Re: [PATCH 05/11] reset_head(): factor out ref updates

"Phillip Wood via GitGitGadget" [off-list ref] writes:

From: Phillip Wood <redacted>

In the next commit we will stop trying to update HEAD when we are just
clearing changes from the working tree. Move the code that updates the

"clearing changes" meaning...?  Like "rebase --abort"?

Hi Junio

On 01/10/2021 22:00, Junio C Hamano wrote:

"Phillip Wood via GitGitGadget" [off-list ref] writes:

quoted

From: Phillip Wood <redacted>

In the next commit we will stop trying to update HEAD when we are just
clearing changes from the working tree. Move the code that updates the

"clearing changes" meaning...?  Like "rebase --abort"?

"rebase --abort" will update HEAD, "rebase --skip" would be a better 
example, I'll expand the commit message.

Best Wishes

Phillip

quoted

refs to its own function in preparation for that.

Signed-off-by: Phillip Wood <redacted>
---
  reset.c | 112 +++++++++++++++++++++++++++++++-------------------------
  1 file changed, 62 insertions(+), 50 deletions(-)

diff --git a/reset.c b/reset.c
index 9ab007c0c34..668c7639127 100644
--- a/reset.c
+++ b/reset.c

@@ -8,26 +8,75 @@
  #include "tree.h"
  #include "unpack-trees.h"
  
+static int update_refs(const struct object_id *oid, const char *switch_to_branch,
+		       const char *reflog_head, const char *reflog_orig_head,
+		       const char *default_reflog_action, unsigned flags)
+{
+	unsigned detach_head = flags & RESET_HEAD_DETACH;
+	unsigned run_hook = flags & RESET_HEAD_RUN_POST_CHECKOUT_HOOK;
+	unsigned update_orig_head = flags & RESET_ORIG_HEAD;
+	struct object_id *orig = NULL, oid_orig, *old_orig = NULL, oid_old_orig;
+	struct strbuf msg = STRBUF_INIT;
+	const char *reflog_action;
+	size_t prefix_len;
+	int ret;
+
+	reflog_action = getenv(GIT_REFLOG_ACTION_ENVIRONMENT);
+	strbuf_addf(&msg, "%s: ", reflog_action ? reflog_action : default_reflog_action);
+	prefix_len = msg.len;
+
+	if (update_orig_head) {
+		if (!get_oid("ORIG_HEAD", &oid_old_orig))
+			old_orig = &oid_old_orig;
+		if (!get_oid("HEAD", &oid_orig)) {
+			orig = &oid_orig;
+			if (!reflog_orig_head) {
+				strbuf_addstr(&msg, "updating ORIG_HEAD");
+				reflog_orig_head = msg.buf;
+			}
+			update_ref(reflog_orig_head, "ORIG_HEAD", orig,
+				   old_orig, 0, UPDATE_REFS_MSG_ON_ERR);
+		} else if (old_orig)
+			delete_ref(NULL, "ORIG_HEAD", old_orig, 0);
+	}
+
+	if (!reflog_head) {
+		strbuf_setlen(&msg, prefix_len);
+		strbuf_addstr(&msg, "updating HEAD");
+		reflog_head = msg.buf;
+	}
+	if (!switch_to_branch)
+		ret = update_ref(reflog_head, "HEAD", oid, orig,
+				 detach_head ? REF_NO_DEREF : 0,
+				 UPDATE_REFS_MSG_ON_ERR);
+	else {
+		ret = update_ref(reflog_head, switch_to_branch, oid,
+				 NULL, 0, UPDATE_REFS_MSG_ON_ERR);
+		if (!ret)
+			ret = create_symref("HEAD", switch_to_branch,
+					    reflog_head);
+	}
+	if (!ret && run_hook)
+		run_hook_le(NULL, "post-checkout",
+			    oid_to_hex(orig ? orig : null_oid()),
+			    oid_to_hex(oid), "1", NULL);
+	strbuf_release(&msg);
+	return ret;
+}
+
  int reset_head(struct repository *r, struct object_id *oid,
  	       const char *switch_to_branch, unsigned flags,
  	       const char *reflog_orig_head, const char *reflog_head,
  	       const char *default_reflog_action)
  {
-	unsigned detach_head = flags & RESET_HEAD_DETACH;
  	unsigned reset_hard = flags & RESET_HEAD_HARD;
-	unsigned run_hook = flags & RESET_HEAD_RUN_POST_CHECKOUT_HOOK;
  	unsigned refs_only = flags & RESET_HEAD_REFS_ONLY;
-	unsigned update_orig_head = flags & RESET_ORIG_HEAD;
  	struct object_id head_oid;
  	struct tree_desc desc[2] = { { NULL }, { NULL } };
  	struct lock_file lock = LOCK_INIT;
  	struct unpack_trees_options unpack_tree_opts = { 0 };
  	struct tree *tree;
-	const char *action, *reflog_action;
-	struct strbuf msg = STRBUF_INIT;
-	size_t prefix_len;
-	struct object_id *orig = NULL, oid_orig,
-		*old_orig = NULL, oid_old_orig;
+	const char *action;
  	int ret = 0, nr = 0;
  
