-
Notifications
You must be signed in to change notification settings - Fork 20
/
lib.rs
1947 lines (1749 loc) · 69.6 KB
/
lib.rs
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
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
//! A build dependency for Cargo libraries to find libraries in a
//! [Vcpkg](https://github.com/microsoft/vcpkg) tree
//!
//! From a Vcpkg package name
//! this build helper will emit cargo metadata to link it and it's dependencies
//! (excluding system libraries, which it does not determine).
//!
//! The simplest possible usage looks like this :-
//!
//! ```rust,no_run
//! // build.rs
//! vcpkg::find_package("libssh2").unwrap();
//! ```
//!
//! The cargo metadata that is emitted can be changed like this :-
//!
//! ```rust,no_run
//! // build.rs
//! vcpkg::Config::new()
//! .emit_includes(true)
//! .find_package("zlib").unwrap();
//! ```
//!
//! If the search was successful all appropriate Cargo metadata will be printed
//! to stdout.
//!
//! # Static vs. dynamic linking
//! ## Linux and Mac
//! At this time, vcpkg has a single triplet on macOS and Linux, which builds
//! static link versions of libraries. This triplet works well with Rust. It is also possible
//! to select a custom triplet using the `VCPKGRS_TRIPLET` environment variable.
//! ## Windows
//! On Windows there are three
//! configurations that are supported for 64-bit builds and another three for 32-bit.
//! The default 64-bit configuration is `x64-windows-static-md` which is a
//! [community supported](https://github.com/microsoft/vcpkg/blob/master/docs/users/triplets.md#community-triplets)
//! configuration that is a good match for Rust - dynamically linking to the C runtime,
//! and statically linking to the packages in vcpkg.
//!
//! Another option is to build a fully static
//! binary using `RUSTFLAGS=-Ctarget-feature=+crt-static`. This will link to libraries built
//! with vcpkg triplet `x64-windows-static`.
//!
//! For dynamic linking, set `VCPKGRS_DYNAMIC=1` in the
//! environment. This will link to libraries built with vcpkg triplet `x64-windows`. If `VCPKGRS_DYNAMIC` is set, `cargo install` will
//! generate dynamically linked binaries, in which case you will have to arrange for
//! dlls from your Vcpkg installation to be available in your path.
//!
//! # Environment variables
//!
//! A number of environment variables are available to globally configure which
//! libraries are selected.
//!
//! * `VCPKG_ROOT` - Set the directory to look in for a vcpkg installation. If
//! it is not set, vcpkg will use the user-wide installation if one has been
//! set up with `vcpkg integrate install`, and check the crate source and target
//! to see if a vcpkg tree has been created by [cargo-vcpkg](https://crates.io/crates/cargo-vcpkg).
//!
//! * `VCPKGRS_TRIPLET` - Use this to override vcpkg-rs' default triplet selection with your own.
//! This is how to select a custom vcpkg triplet.
//!
//! * `VCPKGRS_NO_FOO` - if set, vcpkg-rs will not attempt to find the
//! library named `foo`.
//!
//! * `VCPKGRS_DISABLE` - if set, vcpkg-rs will not attempt to find any libraries.
//!
//! * `VCPKGRS_DYNAMIC` - if set, vcpkg-rs will link to DLL builds of ports.
//! # Related tools
//! ## cargo vcpkg
//! [`cargo vcpkg`](https://crates.io/crates/cargo-vcpkg) can fetch and build a vcpkg installation of
//! required packages from scratch. It merges package requirements specified in the `Cargo.toml` of
//! crates in the dependency tree.
//! ## vcpkg_cli
//! There is also a rudimentary companion crate, `vcpkg_cli` that allows testing of environment
//! and flag combinations.
//!
