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
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
use libc;
use raw::git_strarray;
use std::marker;
use std::mem;
use std::ops::Range;
use std::ptr;
use std::slice;
use std::str;
use std::{ffi::CString, os::raw::c_char};

use crate::string_array::StringArray;
use crate::util::Binding;
use crate::{raw, Buf, Direction, Error, FetchPrune, Oid, ProxyOptions, Refspec};
use crate::{AutotagOption, Progress, RemoteCallbacks, Repository};

/// A structure representing a [remote][1] of a git repository.
///
/// [1]: http://git-scm.com/book/en/Git-Basics-Working-with-Remotes
///
/// The lifetime is the lifetime of the repository that it is attached to. The
/// remote is used to manage fetches and pushes as well as refspecs.
pub struct Remote<'repo> {
    raw: *mut raw::git_remote,
    _marker: marker::PhantomData<&'repo Repository>,
}

/// An iterator over the refspecs that a remote contains.
pub struct Refspecs<'remote> {
    range: Range<usize>,
    remote: &'remote Remote<'remote>,
}

/// Description of a reference advertised by a remote server, given out on calls
/// to `list`.
pub struct RemoteHead<'remote> {
    raw: *const raw::git_remote_head,
    _marker: marker::PhantomData<&'remote str>,
}

/// Options which can be specified to various fetch operations.
pub struct FetchOptions<'cb> {
    callbacks: Option<RemoteCallbacks<'cb>>,
    proxy: Option<ProxyOptions<'cb>>,
    prune: FetchPrune,
    update_fetchhead: bool,
    download_tags: AutotagOption,
    custom_headers: Vec<CString>,
    custom_headers_ptrs: Vec<*const c_char>,
}

/// Options to control the behavior of a git push.
pub struct PushOptions<'cb> {
    callbacks: Option<RemoteCallbacks<'cb>>,
    proxy: Option<ProxyOptions<'cb>>,
    pb_parallelism: u32,
    custom_headers: Vec<CString>,
    custom_headers_ptrs: Vec<*const c_char>,
}

/// Holds callbacks for a connection to a `Remote`. Disconnects when dropped
pub struct RemoteConnection<'repo, 'connection, 'cb> {
    _callbacks: Box<RemoteCallbacks<'cb>>,
    _proxy: ProxyOptions<'cb>,
    remote: &'connection mut Remote<'repo>,
}

pub fn remote_into_raw(remote: Remote<'_>) -> *mut raw::git_remote {
    let ret = remote.raw;
    mem::forget(remote);
    ret
}

impl<'repo> Remote<'repo> {
    /// Ensure the remote name is well-formed.
    pub fn is_valid_name(remote_name: &str) -> bool {
        crate::init();
        let remote_name = CString::new(remote_name).unwrap();
        unsafe { raw::git_remote_is_valid_name(remote_name.as_ptr()) == 1 }
    }

    /// Create a detached remote
    ///
    /// Create a remote with the given url in-memory. You can use this
    /// when you have a URL instead of a remote's name.
    /// Contrasted with an anonymous remote, a detached remote will not
    /// consider any repo configuration values.
    pub fn create_detached(url: &str) -> Result<Remote<'_>, Error> {
        crate::init();
        let mut ret = ptr::null_mut();
        let url = CString::new(url)?;
        unsafe {
            try_call!(raw::git_remote_create_detached(&mut ret, url));
            Ok(Binding::from_raw(ret))
        }
    }

    /// Get the remote's name.
    ///
    /// Returns `None` if this remote has not yet been named or if the name is
    /// not valid utf-8
    pub fn name(&self) -> Option<&str> {
        self.name_bytes().and_then(|s| str::from_utf8(s).ok())
    }

    /// Get the remote's name, in bytes.
    ///
    /// Returns `None` if this remote has not yet been named
    pub fn name_bytes(&self) -> Option<&[u8]> {
        unsafe { crate::opt_bytes(self, raw::git_remote_name(&*self.raw)) }
    }

