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Merge branch 'jc/hash-object'

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"hash-object" learned a new "--literally" option to hash any random
garbage into a loose object, to allow us to create a test data for
mechanisms to catch corrupt objects.

* jc/hash-object:
  hash-object: add --literally option
  hash-object: pass 'write_object' as a flag
  hash-object: reduce file-scope statics
This commit is contained in:
Junio C Hamano 2014-09-26 14:39:43 -07:00
commit 868440f546
1 changed files with 61 additions and 42 deletions
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103
builtin/hash-object.c
View File

@ -10,35 +10,55 @@
#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;
}