//! ```Batchfile
//! C:\src> vcpkg_cli probe -l static mysqlclient
//! Found library mysqlclient
//! Include paths:
//! C:\src\[..]\vcpkg\installed\x64-windows-static\include
//! Library paths:
//! C:\src\[..]\vcpkg\installed\x64-windows-static\lib
//! Cargo metadata:
//! cargo:rustc-link-search=native=C:\src\[..]\vcpkg\installed\x64-windows-static\lib
//! cargo:rustc-link-lib=static=mysqlclient
//! ```
// The CI will test vcpkg-rs on 1.12 because that is how far back vcpkg-rs 0.2 tries to be
// compatible (was actually 1.10 see #29). This was originally based on how far back
// rust-openssl's openssl-sys was backward compatible when this crate originally released.
//
// This will likely get bumped by the next major release.
#![allow(deprecated)]
#![allow(warnings)]
#[cfg(test)]
#[macro_use]
extern crate lazy_static;
#[allow(unused_imports)]
use std::ascii::AsciiExt;
use std::collections::BTreeMap;
use std::collections::HashMap;
use std::env;
use std::error;
use std::ffi::OsStr;
use std::fmt;
use std::fs::{self, File};
use std::io::{BufRead, BufReader, Read};
use std::path::{Path, PathBuf};
/// Configuration options for finding packages, setting up the tree and emitting metadata to cargo
#[derive(Default)]
pub struct Config {
/// should the cargo metadata actually be emitted
cargo_metadata: bool,
/// should cargo:include= metadata be emitted (defaults to false)
emit_includes: bool,
/// .lib/.a files that must be be found for probing to be considered successful
required_libs: Vec<String>,
/// .dlls that must be be found for probing to be considered successful
required_dlls: Vec<String>,
/// should DLLs be copied to OUT_DIR?
copy_dlls: bool,
/// override VCPKG_ROOT environment variable
vcpkg_root: Option<PathBuf>,
target: Option<TargetTriplet>,
}
/// Details of a package that was found
#[derive(Debug)]
pub struct Library {
/// Paths for the linker to search for static or import libraries
pub link_paths: Vec<PathBuf>,
/// Paths to search at runtme to find DLLs
pub dll_paths: Vec<PathBuf>,
/// Paths to include files
pub include_paths: Vec<PathBuf>,
/// cargo: metadata lines
pub cargo_metadata: Vec<String>,
/// libraries found are static
pub is_static: bool,
/// DLLs found
pub found_dlls: Vec<PathBuf>,
/// static libs or import libs found
pub found_libs: Vec<PathBuf>,
/// link name of libraries found, this is useful to emit linker commands
pub found_names: Vec<String>,
/// ports that are providing the libraries to link to, in port link order
pub ports: Vec<String>,
/// the vcpkg triplet that has been selected
pub vcpkg_triplet: String,
}
#[derive(Clone)]
struct TargetTriplet {
triplet: String,
is_static: bool,
lib_suffix: String,
strip_lib_prefix: bool,
}
impl<S: AsRef<str>> From<S> for TargetTriplet {
fn from(triplet: S) -> TargetTriplet {
let triplet = triplet.as_ref();
if triplet.contains("windows") {
TargetTriplet {
triplet: triplet.into(),
is_static: triplet.contains("-static"),
lib_suffix: "lib".into(),
strip_lib_prefix: false,
}
} else {
TargetTriplet {
triplet: triplet.into(),
is_static: true,
lib_suffix: "a".into(),
strip_lib_prefix: true,
}
}
}
}
#[derive(Debug)] // need Display?
pub enum Error {
/// Aborted because of a `VCPKGRS_NO_*` environment variable.
///
/// Contains the name of the responsible environment variable.
DisabledByEnv(String),
/// Aborted because a required environment variable was not set.
