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#include "pull.h"
#include "cache.h"
#include "commit.h"
#include "tree.h"
#include "tag.h"
#include "blob.h"
#include "refs.h"
const char *write_ref = NULL;
const unsigned char *current_ref = NULL;
int get_tree = 0;
int get_history = 0;
/* 1 means "get delta", 2 means "really check delta harder */
int get_delta = 1;
int get_all = 0;
int get_verbosely = 0;
static unsigned char current_commit_sha1[20];
static const char commitS[] = "commit";
static const char treeS[] = "tree";
static const char blobS[] = "blob";
void pull_say(const char *fmt, const char *hex) {
if (get_verbosely)
fprintf(stderr, fmt, hex);
}
static void report_missing(const char *what, const unsigned char *missing)
{
char missing_hex[41];
strcpy(missing_hex, sha1_to_hex(missing));;
fprintf(stderr,
"Cannot obtain needed %s %s\nwhile processing commit %s.\n",
what, missing_hex, sha1_to_hex(current_commit_sha1));
}
static int make_sure_we_have_it(const char *what, unsigned char *sha1)
{
int status = 0;
if (!has_sha1_file(sha1)) {
status = fetch(sha1);
if (status && what)
report_missing(what, sha1);
}
else if (get_delta < 2)
return 0;
if (get_delta) {
unsigned char delta_sha1[20];
status = sha1_delta_base(sha1, delta_sha1);
if (0 < status)
status = make_sure_we_have_it(what, delta_sha1);
}
return status;
}
static int process_unknown(unsigned char *sha1);
static int process_tree(unsigned char *sha1)
{
struct tree *tree = lookup_tree(sha1);
struct tree_entry_list *entries;
if (parse_tree(tree))
return -1;
for (entries = tree->entries; entries; entries = entries->next) {
const char *what = entries->directory ? treeS : blobS;
if (make_sure_we_have_it(what, entries->item.tree->object.sha1))
return -1;
if (entries->directory) {
if (process_tree(entries->item.tree->object.sha1))
return -1;
}
}
return 0;
}
static int process_commit(unsigned char *sha1)
{
struct commit *obj = lookup_commit(sha1);
if (make_sure_we_have_it(commitS, sha1))
return -1;
if (parse_commit(obj))
return -1;
if (get_tree) {
if (make_sure_we_have_it(treeS, obj->tree->object.sha1))
return -1;
if (process_tree(obj->tree->object.sha1))
return -1;
if (!get_all)
get_tree = 0;
}
if (get_history) {
struct commit_list *parents = obj->parents;
for (; parents; parents = parents->next) {
if (has_sha1_file(parents->item->object.sha1))
continue;
if (make_sure_we_have_it(NULL,
parents->item->object.sha1)) {
/* The server might not have it, and
* we don't mind.
*/
continue;
}
if (process_commit(parents->item->object.sha1))
return -1;
memcpy(current_commit_sha1, sha1, 20);
}
}
return 0;
}
static int process_tag(unsigned char *sha1)
{
struct tag *obj = lookup_tag(sha1);
if (parse_tag(obj))
return -1;
return process_unknown(obj->tagged->sha1);
}
static int process_unknown(unsigned char *sha1)
{
struct object *obj;
if (make_sure_we_have_it("object", sha1))
return -1;
obj = parse_object(sha1);
if (!obj)
return error("Unable to parse object %s", sha1_to_hex(sha1));
if (obj->type == commit_type)
return process_commit(sha1);
if (obj->type == tree_type)
return process_tree(sha1);
if (obj->type == blob_type)
return 0;
if (obj->type == tag_type)
return process_tag(sha1);
return error("Unable to determine requirement of type %s for %s",
obj->type, sha1_to_hex(sha1));
}
static int interpret_target(char *target, unsigned char *sha1)
{
if (!get_sha1_hex(target, sha1))
return 0;
if (!check_ref_format(target)) {
if (!fetch_ref(target, sha1)) {
return 0;
}
}
return -1;
}
int pull(char *target)
{
unsigned char sha1[20];
int fd = -1;
if (write_ref && current_ref) {
fd = lock_ref_sha1(write_ref, current_ref);
if (fd < 0)
return -1;
}
if (interpret_target(target, sha1))
return error("Could not interpret %s as something to pull",
target);
if (process_unknown(sha1))
return -1;
if (write_ref) {
if (current_ref) {
write_ref_sha1(write_ref, fd, sha1);
} else {
write_ref_sha1_unlocked(write_ref, sha1);
}
}
return 0;
}
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