be used from the cache
because:
We need hash 066153e1a8d8ad0e8025f6409dbac96c277e6300541356b077f1823f195ef19c,
closest matching task was
040147cd35d17688668c7435633fd8ff25d8cf7425a93d35efdd7799a47bdc85
basehash changed from
cbd5de79b73a1bc4dd02024bafd1e5c29d4baa8f43617c37eb8f5fc57ed738ed to
61b1226a9fe10f08dd4f2fe634944a53cf03f7699a8553a9cc346c097027b24e
Variable BUILDNAME value changed from 'my_Image_0.0.1_20211214' to
'my_Image_0.0.1_${@time.strftime('%Y%m%d',time.gmtime())}'
So when ${@time.strftime('%Y%m%d',time.gmtime())}' is converted to the actual
date, it messes with Yocto.
The build succeeds anyway, but it's quite annoying having a load of error
messages on each build.
How can these errors be avoided?
I found in the Yocto FAQ:
This is often something time-related e.g. a timestamp which is calculated every
time an expression is expanded. The solution is to ensure the value is
calculated once per build and then the expression expands to the same value for
the duration of the build.
Which sounds somewhat right, but the issue here is not that the value is
changed due to recalculation (the date rarely changes during a build) but the
expansion of the expression itself (from Pyhton code into its result).
Running Yocto Dunfell.
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