From 894642f68d3160db9116ca350da83c4a78cff8f2 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Nguy=E1=BB=85n=20Th=C3=A1i=20Ng=E1=BB=8Dc=20Duy?= Date: Sat, 17 Sep 2011 21:57:44 +1000 Subject: [PATCH] merge: remove global variable head[] MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Also kill head_invalid in favor of "head_commit == NULL". Local variable "head" in cmd_merge() is renamed to "head_sha1" to make sure I don't miss any access because this variable should not be used after head_commit is set (use head_commit->object.sha1 instead). Signed-off-by: Nguyễn Thái Ngọc Duy Signed-off-by: Junio C Hamano --- builtin/merge.c | 97 +++++++++++++++++++++++++++---------------------- 1 file changed, 53 insertions(+), 44 deletions(-) diff --git a/builtin/merge.c b/builtin/merge.c index c371484ab6..f5eb3f549b 100644 --- a/builtin/merge.c +++ b/builtin/merge.c @@ -50,7 +50,6 @@ static int fast_forward_only; static int allow_trivial = 1, have_message; static struct strbuf merge_msg; static struct commit_list *remoteheads; -static unsigned char head[20]; static struct strategy **use_strategies; static size_t use_strategies_nr, use_strategies_alloc; static const char **xopts; @@ -279,7 +278,8 @@ static void reset_hard(unsigned const char *sha1, int verbose) die(_("read-tree failed")); } -static void restore_state(const unsigned char *stash) +static void restore_state(const unsigned char *head, + const unsigned char *stash) { struct strbuf sb = STRBUF_INIT; const char *args[] = { "stash", "apply", NULL, NULL }; @@ -309,10 +309,9 @@ static void finish_up_to_date(const char *msg) drop_save(); } -static void squash_message(void) +static void squash_message(struct commit *commit) { struct rev_info rev; - struct commit *commit; struct strbuf out = STRBUF_INIT; struct commit_list *j; int fd; @@ -327,7 +326,6 @@ static void squash_message(void) rev.ignore_merges = 1; rev.commit_format = CMIT_FMT_MEDIUM; - commit = lookup_commit(head); commit->object.flags |= UNINTERESTING; add_pending_object(&rev, &commit->object, NULL); @@ -356,9 +354,11 @@ static void squash_message(void) strbuf_release(&out); } -static void finish(const unsigned char *new_head, const char *msg) +static void finish(struct commit *head_commit, + const unsigned char *new_head, const char *msg) { struct strbuf reflog_message = STRBUF_INIT; + const unsigned char *head = head_commit->object.sha1; if (!msg) strbuf_addstr(&reflog_message, getenv("GIT_REFLOG_ACTION")); @@ -369,7 +369,7 @@ static void finish(const unsigned char *new_head, const char *msg) getenv("GIT_REFLOG_ACTION"), msg); } if (squash) { - squash_message(); + squash_message(head_commit); } else { if (verbosity >= 0 && !merge_msg.len) printf(_("No merge message -- not updating HEAD\n")); @@ -664,7 +664,7 @@ int try_merge_command(const char *strategy, size_t xopts_nr, } static int try_merge_strategy(const char *strategy, struct commit_list *common, - const char *head_arg) + struct commit *head, const char *head_arg) { int index_fd; struct lock_file *lock = xcalloc(1, sizeof(struct lock_file)); @@ -710,7 +710,7 @@ static int try_merge_strategy(const char *strategy, struct commit_list *common, commit_list_insert(j->item, &reversed); index_fd = hold_locked_index(lock, 1); - clean = merge_recursive(&o, lookup_commit(head), + clean = merge_recursive(&o, head, remoteheads->item, reversed, &result); if (active_cache_changed && (write_cache(index_fd, active_cache, active_nr) || @@ -861,25 +861,26 @@ static void run_prepare_commit_msg(void) read_merge_msg(); } -static int merge_trivial(void) +static int merge_trivial(struct commit *head) { unsigned char result_tree[20], result_commit[20]; struct commit_list *parent = xmalloc(sizeof(*parent)); write_tree_trivial(result_tree); printf(_("Wonderful.