Panic if libgit2 is not thread-aware
Go calling C is inherently multi-threaded. If libgit2 cannot handle
threading, then we're going to crash at some random point. Crash right
at the start so we know what's happening.
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
