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-rw-r--r--sha1_file.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/sha1_file.c b/sha1_file.c
index 548535c844..63123cc47b 100644
--- a/sha1_file.c
+++ b/sha1_file.c
@@ -590,7 +590,9 @@ unsigned char* use_pack(struct packed_git *p,
PROT_READ, MAP_PRIVATE,
p->pack_fd, win->offset);
if (win->base == MAP_FAILED)
- die("packfile %s cannot be mapped.", p->pack_name);
+ die("packfile %s cannot be mapped: %s",
+ p->pack_name,
+ strerror(errno));
win->next = p->windows;
p->windows = win;
}