    /// Get the remote's url.
    ///
    /// Returns `None` if the url is not valid utf-8
    pub fn url(&self) -> Option<&str> {
        str::from_utf8(self.url_bytes()).ok()
    }

    /// Get the remote's url as a byte array.
    pub fn url_bytes(&self) -> &[u8] {
        unsafe { crate::opt_bytes(self, raw::git_remote_url(&*self.raw)).unwrap() }
    }

    /// Get the remote's pushurl.
    ///
    /// Returns `None` if the pushurl is not valid utf-8
    pub fn pushurl(&self) -> Option<&str> {
        self.pushurl_bytes().and_then(|s| str::from_utf8(s).ok())
    }

    /// Get the remote's pushurl as a byte array.
    pub fn pushurl_bytes(&self) -> Option<&[u8]> {
        unsafe { crate::opt_bytes(self, raw::git_remote_pushurl(&*self.raw)) }
    }

    /// Get the remote's default branch.
    ///
    /// The remote (or more exactly its transport) must have connected to the
    /// remote repository. This default branch is available as soon as the
    /// connection to the remote is initiated and it remains available after
    /// disconnecting.
    pub fn default_branch(&self) -> Result<Buf, Error> {
        unsafe {
            let buf = Buf::new();
            try_call!(raw::git_remote_default_branch(buf.raw(), self.raw));
            Ok(buf)
        }
    }

    /// Open a connection to a remote.
    pub fn connect(&mut self, dir: Direction) -> Result<(), Error> {
        // TODO: can callbacks be exposed safely?
        unsafe {
            try_call!(raw::git_remote_connect(
                self.raw,
                dir,
                ptr::null(),
                ptr::null(),
                ptr::null()
            ));
        }
        Ok(())
    }

    /// Open a connection to a remote with callbacks and proxy settings
    ///
    /// Returns a `RemoteConnection` that will disconnect once dropped
    pub fn connect_auth<'connection, 'cb>(
        &'connection mut self,
        dir: Direction,
        cb: Option<RemoteCallbacks<'cb>>,
        proxy_options: Option<ProxyOptions<'cb>>,
    ) -> Result<RemoteConnection<'repo, 'connection, 'cb>, Error> {
        let cb = Box::new(cb.unwrap_or_else(RemoteCallbacks::new));
        let proxy_options = proxy_options.unwrap_or_else(ProxyOptions::new);
        unsafe {
            try_call!(raw::git_remote_connect(
                self.raw,
                dir,
                &cb.raw(),
                &proxy_options.raw(),
                ptr::null()
            ));
        }

        Ok(RemoteConnection {
            _callbacks: cb,
            _proxy: proxy_options,
            remote: self,
        })
    }

    /// Check whether the remote is connected
    pub fn connected(&mut self) -> bool {
        unsafe { raw::git_remote_connected(self.raw) == 1 }
    }

    /// Disconnect from the remote
    pub fn disconnect(&mut self) -> Result<(), Error> {
        unsafe {
            try_call!(raw::git_remote_disconnect(self.raw));
        }
        Ok(())
    }

    /// Download and index the packfile
    ///
    /// Connect to the remote if it hasn't been done yet, negotiate with the
    /// remote git which objects are missing, download and index the packfile.
    ///
    /// The .idx file will be created and both it and the packfile with be
    /// renamed to their final name.
    ///
    /// The `specs` argument is a list of refspecs to use for this negotiation
    /// and download. Use an empty array to use the base refspecs.
    pub fn download<Str: AsRef<str> + crate::IntoCString + Clone>(
        &mut self,
        specs: &[Str],
        opts: Option<&mut FetchOptions<'_>>,
    ) -> Result<(), Error> {
        let (_a, _b, arr) = crate::util::iter2cstrs(specs.iter())?;
        let raw = opts.map(|o| o.raw());
        unsafe {
            try_call!(raw::git_remote_download(self.raw, &arr, raw.as_ref()));
        }
        Ok(())
    }

