[PATCH v2 6/6] clone: print advice on checking out detached HEAD

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Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@xxxxxxxxx>
---
 advice.c           |   14 ++++++++++++++
 advice.h           |    1 +
 builtin/checkout.c |   16 +---------------
 builtin/clone.c    |    5 ++++-
 4 files changed, 20 insertions(+), 16 deletions(-)

diff --git a/advice.c b/advice.c
index e02e632..3e1a145 100644
--- a/advice.c
+++ b/advice.c
@@ -64,3 +64,17 @@ void NORETURN die_resolve_conflict(const char *me)
 	error_resolve_conflict(me);
 	die("Exiting because of an unresolved conflict.");
 }
+
+void detach_advice(const char *new_name)
+{
+	const char fmt[] =
+	"Note: checking out '%s'.\n\n"
+	"You are in 'detached HEAD' state. You can look around, make experimental\n"
+	"changes and commit them, and you can discard any commits you make in this\n"
+	"state without impacting any branches by performing another checkout.\n\n"
+	"If you want to create a new branch to retain commits you create, you may\n"
+	"do so (now or later) by using -b with the checkout command again. Example:\n\n"
+	"  git checkout -b new_branch_name\n\n";
+
+	fprintf(stderr, fmt, new_name);
+}
diff --git a/advice.h b/advice.h
index e5d0af7..7bda45b 100644
--- a/advice.h
+++ b/advice.h
@@ -14,5 +14,6 @@ int git_default_advice_config(const char *var, const char *value);
 void advise(const char *advice, ...);
 int error_resolve_conflict(const char *me);
 extern void NORETURN die_resolve_conflict(const char *me);
+void detach_advice(const char *new_name);
 
 #endif /* ADVICE_H */
diff --git a/builtin/checkout.c b/builtin/checkout.c
index f1984d9..5bf96ba 100644
--- a/builtin/checkout.c
+++ b/builtin/checkout.c
@@ -514,20 +514,6 @@ static void report_tracking(struct branch_info *new)
 	strbuf_release(&sb);
 }
 
-static void detach_advice(const char *old_path, const char *new_name)
-{
-	const char fmt[] =
-	"Note: checking out '%s'.\n\n"
-	"You are in 'detached HEAD' state. You can look around, make experimental\n"
-	"changes and commit them, and you can discard any commits you make in this\n"
-	"state without impacting any branches by performing another checkout.\n\n"
-	"If you want to create a new branch to retain commits you create, you may\n"
-	"do so (now or later) by using -b with the checkout command again. Example:\n\n"
-	"  git checkout -b new_branch_name\n\n";
-
-	fprintf(stderr, fmt, new_name);
-}
-
 static void update_refs_for_switch(struct checkout_opts *opts,
 				   struct branch_info *old,
 				   struct branch_info *new)
@@ -575,7 +561,7 @@ static void update_refs_for_switch(struct checkout_opts *opts,
 			   REF_NODEREF, DIE_ON_ERR);
 		if (!opts->quiet) {
 			if (old->path && advice_detached_head)
-				detach_advice(old->path, new->name);
+				detach_advice(new->name);
 			describe_detached_head(_("HEAD is now at"), new->commit);
 		}
 	} else if (new->path) {	/* Switch branches. */
diff --git a/builtin/clone.c b/builtin/clone.c
index 0d4b9ab..52596db 100644
--- a/builtin/clone.c
+++ b/builtin/clone.c
@@ -467,7 +467,10 @@ static int checkout(void)
 			  "unable to checkout.\n"));
 		return 0;
 	}
-	if (strcmp(head, "HEAD")) {
+	if (!strcmp(head, "HEAD")) {
+		if (advice_detached_head)
+			detach_advice(sha1_to_hex(sha1));
+	} else {
 		if (prefixcmp(head, "refs/heads/"))
 			die(_("HEAD not found below refs/heads!"));
 	}
-- 
1.7.8.36.g69ee2

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