RequiredEnvMissing(String),
/// On Windows, only MSVC ABI is supported
NotMSVC,
/// Can't find a vcpkg tree
VcpkgNotFound(String),
/// Library not found in vcpkg tree
LibNotFound(String),
/// Could not understand vcpkg installation
VcpkgInstallation(String),
#[doc(hidden)]
__Nonexhaustive,
}
impl error::Error for Error {
fn description(&self) -> &str {
match *self {
Error::DisabledByEnv(_) => "vcpkg-rs requested to be aborted",
Error::RequiredEnvMissing(_) => "a required env setting is missing",
Error::NotMSVC => "vcpkg-rs only can only find libraries for MSVC ABI builds",
Error::VcpkgNotFound(_) => "could not find Vcpkg tree",
Error::LibNotFound(_) => "could not find library in Vcpkg tree",
Error::VcpkgInstallation(_) => "could not look up details of packages in vcpkg tree",
Error::__Nonexhaustive => panic!(),
}
}
fn cause(&self) -> Option<&error::Error> {
match *self {
// Error::Command { ref cause, .. } => Some(cause),
_ => None,
}
}
}
impl fmt::Display for Error {
fn fmt(&self, f: &mut fmt::Formatter) -> Result<(), fmt::Error> {
match *self {
Error::DisabledByEnv(ref name) => write!(f, "Aborted because {} is set", name),
Error::RequiredEnvMissing(ref name) => write!(f, "Aborted because {} is not set", name),
Error::NotMSVC => write!(
f,
"the vcpkg-rs Vcpkg build helper can only find libraries built for the MSVC ABI."
),
Error::VcpkgNotFound(ref detail) => write!(f, "Could not find Vcpkg tree: {}", detail),
Error::LibNotFound(ref detail) => {
write!(f, "Could not find library in Vcpkg tree {}", detail)
}
Error::VcpkgInstallation(ref detail) => write!(
f,
"Could not look up details of packages in vcpkg tree {}",
detail
),
Error::__Nonexhaustive => panic!(),
}
}
}
/// Deprecated in favor of the find_package function
#[doc(hidden)]
pub fn probe_package(name: &str) -> Result<Library, Error> {
Config::new().probe(name)
}
/// Find the package `package` in a Vcpkg tree.
///
/// Emits cargo metadata to link to libraries provided by the Vcpkg package/port
/// named, and any (non-system) libraries that they depend on.
///
/// This will select the architecture and linkage based on environment
/// variables and build flags as described in the module docs.
pub fn find_package(package: &str) -> Result<Library, Error> {
Config::new().find_package(package)
}
/// Find the vcpkg root
#[doc(hidden)]
pub fn find_vcpkg_root(cfg: &Config) -> Result<PathBuf, Error> {
// prefer the setting from the use if there is one
if let &Some(ref path) = &cfg.vcpkg_root {
return Ok(path.clone());
}
// otherwise, use the setting from the environment
if let Some(path) = env::var_os("VCPKG_ROOT") {
return Ok(PathBuf::from(path));
}
// see if there is a per-user vcpkg tree that has been integrated into msbuild
// using `vcpkg integrate install`
if let Ok(ref local_app_data) = env::var("LOCALAPPDATA") {
let vcpkg_user_targets_path = Path::new(local_app_data.as_str())
.join("vcpkg")
.join("vcpkg.user.targets");
if let Ok(file) = File::open(vcpkg_user_targets_path.clone()) {
let file = BufReader::new(&file);
for line in file.lines() {
let line = try!(line.map_err(|_| Error::VcpkgNotFound(format!(
"Parsing of {} failed.",
vcpkg_user_targets_path.to_string_lossy().to_owned()
))));
let mut split = line.split("Project=\"");
split.next(); // eat anything before Project="
if let Some(found) = split.next() {
// " is illegal in a Windows pathname
if let Some(found) = found.split_terminator('"').next() {
let mut vcpkg_root = PathBuf::from(found);
if !(vcpkg_root.pop()
&& vcpkg_root.pop()
&& vcpkg_root.pop()
&& vcpkg_root.pop())
{
return Err(Error::VcpkgNotFound(format!(
"Could not find vcpkg root above {}",
found
)));
}
return Ok(vcpkg_root);
}
}
}
// return Err(Error::VcpkgNotFound(format!(
// "Project location not found parsing {}.",
// vcpkg_user_targets_path.to_string_lossy().to_owned()
// )));
}
}
// walk up the directory structure and see if it is there
if let Some(path) = env::var_os("OUT_DIR") {
// path.ancestors() is supported from Rust 1.28
let mut path = PathBuf::from(path);
while path.pop() {
let mut try_root = path.clone();
try_root.push("vcpkg");
try_root.push(".vcpkg-root");
if try_root.exists() {
try_root.pop();
// this could walk up beyond the target directory and find a vcpkg installation
// that would not have been found by previous versions of vcpkg-rs, so this
// checks that the vcpkg tree was created by cargo-vcpkg and ignores it if not.