    /// Cancel the operation
    ///
    /// At certain points in its operation, the network code checks whether the
    /// operation has been cancelled and if so stops the operation.
    pub fn stop(&mut self) -> Result<(), Error> {
        unsafe {
            try_call!(raw::git_remote_stop(self.raw));
        }
        Ok(())
    }

    /// Get the number of refspecs for a remote
    pub fn refspecs(&self) -> Refspecs<'_> {
        let cnt = unsafe { raw::git_remote_refspec_count(&*self.raw) as usize };
        Refspecs {
            range: 0..cnt,
            remote: self,
        }
    }

    /// Get the `nth` refspec from this remote.
    ///
    /// The `refspecs` iterator can be used to iterate over all refspecs.
    pub fn get_refspec(&self, i: usize) -> Option<Refspec<'repo>> {
        unsafe {
            let ptr = raw::git_remote_get_refspec(&*self.raw, i as libc::size_t);
            Binding::from_raw_opt(ptr)
        }
    }

    /// Download new data and update tips
    ///
    /// Convenience function to connect to a remote, download the data,
    /// disconnect and update the remote-tracking branches.
    ///
    /// # Examples
    ///
    /// Example of functionality similar to `git fetch origin/main`:
    ///
    /// ```no_run
    /// fn fetch_origin_main(repo: git2::Repository) -> Result<(), git2::Error> {
    ///     repo.find_remote("origin")?.fetch(&["main"], None, None)
    /// }
    ///
    /// let repo = git2::Repository::discover("rust").unwrap();
    /// fetch_origin_main(repo).unwrap();
    /// ```
    pub fn fetch<Str: AsRef<str> + crate::IntoCString + Clone>(
        &mut self,
        refspecs: &[Str],
        opts: Option<&mut FetchOptions<'_>>,
        reflog_msg: Option<&str>,
    ) -> Result<(), Error> {
        let (_a, _b, arr) = crate::util::iter2cstrs(refspecs.iter())?;
        let msg = crate::opt_cstr(reflog_msg)?;
        let raw = opts.map(|o| o.raw());
        unsafe {
            try_call!(raw::git_remote_fetch(self.raw, &arr, raw.as_ref(), msg));
        }
        Ok(())
    }

    /// Update the tips to the new state
    pub fn update_tips(
        &mut self,
        callbacks: Option<&mut RemoteCallbacks<'_>>,
        update_fetchhead: bool,
        download_tags: AutotagOption,
        msg: Option<&str>,
    ) -> Result<(), Error> {
        let msg = crate::opt_cstr(msg)?;
        let cbs = callbacks.map(|cb| cb.raw());
        unsafe {
            try_call!(raw::git_remote_update_tips(
                self.raw,
                cbs.as_ref(),
                update_fetchhead,
                download_tags,
                msg
            ));
        }
        Ok(())
    }

    /// Perform a push
    ///
    /// Perform all the steps for a push. If no refspecs are passed then the
    /// configured refspecs will be used.
    ///
    /// Note that you'll likely want to use `RemoteCallbacks` and set
    /// `push_update_reference` to test whether all the references were pushed
    /// successfully.
    pub fn push<Str: AsRef<str> + crate::IntoCString + Clone>(
        &mut self,
        refspecs: &[Str],
        opts: Option<&mut PushOptions<'_>>,
    ) -> Result<(), Error> {
        let (_a, _b, arr) = crate::util::iter2cstrs(refspecs.iter())?;
        let raw = opts.map(|o| o.raw());
        unsafe {
            try_call!(raw::git_remote_push(self.raw, &arr, raw.as_ref()));
        }
        Ok(())
    }

    /// Get the statistics structure that is filled in by the fetch operation.
    pub fn stats(&self) -> Progress<'_> {
        unsafe { Binding::from_raw(raw::git_remote_stats(self.raw)) }
    }

