Merge commit 'v1.7.0' into jc/checkout-reflog-fix

* commit 'v1.7.0': (4188 commits)
  Git 1.7.0
  Fix typo in 1.6.6.2 release notes
  Re-fix check-ref-format documentation mark-up
  archive documentation: attributes are taken from the tree by default
  Documentation: minor fixes to RelNotes-1.7.0
  bash: support 'git am's new '--continue' option
  filter-branch: Fix error message for --prune-empty --commit-filter
  am: switch --resolved to --continue
  Update draft release notes to 1.7.0 one more time
  Git 1.6.6.2
  t8003: check exit code of command and error message separately
  check-ref-format documentation: fix enumeration mark-up
  Documentation: quote braces in {upstream} notation
  t3902: Protect against OS X normalization
  blame: prevent a segv when -L given start > EOF
  git-push: document all the status flags used in the output
  Fix parsing of imap.preformattedHTML and imap.sslverify
  git-add documentation: Fix shell quoting example
  Revert "pack-objects: fix pack generation when using pack_size_limit"
  archive: simplify archive format guessing
  ...

1 files changed, 173 insertions, 0 deletions

diff --git a/submodule.c b/submodule.c
new file mode 100644
index 0000000000..7d70c4f7bf
--- /dev/null
+++ b/submodule.c
@@ -0,0 +1,173 @@
+#include "cache.h"
+#include "submodule.h"
+#include "dir.h"
+#include "diff.h"
+#include "commit.h"
+#include "revision.h"
+#include "run-command.h"
+
+static int add_submodule_odb(const char *path)
+{
+	struct strbuf objects_directory = STRBUF_INIT;
+	struct alternate_object_database *alt_odb;
+	int ret = 0;
+
+	strbuf_addf(&objects_directory, "%s/.git/objects/", path);
+	if (!is_directory(objects_directory.buf)) {
+		ret = -1;
+		goto done;
+	}
+	/* avoid adding it twice */
+	for (alt_odb = alt_odb_list; alt_odb; alt_odb = alt_odb->next)
+		if (alt_odb->name - alt_odb->base == objects_directory.len &&
+				!strncmp(alt_odb->base, objects_directory.buf,
+					objects_directory.len))
+			goto done;
+
+	alt_odb = xmalloc(objects_directory.len + 42 + sizeof(*alt_odb));
+	alt_odb->next = alt_odb_list;
+	strcpy(alt_odb->base, objects_directory.buf);
+	alt_odb->name = alt_odb->base + objects_directory.len;
+	alt_odb->name[2] = '/';
+	alt_odb->name[40] = '\0';
+	alt_odb->name[41] = '\0';
+	alt_odb_list = alt_odb;
+	prepare_alt_odb();
+done:
+	strbuf_release(&objects_directory);
+	return ret;
+}
+
+void show_submodule_summary(FILE *f, const char *path,
+		unsigned char one[20], unsigned char two[20],
+		unsigned dirty_submodule,
+		const char *del, const char *add, const char *reset)
+{
+	struct rev_info rev;
+	struct commit *commit, *left = left, *right = right;
+	struct commit_list *merge_bases, *list;
+	const char *message = NULL;
+	struct strbuf sb = STRBUF_INIT;
+	static const char *format = "  %m %s";
+	int fast_forward = 0, fast_backward = 0;
+
+	if (is_null_sha1(two))
+		message = "(submodule deleted)";
+	else if (add_submodule_odb(path))
+		message = "(not checked out)";
+	else if (is_null_sha1(one))
+		message = "(new submodule)";
