Merge branch 'jk/pack-objects-no-bitmap-when-splitting'
[gitweb.git] / builtin / hash-object.c
index d7fcf4c13c7e0f0855fba51c6b58d2b06c99984e..61583633182da359556fc65795a8eb740167675c 100644 (file)
 #include "parse-options.h"
 #include "exec_cmd.h"
 
-static void hash_fd(int fd, const char *type, int write_object, const char *path)
+/*
+ * This is to create corrupt objects for debugging and as such it
+ * needs to bypass the data conversion performed by, and the type
+ * limitation imposed by, index_fd() and its callees.
+ */
+static int hash_literally(unsigned char *sha1, int fd, const char *type, unsigned flags)
+{
+       struct strbuf buf = STRBUF_INIT;
+       int ret;
+
+       if (strbuf_read(&buf, fd, 4096) < 0)
+               ret = -1;
+       else if (flags & HASH_WRITE_OBJECT)
+               ret = write_sha1_file(buf.buf, buf.len, type, sha1);
+       else
+               ret = hash_sha1_file(buf.buf, buf.len, type, sha1);
+       strbuf_release(&buf);
+       return ret;
+}
+
+static void hash_fd(int fd, const char *type, const char *path, unsigned flags,
+                   int literally)
 {
        struct stat st;
        unsigned char sha1[20];
-       unsigned flags = (HASH_FORMAT_CHECK |
-                         (write_object ? HASH_WRITE_OBJECT : 0));
 
        if (fstat(fd, &st) < 0 ||
-           index_fd(sha1, fd, &st, type_from_string(type), path, flags))
-               die(write_object
+           (literally
+            ? hash_literally(sha1, fd, type, flags)
+            : index_fd(sha1, fd, &st, type_from_string(type), path, flags)))
+               die((flags & HASH_WRITE_OBJECT)
                    ? "Unable to add %s to database"
                    : "Unable to hash %s", path);
        printf("%s\n", sha1_to_hex(sha1));
        maybe_flush_or_die(stdout, "hash to stdout");
 }
 
-static void hash_object(const char *path, const char *type, int write_object,
-                       const char *vpath)
+static void hash_object(const char *path, const char *type, const char *vpath,
+                       unsigned flags, int literally)
 {
        int fd;
        fd = open(path, O_RDONLY);
        if (fd < 0)
                die_errno("Cannot open '%s'", path);
-       hash_fd(fd, type, write_object, vpath);
+       hash_fd(fd, type, vpath, flags, literally);
 }
 
-static int no_filters;
-
-static void hash_stdin_paths(const char *type, int write_objects)
+static void hash_stdin_paths(const char *type, int no_filters, unsigned flags,
+                            int literally)
 {
        struct strbuf buf = STRBUF_INIT, nbuf = STRBUF_INIT;
 
@@ -49,47 +69,46 @@ static void hash_stdin_paths(const char *type, int write_objects)
                                die("line is badly quoted");
                        strbuf_swap(&buf, &nbuf);
                }
-               hash_object(buf.buf, type, write_objects,
-                   no_filters ? NULL : buf.buf);
+               hash_object(buf.buf, type, no_filters ? NULL : buf.buf, flags,
+                           literally);
        }
        strbuf_release(&buf);
        strbuf_release(&nbuf);
 }
 
-static const char * const hash_object_usage[] = {
-       N_("git hash-object [-t <type>] [-w] [--path=<file>|--no-filters] [--stdin] [--] <file>..."),
-       N_("git hash-object  --stdin-paths < <list-of-paths>"),
-       NULL
-};
-
-static const char *type;
-static int write_object;
-static int hashstdin;
-static int stdin_paths;
-static const char *vpath;
-
-static const struct option hash_object_options[] = {
-       OPT_STRING('t', NULL, &type, N_("type"), N_("object type")),
-       OPT_BOOL('w', NULL, &write_object, N_("write the object into the object database")),
-       OPT_COUNTUP( 0 , "stdin", &hashstdin, N_("read the object from stdin")),
-       OPT_BOOL( 0 , "stdin-paths", &stdin_paths, N_("read file names from stdin")),
-       OPT_BOOL( 0 , "no-filters", &no_filters, N_("store file as is without filters")),
-       OPT_STRING( 0 , "path", &vpath, N_("file"), N_("process file as it were from this path")),
-       OPT_END()
-};
-
 int cmd_hash_object(int argc, const char **argv, const char *prefix)
 {
+       static const char * const hash_object_usage[] = {
+               N_("git hash-object [-t <type>] [-w] [--path=<file>|--no-filters] [--stdin] [--] <file>..."),
+               N_("git hash-object  --stdin-paths < <list-of-paths>"),
+               NULL
+       };
+       const char *type = blob_type;
+       int hashstdin = 0;
+       int stdin_paths = 0;
+       int no_filters = 0;
+       int literally = 0;
+       unsigned flags = HASH_FORMAT_CHECK;
+       const char *vpath = NULL;
+       const struct option hash_object_options[] = {
+               OPT_STRING('t', NULL, &type, N_("type"), N_("object type")),
+               OPT_BIT('w', NULL, &flags, N_("write the object into the object database"),
+                       HASH_WRITE_OBJECT),
+               OPT_COUNTUP( 0 , "stdin", &hashstdin, N_("read the object from stdin")),
+               OPT_BOOL( 0 , "stdin-paths", &stdin_paths, N_("read file names from stdin")),
+               OPT_BOOL( 0 , "no-filters", &no_filters, N_("store file as is without filters")),
+               OPT_BOOL( 0, "literally", &literally, N_("just hash any random garbage to create corrupt objects for debugging Git")),
+               OPT_STRING( 0 , "path", &vpath, N_("file"), N_("process file as it were from this path")),
+               OPT_END()
+       };
        int i;
        int prefix_length = -1;
        const char *errstr = NULL;
 
-       type = blob_type;
-
        argc = parse_options(argc, argv, NULL, hash_object_options,
                             hash_object_usage, 0);
 
-       if (write_object) {
+       if (flags & HASH_WRITE_OBJECT) {
                prefix = setup_git_directory();
                prefix_length = prefix ? strlen(prefix) : 0;
                if (vpath && prefix)
@@ -119,19 +138,19 @@ int cmd_hash_object(int argc, const char **argv, const char *prefix)
        }
 
        if (hashstdin)
-               hash_fd(0, type, write_object, vpath);
+               hash_fd(0, type, vpath, flags, literally);
 
        for (i = 0 ; i < argc; i++) {
                const char *arg = argv[i];
 
                if (0 <= prefix_length)
                        arg = prefix_filename(prefix, prefix_length, arg);
-               hash_object(arg, type, write_object,
-                           no_filters ? NULL : vpath ? vpath : arg);
+               hash_object(arg, type, no_filters ? NULL : vpath ? vpath : arg,
+                           flags, literally);
        }
 
        if (stdin_paths)
-               hash_stdin_paths(type, write_object);
+               hash_stdin_paths(type, no_filters, flags, literally);
 
        return 0;
 }