X-Git-Url: https://git.octo.it/?a=blobdiff_plain;f=write-tree.c;h=bd07da6183b25470b00b9a2eedef29b7275760ec;hb=HEAD;hp=6e531b40a84914cf1b37e12f8629fecbec0ae041;hpb=19b2860cba5742ab31fd682b80fefefac19be141;p=git.git

diff --git a/write-tree.c b/write-tree.c
index 6e531b40..bd07da61 100644
--- a/write-tree.c
+++ b/write-tree.c
@@ -4,68 +4,69 @@
  * Copyright (C) Linus Torvalds, 2005
  */
 #include "cache.h"
+#include "tree.h"
+#include "cache-tree.h"
 
-static int check_valid_sha1(unsigned char *sha1)
-{
-	char *filename = sha1_file_name(sha1);
-	int ret;
-
-	/* If we were anal, we'd check that the sha1 of the contents actually matches */
-	ret = access(filename, R_OK);
-	if (ret)
-		perror(filename);
-	return ret;
-}
+static int missing_ok = 0;
+static char *prefix = NULL;
 
-static int prepend_integer(char *buffer, unsigned val, int i)
-{
-	buffer[--i] = '\0';
-	do {
-		buffer[--i] = '0' + (val % 10);
-		val /= 10;
-	} while (val);
-	return i;
-}
+static const char write_tree_usage[] =
+"git-write-tree [--missing-ok] [--prefix=<prefix>/]";
 
-#define ORIG_OFFSET (40)	/* Enough space to add the header of "tree <size>\0" */
+static struct lock_file lock_file;
 
 int main(int argc, char **argv)
 {
-	unsigned long size, offset;
-	int i, entries = read_cache();
-	char *buffer;
+	int entries, was_valid, newfd;
 
-	if (entries <= 0) {
-		fprintf(stderr, "No file-cache to create a tree of\n");
-		exit(1);
-	}
+	setup_git_directory();
 
-	/* Guess at an initial size */
-	size = entries * 40 + 400;
-	buffer = malloc(size);
-	offset = ORIG_OFFSET;
+	newfd = hold_lock_file_for_update(&lock_file, get_index_file());
+	entries = read_cache();
 
-	for (i = 0; i < entries; i++) {
-		struct cache_entry *ce = active_cache[i];
-		if (check_valid_sha1(ce->sha1) < 0)
-			exit(1);
-		if (offset + ce->namelen + 60 > size) {
-			size = alloc_nr(offset + ce->namelen + 60);
-			buffer = realloc(buffer, size);
-		}
-		offset += sprintf(buffer + offset, "%o %s", ce->st_mode, ce->name);
-		buffer[offset++] = 0;
-		memcpy(buffer + offset, ce->sha1, 20);
-		offset += 20;
+	while (1 < argc) {
+		char *arg = argv[1];
+		if (!strcmp(arg, "--missing-ok"))
+			missing_ok = 1;
+		else if (!strncmp(arg, "--prefix=", 9))
+			prefix = arg + 9;
+		else
+			die(write_tree_usage);
+		argc--; argv++;
 	}
 
-	i = prepend_integer(buffer, offset - ORIG_OFFSET, ORIG_OFFSET);
-	i -= 5;
-	memcpy(buffer+i, "tree ", 5);
+	if (argc > 2)
+		die("too many options");
+
+	if (entries < 0)
+		die("git-write-tree: error reading cache");
 
-	buffer += i;
-	offset -= i;
+	if (!active_cache_tree)
+		active_cache_tree = cache_tree();
 
-	write_sha1_file(buffer, offset);
+	was_valid = cache_tree_fully_valid(active_cache_tree);
+	if (!was_valid) {
+		if (cache_tree_update(active_cache_tree,
+				      active_cache, active_nr,
+				      missing_ok, 0) < 0)
+			die("git-write-tree: error building trees");
+		if (0 <= newfd) {
+			if (!write_cache(newfd, active_cache, active_nr))
+				commit_lock_file(&lock_file);
+		}
+		/* Not being able to write is fine -- we are only interested
+		 * in updating the cache-tree part, and if the next caller
+		 * ends up using the old index with unupdated cache-tree part
+		 * it misses the work we did here, but that is just a
+		 * performance penalty and not a big deal.
+		 */
+	}
+	if (prefix) {
+		struct cache_tree *subtree =
+			cache_tree_find(active_cache_tree, prefix);
+		printf("%s\n", sha1_to_hex(subtree->sha1));
+	}
+	else
+		printf("%s\n", sha1_to_hex(active_cache_tree->sha1));
 	return 0;
 }