1 files changed, 73 insertions, 47 deletions

diff --git a/builtin/checkout.c b/builtin/checkout.c
index 8600860..2b33960 100644
--- a/builtin/checkout.c
+++ b/builtin/checkout.c
@@ -9,6 +9,7 @@
 #include "config.h"
 #include "diff.h"
 #include "dir.h"
+#include "hook.h"
 #include "ll-merge.h"
 #include "lockfile.h"
 #include "merge-recursive.h"
@@ -91,8 +92,8 @@ struct checkout_opts {
 };
 
 struct branch_info {
-	const char *name; /* The short name used */
-	const char *path; /* The full name of a real branch */
+	char *name; /* The short name used */
+	char *path; /* The full name of a real branch */
 	struct commit *commit; /* The named commit */
 	char *refname; /* The full name of the ref being checked out. */
 	struct object_id oid; /* The object ID of the commit being checked out. */
@@ -103,10 +104,18 @@ struct branch_info {
 	char *checkout;
 };
 
+static void branch_info_release(struct branch_info *info)
+{
+	free(info->name);
+	free(info->path);
+	free(info->refname);
+	free(info->checkout);
+}
+
 static int post_checkout_hook(struct commit *old_commit, struct commit *new_commit,
 			      int changed)
 {
-	return run_hook_le(NULL, "post-checkout",
+	return run_hooks_l("post-checkout",
 			   oid_to_hex(old_commit ? &old_commit->object.oid : null_oid()),
 			   oid_to_hex(new_commit ? &new_commit->object.oid : null_oid()),
 			   changed ? "1" : "0", NULL);
@@ -237,6 +246,7 @@ static int checkout_merged(int pos, const struct checkout *state,
 	struct cache_entry *ce = active_cache[pos];
 	const char *path = ce->name;
 	mmfile_t ancestor, ours, theirs;
+	enum ll_merge_result merge_status;
 	int status;
 	struct object_id oid;
 	mmbuffer_t result_buf;
@@ -267,13 +277,16 @@ static int checkout_merged(int pos, const struct checkout *state,
 	memset(&ll_opts, 0, sizeof(ll_opts));
 	git_config_get_bool("merge.renormalize", &renormalize);
 	ll_opts.renormalize = renormalize;
-	status = ll_merge(&result_buf, path, &ancestor, "base",
-			  &ours, "ours", &theirs, "theirs",
-			  state->istate, &ll_opts);
+	merge_status = ll_merge(&result_buf, path, &ancestor, "base",
+				&ours, "ours", &theirs, "theirs",
+				state->istate, &ll_opts);
 	free(ancestor.ptr);
 	free(ours.ptr);
 	free(theirs.ptr);
-	if (status < 0 || !result_buf.ptr) {
+	if (merge_status == LL_MERGE_BINARY_CONFLICT)
+		warning("Cannot merge binary files: %s (%s vs. %s)",
+			path, "ours", "theirs");
+	if (merge_status < 0 || !result_buf.ptr) {
 		free(result_buf.ptr);
 		return error(_("path '%s': cannot merge"), path);
 	}
@@ -456,10 +469,10 @@ static int checkout_paths(const struct checkout_opts *opts,
 		die(_("'%s' cannot be used with updating paths"), "--detach");
 
 	if (opts->merge && opts->patch_mode)
-		die(_("'%s' cannot be used with %s"), "--merge", "--patch");
+		die(_("options '%s' and '%s' cannot be used together"), "--merge", "--patch");
 
 	if (opts->ignore_unmerged && opts->merge)
-		die(_("'%s' cannot be used with %s"),
+		die(_("options '%s' and '%s' cannot be used together"),
 		    opts->ignore_unmerged_opt, "-m");
 
 	if (opts->new_branch)
@@ -688,9 +701,12 @@ static void setup_branch_path(struct branch_info *branch)
 		repo_get_oid_committish(the_repository, branch->name, &branch->oid);
 
 	strbuf_branchname(&buf, branch->name, INTERPRET_BRANCH_LOCAL);
-	if (strcmp(buf.buf, branch->name))
+	if (strcmp(buf.buf, branch->name)) {
+		free(branch->name);
 		branch->name = xstrdup(buf.buf);
+	}
 	strbuf_splice(&buf, 0, 0, "refs/heads/", 11);
+	free(branch->path);
 	branch->path = strbuf_detach(&buf, NULL);
 }
 