let mut cv_cfg = try_root.clone();
cv_cfg.push("downloads");
cv_cfg.push("cargo-vcpkg.toml");
if cv_cfg.exists() {
return Ok(try_root);
}
}
}
}
Err(Error::VcpkgNotFound(
"No vcpkg installation found. Set the VCPKG_ROOT environment \
variable or run 'vcpkg integrate install'"
.to_string(),
))
}
fn validate_vcpkg_root(path: &PathBuf) -> Result<(), Error> {
let mut vcpkg_root_path = path.clone();
vcpkg_root_path.push(".vcpkg-root");
if vcpkg_root_path.exists() {
Ok(())
} else {
Err(Error::VcpkgNotFound(format!(
"Could not find Vcpkg root at {}",
vcpkg_root_path.to_string_lossy()
)))
}
}
fn find_vcpkg_target(cfg: &Config, target_triplet: &TargetTriplet) -> Result<VcpkgTarget, Error> {
let vcpkg_root = try!(find_vcpkg_root(&cfg));
try!(validate_vcpkg_root(&vcpkg_root));
let mut base = vcpkg_root.clone();
base.push("installed");
let status_path = base.join("vcpkg");
base.push(&target_triplet.triplet);
let lib_path = base.join("lib");
let bin_path = base.join("bin");
let include_path = base.join("include");
let packages_path = vcpkg_root.join("packages");
Ok(VcpkgTarget {
lib_path: lib_path,
bin_path: bin_path,
include_path: include_path,
status_path: status_path,
packages_path: packages_path,
target_triplet: target_triplet.clone(),
})
}
/// Parsed knowledge from a .pc file.
#[derive(Debug)]
struct PcFile {
/// The pkg-config name of this library.
id: String,
/// List of libraries found as '-l', translated to a given vcpkg_target. e.g. libbrotlicommon.a
libs: Vec<String>,
/// List of pkgconfig dependencies, e.g. PcFile::id.
deps: Vec<String>,
}
impl PcFile {
fn parse_pc_file(vcpkg_target: &VcpkgTarget, path: &Path) -> Result<Self, Error> {
// Extract the pkg-config name.
let id = try!(path
.file_stem()
.ok_or_else(|| Error::VcpkgInstallation(format!(
"pkg-config file {} has bogus name",
path.to_string_lossy()
))))
.to_string_lossy();
// Read through the file and gather what we want.
let mut file = try!(File::open(path)
.map_err(|_| Error::VcpkgInstallation(format!("Couldn't open {}", path.display()))));
let mut pc_file_contents = String::new();
try!(file
.read_to_string(&mut pc_file_contents)
.map_err(|_| Error::VcpkgInstallation(format!("Couldn't read {}", path.display()))));
PcFile::from_str(&id, &pc_file_contents, &vcpkg_target.target_triplet)
}
fn from_str(id: &str, s: &str, target_triplet: &TargetTriplet) -> Result<Self, Error> {
let mut libs = Vec::new();
let mut deps = Vec::new();
for line in s.lines() {
// We could collect a lot of stuff here, but we only care about Requires and Libs for the moment.
if line.starts_with("Requires:") {
let mut requires_args = line
.split(":")
.skip(1)
.next()
.unwrap_or("")
.split_whitespace()
.flat_map(|e| e.split(","))
.filter(|s| *s != "");
while let Some(dep) = requires_args.next() {
// Drop any versioning requirements, we only care about library order and rely upon
// port dependencies to resolve versioning.