    /// Get the remote repository's reference advertisement list.
    ///
    /// Get the list of references with which the server responds to a new
    /// connection.
    ///
    /// The remote (or more exactly its transport) must have connected to the
    /// remote repository. This list is available as soon as the connection to
    /// the remote is initiated and it remains available after disconnecting.
    pub fn list(&self) -> Result<&[RemoteHead<'_>], Error> {
        let mut size = 0;
        let mut base = ptr::null_mut();
        unsafe {
            try_call!(raw::git_remote_ls(&mut base, &mut size, self.raw));
            assert_eq!(
                mem::size_of::<RemoteHead<'_>>(),
                mem::size_of::<*const raw::git_remote_head>()
            );
            let slice = slice::from_raw_parts(base as *const _, size as usize);
            Ok(mem::transmute::<
                &[*const raw::git_remote_head],
                &[RemoteHead<'_>],
            >(slice))
        }
    }

    /// Prune tracking refs that are no longer present on remote
    pub fn prune(&mut self, callbacks: Option<RemoteCallbacks<'_>>) -> Result<(), Error> {
        let cbs = Box::new(callbacks.unwrap_or_else(RemoteCallbacks::new));
        unsafe {
            try_call!(raw::git_remote_prune(self.raw, &cbs.raw()));
        }
        Ok(())
    }

    /// Get the remote's list of fetch refspecs
    pub fn fetch_refspecs(&self) -> Result<StringArray, Error> {
        unsafe {
            let mut raw: raw::git_strarray = mem::zeroed();
            try_call!(raw::git_remote_get_fetch_refspecs(&mut raw, self.raw));
            Ok(StringArray::from_raw(raw))
        }
    }

    /// Get the remote's list of push refspecs
    pub fn push_refspecs(&self) -> Result<StringArray, Error> {
        unsafe {
            let mut raw: raw::git_strarray = mem::zeroed();
            try_call!(raw::git_remote_get_push_refspecs(&mut raw, self.raw));
            Ok(StringArray::from_raw(raw))
        }
    }
}

impl<'repo> Clone for Remote<'repo> {
    fn clone(&self) -> Remote<'repo> {
        let mut ret = ptr::null_mut();
        let rc = unsafe { call!(raw::git_remote_dup(&mut ret, self.raw)) };
        assert_eq!(rc, 0);
        Remote {
            raw: ret,
            _marker: marker::PhantomData,
        }
    }
}

impl<'repo> Binding for Remote<'repo> {
    type Raw = *mut raw::git_remote;

    unsafe fn from_raw(raw: *mut raw::git_remote) -> Remote<'repo> {
        Remote {
            raw,
            _marker: marker::PhantomData,
        }
    }
    fn raw(&self) -> *mut raw::git_remote {
        self.raw
    }
}

impl<'repo> Drop for Remote<'repo> {
    fn drop(&mut self) {
        unsafe { raw::git_remote_free(self.raw) }
    }
}

impl<'repo> Iterator for Refspecs<'repo> {
    type Item = Refspec<'repo>;
    fn next(&mut self) -> Option<Refspec<'repo>> {
        self.range.next().and_then(|i| self.remote.get_refspec(i))
    }
    fn size_hint(&self) -> (usize, Option<usize>) {
        self.range.size_hint()
    }
}
impl<'repo> DoubleEndedIterator for Refspecs<'repo> {
    fn next_back(&mut self) -> Option<Refspec<'repo>> {
        self.range
            .next_back()
            .and_then(|i| self.remote.get_refspec(i))
    }
}
impl<'repo> ExactSizeIterator for Refspecs<'repo> {}

#[allow(missing_docs)] // not documented in libgit2 :(
impl<'remote> RemoteHead<'remote> {
    /// Flag if this is available locally.
    pub fn is_local(&self) -> bool {
        unsafe { (*self.raw).local != 0 }
    }

    pub fn oid(&self) -> Oid {
        unsafe { Binding::from_raw(&(*self.raw).oid as *const _) }
    }
    pub fn loid(&self) -> Oid {
        unsafe { Binding::from_raw(&(*self.raw).loid as *const _) }
    }

    pub fn name(&self) -> &str {
        let b = unsafe { crate::opt_bytes(self, (*self.raw).name).unwrap() };
        str::from_utf8(b).unwrap()
    }