@@ -874,7 +890,7 @@ static void update_refs_for_switch(const struct checkout_opts *opts,
 				int ret;
 				struct strbuf err = STRBUF_INIT;
 
-				ret = safe_create_reflog(refname, 1, &err);
+				ret = safe_create_reflog(refname, &err);
 				if (ret) {
 					fprintf(stderr, _("Can not do reflog for '%s': %s\n"),
 						opts->new_orphan_branch, err.buf);
@@ -895,7 +911,9 @@ static void update_refs_for_switch(const struct checkout_opts *opts,
 				      opts->quiet,
 				      opts->track,
 				      0);
-		new_branch_info->name = opts->new_branch;
+		free(new_branch_info->name);
+		free(new_branch_info->refname);
+		new_branch_info->name = xstrdup(opts->new_branch);
 		setup_branch_path(new_branch_info);
 	}
 
@@ -1063,8 +1081,7 @@ static int switch_branches(const struct checkout_opts *opts,
 			   struct branch_info *new_branch_info)
 {
 	int ret = 0;
-	struct branch_info old_branch_info;
-	void *path_to_free;
+	struct branch_info old_branch_info = { 0 };
 	struct object_id rev;
 	int flag, writeout_error = 0;
 	int do_merge = 1;
@@ -1072,25 +1089,29 @@ static int switch_branches(const struct checkout_opts *opts,
 	trace2_cmd_mode("branch");
 
 	memset(&old_branch_info, 0, sizeof(old_branch_info));
-	old_branch_info.path = path_to_free = resolve_refdup("HEAD", 0, &rev, &flag);
+	old_branch_info.path = resolve_refdup("HEAD", 0, &rev, &flag);
 	if (old_branch_info.path)
 		old_branch_info.commit = lookup_commit_reference_gently(the_repository, &rev, 1);
 	if (!(flag & REF_ISSYMREF))
-		old_branch_info.path = NULL;
+		FREE_AND_NULL(old_branch_info.path);
 
-	if (old_branch_info.path)
-		skip_prefix(old_branch_info.path, "refs/heads/", &old_branch_info.name);
+	if (old_branch_info.path) {
+		const char *const prefix = "refs/heads/";
+		const char *p;
+		if (skip_prefix(old_branch_info.path, prefix, &p))
+			old_branch_info.name = xstrdup(p);
+	}
 
 	if (opts->new_orphan_branch && opts->orphan_from_empty_tree) {
 		if (new_branch_info->name)
 			BUG("'switch --orphan' should never accept a commit as starting point");
 		new_branch_info->commit = NULL;
-		new_branch_info->name = "(empty)";
+		new_branch_info->name = xstrdup("(empty)");
 		do_merge = 1;
 	}
 
 	if (!new_branch_info->name) {
-		new_branch_info->name = "HEAD";
+		new_branch_info->name = xstrdup("HEAD");
 		new_branch_info->commit = old_branch_info.commit;
 		if (!new_branch_info->commit)
 			die(_("You are on a branch yet to be born"));
@@ -1103,7 +1124,7 @@ static int switch_branches(const struct checkout_opts *opts,
 	if (do_merge) {
 		ret = merge_working_tree(opts, &old_branch_info, new_branch_info, &writeout_error);
 		if (ret) {
-			free(path_to_free);
+			branch_info_release(&old_branch_info);
 			return ret;
 		}
 	}
@@ -1114,7 +1135,8 @@ static int switch_branches(const struct checkout_opts *opts,
 	update_refs_for_switch(opts, &old_branch_info, new_branch_info);
 
 	ret = post_checkout_hook(old_branch_info.commit, new_branch_info->commit, 1);
-	free(path_to_free);
+	branch_info_release(&old_branch_info);
+
 	return ret || writeout_error;
 }
 
@@ -1146,16 +1168,15 @@ static void setup_new_branch_info_and_source_tree(
 	struct tree **source_tree = &opts->source_tree;
 	struct object_id branch_rev;
 
