In certain circumstances (such as the manifest generation of a
filesystem as an unprivileged user) it is important to provide hooks
that override the default os.* implementation of filesystem-related
functions.
In order to avoid merging too much code from outside projects (such as
umoci) this is implemented by providing FsEval hooks to Walk() and
Check(). This allows for users of go-mtree to modify how filesystem
checks are done, without compromising the simplicity of go-mtree's code.
Signed-off-by: Aleksa Sarai <asarai@suse.de>
Setting up sibling and parent relationships for entries, so they can be
easier to walk.
Also, making "keyword=value" easier to parse. This helps filtering.
Both of these ready us for checking/validating a hierarchy.
Signed-off-by: Vincent Batts <vbatts@hashbangbash.com>
Initially only on linux platform, but could accommodate BSDs as well.
The keyword is rather a prefix of the key. So xattr keyword will have a
prefix of "xattr." followed by a suffix of its namespace and name.
The value stored in the manifest is the SHA1 digest of the extended
attribute's data.
Signed-off-by: Vincent Batts <vbatts@hashbangbash.com>
For the most part, all the keywords for a standard mtree spec now have a
function to produce the contents for a creator.
These are used in the "walk" function, and will be used next in the
"check" logic.
This is still a WIP, as the DirectoryHierarchy produced from the current
Walk() is not all-together a valid document.
Signed-off-by: Vincent Batts <vbatts@hashbangbash.com>
