[PATCH v3 9/9] bugreport: print contents of alternates file

[Emily Shaffer <emilyshaffer@google.com>]

In some cases, it could be that the user is having a problem with an
object which isn't present in their normal object directory. We can get
a hint that that might be the case by examining the list of alternates
where their object may be stored instead.

Signed-off-by: Emily Shaffer <emilyshaffer@google.com>
---
 bugreport.c         | 14 ++++++++++++++
 bugreport.h         |  6 ++++++
 builtin/bugreport.c |  4 ++++
 3 files changed, 24 insertions(+)

diff --git a/bugreport.c b/bugreport.c
index ce15904fec..a7bdc72b7f 100644
--- a/bugreport.c
+++ b/bugreport.c
@@ -298,3 +298,17 @@ void get_object_info_summary(struct strbuf *obj_info)
 		strbuf_complete_line(obj_info);
 	}
 }
+
+void get_alternates_file(struct strbuf *alternates_info)
+{
+	struct strbuf alternates_path = STRBUF_INIT;
+
+	strbuf_addstr(&alternates_path, get_object_directory());
+	strbuf_complete(&alternates_path, '/');
+	strbuf_addstr(&alternates_path, "info/alternates");
+
+	strbuf_reset(alternates_info);
+	strbuf_addbuf(alternates_info, &alternates_path);
+	strbuf_complete_line(alternates_info);
+	strbuf_read_file(alternates_info, alternates_path.buf, 0);
+}
diff --git a/bugreport.h b/bugreport.h
index 4f5e2d1b9a..74d1f79960 100644
--- a/bugreport.h
+++ b/bugreport.h
@@ -36,3 +36,9 @@ void get_packed_object_summary(struct strbuf *obj_info);
  * previous contents of hook_info will be discarded.
  */
 void get_object_info_summary(struct strbuf *obj_info);
+
+/**
+ * Adds the contents of '.git/info/alternates'. The previous contents of
+ * alternates_info will be discarded.
+ */
+void get_alternates_file(struct strbuf *alt_info);
diff --git a/builtin/bugreport.c b/builtin/bugreport.c
index 8aad33a9b0..0784bdc42a 100644
--- a/builtin/bugreport.c
+++ b/builtin/bugreport.c
@@ -76,6 +76,10 @@ int cmd_bugreport(int argc, const char **argv, const char *prefix)
 	get_object_info_summary(&buffer);
 	strbuf_write(&buffer, report);
 
+	add_header(report, "Alternates File");
+	get_alternates_file(&buffer);
+	strbuf_write(&buffer, report);
+
 	// Close file
 	// open file in editor
 	launch_editor(report_path, NULL, NULL);
-- 
2.24.0.rc0.303.g954a862665-goog