    pub fn symref_target(&self) -> Option<&str> {
        let b = unsafe { crate::opt_bytes(self, (*self.raw).symref_target) };
        b.map(|b| str::from_utf8(b).unwrap())
    }
}

impl<'cb> Default for FetchOptions<'cb> {
    fn default() -> Self {
        Self::new()
    }
}

impl<'cb> FetchOptions<'cb> {
    /// Creates a new blank set of fetch options
    pub fn new() -> FetchOptions<'cb> {
        FetchOptions {
            callbacks: None,
            proxy: None,
            prune: FetchPrune::Unspecified,
            update_fetchhead: true,
            download_tags: AutotagOption::Unspecified,
            custom_headers: Vec::new(),
            custom_headers_ptrs: Vec::new(),
        }
    }

    /// Set the callbacks to use for the fetch operation.
    pub fn remote_callbacks(&mut self, cbs: RemoteCallbacks<'cb>) -> &mut Self {
        self.callbacks = Some(cbs);
        self
    }

    /// Set the proxy options to use for the fetch operation.
    pub fn proxy_options(&mut self, opts: ProxyOptions<'cb>) -> &mut Self {
        self.proxy = Some(opts);
        self
    }

    /// Set whether to perform a prune after the fetch.
    pub fn prune(&mut self, prune: FetchPrune) -> &mut Self {
        self.prune = prune;
        self
    }

    /// Set whether to write the results to FETCH_HEAD.
    ///
    /// Defaults to `true`.
    pub fn update_fetchhead(&mut self, update: bool) -> &mut Self {
        self.update_fetchhead = update;
        self
    }

    /// Set how to behave regarding tags on the remote, such as auto-downloading
    /// tags for objects we're downloading or downloading all of them.
    ///
    /// The default is to auto-follow tags.
    pub fn download_tags(&mut self, opt: AutotagOption) -> &mut Self {
        self.download_tags = opt;
        self
    }

    /// Set extra headers for this fetch operation.
    pub fn custom_headers(&mut self, custom_headers: &[&str]) -> &mut Self {
        self.custom_headers = custom_headers
            .iter()
            .map(|&s| CString::new(s).unwrap())
            .collect();
        self.custom_headers_ptrs = self.custom_headers.iter().map(|s| s.as_ptr()).collect();
        self
    }
}

impl<'cb> Binding for FetchOptions<'cb> {
    type Raw = raw::git_fetch_options;

    unsafe fn from_raw(_raw: raw::git_fetch_options) -> FetchOptions<'cb> {
        panic!("unimplemented");
    }
    fn raw(&self) -> raw::git_fetch_options {
        raw::git_fetch_options {
            version: 1,
            callbacks: self
                .callbacks
                .as_ref()
                .map(|m| m.raw())
                .unwrap_or_else(|| RemoteCallbacks::new().raw()),
            proxy_opts: self
                .proxy
                .as_ref()
                .map(|m| m.raw())
                .unwrap_or_else(|| ProxyOptions::new().raw()),
            prune: crate::call::convert(&self.prune),
            update_fetchhead: crate::call::convert(&self.update_fetchhead),
            download_tags: crate::call::convert(&self.download_tags),
            custom_headers: git_strarray {
                count: self.custom_headers_ptrs.len(),
                strings: self.custom_headers_ptrs.as_ptr() as *mut _,
            },
        }
    }
}

impl<'cb> Default for PushOptions<'cb> {
    fn default() -> Self {
        Self::new()
    }
}

impl<'cb> PushOptions<'cb> {
    /// Creates a new blank set of push options
    pub fn new() -> PushOptions<'cb> {
        PushOptions {
            callbacks: None,
            proxy: None,
            pb_parallelism: 1,
            custom_headers: Vec::new(),
            custom_headers_ptrs: Vec::new(),
        }
    }

    /// Set the callbacks to use for the fetch operation.
    pub fn remote_callbacks(&mut self, cbs: RemoteCallbacks<'cb>) -> &mut Self {
        self.callbacks = Some(cbs);
        self
    }

