I'm building a Bitbake recipe and getting the following error message:
ERROR: When reparsing virtual:native:/path/to/poky/meta/recipes-devtools/cve-check-tool/cve-check-tool_5.6.4.bb.do_populate_cve_db, the basehash value changed from 0b637979bcb5db4263f9ed97497a6330 to bcd28a5efe646ed4d327fefa349f889c. The metadata is not deterministic and this needs to be fixed.
This reproduces in a clean build (after bitbake -c cleanall -c cleansstate <recipe>).
What is the reason for this error? The recipe has not been modified from the upstream version.
This happens because tasks are evaluated twice, the first time by the cooker, and the second time by bitbake worker. The task hash is calculated twice and if it will not match, meta is considered unstable. Base hash is calculated from variables that are used in the task script. So if you for example use time-related variables like DATETIME, you will get this hash mismatch error. To avoid this error you need to exclude variables from the hash calculation, with VarFlags.
do_something[vardepsexclude]="DATETIME"
here you can find more elaborate explanation. https://www.kc8apf.net/2017/01/tired-of-taskhash-mismatch/