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Outsource hash getter functions into new (pub) functions

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This commit is contained in:
Matthias Beyer 2016-06-24 17:31:28 +02:00
parent 9604f94f17
commit 6a24fcb7e4
1 changed files with 30 additions and 23 deletions
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53
libimagref/src/reference.rs
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@ -188,6 +188,34 @@ impl<'a> Ref<'a> {
}
}
/// Get the hash of the link target which is stored in the ref object
pub fn get_stored_hash(&self) -> Result<String> {
match self.0.get_header().read("ref.content_hash") {
// content hash stored...
Ok(Some(Value::String(s))) => Ok(s),
// content hash header field has wrong type
Ok(Some(_)) => Err(REK::HeaderTypeError.into_error()),
// content hash not stored
Ok(None) => Err(REK::HeaderFieldMissingError.into_error()),
// Error
Err(e) => Err(REK::StoreReadError.into_error_with_cause(Box::new(e))),
}
}
/// Get the hash of the link target by reading the link target and hashing the contents
pub fn get_current_hash(&self) -> Result<String> {
self.fs_file()
.and_then(|pb| {
File::open(pb)
.map_err(Box::new)
.map_err(|e| REK::IOError.into_error_with_cause(e))
})
.map(|mut file| hash_file_contents(&mut file))
}
/// check whether the pointer the Ref represents still points to a file which exists
pub fn fs_link_exists(&self) -> Result<bool> {
self.fs_file().map(|pathbuf| pathbuf.exists())
@ -257,29 +285,8 @@ impl<'a> Ref<'a> {
/// Check whether the Hashsum of the referenced file is equal to the stored hashsum
pub fn fs_link_valid_hash(&self) -> Result<bool> {
let stored_hash = try!(match self.0.get_header().read("ref.content_hash") {
// content hash stored...
Ok(Some(Value::String(s))) => Ok(s),
// content hash header field has wrong type
Ok(Some(_)) => Err(REK::HeaderTypeError.into_error()),
// content hash not stored
Ok(None) => Err(REK::HeaderFieldMissingError.into_error()),
// Error
Err(e) => Err(REK::StoreReadError.into_error_with_cause(Box::new(e))),
});
let current_hash = try!(self.fs_file()
.and_then(|pb| {
File::open(pb)
.map_err(Box::new)
.map_err(|e| REK::IOError.into_error_with_cause(e))
})
.map(|mut file| hash_file_contents(&mut file))
);
let stored_hash = try!(self.get_stored_hash());
let current_hash = try!(self.get_current_hash());
Ok(stored_hash == current_hash)
}