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-rw-r--r--builtin/hash-object.c174
1 files changed, 174 insertions, 0 deletions
diff --git a/builtin/hash-object.c b/builtin/hash-object.c
new file mode 100644
index 0000000..5ffec99
--- /dev/null
+++ b/builtin/hash-object.c
@@ -0,0 +1,174 @@
+/*
+ * GIT - The information manager from hell
+ *
+ * Copyright (C) Linus Torvalds, 2005
+ * Copyright (C) Junio C Hamano, 2005
+ */
+#include "builtin.h"
+#include "abspath.h"
+#include "config.h"
+#include "gettext.h"
+#include "hex.h"
+#include "object-file.h"
+#include "object-store-ll.h"
+#include "blob.h"
+#include "quote.h"
+#include "parse-options.h"
+#include "exec-cmd.h"
+#include "setup.h"
+#include "strbuf.h"
+#include "write-or-die.h"
+
+/*
+ * 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(struct object_id *oid, int fd, const char *type, unsigned flags)
+{
+ struct strbuf buf = STRBUF_INIT;
+ int ret;
+
+ if (strbuf_read(&buf, fd, 4096) < 0)
+ ret = -1;
+ else
+ ret = write_object_file_literally(buf.buf, buf.len, type, oid,
+ flags);
+ close(fd);
+ strbuf_release(&buf);
+ return ret;
+}
+
+static void hash_fd(int fd, const char *type, const char *path, unsigned flags,
+ int literally)
+{
+ struct stat st;
+ struct object_id oid;
+
+ if (fstat(fd, &st) < 0 ||
+ (literally
+ ? hash_literally(&oid, fd, type, flags)
+ : index_fd(the_repository->index, &oid, 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", oid_to_hex(&oid));
+ maybe_flush_or_die(stdout, "hash to stdout");
+}
+
+static void hash_object(const char *path, const char *type, const char *vpath,
+ unsigned flags, int literally)
+{
+ int fd;
+ fd = xopen(path, O_RDONLY);
+ hash_fd(fd, type, vpath, flags, literally);
+}
+
+static void hash_stdin_paths(const char *type, int no_filters, unsigned flags,
+ int literally)
+{
+ struct strbuf buf = STRBUF_INIT;
+ struct strbuf unquoted = STRBUF_INIT;
+
+ while (strbuf_getline(&buf, stdin) != EOF) {
+ if (buf.buf[0] == '"') {
+ strbuf_reset(&unquoted);
+ if (unquote_c_style(&unquoted, buf.buf, NULL))
+ die("line is badly quoted");
+ strbuf_swap(&buf, &unquoted);
+ }
+ hash_object(buf.buf, type, no_filters ? NULL : buf.buf, flags,
+ literally);
+ }
+ strbuf_release(&buf);
+ strbuf_release(&unquoted);
+}
+
+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]\n"
+ " [--stdin [--literally]] [--] <file>..."),
+ N_("git hash-object [-t <type>] [-w] --stdin-paths [--no-filters]"),
+ NULL
+ };
+ const char *type = blob_type;
+ int hashstdin = 0;
+ int stdin_paths = 0;
+ int no_filters = 0;
+ int literally = 0;
+ int nongit = 0;
+ unsigned flags = HASH_FORMAT_CHECK;
+ const char *vpath = NULL;
+ char *vpath_free = 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;
+ const char *errstr = NULL;
+
+ argc = parse_options(argc, argv, prefix, hash_object_options,
+ hash_object_usage, 0);
+
+ if (flags & HASH_WRITE_OBJECT)
+ prefix = setup_git_directory();
+ else
+ prefix = setup_git_directory_gently(&nongit);
+
+ if (vpath && prefix) {
+ vpath_free = prefix_filename(prefix, vpath);
+ vpath = vpath_free;
+ }
+
+ git_config(git_default_config, NULL);
+
+ if (stdin_paths) {
+ if (hashstdin)
+ errstr = "Can't use --stdin-paths with --stdin";
+ else if (argc)
+ errstr = "Can't specify files with --stdin-paths";
+ else if (vpath)
+ errstr = "Can't use --stdin-paths with --path";
+ }
+ else {
+ if (hashstdin > 1)
+ errstr = "Multiple --stdin arguments are not supported";
+ if (vpath && no_filters)
+ errstr = "Can't use --path with --no-filters";
+ }
+
+ if (errstr) {
+ error("%s", errstr);
+ usage_with_options(hash_object_usage, hash_object_options);
+ }
+
+ if (hashstdin)
+ hash_fd(0, type, vpath, flags, literally);
+
+ for (i = 0 ; i < argc; i++) {
+ const char *arg = argv[i];
+ char *to_free = NULL;
+
+ if (prefix)
+ arg = to_free = prefix_filename(prefix, arg);
+ hash_object(arg, type, no_filters ? NULL : vpath ? vpath : arg,
+ flags, literally);
+ free(to_free);
+ }
+
+ if (stdin_paths)
+ hash_stdin_paths(type, no_filters, flags, literally);
+
+ free(vpath_free);
+
+ return 0;
+}