Merge pull request #354 from libgit2/cmn/panic-threading
Add Feature query support & panic if libgit2 is not thread-aware
diff --git a/features.go b/features.go
new file mode 100644
index 0000000..f6474a0
--- /dev/null
+++ b/features.go
@@ -0,0 +1,30 @@
+package git
+
+/*
+#include <git2.h>
+*/
+import "C"
+
+type Feature int
+
+const (
+ // libgit2 was built with threading support
+ FeatureThreads Feature = C.GIT_FEATURE_THREADS
+
+ // libgit2 was built with HTTPS support built-in
+ FeatureHttps Feature = C.GIT_FEATURE_HTTPS
+
+ // libgit2 was build with SSH support built-in
+ FeatureSsh Feature = C.GIT_FEATURE_SSH
+
+ // libgit2 was built with nanosecond support for files
+ FeatureNSec Feature = C.GIT_FEATURE_NSEC
+)
+
+// Features returns a bit-flag of Feature values indicating which features the
+// loaded libgit2 library has.
+func Features() Feature {
+ features := C.git_libgit2_features()
+
+ return Feature(features)
+}
diff --git a/git.go b/git.go
index a3c40e3..53b1a12 100644
--- a/git.go
+++ b/git.go
@@ -124,6 +124,15 @@
C.git_libgit2_init()
+ // Due to the multithreaded nature of Go and its interaction with
+ // calling C functions, we cannot work with a library that was not built
+ // with multi-threading support. The most likely outcome is a segfault
+ // or panic at an incomprehensible time, so let's make it easy by
+ // panicking right here.
+ if Features()&FeatureThreads == 0 {
+ panic("libgit2 was not built with threading support")
+ }
+
// This is not something we should be doing, as we may be
// stomping all over someone else's setup. The user should do
// this themselves or use some binding/wrapper which does it
