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sequencer: rewrite update-refs as user edits todo list

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An interactive rebase provides opportunities for the user to edit the
todo list. The --update-refs option initializes the list with some
'update-ref <ref>' steps, but the user could add these manually.
Further, the user could add or remove these steps during pauses in the
interactive rebase.

Add a new method, todo_list_filter_update_refs(), that scans a todo_list
and compares it to the stored update-refs file. There are two actions
that can happen at this point:

1. If a '<ref>/<before>/<after>' triple in the update-refs file does not
   have a matching 'update-ref <ref>' command in the todo-list _and_ the
   <after> value is the null OID, then remove that triple. Here, the
   user removed the 'update-ref <ref>' command before it was executed,
   since if it was executed then the <after> value would store the
   commit at that position.

2. If a 'update-ref <ref>' command in the todo-list does not have a
   matching '<ref>/<before>/<after>' triple in the update-refs file,
   then insert a new one. Store the <before> value to be the current
   OID pointed at by <ref>. This is handled inside of the
   init_update_ref_record() helper method.

We can test that this works by rewriting the todo-list several times in
the course of a rebase. Check that each ref is locked or unlocked for
updates after each todo-list update. We can also verify that the ref
update fails if a concurrent process updates one of the refs after the
rebase process records the "locked" ref location.

To help these tests, add a new 'set_replace_editor' helper that will
replace the todo-list with an exact file.

Reported-by: Phillip Wood <phillip.wood123@gmail.com>
Signed-off-by: Derrick Stolee <derrickstolee@github.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Derrick Stolee
2022-07-19 18:33:41 +00:00
committed by Junio C Hamano
parent 89fc0b53fd
commit b3b1a21d1a
5 changed files with 268 additions and 0 deletions
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12
sequencer.h
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@ -133,6 +133,18 @@ void todo_list_release(struct todo_list *todo_list);
const char *todo_item_get_arg(struct todo_list *todo_list,
struct todo_item *item);
/*
* Parse the update-refs file for the current rebase, then remove the
* refs that do not appear in the todo_list (and have not had updated
* values stored) and add refs that are in the todo_list but not
* represented in the update-refs file.
*
* If there are changes to the update-refs list, then write the new state
* to disk.
*/
void todo_list_filter_update_refs(struct repository *r,
struct todo_list *todo_list);
/* Call this to setup defaults before parsing command line options */
void sequencer_init_config(struct replay_opts *opts);
int sequencer_pick_revisions(struct repository *repo,