    /// Set the proxy options to use for the fetch operation.
    pub fn proxy_options(&mut self, opts: ProxyOptions<'cb>) -> &mut Self {
        self.proxy = Some(opts);
        self
    }

    /// If the transport being used to push to the remote requires the creation
    /// of a pack file, this controls the number of worker threads used by the
    /// packbuilder when creating that pack file to be sent to the remote.
    ///
    /// if set to 0 the packbuilder will auto-detect the number of threads to
    /// create, and the default value is 1.
    pub fn packbuilder_parallelism(&mut self, parallel: u32) -> &mut Self {
        self.pb_parallelism = parallel;
        self
    }

    /// Set extra headers for this push operation.
    pub fn custom_headers(&mut self, custom_headers: &[&str]) -> &mut Self {
        self.custom_headers = custom_headers
            .iter()
            .map(|&s| CString::new(s).unwrap())
            .collect();
        self.custom_headers_ptrs = self.custom_headers.iter().map(|s| s.as_ptr()).collect();
        self
    }
}

impl<'cb> Binding for PushOptions<'cb> {
    type Raw = raw::git_push_options;

    unsafe fn from_raw(_raw: raw::git_push_options) -> PushOptions<'cb> {
        panic!("unimplemented");
    }
    fn raw(&self) -> raw::git_push_options {
        raw::git_push_options {
            version: 1,
            callbacks: self
                .callbacks
                .as_ref()
                .map(|m| m.raw())
                .unwrap_or_else(|| RemoteCallbacks::new().raw()),
            proxy_opts: self
                .proxy
                .as_ref()
                .map(|m| m.raw())
                .unwrap_or_else(|| ProxyOptions::new().raw()),
            pb_parallelism: self.pb_parallelism as libc::c_uint,
            custom_headers: git_strarray {
                count: self.custom_headers_ptrs.len(),
                strings: self.custom_headers_ptrs.as_ptr() as *mut _,
            },
        }
    }
}

impl<'repo, 'connection, 'cb> RemoteConnection<'repo, 'connection, 'cb> {
    /// Check whether the remote is (still) connected
    pub fn connected(&mut self) -> bool {
        self.remote.connected()
    }

    /// Get the remote repository's reference advertisement list.
    ///
    /// This list is available as soon as the connection to
    /// the remote is initiated and it remains available after disconnecting.
    pub fn list(&self) -> Result<&[RemoteHead<'_>], Error> {
        self.remote.list()
    }

    /// Get the remote's default branch.
    ///
    /// This default branch is available as soon as the connection to the remote
    /// is initiated and it remains available after disconnecting.
    pub fn default_branch(&self) -> Result<Buf, Error> {
        self.remote.default_branch()
    }

    /// access remote bound to this connection
    pub fn remote(&mut self) -> &mut Remote<'repo> {
        self.remote
    }
}

impl<'repo, 'connection, 'cb> Drop for RemoteConnection<'repo, 'connection, 'cb> {
    fn drop(&mut self) {
        drop(self.remote.disconnect());
    }
}

#[cfg(test)]
mod tests {
    use crate::{AutotagOption, PushOptions};
    use crate::{Direction, FetchOptions, Remote, RemoteCallbacks, Repository};
    use std::cell::Cell;
    use tempfile::TempDir;

    #[test]
    fn smoke() {
        let (td, repo) = crate::test::repo_init();
        t!(repo.remote("origin", "/path/to/nowhere"));
        drop(repo);

        let repo = t!(Repository::init(td.path()));
        let mut origin = t!(repo.find_remote("origin"));
        assert_eq!(origin.name(), Some("origin"));
        assert_eq!(origin.url(), Some("/path/to/nowhere"));
        assert_eq!(origin.pushurl(), None);

        t!(repo.remote_set_url("origin", "/path/to/elsewhere"));
        t!(repo.remote_set_pushurl("origin", Some("/path/to/elsewhere")));

