[Buildroot] [PATCH] docs/manual: document BR2_ROOTFS_POST_FAKEROOT_SCRIPT
Peter Korsgaard
peter at korsgaard.com
Mon Jul 4 13:24:11 UTC 2016
>>>>> "Yann" == Yann E MORIN <yann.morin.1998 at free.fr> writes:
> Signed-off-by: "Yann E. MORIN" <yann.morin.1998 at free.fr>
> Cc: Peter Korsgaard <peter at korsgaard.com>
> ---
> docs/manual/customize-rootfs.txt | 33 ++++++++++++++++++++++++++++++++-
> 1 file changed, 32 insertions(+), 1 deletion(-)
> diff --git a/docs/manual/customize-rootfs.txt b/docs/manual/customize-rootfs.txt
> index 558bd72..8d8acd2 100644
> --- a/docs/manual/customize-rootfs.txt
> +++ b/docs/manual/customize-rootfs.txt
> @@ -61,7 +61,7 @@ In addition, you may also use these environment variables:
> stored
> - +BASE_DIR+: the base output directory
> -Below two more methods of customizing the target filesystem are
> +Below three more methods of customizing the target filesystem are
> described, but they are not recommended.
> Direct modification of the target filesystem::
> @@ -104,4 +104,35 @@ This method is not recommended because it duplicates the entire
> skeleton, which prevents taking advantage of the fixes or improvements
> brought to the default skeleton in later Buildroot releases.
> +Post-fakeroot scripts (+BR2_ROOTFS_POST_FAKEROOT_SCRIPT+)::
> ++
> +When aggregating the final images, some parts of the process requires
> + root rights: creating device nodes in `/dev`, setting permissions or
> + ownership to files and directories... To avoid requiring actual root
> + rights, Buildroot uses +fakeroot+ to simulate root rights. This is not
> + a complete substitute for actually being root, but is enough for what
> + Buildroot needs.
> ++
> +Post-fakeroot scripts are shell scripts that are called at the 'end' of
> + the fakeroot phase, 'right before' the filesystem image generator is
> + called. As such, they are called in the fakeroot context.
> ++
> +Post-fakeroot scripts can be useful in case you need to tweak the
> + filesystem to do modifications that are usually only available to the
> + root user.
> ++
> +.Note:
> +It is recommended to use the existing mechanisms to set file permissions
> + or create entries in `/dev` (see xref:customize-device-permission[]) or
> + to create users (see xref:customize-users[])
> ++
> +.Note:
> +The difference between post-build scripts (above) and fakeroot scripts,
> + is that post-build scripts are not called in the fakeroot context.
> ++
> +.Note;
> +Using `fakeroot` is not an absolute substitute for actually being root.
> + `fakeroot` only ever fakes the file access rights and types (regular,
> + block-or-char device...) and uid/gid; these are emulated them in-memory.
s/them //
Committed with that fixed thanks.
--
Venlig hilsen,
Peter Korsgaard
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