-	new_branch_info->name = arg;
+	new_branch_info->name = xstrdup(arg);
 	setup_branch_path(new_branch_info);
 
 	if (!check_refname_format(new_branch_info->path, 0) &&
 	    !read_ref(new_branch_info->path, &branch_rev))
 		oidcpy(rev, &branch_rev);
-	else {
-		free((char *)new_branch_info->path);
-		new_branch_info->path = NULL; /* not an existing branch */
-	}
+	else
+		/* not an existing branch */
+		FREE_AND_NULL(new_branch_info->path);
 
 	new_branch_info->commit = lookup_commit_reference_gently(the_repository, rev, 1);
 	if (!new_branch_info->commit) {
@@ -1518,7 +1539,7 @@ static struct option *add_common_options(struct checkout_opts *opts,
 		OPT_BOOL(0, "progress", &opts->show_progress, N_("force progress reporting")),
 		OPT_BOOL('m', "merge", &opts->merge, N_("perform a 3-way merge with the new branch")),
 		OPT_STRING(0, "conflict", &opts->conflict_style, N_("style"),
-			   N_("conflict style (merge or diff3)")),
+			   N_("conflict style (merge, diff3, or zdiff3)")),
 		OPT_END()
 	};
 	struct option *newopts = parse_options_concat(prevopts, options);
@@ -1577,12 +1598,11 @@ static char cb_option = 'b';
 
 static int checkout_main(int argc, const char **argv, const char *prefix,
 			 struct checkout_opts *opts, struct option *options,
-			 const char * const usagestr[])
+			 const char * const usagestr[],
+			 struct branch_info *new_branch_info)
 {
-	struct branch_info new_branch_info;
 	int parseopt_flags = 0;
 
-	memset(&new_branch_info, 0, sizeof(new_branch_info));
 	opts->overwrite_ignore = 1;
 	opts->prefix = prefix;
 	opts->show_progress = -1;
@@ -1620,11 +1640,11 @@ static int checkout_main(int argc, const char **argv, const char *prefix,
 	}
 
 	if ((!!opts->new_branch + !!opts->new_branch_force + !!opts->new_orphan_branch) > 1)
-		die(_("-%c, -%c and --orphan are mutually exclusive"),
-				cb_option, toupper(cb_option));
+		die(_("options '-%c', '-%c', and '%s' cannot be used together"),
+			cb_option, toupper(cb_option), "--orphan");
 
 	if (opts->overlay_mode == 1 && opts->patch_mode)
-		die(_("-p and --overlay are mutually exclusive"));
+		die(_("options '%s' and '%s' cannot be used together"), "-p", "--overlay");
 
 	if (opts->checkout_index >= 0 || opts->checkout_worktree >= 0) {
 		if (opts->checkout_index < 0)
@@ -1691,7 +1711,7 @@ static int checkout_main(int argc, const char **argv, const char *prefix,
 			opts->track == BRANCH_TRACK_UNSPECIFIED &&
 			!opts->new_branch;
 		int n = parse_branchname_arg(argc, argv, dwim_ok,
-					     &new_branch_info, opts, &rev);
+					     new_branch_info, opts, &rev);
 		argv += n;
 		argc -= n;
 	} else if (!opts->accept_ref && opts->from_treeish) {
@@ -1700,7 +1720,7 @@ static int checkout_main(int argc, const char **argv, const char *prefix,
 		if (get_oid_mb(opts->from_treeish, &rev))
 			die(_("could not resolve %s"), opts->from_treeish);
 
-		setup_new_branch_info_and_source_tree(&new_branch_info,
+		setup_new_branch_info_and_source_tree(new_branch_info,
 						      opts, &rev,
 						      opts->from_treeish);
 
@@ -1720,7 +1740,7 @@ static int checkout_main(int argc, const char **argv, const char *prefix,
 		 * Try to give more helpful suggestion.
 		 * new_branch && argc > 1 will be caught later.
 		 */
-		if (opts->new_branch && argc == 1 && !new_branch_info.commit)
+		if (opts->new_branch && argc == 1 && !new_branch_info->commit)
 			die(_("'%s' is not a commit and a branch '%s' cannot be created from it"),
 				argv[0], opts->new_branch);
 