        let stats = origin.stats();
        assert_eq!(stats.total_objects(), 0);

        t!(origin.stop());
    }

    #[test]
    fn create_remote() {
        let td = TempDir::new().unwrap();
        let remote = td.path().join("remote");
        Repository::init_bare(&remote).unwrap();

        let (_td, repo) = crate::test::repo_init();
        let url = if cfg!(unix) {
            format!("file://{}", remote.display())
        } else {
            format!(
                "file:///{}",
                remote.display().to_string().replace("\\", "/")
            )
        };

        let mut origin = repo.remote("origin", &url).unwrap();
        assert_eq!(origin.name(), Some("origin"));
        assert_eq!(origin.url(), Some(&url[..]));
        assert_eq!(origin.pushurl(), None);

        {
            let mut specs = origin.refspecs();
            let spec = specs.next().unwrap();
            assert!(specs.next().is_none());
            assert_eq!(spec.str(), Some("+refs/heads/*:refs/remotes/origin/*"));
            assert_eq!(spec.dst(), Some("refs/remotes/origin/*"));
            assert_eq!(spec.src(), Some("refs/heads/*"));
            assert!(spec.is_force());
        }
        assert!(origin.refspecs().next_back().is_some());
        {
            let remotes = repo.remotes().unwrap();
            assert_eq!(remotes.len(), 1);
            assert_eq!(remotes.get(0), Some("origin"));
            assert_eq!(remotes.iter().count(), 1);
            assert_eq!(remotes.iter().next().unwrap(), Some("origin"));
        }

        origin.connect(Direction::Push).unwrap();
        assert!(origin.connected());
        origin.disconnect().unwrap();

        origin.connect(Direction::Fetch).unwrap();
        assert!(origin.connected());
        origin.download(&[] as &[&str], None).unwrap();
        origin.disconnect().unwrap();

        {
            let mut connection = origin.connect_auth(Direction::Push, None, None).unwrap();
            assert!(connection.connected());
        }
        assert!(!origin.connected());

        {
            let mut connection = origin.connect_auth(Direction::Fetch, None, None).unwrap();
            assert!(connection.connected());
        }
        assert!(!origin.connected());

        origin.fetch(&[] as &[&str], None, None).unwrap();
        origin.fetch(&[] as &[&str], None, Some("foo")).unwrap();
        origin
            .update_tips(None, true, AutotagOption::Unspecified, None)
            .unwrap();
        origin
            .update_tips(None, true, AutotagOption::All, Some("foo"))
            .unwrap();

        t!(repo.remote_add_fetch("origin", "foo"));
        t!(repo.remote_add_fetch("origin", "bar"));
    }

    #[test]
    fn rename_remote() {
        let (_td, repo) = crate::test::repo_init();
        repo.remote("origin", "foo").unwrap();
        drop(repo.remote_rename("origin", "foo"));
        drop(repo.remote_delete("foo"));
    }

    #[test]
    fn create_remote_anonymous() {
        let td = TempDir::new().unwrap();
        let repo = Repository::init(td.path()).unwrap();

        let origin = repo.remote_anonymous("/path/to/nowhere").unwrap();
        assert_eq!(origin.name(), None);
        drop(origin.clone());
    }

    #[test]
    fn is_valid() {
        assert!(Remote::is_valid_name("foobar"));
        assert!(!Remote::is_valid_name("\x01"));
    }

    #[test]
    fn transfer_cb() {
        let (td, _repo) = crate::test::repo_init();
        let td2 = TempDir::new().unwrap();
        let url = crate::test::path2url(&td.path());

        let repo = Repository::init(td2.path()).unwrap();
        let progress_hit = Cell::new(false);
        {
            let mut callbacks = RemoteCallbacks::new();
            let mut origin = repo.remote("origin", &url).unwrap();

            callbacks.transfer_progress(|_progress| {
                progress_hit.set(true);
                true
            });
            origin
                .fetch(
                    &[] as &[&str],
                    Some(FetchOptions::new().remote_callbacks(callbacks)),
                    None,
                )
                .unwrap();

            let list = t!(origin.list());
            assert_eq!(list.len(), 2);
            assert_eq!(list[0].name(), "HEAD");
            assert!(!list[0].is_local());
            assert_eq!(list[1].name(), "refs/heads/main");
            assert!(!list[1].is_local());
        }
        assert!(progress_hit.get());
    }