if let Some(_) = dep.find(|c| c == '=' || c == '<' || c == '>') {
requires_args.next();
continue;
}
deps.push(dep.to_owned());
}
} else if line.starts_with("Libs:") {
let lib_flags = line
.split(":")
.skip(1)
.next()
.unwrap_or("")
.split_whitespace();
for lib_flag in lib_flags {
if lib_flag.starts_with("-l") {
// reconstruct the library name.
let lib = format!(
"{}{}.{}",
if target_triplet.strip_lib_prefix {
"lib"
} else {
""
},
lib_flag.trim_left_matches("-l"),
target_triplet.lib_suffix
);
libs.push(lib);
}
}
}
}
Ok(PcFile {
id: id.to_string(),
libs: libs,
deps: deps,
})
}
}
/// Collection of PcFile. Can be built and queried as a set of .pc files.
#[derive(Debug)]
struct PcFiles {
files: HashMap<String, PcFile>,
}
impl PcFiles {
fn load_pkgconfig_dir(vcpkg_target: &VcpkgTarget, path: &PathBuf) -> Result<Self, Error> {
let mut files = HashMap::new();
for dir_entry in try!(path.read_dir().map_err(|e| {
Error::VcpkgInstallation(format!(
"Missing pkgconfig directory {}: {}",
path.to_string_lossy(),
e
))
})) {
let dir_entry = try!(dir_entry.map_err(|e| {
Error::VcpkgInstallation(format!(
"Troubling reading pkgconfig dir {}: {}",
path.to_string_lossy(),
e
))
}));
// Only look at .pc files.
if dir_entry.path().extension() != Some(OsStr::new("pc")) {
continue;
}
let pc_file = try!(PcFile::parse_pc_file(vcpkg_target, &dir_entry.path()));
files.insert(pc_file.id.to_owned(), pc_file);
}
Ok(PcFiles { files: files })
}
/// Use the .pc files as a hint to the library sort order.
fn fix_ordering(&self, mut libs: Vec<String>) -> Vec<String> {
// Overall heuristic: for each library given as input, identify which PcFile declared it.
// Then, looking at that PcFile, check its Requires: (deps), and if the pc file for that
// dep is in our set, check if its libraries are in our set of libs. If so, move it to the
// end to ensure it gets linked afterwards.
// We may need to do this a few times to properly handle the case where A -> (depends on) B
// -> C -> D and libraries were originally sorted D, C, B, A. Avoid recursion so we don't
// have to detect potential cycles.
for _iter in 0..3 {
let mut required_lib_order: Vec<String> = Vec::new();
for lib in &libs {
required_lib_order.push(lib.to_owned());
if let Some(pc_file) = self.locate_pc_file_by_lib(lib) {
// Consider its requirements:
for dep in &pc_file.deps {
// Only consider pkgconfig dependencies we know about.
if let Some(dep_pc_file) = self.files.get(dep) {
// Intra-port library ordering found, pivot any already seen dep_lib to the
// end of the list.
for dep_lib in &dep_pc_file.libs {
if let Some(removed) = remove_item(&mut required_lib_order, dep_lib)
{
required_lib_order.push(removed);
}
}
}
}
}
}
// We should always end up with the same number of libraries, only their order should
// change.
assert_eq!(libs.len(), required_lib_order.len());
// Termination:
if required_lib_order == libs {
// Nothing changed, we're done here.
return libs;
}
libs = required_lib_order;
}
println!("cargo:warning=vcpkg gave up trying to resolve pkg-config ordering.");
libs
}
/// Locate which PcFile contains this library, if any.
