This rewrites `git merge-resolve' from shell to C. As for `git
merge-one-file', this port is not completely straightforward and removes
calls to external processes to avoid reading and writing the index over
and over again.
- The call to `update-index -q --refresh' is replaced by a call to
refresh_index().
- The call to `read-tree' is replaced by a call to unpack_trees() (and
all the setup needed).
- The call to `write-tree' is replaced by a call to
write_index_as_tree().
- The call to `merge-index', needed to invoke `git merge-one-file', is
replaced by a call to the new merge_all_index() function.
The index is read in cmd_merge_resolve(), and is wrote back by
merge_strategies_resolve().
The parameters of merge_strategies_resolve() will be surprising at first
glance: why using a commit list for `bases' and `remote', where we could
use an oid array, and a pointer to an oid? Because, in a later commit,
try_merge_strategy() will be able to call merge_strategies_resolve()
directly, and it already uses a commit list for `bases' (`common') and
`remote' (`remoteheads'), and a string for `head_arg'. To reduce
frictions later, merge_strategies_resolve() takes the same types of
parameters.
Signed-off-by: Alban Gruin <alban.gruin@xxxxxxxxx>
---
Makefile | 2 +-
builtin.h | 1 +
builtin/merge-resolve.c | 74 ++++++++++++++++++++++++++++++++
git-merge-resolve.sh | 54 -----------------------
git.c | 1 +
merge-strategies.c | 95 +++++++++++++++++++++++++++++++++++++++++
merge-strategies.h | 5 +++
7 files changed, 177 insertions(+), 55 deletions(-)
create mode 100644 builtin/merge-resolve.c
delete mode 100755 git-merge-resolve.sh
diff --git a/Makefile b/Makefile
index e2e4389f76..8fccc38006 100644
--- a/Makefile
+++ b/Makefile
@@ -600,7 +600,6 @@ SCRIPT_SH += git-bisect.sh
SCRIPT_SH += git-difftool--helper.sh
SCRIPT_SH += git-filter-branch.sh
SCRIPT_SH += git-merge-octopus.sh
-SCRIPT_SH += git-merge-resolve.sh
SCRIPT_SH += git-mergetool.sh
SCRIPT_SH += git-quiltimport.sh
SCRIPT_SH += git-request-pull.sh
@@ -1102,6 +1101,7 @@ BUILTIN_OBJS += builtin/merge-index.o
BUILTIN_OBJS += builtin/merge-one-file.o
BUILTIN_OBJS += builtin/merge-ours.o
BUILTIN_OBJS += builtin/merge-recursive.o
+BUILTIN_OBJS += builtin/merge-resolve.o
BUILTIN_OBJS += builtin/merge-tree.o
BUILTIN_OBJS += builtin/merge.o
BUILTIN_OBJS += builtin/mktag.o
diff --git a/builtin.h b/builtin.h
index 227c133036..c3029cef46 100644
--- a/builtin.h
+++ b/builtin.h
@@ -181,6 +181,7 @@ int cmd_merge_ours(int argc, const char **argv, const char *prefix);
int cmd_merge_file(int argc, const char **argv, const char *prefix);
int cmd_merge_one_file(int argc, const char **argv, const char *prefix);
int cmd_merge_recursive(int argc, const char **argv, const char *prefix);
+int cmd_merge_resolve(int argc, const char **argv, const char *prefix);
int cmd_merge_tree(int argc, const char **argv, const char *prefix);
int cmd_mktag(int argc, const char **argv, const char *prefix);
int cmd_mktree(int argc, const char **argv, const char *prefix);
diff --git a/builtin/merge-resolve.c b/builtin/merge-resolve.c
new file mode 100644
index 0000000000..0f2e487c4d
--- /dev/null
+++ b/builtin/merge-resolve.c
@@ -0,0 +1,74 @@
+/*
+ * Builtin "git merge-resolve"
+ *
+ * Copyright (c) 2020 Alban Gruin
+ *
+ * Based on git-merge-resolve.sh, written by Linus Torvalds and Junio C
+ * Hamano.
+ *
+ * Resolve two trees, using enhanced multi-base read-tree.
