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sequencer: rewrite update-refs as user edits todo list
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>
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@ -146,6 +146,12 @@ int edit_todo_list(struct repository *r, struct todo_list *todo_list,
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return -4;
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}
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/*
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* See if branches need to be added or removed from the update-refs
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* file based on the new todo list.
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*/
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todo_list_filter_update_refs(r, new_todo);
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return 0;
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}
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96
sequencer.c
96
sequencer.c
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@ -4168,6 +4168,102 @@ static int write_update_refs_state(struct string_list *refs_to_oids)
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return result;
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}
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/*
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* Parse the update-refs file for the current rebase, then remove the
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* refs that do not appear in the todo_list (and have not had updated
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* values stored) and add refs that are in the todo_list but not
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* represented in the update-refs file.
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*
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* If there are changes to the update-refs list, then write the new state
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* to disk.
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*/
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void todo_list_filter_update_refs(struct repository *r,
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struct todo_list *todo_list)
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{
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int i;
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int updated = 0;
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struct string_list update_refs = STRING_LIST_INIT_DUP;
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sequencer_get_update_refs_state(r->gitdir, &update_refs);
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/*
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* For each item in the update_refs list, if it has no updated
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* value and does not appear in the todo_list, then remove it
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* from the update_refs list.
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*/
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for (i = 0; i < update_refs.nr; i++) {
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int j;
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int found = 0;
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const char *ref = update_refs.items[i].string;
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size_t reflen = strlen(ref);
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struct update_ref_record *rec = update_refs.items[i].util;
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/* OID already stored as updated. */
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if (!is_null_oid(&rec->after))
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continue;
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for (j = 0; !found && j < todo_list->total_nr; j++) {
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struct todo_item *item = &todo_list->items[j];
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const char *arg = todo_list->buf.buf + item->arg_offset;
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if (item->command != TODO_UPDATE_REF)
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continue;
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if (item->arg_len != reflen ||
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strncmp(arg, ref, reflen))
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continue;
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found = 1;
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}
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if (!found) {
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free(update_refs.items[i].string);
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free(update_refs.items[i].util);
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update_refs.nr--;
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MOVE_ARRAY(update_refs.items + i, update_refs.items + i + 1, update_refs.nr - i);
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updated = 1;
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i--;
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}
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}
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/*
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* For each todo_item, check if its ref is in the update_refs list.
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* If not, then add it as an un-updated ref.
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*/
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for (i = 0; i < todo_list->total_nr; i++) {
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struct todo_item *item = &todo_list->items[i];
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const char *arg = todo_list->buf.buf + item->arg_offset;
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int j, found = 0;
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if (item->command != TODO_UPDATE_REF)
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continue;
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for (j = 0; !found && j < update_refs.nr; j++) {
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const char *ref = update_refs.items[j].string;
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found = strlen(ref) == item->arg_len &&
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!strncmp(ref, arg, item->arg_len);
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}
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if (!found) {
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struct string_list_item *inserted;
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struct strbuf argref = STRBUF_INIT;
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strbuf_add(&argref, arg, item->arg_len);
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inserted = string_list_insert(&update_refs, argref.buf);
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inserted->util = init_update_ref_record(argref.buf);
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strbuf_release(&argref);
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updated = 1;
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}
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}
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if (updated)
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write_update_refs_state(&update_refs);
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string_list_clear(&update_refs, 1);
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}
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static int do_update_ref(struct repository *r, const char *refname)
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{
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struct string_list_item *item;
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12
sequencer.h
12
sequencer.h
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@ -133,6 +133,18 @@ void todo_list_release(struct todo_list *todo_list);
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const char *todo_item_get_arg(struct todo_list *todo_list,
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struct todo_item *item);
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/*
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* Parse the update-refs file for the current rebase, then remove the
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* refs that do not appear in the todo_list (and have not had updated
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* values stored) and add refs that are in the todo_list but not
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* represented in the update-refs file.
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*
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* If there are changes to the update-refs list, then write the new state
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* to disk.
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*/
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void todo_list_filter_update_refs(struct repository *r,
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struct todo_list *todo_list);
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/* Call this to setup defaults before parsing command line options */
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void sequencer_init_config(struct replay_opts *opts);
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int sequencer_pick_revisions(struct repository *repo,
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@ -207,3 +207,18 @@ check_reworded_commits () {
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>reword-log &&
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test_cmp reword-expected reword-log
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}
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# usage: set_replace_editor <file>
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#
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# Replace the todo file with the exact contents of the given file.