fn locate_pc_file_by_lib(&self, lib: &str) -> Option<&PcFile> {
for (id, pc_file) in &self.files {
if pc_file.libs.contains(&lib.to_owned()) {
return Some(pc_file);
}
}
None
}
}
#[derive(Clone, Debug)]
struct Port {
// dlls if any
dlls: Vec<String>,
// libs (static or import)
libs: Vec<String>,
// ports that this port depends on
deps: Vec<String>,
}
fn load_port_manifest(
path: &PathBuf,
port: &str,
version: &str,
vcpkg_target: &VcpkgTarget,
) -> Result<(Vec<String>, Vec<String>), Error> {
let manifest_file = path.join("info").join(format!(
"{}_{}_{}.list",
port, version, vcpkg_target.target_triplet.triplet
));
let mut dlls = Vec::new();
let mut libs = Vec::new();
let f = try!(
File::open(&manifest_file).map_err(|_| Error::VcpkgInstallation(format!(
"Could not open port manifest file {}",
manifest_file.display()
)))
);
let file = BufReader::new(&f);
let dll_prefix = Path::new(&vcpkg_target.target_triplet.triplet).join("bin");
let lib_prefix = Path::new(&vcpkg_target.target_triplet.triplet).join("lib");
for line in file.lines() {
let line = line.unwrap();
let file_path = Path::new(&line);
if let Ok(dll) = file_path.strip_prefix(&dll_prefix) {
if dll.extension() == Some(OsStr::new("dll"))
&& dll.components().collect::<Vec<_>>().len() == 1
{
// match "mylib.dll" but not "debug/mylib.dll" or "manual_link/mylib.dll"
dll.to_str().map(|s| dlls.push(s.to_owned()));
}
} else if let Ok(lib) = file_path.strip_prefix(&lib_prefix) {
if lib.extension() == Some(OsStr::new(&vcpkg_target.target_triplet.lib_suffix))
&& lib.components().collect::<Vec<_>>().len() == 1
{
if let Some(lib) = vcpkg_target.link_name_for_lib(lib) {
libs.push(lib);
}
}
}
}
// Load .pc files for hints about intra-port library ordering.
let pkg_config_prefix = vcpkg_target
.packages_path
.join(format!("{}_{}", port, vcpkg_target.target_triplet.triplet))
.join("lib")
.join("pkgconfig");
// Try loading the pc files, if they are present. Not all ports have pkgconfig.
if let Ok(pc_files) = PcFiles::load_pkgconfig_dir(vcpkg_target, &pkg_config_prefix) {
// Use the .pc file data to potentially sort the libs to the correct order.
libs = pc_files.fix_ordering(libs);
}
Ok((dlls, libs))
}
// load ports from the status file or one of the incremental updates
fn load_port_file(
filename: &PathBuf,
port_info: &mut Vec<BTreeMap<String, String>>,
) -> Result<(), Error> {
let f = try!(
File::open(&filename).map_err(|e| Error::VcpkgInstallation(format!(
"Could not open status file at {}: {}",
filename.display(),
e
)))
);
let file = BufReader::new(&f);
let mut current: BTreeMap<String, String> = BTreeMap::new();
for line in file.lines() {
let line = line.unwrap();
let parts = line.splitn(2, ": ").clone().collect::<Vec<_>>();
if parts.len() == 2 {
// a key: value line
current.insert(parts[0].trim().into(), parts[1].trim().into());
} else if line.len() == 0 {
// end of section
port_info.push(current.clone());
current.clear();
} else {
// ignore all extension lines of the form
//
// Description: a package with a
// very long description
//
// the description key is not used so this is harmless but
// this will eat extension lines for any multiline key which
// could become an issue in future
}
}
if !current.is_empty() {
port_info.push(current);
}
Ok(())
}
fn load_ports(target: &VcpkgTarget) -> Result<BTreeMap<String, Port>, Error> {
let mut ports: BTreeMap<String, Port> = BTreeMap::new();
let mut port_info: Vec<BTreeMap<String, String>> = Vec::new();
// load the main status file. It is not an error if this file does not
// exist. If the only command that has been run in a Vcpkg installation
// is a single `vcpkg install package` then there will likely be no
// status file, only incremental updates. This is the typical case when
// running in a CI environment.
