[Buildroot] btrfs filesystem image creation using TARGET_DIR path
thomas.petazzoni at bootlin.com
Wed Jul 31 12:45:16 UTC 2019
On Tue, 30 Jul 2019 18:33:52 +0530
chalil jitesh <chaliljitesh at gmail.com> wrote:
> I am trying to create a btrfs filesystem image from buildroot (buildroot
> 2019.02 version). During the btrfs image creation step in the file
> buildroot/fs/btrfs/btrfs.mk the target root file system directory path
> passed to -r option seems to be given as $(TARGET_DIR) which is pointing to
> build/buildroot-fs/btrfs/target instead of actual root file system
> directory $(BASE_TARGET_DIR) (as followed for other file system image
> creation like buildroot/fs/squashfs/squashfs.mk).
> Kindly please review if my understanding is correct or if i am mising any
> steps and if the -r option should point to $(BASE_TARGET_DIR).
> Attaching the changes done for review.
Using $(TARGET_DIR) is correct. What is the problem you are seeing ?
The way it works is the following:
- BASE_TARGET_DIR is output/target. This is where all packages install
their files that should be present on the target. During the package
build/installation, TARGET_DIR points to BASE_TARGET_DIR.
- For each filesystem image format that is enabled, a copy of the
contents of BASE_TARGET_DIR is made, in a per-filesystem directory,
- In the code creating each filesystem image, TARGET_DIR points to
So, using $(TARGET_DIR) in btrfs.mk is correct.
Thomas Petazzoni, CTO, Bootlin
Embedded Linux and Kernel engineering
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