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|
//
// imag - the personal information management suite for the commandline
// Copyright (C) 2015-2019 Matthias Beyer <mail@beyermatthias.de> and contributors
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; version
// 2.1 of the License.
//
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
// Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
//
use std::path::Path;
use std::path::PathBuf;
use std::collections::BTreeMap;
use std::ops::Deref;
use libimagentryutil::isa::Is;
use libimagentryutil::isa::IsKindHeaderPathProvider;
use libimagerror::errors::ErrorMsg as EM;
use toml::Value;
use toml_query::read::TomlValueReadExt;
use toml_query::delete::TomlValueDeleteExt;
use toml_query::insert::TomlValueInsertExt;
use failure::Fallible as Result;
use failure::Error;
use failure::err_msg;
use failure::ResultExt;
use hasher::Hasher;
/// A configuration of "collection name" -> "collection path" mappings
///
/// Should be deserializeable from the configuration file right away, because we expect a
/// configuration like this in the config file:
///
/// ```toml
/// [ref.collections]
/// music = "/home/alice/music"
/// documents = "/home/alice/doc"
/// ```
///
/// for example.
#[derive(Serialize, Deserialize, Debug, Clone)]
pub struct Config(BTreeMap<String, PathBuf>);
impl Config {
pub fn new(map: BTreeMap<String, PathBuf>) -> Self {
Config(map)
}
}
impl Deref for Config {
type Target = BTreeMap<String, PathBuf>;
fn deref(&self) -> &Self::Target {
&self.0
}
}
provide_kindflag_path!(pub IsRef, "ref.is_ref");
/// Fassade module
///
/// This module is necessary to build a generic fassade around the "entry with a (default) hasher to
/// represent the entry as a ref".
///
/// The module is for code-structuring only, all types in the module are exported publicly in the
/// supermodule.
pub mod fassade {
use std::marker::PhantomData;
use libimagstore::store::Entry;
use libimagentryutil::isa::Is;
use failure::Fallible as Result;
use failure::Error;
use hasher::sha1::Sha1Hasher;
use hasher::Hasher;
use super::IsRef;
pub trait RefFassade {
fn is_ref(&self) -> Result<bool>;
fn as_ref_with_hasher<H: Hasher>(&self) -> RefWithHasher<H>;
fn as_ref_with_hasher_mut<H: Hasher>(&mut self) -> MutRefWithHasher<H>;
}
impl RefFassade for Entry {
/// Check whether the underlying object is actually a ref
fn is_ref(&self) -> Result<bool> {
self.is::<IsRef>().map_err(Error::from)
}
fn as_ref_with_hasher<H: Hasher>(&self) -> RefWithHasher<H> {
RefWithHasher::new(self)
}
fn as_ref_with_hasher_mut<H: Hasher>(&mut self) -> MutRefWithHasher<H> {
MutRefWithHasher::new(self)
}
}
pub struct RefWithHasher<'a, H: Hasher = Sha1Hasher>(pub(crate) &'a Entry, PhantomData<H>);
impl<'a, H> RefWithHasher<'a, H>
where H: Hasher
{
fn new(entry: &'a Entry) -> Self {
RefWithHasher(entry, PhantomData)
}
}
pub struct MutRefWithHasher<'a, H: Hasher = Sha1Hasher>(pub(crate) &'a mut Entry, PhantomData<H>);
impl<'a, H> MutRefWithHasher<'a, H>
where H: Hasher
{
fn new(entry: &'a mut Entry) -> Self {
MutRefWithHasher(entry, PhantomData)
}
}
}
pub use self::fassade::*;
pub trait Ref {
/// Check whether the underlying object is actually a ref
fn is_ref(&self) -> Result<bool>;
/// Get the stored hash.
fn get_path(&self) -> Result<PathBuf>;
/// Get the stored hash.
fn get_hash(&self) -> Result<&str>;
/// Check whether the referenced file still matches its hash
fn hash_valid(&self, config: &Config) -> Result<bool>;
}
impl<'a, H: Hasher> Ref for RefWithHasher<'a, H> {
/// Check whether the underlying object is actually a ref
fn is_ref(&self) -> Result<bool> {
self.0.is::<IsRef>().map_err(Error::from)
}
fn get_hash(&self) -> Result<&str> {
let header_path = format!("ref.hash.{}", H::NAME);
self.0
.get_header()
.read(&header_path)
.map_err(Error::from)?
.ok_or_else(|| {
Error::from(EM::EntryHeaderFieldMissing("ref.hash.<hash>"))
})
.and_then(|v| {
v.as_str().ok_or_else(|| {
Error::from(EM::EntryHeaderTypeError2("ref.hash.<hash>", "string"))
})
})
}
fn get_path(&self) -> Result<PathBuf> {
self.0
.get_header()
.read("ref.path")
.map_err(Error::from)?
.ok_or_else(|| Error::from(EM::EntryHeaderFieldMissing("ref.path")))
.and_then(|v| {
v.as_str()
.ok_or_else(|| EM::EntryHeaderTypeError2("ref.path", "string"))
.map_err(Error::from)
})
.map(PathBuf::from)
}
fn hash_valid(&self, config: &Config) -> Result<bool> {
let ref_header = self.0
.get_header()
.read("ref")?
.ok_or_else(|| err_msg("Header missing at 'ref'"))?;
let collection_name = ref_header
.read("collection")
.map_err(Error::from)?
.ok_or_else(|| err_msg("Header missing at 'ref.collection'"))?
.as_str()
.ok_or_else(|| Error::from(EM::EntryHeaderTypeError2("ref.hash.<hash>", "string")))?;
let path = ref_header
.read("path")
.map_err(Error::from)?
.ok_or_else(|| err_msg("Header missing at 'ref.path'"))?
.as_str()
.map(PathBuf::from)
.ok_or_else(|| Error::from(EM::EntryHeaderTypeError2("ref.hash.<hash>", "string")))?;
let file_path = get_file_path(config, collection_name.as_ref(), &path)?;
ref_header
.read(H::NAME)
.map_err(Error::from)?
.ok_or_else(|| format_err!("Header missing at 'ref.{}'", H::NAME))
.and_then(|v| {
v.as_str().ok_or_else(|| {
Error::from(EM::EntryHeaderTypeError2("ref.hash.<hash>", "string"))
})
})
.and_then(|hash| H::hash(file_path).map(|h| h == hash))
}
}
pub trait MutRef {
fn remove_ref(&mut self) -> Result<()>;
/// Make a ref out of a normal (non-ref) entry.
///
/// If the entry is already a ref, this fails if `force` is false
fn make_ref<P, Coll>(&mut self, path: P, collection_name: Coll, config: &Config, force: bool)
-> Result<()>
where P: AsRef<Path>,
Coll: AsRef<str>;
}
impl<'a,
|