@@ -1731,19 +1751,19 @@ static int checkout_main(int argc, const char **argv, const char *prefix,
 
 	if (opts->pathspec_from_file) {
 		if (opts->pathspec.nr)
-			die(_("--pathspec-from-file is incompatible with pathspec arguments"));
+			die(_("'%s' and pathspec arguments cannot be used together"), "--pathspec-from-file");
 
 		if (opts->force_detach)
-			die(_("--pathspec-from-file is incompatible with --detach"));
+			die(_("options '%s' and '%s' cannot be used together"), "--pathspec-from-file", "--detach");
 
 		if (opts->patch_mode)
-			die(_("--pathspec-from-file is incompatible with --patch"));
+			die(_("options '%s' and '%s' cannot be used together"), "--pathspec-from-file", "--patch");
 
 		parse_pathspec_file(&opts->pathspec, 0,
 				    0,
 				    prefix, opts->pathspec_from_file, opts->pathspec_file_nul);
 	} else if (opts->pathspec_file_nul) {
-		die(_("--pathspec-file-nul requires --pathspec-from-file"));
+		die(_("the option '%s' requires '%s'"), "--pathspec-file-nul", "--pathspec-from-file");
 	}
 
 	opts->pathspec.recursive = 1;
@@ -1769,11 +1789,10 @@ static int checkout_main(int argc, const char **argv, const char *prefix,
 		strbuf_release(&buf);
 	}
 
-	UNLEAK(opts);
 	if (opts->patch_mode || opts->pathspec.nr)
-		return checkout_paths(opts, &new_branch_info);
+		return checkout_paths(opts, new_branch_info);
 	else
-		return checkout_branch(opts, &new_branch_info);
+		return checkout_branch(opts, new_branch_info);
 }
 
 int cmd_checkout(int argc, const char **argv, const char *prefix)
@@ -1792,6 +1811,7 @@ int cmd_checkout(int argc, const char **argv, const char *prefix)
 		OPT_END()
 	};
 	int ret;
+	struct branch_info new_branch_info = { 0 };
 
 	memset(&opts, 0, sizeof(opts));
 	opts.dwim_new_local_branch = 1;
@@ -1822,7 +1842,9 @@ int cmd_checkout(int argc, const char **argv, const char *prefix)
 	options = add_checkout_path_options(&opts, options);
 
 	ret = checkout_main(argc, argv, prefix, &opts,
-			    options, checkout_usage);
+			    options, checkout_usage, &new_branch_info);
+	branch_info_release(&new_branch_info);
+	clear_pathspec(&opts.pathspec);
 	FREE_AND_NULL(options);
 	return ret;
 }
@@ -1843,6 +1865,7 @@ int cmd_switch(int argc, const char **argv, const char *prefix)
 		OPT_END()
 	};
 	int ret;
+	struct branch_info new_branch_info = { 0 };
 
 	memset(&opts, 0, sizeof(opts));
 	opts.dwim_new_local_branch = 1;
@@ -1862,7 +1885,8 @@ int cmd_switch(int argc, const char **argv, const char *prefix)
 	cb_option = 'c';
 
 	ret = checkout_main(argc, argv, prefix, &opts,
-			    options, switch_branch_usage);
+			    options, switch_branch_usage, &new_branch_info);
+	branch_info_release(&new_branch_info);
 	FREE_AND_NULL(options);
 	return ret;
 }
@@ -1884,6 +1908,7 @@ int cmd_restore(int argc, const char **argv, const char *prefix)
 		OPT_END()
 	};
 	int ret;
+	struct branch_info new_branch_info = { 0 };
 
 	memset(&opts, 0, sizeof(opts));
 	opts.accept_ref = 0;
@@ -1899,7 +1924,8 @@ int cmd_restore(int argc, const char **argv, const char *prefix)
 	options = add_checkout_path_options(&opts, options);
 
 	ret = checkout_main(argc, argv, prefix, &opts,
-			    options, restore_usage);
+			    options, restore_usage, &new_branch_info);
+	branch_info_release(&new_branch_info);
 	FREE_AND_NULL(options);
 	return ret;
 }