Set GIT_EOSERR when the OS errno should be consulted

This error code indicates the OS error code has a better value
describing the last error, as it is likely a network or local
file IO problem identified by a C library function call.

Signed-off-by: Shawn O. Pearce <spearce@spearce.org>

1 files changed, 3 insertions, 0 deletions

diff --git a/src/errors.c b/src/errors.c
index deb106bfd..f3489977f 100644
--- a/src/errors.c
+++ b/src/errors.c
@@ -41,6 +41,9 @@ static struct {
 const char *git_strerror(int num)
 {
 	int i;
+
+	if (num == GIT_EOSERR)
+		return strerror(errno);
 	for (i = 0; i < ARRAY_SIZE(error_codes); i++)
 		if (num == error_codes[i].num)
 			return error_codes[i].str;