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Commit c7d80dd (Cleanup mount points automatically) removed the unmount of $TMP_MOUNT_PATH/tmp/ccache in run_d_in_target() and moved the "rm /tmp/ccache" to elements/base/finalise.d/02-remove-ccache. There are two problems with this: 1) Not unmounting at the end of run_d_in_target() results in tmp/ccache being bind mounted muliple times on top of itself (three times, if you just run `disk-image-create base`). It is eventually unmounted, but somehow the auto unmount code is confused, and tries to unmount it one more time than it was mounted, which results in an error like "umount: /tmp/image.THQkZxQa/mnt/tmp/ccache: not mounted". This doesn't actually break anything, but it's a little messy. 2) "rm /tmp/ccache" in elements/base/finalise.d/02-remove-ccache never succeeds in removing /tmp/ccache, because that hook is invoked by run_d_in_target(), *while* /tmp/ccache is mounted. This present commit solves the above by moving the ccache setup glue out of img-functions and into the base element's root.d. This has the following implications: 1) lib/img-functions is a little cleaner. 2) /tmp/ccache is available in the chroot during the root, extra-data, pre-install, install and post-install stages. It is not available during block-device, finalise and cleanup stages as it will have been automatically unmounted by then. 3) /tmp/ccache won't be setup if you're building an image that doesn't include the base element. Change-Id: Ief4c0a6f4ec622db6c6f652776215684178d8943
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This is the base element.
Almost all users will want to include this in their disk image build, as it includes a lot of useful functionality.
Notes:
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If you are getting warnings during the build about your locale being missing, consider installing/generating the relevant locale. This may be as simple as having language-pack-XX installed in the pre-install stage
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This element ensures /tmp/ccache will be available in the chroot during the root, extra-data, pre-install, install and post-install stages. /tmp/ccache is unavailable during block-device, finalise and cleanup stages as it will have been automatically unmounted by then.