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Makefile: check rootfs overlays with BR2_ROOTFS_MERGED_USR enabled

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Add a step to target-finalize that checks each rootfs overlay, following
the criteria established for custom skeletons and using the same script
uesd by skeleton-custom.mk.

Add a paragraph to the documentation clarifying that rootfs overlays
don't need to contain /bin, /lib or /sbin and must not contain them when
BR2_ROOTFS_MERGED_USR is enabled.

Signed-off-by: Carlos Santos <casantos@datacom.ind.br>
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
This commit is contained in:
Carlos Santos
2018-05-07 11:44:29 -03:00
committed by Arnout Vandecappelle (Essensium/Mind)
parent efc974e686
commit dc7c6487cf
2 changed files with 22 additions and 0 deletions
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6
docs/manual/customize-rootfs.txt
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@@ -22,6 +22,12 @@ A filesystem overlay is a tree of files that is copied directly
etc., files called +.empty+ and files ending in +~+ are excluded from
the copy.
+
When +BR2_ROOTFS_MERGED_USR+ is enabled, then the overlay must not
contain the '/bin', '/lib' or '/sbin' directories, as Buildroot will
create them as symbolic links to the relevant folders in '/usr'. In
such a situation, should the overlay have any programs or libraries,
they should be placed in '/usr/bin', '/usr/sbin' and '/usr/lib'.
+
As shown in xref:customize-dir-structure[], the recommended path for
this overlay is +board/<company>/<boardname>/rootfs-overlay+.