let status_filename = target.status_path.join("status");
load_port_file(&status_filename, &mut port_info).ok();
// load updates to the status file that have yet to be normalized
let status_update_dir = target.status_path.join("updates");
let paths = try!(
fs::read_dir(status_update_dir).map_err(|e| Error::VcpkgInstallation(format!(
"could not read status file updates dir: {}",
e
)))
);
// get all of the paths of the update files into a Vec<PathBuf>
let mut paths = try!(paths
.map(|rde| rde.map(|de| de.path())) // Result<DirEntry, io::Error> -> Result<PathBuf, io::Error>
.collect::<Result<Vec<_>, _>>() // collect into Result<Vec<PathBuf>, io::Error>
.map_err(|e| {
Error::VcpkgInstallation(format!(
"could not read status file update filenames: {}",
e
))
}));
// Sort the paths and read them. This could be done directly from the iterator if
// read_dir() guarantees that the files will be read in alpha order but that appears
// to be unspecified as the underlying operating system calls used are unspecified
// https://doc.rust-lang.org/nightly/std/fs/fn.read_dir.html#platform-specific-behavior
paths.sort();
for path in paths {
// println!("Name: {}", path.display());
try!(load_port_file(&path, &mut port_info));
}
//println!("{:#?}", port_info);
let mut seen_names = BTreeMap::new();
for current in &port_info {
// store them by name and arch, clobbering older details
match (
current.get("Package"),
current.get("Architecture"),
current.get("Feature"),
) {
(Some(pkg), Some(arch), feature) => {
seen_names.insert((pkg, arch, feature), current);
}
_ => {}
}
}
for (&(name, arch, feature), current) in &seen_names {
if **arch == target.target_triplet.triplet {
let mut deps = if let Some(deps) = current.get("Depends") {
deps.split(", ").map(|x| x.to_owned()).collect()
} else {
Vec::new()
};
if current
.get("Status")
.unwrap_or(&String::new())
.ends_with(" installed")
{
match (current.get("Version"), feature) {
(Some(version), _) => {
// this failing here and bailing out causes everything to fail
let lib_info = try!(load_port_manifest(
&target.status_path,
&name,
version,
&target
));
let port = Port {
dlls: lib_info.0,
libs: lib_info.1,
deps: deps,
};
ports.insert(name.to_string(), port);
}
(_, Some(_feature)) => match ports.get_mut(name) {
Some(ref mut port) => {
port.deps.append(&mut deps);
}
_ => {
println!("found a feature that had no corresponding port :-");
println!("current {:+?}", current);
continue;
}
},
(_, _) => {
println!("didn't know how to deal with status file entry :-");
println!("{:+?}", current);
continue;
}
}
}
}
}
Ok(ports)
}
/// paths and triple for the chosen target
struct VcpkgTarget {
lib_path: PathBuf,
bin_path: PathBuf,
include_path: PathBuf,
// directory containing the status file
status_path: PathBuf,
// directory containing the install files per port.
packages_path: PathBuf,
// target-specific settings.
target_triplet: TargetTriplet,
}
impl VcpkgTarget {
fn link_name_for_lib(&self, filename: &std::path::Path) -> Option<String> {
if self.target_triplet.strip_lib_prefix {
filename.to_str().map(|s| s.to_owned())
// filename
// .to_str()
// .map(|s| s.trim_left_matches("lib").to_owned())
} else {
filename.to_str().map(|s| s.to_owned())
}
}
}
impl Config {
pub fn new() -> Config {
Config {
cargo_metadata: true,
copy_dlls: true,
..Default::default()
}
}
fn get_target_triplet(&mut self) -> Result<TargetTriplet, Error> {
if self.target.is_none() {
let target = if let Ok(triplet_str) = env::var("VCPKGRS_TRIPLET") {
triplet_str.into()
} else {
try!(msvc_target())
};
self.target = Some(target);
}
Ok(self.target.as_ref().unwrap().clone())
}
/// Find the package `port_name` in a Vcpkg tree.
///
/// Emits cargo metadata to link to libraries provided by the Vcpkg package/port
/// named, and any (non-system) libraries that they depend on.
