build-in git-mktree

Signed-off-by: Junio C Hamano <gitster@pobox.com>

builtin-mktree.c

@@ -0,0 +1,127 @@
+/*
+ * GIT - the stupid content tracker
+ *
+ * Copyright (c) Junio C Hamano, 2006, 2009
+ */
+#include "builtin.h"
+#include "quote.h"
+#include "tree.h"
+
+static struct treeent {
+	unsigned mode;
+	unsigned char sha1[20];
+	int len;
+	char name[FLEX_ARRAY];
+} **entries;
+static int alloc, used;
+
+static void append_to_tree(unsigned mode, unsigned char *sha1, char *path)
+{
+	struct treeent *ent;
+	int len = strlen(path);
+	if (strchr(path, '/'))
+		die("path %s contains slash", path);
+
+	if (alloc <= used) {
+		alloc = alloc_nr(used);
+		entries = xrealloc(entries, sizeof(*entries) * alloc);
+	}
+	ent = entries[used++] = xmalloc(sizeof(**entries) + len + 1);
+	ent->mode = mode;
+	ent->len = len;
+	hashcpy(ent->sha1, sha1);
+	memcpy(ent->name, path, len+1);
+}
+
+static int ent_compare(const void *a_, const void *b_)
+{
+	struct treeent *a = *(struct treeent **)a_;
+	struct treeent *b = *(struct treeent **)b_;
+	return base_name_compare(a->name, a->len, a->mode,
+				 b->name, b->len, b->mode);
+}
+
+static void write_tree(unsigned char *sha1)
+{
+	struct strbuf buf;
+	size_t size;
+	int i;
+
+	qsort(entries, used, sizeof(*entries), ent_compare);
+	for (size = i = 0; i < used; i++)
+		size += 32 + entries[i]->len;
+
+	strbuf_init(&buf, size);
+	for (i = 0; i < used; i++) {
+		struct treeent *ent = entries[i];
+		strbuf_addf(&buf, "%o %s%c", ent->mode, ent->name, '\0');
+		strbuf_add(&buf, ent->sha1, 20);
+	}
+
+	write_sha1_file(buf.buf, buf.len, tree_type, sha1);
+}
+
+static const char mktree_usage[] = "git mktree [-z]";
+
+int cmd_mktree(int ac, const char **av, const char *prefix)
+{
+	struct strbuf sb = STRBUF_INIT;
+	struct strbuf p_uq = STRBUF_INIT;
+	unsigned char sha1[20];
+	int line_termination = '\n';
+
+	while ((1 < ac) && av[1][0] == '-') {
+		const char *arg = av[1];
+		if (!strcmp("-z", arg))
+			line_termination = 0;
+		else
+			usage(mktree_usage);
+		ac--;
+		av++;
+	}
+
+	while (strbuf_getline(&sb, stdin, line_termination) != EOF) {
+		char *ptr, *ntr;
+		unsigned mode;
+		enum object_type type;
+		char *path;
+
+		ptr = sb.buf;
+		/*
+		 * Read non-recursive ls-tree output format:
+		 *     mode SP type SP sha1 TAB name
+		 */
+		mode = strtoul(ptr, &ntr, 8);
+		if (ptr == ntr || !ntr || *ntr != ' ')
+			die("input format error: %s", sb.buf);
+		ptr = ntr + 1; /* type */
+		ntr = strchr(ptr, ' ');
+		if (!ntr || sb.buf + sb.len <= ntr + 40 ||
+		    ntr[41] != '\t' ||
+		    get_sha1_hex(ntr + 1, sha1))
+			die("input format error: %s", sb.buf);
+		type = sha1_object_info(sha1, NULL);
+		if (type < 0)
+			die("object %s unavailable", sha1_to_hex(sha1));
+		*ntr++ = 0; /* now at the beginning of SHA1 */
+		if (type != type_from_string(ptr))
+			die("object type %s mismatch (%s)", ptr, typename(type));
+
+		path = ntr + 41;  /* at the beginning of name */
+		if (line_termination && path[0] == '"') {
+			strbuf_reset(&p_uq);
+			if (unquote_c_style(&p_uq, path, NULL)) {
+				die("invalid quoting");
+			}
+			path = p_uq.buf;
+		}
+
+		append_to_tree(mode, sha1, path);
+	}
+	strbuf_release(&p_uq);
+	strbuf_release(&sb);
+
+	write_tree(sha1);
+	puts(sha1_to_hex(sha1));
+	exit(0);
+}