X-Git-Url: https://git.octo.it/?a=blobdiff_plain;f=sha1_file.c;h=e3d011309a610ad2b81eeabe810e3844e946734b;hb=cbdda024049947366804d60bdc5e5fc3ab3ee3a5;hp=1d799f793a936a696cea86deb36fa2bdb04c29f4;hpb=73be17f0b387b2741646498a9a80da677a9e0c7a;p=git.git

diff --git a/sha1_file.c b/sha1_file.c
index 1d799f79..e3d01130 100644
--- a/sha1_file.c
+++ b/sha1_file.c
@@ -9,6 +9,10 @@
 #include "cache.h"
 #include "delta.h"
 #include "pack.h"
+#include "blob.h"
+#include "commit.h"
+#include "tag.h"
+#include "tree.h"
 
 #ifndef O_NOATIME
 #if defined(__linux__) && (defined(__i386__) || defined(__PPC__))
@@ -247,6 +251,7 @@ static void link_alt_odb_entries(const char *alt, const char *ep, int sep,
 		for ( ; cp < ep && *cp != sep; cp++)
 			;
 		if (last != cp) {
+			struct stat st;
 			struct alternate_object_database *alt;
 			/* 43 = 40-byte + 2 '/' + terminating NUL */
 			int pfxlen = cp - last;
@@ -269,9 +274,19 @@ static void link_alt_odb_entries(const char *alt, const char *ep, int sep,
 			}
 			else
 				memcpy(ent->base, last, pfxlen);
+
 			ent->name = ent->base + pfxlen + 1;
-			ent->base[pfxlen] = ent->base[pfxlen + 3] = '/';
-			ent->base[entlen-1] = 0;
+			ent->base[pfxlen + 3] = '/';
+			ent->base[pfxlen] = ent->base[entlen-1] = 0;
+
+			/* Detect cases where alternate disappeared */
+			if (stat(ent->base, &st) || !S_ISDIR(st.st_mode)) {
+				error("object directory %s does not exist; "
+				      "check .git/objects/info/alternates.",
+				      ent->base);
+				goto bad;
+			}
+			ent->base[pfxlen] = '/';
 
 			/* Prevent the common mistake of listing the same
 			 * thing twice, or object directory itself.
@@ -552,7 +567,9 @@ static void prepare_packed_git_one(char *objdir, int local)
 	len = strlen(path);
 	dir = opendir(path);
 	if (!dir) {
-		fprintf(stderr, "unable to open object pack directory: %s: %s\n", path, strerror(errno));
+		if (errno != ENOENT)
+			error("unable to open object pack directory: %s: %s",
+			      path, strerror(errno));
 		return;
 	}
 	path[len++] = '/';
@@ -791,10 +808,12 @@ static int packed_delta_info(unsigned char *base_sha1,
 		 * the result size.
 		 */
 		data = delta_head;
-		get_delta_hdr_size(&data); /* ignore base size */
+
+		/* ignore base size */
+		get_delta_hdr_size(&data, delta_head+sizeof(delta_head));
 
 		/* Read the result size */
-		result_size = get_delta_hdr_size(&data);
+		result_size = get_delta_hdr_size(&data, delta_head+sizeof(delta_head));
 		*sizep = result_size;
 	}
 	return 0;
@@ -828,6 +847,25 @@ static unsigned long unpack_object_header(struct packed_git *p, unsigned long of
 	return offset;
 }
 
+int check_reuse_pack_delta(struct packed_git *p, unsigned long offset,
+			   unsigned char *base, unsigned long *sizep,
+			   enum object_type *kindp)
+{
+	unsigned long ptr;
+	int status = -1;
+
+	use_packed_git(p);
+	ptr = offset;
+	ptr = unpack_object_header(p, ptr, kindp, sizep);
+	if (*kindp != OBJ_DELTA)
+		goto done;
+	memcpy(base, p->pack_base + ptr, 20);
+	status = 0;
+ done:
+	unuse_packed_git(p);
+	return status;
+}
+
 void packed_object_info_detail(struct pack_entry *e,
 			       char *type,
 			       unsigned long *size,
@@ -862,16 +900,16 @@ void packed_object_info_detail(struct pack_entry *e,
 	}
 	switch (kind) {
 	case OBJ_COMMIT:
-		strcpy(type, "commit");
+		strcpy(type, commit_type);
 		break;
 	case OBJ_TREE:
-		strcpy(type, "tree");
+		strcpy(type, tree_type);
 		break;
 	case OBJ_BLOB:
-		strcpy(type, "blob");
+		strcpy(type, blob_type);
 		break;
 	case OBJ_TAG:
-		strcpy(type, "tag");
+		strcpy(type, tag_type);
 		break;
 	default:
 		die("corrupted pack file %s containing object of kind %d",
@@ -902,16 +940,16 @@ static int packed_object_info(struct pack_entry *entry,
 		unuse_packed_git(p);
 		return retval;
 	case OBJ_COMMIT:
-		strcpy(type, "commit");
+		strcpy(type, commit_type);
 		break;
 	case OBJ_TREE:
-		strcpy(type, "tree");
+		strcpy(type, tree_type);
 		break;
 	case OBJ_BLOB:
-		strcpy(type, "blob");
+		strcpy(type, blob_type);
 		break;
 	case OBJ_TAG:
-		strcpy(type, "tag");
+		strcpy(type, tag_type);
 		break;
 	default:
 		die("corrupted pack file %s containing object of kind %d",
@@ -941,6 +979,16 @@ static void *unpack_delta_entry(unsigned char *base_sha1,
 