///
/// This will select the architecture and linkage based on environment
/// variables and build flags as described in the module docs, and any configuration
/// set on the builder.
pub fn find_package(&mut self, port_name: &str) -> Result<Library, Error> {
// determine the target type, bailing out if it is not some
// kind of msvc
let msvc_target = try!(self.get_target_triplet());
// bail out if requested to not try at all
if env::var_os("VCPKGRS_DISABLE").is_some() {
return Err(Error::DisabledByEnv("VCPKGRS_DISABLE".to_owned()));
}
// bail out if requested to not try at all (old)
if env::var_os("NO_VCPKG").is_some() {
return Err(Error::DisabledByEnv("NO_VCPKG".to_owned()));
}
// bail out if requested to skip this package
let abort_var_name = format!("VCPKGRS_NO_{}", envify(port_name));
if env::var_os(&abort_var_name).is_some() {
return Err(Error::DisabledByEnv(abort_var_name));
}
// bail out if requested to skip this package (old)
let abort_var_name = format!("{}_NO_VCPKG", envify(port_name));
if env::var_os(&abort_var_name).is_some() {
return Err(Error::DisabledByEnv(abort_var_name));
}
let vcpkg_target = try!(find_vcpkg_target(&self, &msvc_target));
let mut required_port_order = Vec::new();
// if no overrides have been selected, then the Vcpkg port name
// is the the .lib name and the .dll name
if self.required_libs.is_empty() {
let ports = try!(load_ports(&vcpkg_target));
if ports.get(&port_name.to_owned()).is_none() {
return Err(Error::LibNotFound(format!(
"package {} is not installed for vcpkg triplet {}",
port_name.to_owned(),
vcpkg_target.target_triplet.triplet
)));
}
// the complete set of ports required
let mut required_ports: BTreeMap<String, Port> = BTreeMap::new();
// working of ports that we need to include
// let mut ports_to_scan: BTreeSet<String> = BTreeSet::new();
// ports_to_scan.insert(port_name.to_owned());
let mut ports_to_scan = vec![port_name.to_owned()]; //: Vec<String> = BTreeSet::new();
while !ports_to_scan.is_empty() {
let port_name = ports_to_scan.pop().unwrap();
if required_ports.contains_key(&port_name) {
continue;
}
if let Some(port) = ports.get(&port_name) {
for dep in &port.deps {
ports_to_scan.push(dep.clone());
}
required_ports.insert(port_name.clone(), (*port).clone());
remove_item(&mut required_port_order, &port_name);
required_port_order.push(port_name);
} else {
// what?
}
}
// for port in ports {
// println!("port {:?}", port);
// }
// println!("== Looking for port {}", port_name);
// for port in &required_port_order {
// println!("ordered required port {:?}", port);
// }
// println!("=============================");
// for port in &required_ports {
// println!("required port {:?}", port);
// }
// if no overrides have been selected, then the Vcpkg port name
// is the the .lib name and the .dll name
if self.required_libs.is_empty() {
for port_name in &required_port_order {
let port = required_ports.get(port_name).unwrap();
self.required_libs.extend(port.libs.iter().map(|s| {
Path::new(&s)
.file_stem()
.unwrap()
.to_string_lossy()
.into_owned()
}));
self.required_dlls
.extend(port.dlls.iter().cloned().map(|s| {
Path::new(&s)
.file_stem()
.unwrap()
.to_string_lossy()
.into_owned()
}));
}
}
}
// require explicit opt-in before using dynamically linked
// variants, otherwise cargo install of various things will
// stop working if Vcpkg is installed.
if !vcpkg_target.target_triplet.is_static && !env::var_os("VCPKGRS_DYNAMIC").is_some() {
return Err(Error::RequiredEnvMissing("VCPKGRS_DYNAMIC".to_owned()));
}
let mut lib = Library::new(
vcpkg_target.target_triplet.is_static,
&vcpkg_target.target_triplet.triplet,
);
if self.emit_includes {
lib.cargo_metadata.push(format!(
"cargo:include={}",
vcpkg_target.include_path.display()
));
}