  	if (switch_to_branch && !starts_with(switch_to_branch, "refs/"))

@@ -47,7 +96,9 @@ int reset_head(struct repository *r, struct object_id *oid,
  		oid = &head_oid;
  
  	if (refs_only)
-		goto reset_head_refs;
+		return update_refs(oid, switch_to_branch, reflog_head,
+				   reflog_orig_head, default_reflog_action,
+				   flags);
  
  	action = reset_hard ? "reset" : "checkout";
  	setup_unpack_trees_porcelain(&unpack_tree_opts, action);

@@ -90,49 +141,10 @@ int reset_head(struct repository *r, struct object_id *oid,
  		goto leave_reset_head;
  	}
  
-reset_head_refs:
-	reflog_action = getenv(GIT_REFLOG_ACTION_ENVIRONMENT);
-	strbuf_addf(&msg, "%s: ", reflog_action ? reflog_action : default_reflog_action);
-	prefix_len = msg.len;
-
-	if (update_orig_head) {
-		if (!get_oid("ORIG_HEAD", &oid_old_orig))
-			old_orig = &oid_old_orig;
-		if (!get_oid("HEAD", &oid_orig)) {
-			orig = &oid_orig;
-			if (!reflog_orig_head) {
-				strbuf_addstr(&msg, "updating ORIG_HEAD");
-				reflog_orig_head = msg.buf;
-			}
-			update_ref(reflog_orig_head, "ORIG_HEAD", orig,
-				   old_orig, 0, UPDATE_REFS_MSG_ON_ERR);
-		} else if (old_orig)
-			delete_ref(NULL, "ORIG_HEAD", old_orig, 0);
-	}
-
-	if (!reflog_head) {
-		strbuf_setlen(&msg, prefix_len);
-		strbuf_addstr(&msg, "updating HEAD");
-		reflog_head = msg.buf;
-	}
-	if (!switch_to_branch)
-		ret = update_ref(reflog_head, "HEAD", oid, orig,
-				 detach_head ? REF_NO_DEREF : 0,
-				 UPDATE_REFS_MSG_ON_ERR);
-	else {
-		ret = update_ref(reflog_head, switch_to_branch, oid,
-				 NULL, 0, UPDATE_REFS_MSG_ON_ERR);
-		if (!ret)
-			ret = create_symref("HEAD", switch_to_branch,
-					    reflog_head);
-	}
-	if (!ret && run_hook)
-		run_hook_le(NULL, "post-checkout",
-			    oid_to_hex(orig ? orig : null_oid()),
-			    oid_to_hex(oid), "1", NULL);
+	ret = update_refs(oid, switch_to_branch, reflog_head, reflog_orig_head,
+			  default_reflog_action, flags);
  
  leave_reset_head:
-	strbuf_release(&msg);
  	rollback_lock_file(&lock);
  	clear_unpack_trees_porcelain(&unpack_tree_opts);
  	while (nr)