build_image_util: Store path list for recreating tmpfiles rules #1442
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Tested with flatcar/mantle#488 |
The removal of files in the overlay present in the lowerdir creates whiteout entries that mask the lowerdir entries. For those files that have a tmpfile rule for creation, a reboot would cause the file to be created in the upperdir, meaning this file is not updated from the lowerdir when it changes. In addition we have filtered out some tmpfile rules that caused upcopies (symlinks and directories) which meant that removing the /etc/resolv.conf symlink didn't bring it back after reboot. To make files from the lowerdir show up if they have a tmpfile rule that normally would recreate them we keep a list of whiteout entries that we clean up on boot. This also prevents freezing files because systemd-tmpfiles does not need to recreate them in the upperdir.
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build_image_util: Store path list for recreating tmpfiles rules
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The removal of files in the overlay present in the lowerdir creates
whiteout entries that mask the lowerdir entries. For those files that
have a tmpfile rule for creation, a reboot would cause the file to be
created in the upperdir, meaning this file is not updated from the
lowerdir when it changes. In addition we have filtered out some tmpfile
rules that caused upcopies (symlinks and directories) which meant that
removing the /etc/resolv.conf symlink didn't bring it back after reboot.
To make files from the lowerdir show up if they have a tmpfile rule that
normally would recreate them we keep a list of whiteout entries that we
clean up on boot. This also prevents freezing files because
systemd-tmpfiles does not need to recreate them in the upperdir.
How to use
Backport to Stable
Testing done
see flatcar/bootengine#79
changelog/directory (user-facing change, bug fix, security fix, update)/bootand/usrsize, packages, list files for any missing binaries, kernel modules, config files, kernel modules, etc.