1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
|
//
// 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::collections::BTreeMap;
use std::path::Path;
use std::path::PathBuf;
use std::ops::Deref;
use libimagentryutil::isa::Is;
use libimagentryutil::isa::IsKindHeaderPathProvider;
use libimagerror::errors::ErrorMsg as EM;
use toml::Value;
use toml::map::Map;
use toml_query::read::TomlValueReadExt;
use toml_query::read::TomlValueReadTypeExt;
use toml_query::read::Partial;
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 crate::hasher::Hasher;
/// A configuration of "basepath name" -> "basepath path" mappings
///
/// Should be deserializeable from the configuration file right away, because we expect a
/// configuration like this in the config file:
///
/// ```toml
/// [ref.basepathes]
/// 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
}
}
impl<'a> Partial<'a> for Config {
const LOCATION: &'static str = "ref.basepathes";
type Output = Self;
}
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::ResultExt;
use failure::Error;
use crate::hasher::sha1::Sha1Hasher;
use crate::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>().context("Failed to check is-ref flag").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>;
fn get_path(&self, config: &Config) -> Result<PathBuf>;
fn get_path_with_basepath_setting<B>(&self, config: &Config, base: B) -> Result<PathBuf>
where B: AsRef<str>;
fn get_relative_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>().context("Failed to check is-ref flag").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)
.context(format_err!("Failed to read header at '{}'", 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"))
})
})
}
/// Get the path of the actual file
fn get_path(&self, config: &Config) -> Result<PathBuf> {
let basepath_name = self.0
.get_header()
.read_string("ref.basepath")?
.ok_or_else(|| Error::from(EM::EntryHeaderFieldMissing("ref.basepath")))?;
self.get_path_with_basepath_setting(config, basepath_name)
}
fn get_path_with_basepath_setting<B>(&self, config: &Config, base: B)
-> Result<PathBuf>
where B: AsRef<str>
{
let relpath = self.0
.get_header()
.read_string("ref.relpath")?
.map(PathBuf::from)
.ok_or_else(|| Error::from(EM::EntryHeaderFieldMissing("ref.relpath")))?;
get_file_path(config, base.as_ref(), relpath)
}
/// Get the relative path, relative to the configured basepath
fn get_relative_path(&self) -> Result<PathBuf> {
self.0
.get_header()
.read("ref.relpath")
.context("Failed to read header at 'ref.relpath'")?
.ok_or_else(|| Error::from(EM::EntryHeaderFieldMissing("ref.relpath")))
.and_then(|v| {
v.as_str()
.ok_or_else(|| EM::EntryHeaderTypeError2("ref.relpath", "string"))
.map_err(Error::from)
})
.map(PathBuf::from)
}
fn hash_valid(&self
|