 	if (left < 20)
 		die("truncated pack file");
+
+	/* The base entry _must_ be in the same pack */
+	if (!find_pack_entry_one(base_sha1, &base_ent, p))
+		die("failed to find delta-pack base object %s",
+		    sha1_to_hex(base_sha1));
+	base = unpack_entry_gently(&base_ent, type, &base_size);
+	if (!base)
+		die("failed to read delta-pack base object %s",
+		    sha1_to_hex(base_sha1));
+
 	data = base_sha1 + 20;
 	data_size = left - 20;
 	delta_data = xmalloc(delta_size);
@@ -958,14 +1006,6 @@ static void *unpack_delta_entry(unsigned char *base_sha1,
 	if ((st != Z_STREAM_END) || stream.total_out != delta_size)
 		die("delta data unpack failed");
 
-	/* The base entry _must_ be in the same pack */
-	if (!find_pack_entry_one(base_sha1, &base_ent, p))
-		die("failed to find delta-pack base object %s",
-		    sha1_to_hex(base_sha1));
-	base = unpack_entry_gently(&base_ent, type, &base_size);
-	if (!base)
-		die("failed to read delta-pack base object %s",
-		    sha1_to_hex(base_sha1));
 	result = patch_delta(base, base_size,
 			     delta_data, delta_size,
 			     &result_size);
@@ -1037,16 +1077,16 @@ void *unpack_entry_gently(struct pack_entry *entry,
 		retval = unpack_delta_entry(pack, size, left, type, sizep, p);
 		return retval;
 	case OBJ_COMMIT:
-		strcpy(type, "commit");
+		strcpy(type, commit_type);
 		break;
 	case OBJ_TREE:
-		strcpy(type, "tree");
+		strcpy(type, tree_type);
 		break;
 	case OBJ_BLOB:
-		strcpy(type, "blob");
+		strcpy(type, blob_type);
 		break;
 	case OBJ_TAG:
-		strcpy(type, "tag");
+		strcpy(type, tag_type);
 		break;
 	default:
 		return NULL;
@@ -1207,9 +1247,9 @@ void *read_object_with_reference(const unsigned char *sha1,
 			return buffer;
 		}
 		/* Handle references */
-		else if (!strcmp(type, "commit"))
+		else if (!strcmp(type, commit_type))
 			ref_type = "tree ";
-		else if (!strcmp(type, "tag"))
+		else if (!strcmp(type, tag_type))
 			ref_type = "object ";
 		else {
 			free(buffer);
@@ -1481,7 +1521,8 @@ int write_sha1_from_fd(const unsigned char *sha1, int fd, char *buffer,
 
 	local = mkstemp(tmpfile);
 	if (local < 0)
-		return error("Couldn't open %s for %s\n", tmpfile, sha1_to_hex(sha1));
+		return error("Couldn't open %s for %s",
+			     tmpfile, sha1_to_hex(sha1));
 
 	memset(&stream, 0, sizeof(stream));
 
@@ -1529,7 +1570,7 @@ int write_sha1_from_fd(const unsigned char *sha1, int fd, char *buffer,
 	}
 	if (memcmp(sha1, real_sha1, 20)) {
 		unlink(tmpfile);
-		return error("File %s has bad hash\n", sha1_to_hex(sha1));
+		return error("File %s has bad hash", sha1_to_hex(sha1));
 	}
 
 	return move_temp_to_file(tmpfile, sha1_file_name(sha1));
@@ -1590,7 +1631,7 @@ int index_pipe(unsigned char *sha1, int fd, const char *type, int write_object)
 		return -1;
 	}
 	if (!type)
-		type = "blob";
+		type = blob_type;
 	if (write_object)
 		ret = write_sha1_file(buf, off, type, sha1);
 	else {
@@ -1617,7 +1658,7 @@ int index_fd(unsigned char *sha1, int fd, struct stat *st, int write_object, con
 		return -1;
 
 	if (!type)
-		type = "blob";
+		type = blob_type;
 	if (write_object)
 		ret = write_sha1_file(buf, size, type, sha1);
 	else {
@@ -1655,9 +1696,9 @@ int index_path(unsigned char *sha1, const char *path, struct stat *st, int write
 		if (!write_object) {
 			unsigned char hdr[50];
 			int hdrlen;
-			write_sha1_file_prepare(target, st->st_size, "blob",
+			write_sha1_file_prepare(target, st->st_size, blob_type,
 						sha1, hdr, &hdrlen);
-		} else if (write_sha1_file(target, st->st_size, "blob", sha1))
+		} else if (write_sha1_file(target, st->st_size, blob_type, sha1))
 			return error("%s: failed to insert into database",
 				     path);
 		free(target);