+ */
+
+#include "cache.h"
+#include "builtin.h"
+#include "merge-strategies.h"
+
+static const char builtin_merge_resolve_usage[] =
+ "git merge-resolve <bases>... -- <head> <remote>";
+
+int cmd_merge_resolve(int argc, const char **argv, const char *prefix)
+{
+ int i, sep_seen = 0;
+ const char *head = NULL;
+ struct commit_list *bases = NULL, *remote = NULL;
+ struct commit_list **next_base = &bases;
+ struct repository *r = the_repository;
+
+ if (argc < 5)
+ usage(builtin_merge_resolve_usage);
+
+ setup_work_tree();
+ if (repo_read_index(r) < 0)
+ die("invalid index");
+
+ /*
+ * The first parameters up to -- are merge bases; the rest are
+ * heads.
+ */
+ for (i = 1; i < argc; i++) {
+ if (!strcmp(argv[i], "--"))
+ sep_seen = 1;
+ else if (!strcmp(argv[i], "-h"))
+ usage(builtin_merge_resolve_usage);
+ else if (sep_seen && !head)
+ head = argv[i];
+ else {
+ struct object_id oid;
+ struct commit *commit;
+
+ if (get_oid(argv[i], &oid))
+ die("object %s not found.", argv[i]);
+
+ commit = oideq(&oid, r->hash_algo->empty_tree) ?
+ NULL : lookup_commit_or_die(&oid, argv[i]);
+
+ if (sep_seen)
+ commit_list_insert(commit, &remote);
+ else
+ next_base = commit_list_append(commit, next_base);
+ }
+ }
+
+ /*
+ * Give up if we are given two or more remotes. Not handling
+ * octopus.
+ */
+ if (remote && remote->next)
+ return 2;
+
+ /* Give up if this is a baseless merge. */
+ if (!bases)
+ return 2;
+
+ return merge_strategies_resolve(r, bases, head, remote);
+}
diff --git a/git-merge-resolve.sh b/git-merge-resolve.sh
deleted file mode 100755
index 0b4fc88b61..0000000000
--- a/git-merge-resolve.sh
+++ /dev/null
@@ -1,54 +0,0 @@
-#!/bin/sh
-#
-# Copyright (c) 2005 Linus Torvalds
-# Copyright (c) 2005 Junio C Hamano
-#
-# Resolve two trees, using enhanced multi-base read-tree.
-
-# The first parameters up to -- are merge bases; the rest are heads.
-bases= head= remotes= sep_seen=
-for arg
-do
- case ",$sep_seen,$head,$arg," in
- *,--,)
- sep_seen=yes
- ;;
- ,yes,,*)
- head=$arg
- ;;
- ,yes,*)
- remotes="$remotes$arg "
- ;;
- *)
- bases="$bases$arg "
- ;;
- esac
-done
-
-# Give up if we are given two or more remotes -- not handling octopus.
-case "$remotes" in
-?*' '?*)
- exit 2 ;;
-esac
-
-# Give up if this is a baseless merge.
-if test '' = "$bases"
-then
- exit 2
-fi
-
-git update-index -q --refresh
-git read-tree -u -m --aggressive $bases $head $remotes || exit 2
-echo "Trying simple merge."
-if result_tree=$(git write-tree 2>/dev/null)
-then
- exit 0
-else
- echo "Simple merge failed, trying Automatic merge."