+	else if (!(left = lookup_commit_reference(one)) ||
+		 !(right = lookup_commit_reference(two)))
+		message = "(commits not present)";
+
+	if (!message) {
+		init_revisions(&rev, NULL);
+		setup_revisions(0, NULL, &rev, NULL);
+		rev.left_right = 1;
+		rev.first_parent_only = 1;
+		left->object.flags |= SYMMETRIC_LEFT;
+		add_pending_object(&rev, &left->object, path);
+		add_pending_object(&rev, &right->object, path);
+		merge_bases = get_merge_bases(left, right, 1);
+		if (merge_bases) {
+			if (merge_bases->item == left)
+				fast_forward = 1;
+			else if (merge_bases->item == right)
+				fast_backward = 1;
+		}
+		for (list = merge_bases; list; list = list->next) {
+			list->item->object.flags |= UNINTERESTING;
+			add_pending_object(&rev, &list->item->object,
+				sha1_to_hex(list->item->object.sha1));
+		}
+		if (prepare_revision_walk(&rev))
+			message = "(revision walker failed)";
+	}
+
+	strbuf_addf(&sb, "Submodule %s %s..", path,
+			find_unique_abbrev(one, DEFAULT_ABBREV));
+	if (!fast_backward && !fast_forward)
+		strbuf_addch(&sb, '.');
+	strbuf_addf(&sb, "%s", find_unique_abbrev(two, DEFAULT_ABBREV));
+	if (dirty_submodule)
+		strbuf_add(&sb, "-dirty", 6);
+	if (message)
+		strbuf_addf(&sb, " %s\n", message);
+	else
+		strbuf_addf(&sb, "%s:\n", fast_backward ? " (rewind)" : "");
+	fwrite(sb.buf, sb.len, 1, f);
+
+	if (!message) {
+		while ((commit = get_revision(&rev))) {
+			struct pretty_print_context ctx = {0};
+			ctx.date_mode = rev.date_mode;
+			strbuf_setlen(&sb, 0);
+			if (commit->object.flags & SYMMETRIC_LEFT) {
+				if (del)
+					strbuf_addstr(&sb, del);
+			}
+			else if (add)
+				strbuf_addstr(&sb, add);
+			format_commit_message(commit, format, &sb, &ctx);
+			if (reset)
+				strbuf_addstr(&sb, reset);
+			strbuf_addch(&sb, '\n');
+			fprintf(f, "%s", sb.buf);
+		}
+		clear_commit_marks(left, ~0);
+		clear_commit_marks(right, ~0);
+	}
+	strbuf_release(&sb);
+}
+
+int is_submodule_modified(const char *path)
+{
+	int len;
+	struct child_process cp;
+	const char *argv[] = {
+		"status",
+		"--porcelain",
+		NULL,
+	};
+	char *env[4];
+	struct strbuf buf = STRBUF_INIT;
+
+	strbuf_addf(&buf, "%s/.git/", path);
+	if (!is_directory(buf.buf)) {
+		strbuf_release(&buf);
+		/* The submodule is not checked out, so it is not modified */
+		return 0;
+
+	}
+	strbuf_reset(&buf);
+
+	strbuf_addf(&buf, "GIT_WORK_TREE=%s", path);
+	env[0] = strbuf_detach(&buf, NULL);
+	strbuf_addf(&buf, "GIT_DIR=%s/.git", path);
+	env[1] = strbuf_detach(&buf, NULL);
+	strbuf_addf(&buf, "GIT_INDEX_FILE");
+	env[2] = strbuf_detach(&buf, NULL);
+	env[3] = NULL;
+
+	memset(&cp, 0, sizeof(cp));
+	cp.argv = argv;
+	cp.env = (const char *const *)env;
+	cp.git_cmd = 1;
+	cp.no_stdin = 1;
+	cp.out = -1;
+	if (start_command(&cp))
+		die("Could not run git status --porcelain");
+
+	len = strbuf_read(&buf, cp.out, 1024);
+	close(cp.out);
+
+	if (finish_command(&cp))
+		die("git status --porcelain failed");
+
+	free(env[0]);
+	free(env[1]);
+	free(env[2]);
+	strbuf_release(&buf);
+	return len != 0;
+}