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author | Yann E. MORIN <yann.morin.1998@free.fr> | 2016-07-03 21:01:58 +0200 |
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committer | Peter Korsgaard <peter@korsgaard.com> | 2016-07-04 15:22:57 +0200 |
commit | 14463d9319731b13aa0a7dc25207fb545eb23ee4 (patch) | |
tree | 7b700d0c749ab6ecebaf91eaa56bfe8a15ddac44 /docs/manual | |
parent | 94fdf6bcb9e194b58d2d36380956391c2f5ba8ac (diff) |
docs/manual: document BR2_ROOTFS_POST_FAKEROOT_SCRIPT
Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Cc: Peter Korsgaard <peter@korsgaard.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
Diffstat (limited to 'docs/manual')
-rw-r--r-- | docs/manual/customize-rootfs.txt | 33 |
1 files changed, 32 insertions, 1 deletions
diff --git a/docs/manual/customize-rootfs.txt b/docs/manual/customize-rootfs.txt index 558bd724d..44fc46067 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 in-memory. + include::customize-device-permission-tables.txt[] |