- if git merge-index -o --use=merge-one-file -a
- then
- exit 0
- else
- exit 1
- fi
-fi
diff --git a/git.c b/git.c
index 95eb74efe1..ce1f237369 100644
--- a/git.c
+++ b/git.c
@@ -548,6 +548,7 @@ static struct cmd_struct commands[] = {
{ "merge-recursive", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE | NO_PARSEOPT },
{ "merge-recursive-ours", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE | NO_PARSEOPT },
{ "merge-recursive-theirs", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE | NO_PARSEOPT },
+ { "merge-resolve", cmd_merge_resolve, RUN_SETUP | NEED_WORK_TREE | NO_PARSEOPT },
{ "merge-subtree", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE | NO_PARSEOPT },
{ "merge-tree", cmd_merge_tree, RUN_SETUP | NO_PARSEOPT },
{ "mktag", cmd_mktag, RUN_SETUP | NO_PARSEOPT },
diff --git a/merge-strategies.c b/merge-strategies.c
index 2717af51fd..a51700dae5 100644
--- a/merge-strategies.c
+++ b/merge-strategies.c
@@ -1,6 +1,9 @@
#include "cache.h"
+#include "cache-tree.h"
#include "dir.h"
+#include "lockfile.h"
#include "merge-strategies.h"
+#include "unpack-trees.h"
#include "xdiff-interface.h"
static int add_merge_result_to_index(struct index_state *istate, unsigned int mode,
@@ -272,3 +275,95 @@ int merge_all_index(struct index_state *istate, int oneshot, int quiet,
return err;
}
+
+static int fast_forward(struct repository *r, struct tree_desc *t,
+ int nr, int aggressive)
+{
+ struct unpack_trees_options opts;
+ struct lock_file lock = LOCK_INIT;
+
+ refresh_index(r->index, REFRESH_QUIET, NULL, NULL, NULL);
+ repo_hold_locked_index(r, &lock, LOCK_DIE_ON_ERROR);
+
+ memset(&opts, 0, sizeof(opts));
+ opts.head_idx = 1;
+ opts.src_index = r->index;
+ opts.dst_index = r->index;
+ opts.merge = 1;
+ opts.update = 1;
+ opts.aggressive = aggressive;
+
+ if (nr == 1)
+ opts.fn = oneway_merge;
+ else if (nr == 2) {
+ opts.fn = twoway_merge;
+ opts.initial_checkout = is_index_unborn(r->index);
+ } else if (nr >= 3) {
+ opts.fn = threeway_merge;
+ opts.head_idx = nr - 1;
+ }
+
+ if (unpack_trees(nr, t, &opts))
+ return -1;
+
+ if (write_locked_index(r->index, &lock, COMMIT_LOCK))
+ return error(_("unable to write new index file"));
+
+ return 0;
+}
+
+static int add_tree(struct tree *tree, struct tree_desc *t)
+{
+ if (parse_tree(tree))
+ return -1;
+
+ init_tree_desc(t, tree->buffer, tree->size);
+ return 0;
+}
+
+int merge_strategies_resolve(struct repository *r,
+ struct commit_list *bases, const char *head_arg,
+ struct commit_list *remote)
+{
+ struct tree_desc t[MAX_UNPACK_TREES];
+ struct object_id head, oid;
+ struct commit_list *i;
+ int nr = 0;
+
+ if (head_arg)
+ get_oid(head_arg, &head);
+
+ puts(_("Trying simple merge."));
+
+ for (i = bases; i && i->item; i = i->next) {
+ if (add_tree(repo_get_commit_tree(r, i->item), t + (nr++)))
+ return 2;
+ }
+
+ if (head_arg) {
+ struct tree *tree = parse_tree_indirect(&head);
+ if (add_tree(tree, t + (nr++)))
+ return 2;
+ }
+
+ if (remote && add_tree(repo_get_commit_tree(r, remote->item), t + (nr++)))
+ return 2;
+
+ if (fast_forward(r, t, nr, 1))
+ return 2;
+
+ if (write_index_as_tree(&oid, r->index, r->index_file,
+ WRITE_TREE_SILENT, NULL)) {
+ int ret;
+ struct lock_file lock = LOCK_INIT;
+
+ puts(_("Simple merge failed, trying Automatic merge."));
+ repo_hold_locked_index(r, &lock, LOCK_DIE_ON_ERROR);
+ ret = merge_all_index(r->index, 1, 0, merge_one_file_func, NULL);
+
+ write_locked_index(r->index, &lock, COMMIT_LOCK);
+ return !!ret;
+ }
+
+ return 0;
+}
diff --git a/merge-strategies.h b/merge-strategies.h
index 8705a550ca..bba4bf999c 100644
--- a/merge-strategies.h
+++ b/merge-strategies.h
@@ -1,6 +1,7 @@
#ifndef MERGE_STRATEGIES_H
#define MERGE_STRATEGIES_H
+#include "commit.h"
#include "object.h"
int merge_three_way(struct index_state *istate,
@@ -28,4 +29,8 @@ int merge_index_path(struct index_state *istate, int oneshot, int quiet,
int merge_all_index(struct index_state *istate, int oneshot, int quiet,
merge_fn fn, void *data);
+int merge_strategies_resolve(struct repository *r,
+ struct commit_list *bases, const char *head_arg,
+ struct commit_list *remote);
+
#endif /* MERGE_STRATEGIES_H */
--
2.31.0