\n")); - parent->item = lookup_commit(head); + parent->item = head; parent->next = xmalloc(sizeof(*parent->next)); parent->next->item = remoteheads->item; parent->next->next = NULL; run_prepare_commit_msg(); commit_tree(merge_msg.buf, result_tree, parent, result_commit, NULL); - finish(result_commit, "In-index merge"); + finish(head, result_commit, "In-index merge"); drop_save(); return 0; } -static int finish_automerge(struct commit_list *common, +static int finish_automerge(struct commit *head, + struct commit_list *common, unsigned char *result_tree, const char *wt_strategy) { @@ -890,12 +891,12 @@ static int finish_automerge(struct commit_list *common, free_commit_list(common); if (allow_fast_forward) { parents = remoteheads; - commit_list_insert(lookup_commit(head), &parents); + commit_list_insert(head, &parents); parents = reduce_heads(parents); } else { struct commit_list **pptr = &parents; - pptr = &commit_list_insert(lookup_commit(head), + pptr = &commit_list_insert(head, pptr)->next; for (j = remoteheads; j; j = j->next) pptr = &commit_list_insert(j->item, pptr)->next; @@ -905,7 +906,7 @@ static int finish_automerge(struct commit_list *common, run_prepare_commit_msg(); commit_tree(merge_msg.buf, result_tree, parents, result_commit, NULL); strbuf_addf(&buf, "Merge made by %s.", wt_strategy); - finish(result_commit, buf.buf); + finish(head, result_commit, buf.buf); strbuf_release(&buf); drop_save(); return 0; @@ -939,7 +940,8 @@ static int suggest_conflicts(int renormalizing) return 1; } -static struct commit *is_old_style_invocation(int argc, const char **argv) +static struct commit *is_old_style_invocation(int argc, const char **argv, + const unsigned char *head) { struct commit *second_token = NULL; if (argc > 2) { @@ -1012,9 +1014,11 @@ int cmd_merge(int argc, const char **argv, const char *prefix) { unsigned char result_tree[20]; unsigned char stash[20]; + unsigned char head_sha1[20]; + struct commit *head_commit; struct strbuf buf = STRBUF_INIT; const char *head_arg; - int flag, head_invalid = 0, i; + int flag, i; int best_cnt = -1, merge_was_ok = 0, automerge_was_ok = 0; struct commit_list *common = NULL; const char *best_strategy = NULL, *wt_strategy = NULL; @@ -1027,11 +1031,16 @@ int cmd_merge(int argc, const char **argv, const char *prefix) * Check if we are _not_ on a detached HEAD, i.e. if there is a * current branch. */ - branch = resolve_ref("HEAD", head, 0, &flag); + branch = resolve_ref("HEAD", head_sha1, 0, &flag); if (branch && !prefixcmp(branch, "refs/heads/")) branch += 11; - if (!branch || is_null_sha1(head)) - head_invalid = 1; + if (!branch || is_null_sha1(head_sha1)) + head_commit = NULL; + else { + head_commit = lookup_commit(head_sha1); + if (!head_commit) + die(_("could not parse HEAD")); + } git_config(git_merge_config, NULL); @@ -1112,12 +1121,13 @@ int cmd_merge(int argc, const char **argv, const char *prefix) * additional safety measure to check for it. */ - if (!have_message && is_old_style_invocation(argc, argv)) { + if (!have_message && head_commit && + is_old_style_invocation(argc, argv, head_commit->object.sha1)) { strbuf_addstr(&merge_msg, argv[0]); head_arg = argv[1]; argv += 2; argc -= 2; - } else if (head_invalid) { + } else if (!head_commit) { struct object *remote_head; /* * If the merged head is a valid one there is no reason @@ -1164,7 +1174,7 @@ int cmd_merge(int argc, const char **argv, const char *prefix) } } - if (head_invalid || !argc) + if (!head_commit || !argc) usage_with_options(builtin_merge_usage, builtin_merge_options); @@ -1205,17 +1215,16 @@ int cmd_merge(int argc, const char **argv, const char *prefix) } if (!remoteheads->next) - common = get_merge_bases(lookup_commit(head), - remoteheads->item, 1); + common = get_merge_bases(head_commit, remoteheads->item, 1); else { struct commit_list *list = remoteheads; - commit_list_insert(lookup_commit(head), &list); + commit_list_insert(head_commit, &list); common = get_octopus_merge_bases(list); free(list); } - update_ref("updating ORIG_HEAD", "ORIG_HEAD", head, NULL, 0, - DIE_ON_ERR); + update_ref("updating ORIG_HEAD", "ORIG_HEAD", head_commit->object.sha1, + NULL, 0, DIE_ON_ERR); if (!common) ; /* No common ancestors found. We need a real merge. */ @@ -1229,13 +1238,13 @@ int cmd_merge(int argc, const char **argv, const char *prefix) return 0; } else if (allow_fast_forward && !remoteheads->next && !common->next && - !hashcmp(common->item->object.sha1, head)) { + !hashcmp(common->item->object.sha1, head_commit->object.sha1)) { /* Again the most common case of merging one remote. */ struct strbuf msg = STRBUF_INIT; struct object *o; char hex[41]; - strcpy(hex, find_unique_abbrev(head, DEFAULT_ABBREV)); + strcpy(hex, find_unique_abbrev(head_commit->object.sha1, DEFAULT_ABBREV)); if (verbosity >= 0) printf(_("Updating %s..%s\n"), @@ -1251,10 +1260,10 @@ int cmd_merge(int argc, const char **argv, const char *prefix) if (!o) return 1; - if (checkout_fast_forward(head, remoteheads->item->object.sha1)) + if (checkout_fast_forward(head_commit->object.sha1, remoteheads->item->object.sha1)) return 1; - finish(o->sha1, msg.buf); + finish(head_commit, o->sha1, msg.buf); drop_save(); return 0; } else if (!remoteheads->next && common->next) @@ -1274,8 +1283,8 @@ int cmd_merge(int argc, const char **argv, const char *prefix) git_committer_info(IDENT_ERROR_ON_NO_NAME); printf(_("Trying really trivial in-index merge...\n")); if (!read_tree_trivial(common->item->object.sha1, - head, remoteheads->item->object.sha1)) - return merge_trivial(); + head_commit->object.sha1, remoteheads->item->object.sha1)) + return merge_trivial(head_commit); printf(_("Nope.\n")); } } else { @@ -1294,8 +1303,7 @@ int cmd_merge(int argc, const char **argv, const char *prefix) * merge_bases again, otherwise "git merge HEAD^ * HEAD^^" would be missed. */ - common_one = get_merge_bases(lookup_commit(head), - j->item, 1); + common_one = get_merge_bases(head_commit, j->item, 1); if (hashcmp(common_one->item->object.sha1, j->item->object.sha1)) { up_to_date = 0; @@ -1333,7 +1341,7 @@ int cmd_merge(int argc, const char **argv, const char *prefix) int ret; if (i) { printf(_("Rewinding the tree to pristine...\n")); - restore_state(stash); + restore_state(head_commit->object.sha1, stash); } if (use_strategies_nr != 1) printf(_("Trying merge strategy %s...\n"), @@ -1345,7 +1353,7 @@ int cmd_merge(int argc, const char **argv, const char *prefix) wt_strategy = use_strategies[i]->name; ret = try_merge_strategy(use_strategies[i]->name, - common, head_arg); + common, head_commit, head_arg); if (!option_commit && !ret) { merge_was_ok = 1; /* @@ -1387,14 +1395,15 @@ int cmd_merge(int argc, const char **argv, const char *prefix) * auto resolved the merge cleanly. */ if (automerge_was_ok) - return finish_automerge(common, result_tree, wt_strategy); + return finish_automerge(head_commit, common, result_tree, + wt_strategy); /* * Pick the result from the best strategy and have the user fix * it up. */ if (!best_strategy) { - restore_state(stash); + restore_state(head_commit->object.sha1, stash); if (use_strategies_nr > 1) fprintf(stderr, _("No merge strategy handled the merge.\n")); @@ -1406,14 +1415,14 @@ int cmd_merge(int argc, const char **argv, const char *prefix) ; /* We already have its result in the working tree. */ else { printf(_("Rewinding the tree to pristine...\n")); - restore_state(stash); + restore_state(head_commit->object.sha1, stash); printf(_("Using the %s to prepare resolving by hand.\n"), best_strategy); - try_merge_strategy(best_strategy, common, head_arg); + try_merge_strategy(best_strategy, common, head_commit, head_arg); } if (squash) - finish(NULL, NULL); + finish(head_commit, NULL, NULL); else { int fd; struct commit_list *j;