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keywords: added experimental "xattr" keyword

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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>
This commit is contained in:
Vincent Batts 2016-03-17 13:54:59 -04:00
parent 2d3aea8623
commit 211687bcc4
5 changed files with 34 additions and 2 deletions
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6
keywords.go
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@ -55,6 +55,12 @@ var (
"sha384digest": hasherKeywordFunc("sha384digest", sha512.New384), // A synonym for `sha384`
"sha512": hasherKeywordFunc("sha512", sha512.New), // The SHA512 message digest of the file
"sha512digest": hasherKeywordFunc("sha512digest", sha512.New), // A synonym for `sha512`
// This is not an upstreamed keyword, but a needed attribute for file validation.
// The pattern for this keyword key is prefixed by "xattr." followed by the extended attribute "namespace.key".
// The keyword value is the SHA1 digest of the extended attribute's value.
// In this way, the order of the keys does not matter, and the contents of the value is not revealed.
"xattr": xattrKeywordFunc,
}
)