This is allows "hash-object --stdin" to just hash any garbage into a
"loose object" that may not pass the standard object parsing check
or fsck, so that different kind of corrupt objects third-party tools
may create can be imitated in our test suite. That would in turn
allow us to test features that catch these corrupt objects.
Signed-off-by: Junio C Hamano <gitster@xxxxxxxxx>
---
builtin/hash-object.c | 45 ++++++++++++++++++++++++++++++++++++---------
1 file changed, 36 insertions(+), 9 deletions(-)
diff --git a/builtin/hash-object.c b/builtin/hash-object.c
index 1fb07ee..6158363 100644
--- a/builtin/hash-object.c
+++ b/builtin/hash-object.c
@@ -10,13 +10,36 @@
#include "parse-options.h"
#include "exec_cmd.h"
-static void hash_fd(int fd, const char *type, const char *path, unsigned flags)
+/*
+ * 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];
if (fstat(fd, &st) < 0 ||
- index_fd(sha1, fd, &st, type_from_string(type), path, flags))
+ (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);
@@ -25,16 +48,17 @@ static void hash_fd(int fd, const char *type, const char *path, unsigned flags)
}
static void hash_object(const char *path, const char *type, const char *vpath,
- unsigned flags)
+ unsigned flags, int literally)
{
int fd;
fd = open(path, O_RDONLY);
if (fd < 0)
die_errno("Cannot open '%s'", path);
- hash_fd(fd, type, vpath, flags);
+ hash_fd(fd, type, vpath, flags, literally);
}
-static void hash_stdin_paths(const char *type, int no_filters, unsigned flags)
+static void hash_stdin_paths(const char *type, int no_filters, unsigned flags,
+ int literally)
{
struct strbuf buf = STRBUF_INIT, nbuf = STRBUF_INIT;
@@ -45,7 +69,8 @@ static void hash_stdin_paths(const char *type, int no_filters, unsigned flags)
die("line is badly quoted");
strbuf_swap(&buf, &nbuf);
}
- hash_object(buf.buf, type, no_filters ? NULL : buf.buf, flags);
+ hash_object(buf.buf, type, no_filters ? NULL : buf.buf, flags,
+ literally);
}
strbuf_release(&buf);
strbuf_release(&nbuf);
@@ -62,6 +87,7 @@ int cmd_hash_object(int argc, const char **argv, const char *prefix)
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[] = {
@@ -71,6 +97,7 @@ int cmd_hash_object(int argc, const char **argv, const char *prefix)
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()
};
@@ -111,7 +138,7 @@ int cmd_hash_object(int argc, const char **argv, const char *prefix)
}
if (hashstdin)
- hash_fd(0, type, vpath, flags);
+ hash_fd(0, type, vpath, flags, literally);
for (i = 0 ; i < argc; i++) {
const char *arg = argv[i];
@@ -119,11 +146,11 @@ int cmd_hash_object(int argc, const char **argv, const char *prefix)
if (0 <= prefix_length)
arg = prefix_filename(prefix, prefix_length, arg);
hash_object(arg, type, no_filters ? NULL : vpath ? vpath : arg,
- flags);
+ flags, literally);
}
if (stdin_paths)
- hash_stdin_paths(type, no_filters, flags);
+ hash_stdin_paths(type, no_filters, flags, literally);
return 0;
}
--
2.1.0-459-g1bc3b2b
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