    /// This test is meant to assure that the callbacks provided to connect will not cause
    /// segfaults
    #[test]
    fn connect_list() {
        let (td, _repo) = crate::test::repo_init();
        let td2 = TempDir::new().unwrap();
        let url = crate::test::path2url(&td.path());

        let repo = Repository::init(td2.path()).unwrap();
        let mut callbacks = RemoteCallbacks::new();
        callbacks.sideband_progress(|_progress| {
            // no-op
            true
        });

        let mut origin = repo.remote("origin", &url).unwrap();

        {
            let mut connection = origin
                .connect_auth(Direction::Fetch, Some(callbacks), None)
                .unwrap();
            assert!(connection.connected());

            let list = t!(connection.list());
            assert_eq!(list.len(), 2);
            assert_eq!(list[0].name(), "HEAD");
            assert!(!list[0].is_local());
            assert_eq!(list[1].name(), "refs/heads/main");
            assert!(!list[1].is_local());
        }
        assert!(!origin.connected());
    }

    #[test]
    fn push() {
        let (_td, repo) = crate::test::repo_init();
        let td2 = TempDir::new().unwrap();
        let td3 = TempDir::new().unwrap();
        let url = crate::test::path2url(&td2.path());

        let mut opts = crate::RepositoryInitOptions::new();
        opts.bare(true);
        opts.initial_head("main");
        Repository::init_opts(td2.path(), &opts).unwrap();
        // git push
        let mut remote = repo.remote("origin", &url).unwrap();
        let mut updated = false;
        {
            let mut callbacks = RemoteCallbacks::new();
            callbacks.push_update_reference(|refname, status| {
                updated = true;
                assert_eq!(refname, "refs/heads/main");
                assert_eq!(status, None);
                Ok(())
            });
            let mut options = PushOptions::new();
            options.remote_callbacks(callbacks);
            remote
                .push(&["refs/heads/main"], Some(&mut options))
                .unwrap();
        }
        assert!(updated);

        let repo = Repository::clone(&url, td3.path()).unwrap();
        let commit = repo.head().unwrap().target().unwrap();
        let commit = repo.find_commit(commit).unwrap();
        assert_eq!(commit.message(), Some("initial"));
    }

    #[test]
    fn prune() {
        let (td, remote_repo) = crate::test::repo_init();
        let oid = remote_repo.head().unwrap().target().unwrap();
        let commit = remote_repo.find_commit(oid).unwrap();
        remote_repo.branch("stale", &commit, true).unwrap();

        let td2 = TempDir::new().unwrap();
        let url = crate::test::path2url(&td.path());
        let repo = Repository::clone(&url, &td2).unwrap();

        fn assert_branch_count(repo: &Repository, count: usize) {
            assert_eq!(
                repo.branches(Some(crate::BranchType::Remote))
                    .unwrap()
                    .filter(|b| b.as_ref().unwrap().0.name().unwrap() == Some("origin/stale"))
                    .count(),
                count,
            );
        }

        assert_branch_count(&repo, 1);

        // delete `stale` branch on remote repo
        let mut stale_branch = remote_repo
            .find_branch("stale", crate::BranchType::Local)
            .unwrap();
        stale_branch.delete().unwrap();

        // prune
        let mut remote = repo.find_remote("origin").unwrap();
        remote.connect(Direction::Push).unwrap();
        let mut callbacks = RemoteCallbacks::new();
        callbacks.update_tips(|refname, _a, b| {
            assert_eq!(refname, "refs/remotes/origin/stale");
            assert!(b.is_zero());
            true
        });
        remote.prune(Some(callbacks)).unwrap();
        assert_branch_count(&repo, 0);
    }
}