The squashfs-tools in xenial are patched to support -fstime which I think could be used to achieve the same result. Eg, snapd, if SOURCE_DATE_EPOCH is set and verified, add '-fstime $SOURCE_DATE_EPOCH' to the mksquashfs arguments.
The squashfs-tools in xenial are patched to support -fstime which I think could be used to achieve the same result. Eg, snapd, if SOURCE_DATE_EPOCH is set and verified, add '-fstime $SOURCE_DATE_EPOCH' to the mksquashfs arguments.