X-Git-Url: https://git.octo.it/?a=blobdiff_plain;f=sha1_file.c;h=895c1fab6fc00b8131e44851f33b79b1d2310b12;hb=babfaba23d530e2818db62161825a65e582adbdc;hp=b6ebbc5c9a29438f365478bced6845bf78854ee2;hpb=1f40c7c24d999675df818f9d7824937a964f9f40;p=git.git

diff --git a/sha1_file.c b/sha1_file.c
index b6ebbc5c..895c1fab 100644
--- a/sha1_file.c
+++ b/sha1_file.c
@@ -20,6 +20,8 @@
 #endif
 #endif
 
+const unsigned char null_sha1[20] = { 0, };
+
 static unsigned int sha1_file_open_flag = O_NOATIME;
 
 static unsigned hexval(char c)
@@ -50,26 +52,33 @@ static char *git_dir, *git_object_dir, *git_index_file, *git_refs_dir,
 	*git_graft_file;
 static void setup_git_env(void)
 {
-	git_dir = gitenv(GIT_DIR_ENVIRONMENT);
+	git_dir = getenv(GIT_DIR_ENVIRONMENT);
 	if (!git_dir)
 		git_dir = DEFAULT_GIT_DIR_ENVIRONMENT;
-	git_object_dir = gitenv(DB_ENVIRONMENT);
+	git_object_dir = getenv(DB_ENVIRONMENT);
 	if (!git_object_dir) {
 		git_object_dir = xmalloc(strlen(git_dir) + 9);
 		sprintf(git_object_dir, "%s/objects", git_dir);
 	}
 	git_refs_dir = xmalloc(strlen(git_dir) + 6);
 	sprintf(git_refs_dir, "%s/refs", git_dir);
-	git_index_file = gitenv(INDEX_ENVIRONMENT);
+	git_index_file = getenv(INDEX_ENVIRONMENT);
 	if (!git_index_file) {
 		git_index_file = xmalloc(strlen(git_dir) + 7);
 		sprintf(git_index_file, "%s/index", git_dir);
 	}
-	git_graft_file = gitenv(GRAFT_ENVIRONMENT);
+	git_graft_file = getenv(GRAFT_ENVIRONMENT);
 	if (!git_graft_file)
 		git_graft_file = strdup(git_path("info/grafts"));
 }
 
+char *get_git_dir(void)
+{
+	if (!git_dir)
+		setup_git_env();
+	return git_dir;
+}
+
 char *get_object_directory(void)
 {
 	if (!git_object_dir)
@@ -240,50 +249,75 @@ static struct alternate_object_database **alt_odb_tail;
  * SHA1, an extra slash for the first level indirection, and the
  * terminating NUL.
  */
-static void link_alt_odb_entries(const char *alt, const char *ep)
+static void link_alt_odb_entries(const char *alt, const char *ep, int sep,
+				 const char *relative_base)
 {
 	const char *cp, *last;
 	struct alternate_object_database *ent;
+	int base_len = -1;
 
 	last = alt;
-	do {
-		for (cp = last; cp < ep && *cp != ':'; cp++)
+	while (last < ep) {
+		cp = last;
+		if (cp < ep && *cp == '#') {
+			while (cp < ep && *cp != sep)
+				cp++;
+			last = cp + 1;
+			continue;
+		}
+		for ( ; cp < ep && *cp != sep; cp++)
 			;
 		if (last != cp) {
 			/* 43 = 40-byte + 2 '/' + terminating NUL */
 			int pfxlen = cp - last;
 			int entlen = pfxlen + 43;
 
+			if (*last != '/' && relative_base) {
+				/* Relative alt-odb */
+				if (base_len < 0)
+					base_len = strlen(relative_base) + 1;
+				entlen += base_len;
+				pfxlen += base_len;
+			}
 			ent = xmalloc(sizeof(*ent) + entlen);
 			*alt_odb_tail = ent;
 			alt_odb_tail = &(ent->next);
 			ent->next = NULL;
-
-			memcpy(ent->base, last, pfxlen);
+			if (*last != '/' && relative_base) {
+				memcpy(ent->base, relative_base, base_len - 1);
+				ent->base[base_len - 1] = '/';
+				memcpy(ent->base + base_len,
+				       last, cp - last);
+			}
+			else
+				memcpy(ent->base, last, pfxlen);
 			ent->name = ent->base + pfxlen + 1;
 			ent->base[pfxlen] = ent->base[pfxlen + 3] = '/';
 			ent->base[entlen-1] = 0;
 		}
-		while (cp < ep && *cp == ':')
+		while (cp < ep && *cp == sep)
 			cp++;
 		last = cp;
-	} while (cp < ep);
+	}
 }
 
 void prepare_alt_odb(void)
 {
 	char path[PATH_MAX];
-	char *map, *ep;
+	char *map;
 	int fd;
 	struct stat st;
-	char *alt = gitenv(ALTERNATE_DB_ENVIRONMENT) ? : "";
+	char *alt;
+
+	alt = getenv(ALTERNATE_DB_ENVIRONMENT);
+	if (!alt) alt = "";
 
-	sprintf(path, "%s/info/alternates", get_object_directory());
 	if (alt_odb_tail)
 		return;
 	alt_odb_tail = &alt_odb_list;
-	link_alt_odb_entries(alt, alt + strlen(alt));
+	link_alt_odb_entries(alt, alt + strlen(alt), ':', NULL);
 
+	sprintf(path, "%s/info/alternates", get_object_directory());
 	fd = open(path, O_RDONLY);
 	if (fd < 0)
 		return;
@@ -296,10 +330,8 @@ void prepare_alt_odb(void)
 	if (map == MAP_FAILED)
 		return;
 
-	/* Remove the trailing newline */
-	for (ep = map + st.st_size - 1; map < ep && ep[-1] == '\n'; ep--)
-		;
-	link_alt_odb_entries(map, ep);
+	link_alt_odb_entries(map, map + st.st_size, '\n',
+			     get_object_directory());
 	munmap(map, st.st_size);
 }
 
@@ -480,7 +512,7 @@ struct packed_git *parse_pack_index(unsigned char *sha1)
 	return parse_pack_index_file(sha1, path);
 }
 
-struct packed_git *parse_pack_index_file(unsigned char *sha1, char *idx_path)
+struct packed_git *parse_pack_index_file(const unsigned char *sha1, char *idx_path)
 {
 	struct packed_git *p;
 	unsigned long idx_size;
@@ -841,7 +873,8 @@ void packed_object_info_detail(struct pack_entry *e,
 		strcpy(type, "tag");
 		break;
 	default:
-		die("corrupted pack file");
+		die("corrupted pack file %s containing object of kind %d",
+		    p->pack_name, kind);
 	}
 	*store_size = 0; /* notyet */
 }
@@ -880,7 +913,8 @@ static int packed_object_info(struct pack_entry *entry,
 		strcpy(type, "tag");
 		break;
 	default:
-		die("corrupted pack file");
+		die("corrupted pack file %s containing object of kind %d",
+		    p->pack_name, kind);
 	}
 	if (sizep)
 		*sizep = size;
@@ -980,7 +1014,7 @@ static void *unpack_entry(struct pack_entry *entry,
 	retval = unpack_entry_gently(entry, type, sizep);
 	unuse_packed_git(p);
 	if (!retval)
-		die("corrupted pack file");
+		die("corrupted pack file %s", p->pack_name);
 	return retval;
 }