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set_replace_editor () {
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cat >script <<-\EOF &&
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cat FILENAME >"$1"
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echo 'rebase -i script after editing:'
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cat "$1"
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EOF
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sed -e "s/FILENAME/$1/g" <script | write_script fake-editor.sh &&
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test_set_editor "$(pwd)/fake-editor.sh"
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}
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@ -1834,6 +1834,145 @@ test_expect_success '--update-refs updates refs correctly' '
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test_cmp_rev HEAD refs/heads/no-conflict-branch
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'
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test_expect_success 'respect user edits to update-ref steps' '
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git checkout -B update-refs-break no-conflict-branch &&
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git branch -f base HEAD~4 &&
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git branch -f first HEAD~3 &&
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git branch -f second HEAD~3 &&
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git branch -f third HEAD~1 &&
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git branch -f unseen base &&
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# First, we will add breaks to the expected todo file
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cat >fake-todo-1 <<-EOF &&
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pick $(git rev-parse HEAD~3)
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break
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update-ref refs/heads/second
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update-ref refs/heads/first
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pick $(git rev-parse HEAD~2)
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pick $(git rev-parse HEAD~1)
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update-ref refs/heads/third
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pick $(git rev-parse HEAD)
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update-ref refs/heads/no-conflict-branch
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EOF
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# Second, we will drop some update-refs commands (and move one)
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cat >fake-todo-2 <<-EOF &&
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update-ref refs/heads/second
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pick $(git rev-parse HEAD~2)
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update-ref refs/heads/third
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pick $(git rev-parse HEAD~1)
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break
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pick $(git rev-parse HEAD)
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EOF
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# Third, we will:
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# * insert a new one (new-branch),
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# * re-add an old one (first), and
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# * add a second instance of a previously-stored one (second)
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cat >fake-todo-3 <<-EOF &&
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update-ref refs/heads/unseen
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update-ref refs/heads/new-branch
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pick $(git rev-parse HEAD)
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update-ref refs/heads/first
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update-ref refs/heads/second
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EOF
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(
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set_replace_editor fake-todo-1 &&
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git rebase -i --update-refs primary &&
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# These branches are currently locked.
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for b in first second third no-conflict-branch
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do
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test_must_fail git branch -f $b base || return 1
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done &&
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set_replace_editor fake-todo-2 &&
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git rebase --edit-todo &&
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# These branches are currently locked.
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for b in second third
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do
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test_must_fail git branch -f $b base || return 1
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done &&
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# These branches are currently unlocked for checkout.
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for b in first no-conflict-branch
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do
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git worktree add wt-$b $b &&
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git worktree remove wt-$b || return 1
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done &&
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git rebase --continue &&
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set_replace_editor fake-todo-3 &&
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git rebase --edit-todo &&
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# These branches are currently locked.
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for b in second third first unseen
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do
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test_must_fail git branch -f $b base || return 1
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done &&
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# These branches are currently unlocked for checkout.
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for b in no-conflict-branch
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do
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git worktree add wt-$b $b &&
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git worktree remove wt-$b || return 1
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done &&
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git rebase --continue
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) &&
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test_cmp_rev HEAD~2 refs/heads/third &&
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test_cmp_rev HEAD~1 refs/heads/unseen &&
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test_cmp_rev HEAD~1 refs/heads/new-branch &&
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test_cmp_rev HEAD refs/heads/first &&
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test_cmp_rev HEAD refs/heads/second &&
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test_cmp_rev HEAD refs/heads/no-conflict-branch
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'
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test_expect_success '--update-refs: check failed ref update' '
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git checkout -B update-refs-error no-conflict-branch &&
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git branch -f base HEAD~4 &&
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git branch -f first HEAD~3 &&
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git branch -f second HEAD~2 &&
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git branch -f third HEAD~1 &&
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cat >fake-todo <<-EOF &&
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pick $(git rev-parse HEAD~3)
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break
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update-ref refs/heads/first
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pick $(git rev-parse HEAD~2)
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update-ref refs/heads/second
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pick $(git rev-parse HEAD~1)
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update-ref refs/heads/third
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pick $(git rev-parse HEAD)
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update-ref refs/heads/no-conflict-branch
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EOF
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(
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set_replace_editor fake-todo &&
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git rebase -i --update-refs base
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) &&
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# At this point, the values of first, second, and third are
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# recorded in the update-refs file. We will force-update the
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# "second" ref, but "git branch -f" will not work because of
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# the lock in the update-refs file.
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git rev-parse third >.git/refs/heads/second &&
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git rebase --continue 2>err &&
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grep "update_ref failed for ref '\''refs/heads/second'\''" err
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'
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# This must be the last test in this file
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test_expect_success '$EDITOR and friends are unchanged' '
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test_editor_unchanged
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