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https://github.com/git/git
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cd541a68b3
This adds support to pull.c for requesting a reference and writing it to a file. All of the git-*-pull programs get stubs for now. Signed-off-by: Linus Torvalds <torvalds@osdl.org>
157 lines
3.2 KiB
C
157 lines
3.2 KiB
C
#include "pull.h"
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#include "cache.h"
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#include "commit.h"
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#include "tree.h"
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#include "refs.h"
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const char *write_ref = NULL;
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const unsigned char *current_ref = NULL;
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int get_tree = 0;
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int get_history = 0;
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/* 1 means "get delta", 2 means "really check delta harder */
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int get_delta = 1;
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int get_all = 0;
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int get_verbosely = 0;
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static unsigned char current_commit_sha1[20];
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static const char commitS[] = "commit";
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static const char treeS[] = "tree";
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static const char blobS[] = "blob";
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void pull_say(const char *fmt, const char *hex) {
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if (get_verbosely)
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fprintf(stderr, fmt, hex);
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}
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static void report_missing(const char *what, const unsigned char *missing)
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{
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char missing_hex[41];
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strcpy(missing_hex, sha1_to_hex(missing));;
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fprintf(stderr,
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"Cannot obtain needed %s %s\nwhile processing commit %s.\n",
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what, missing_hex, sha1_to_hex(current_commit_sha1));
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}
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static int make_sure_we_have_it(const char *what, unsigned char *sha1)
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{
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int status = 0;
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if (!has_sha1_file(sha1)) {
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status = fetch(sha1);
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if (status && what)
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report_missing(what, sha1);
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}
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else if (get_delta < 2)
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return 0;
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if (get_delta) {
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char delta_sha1[20];
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status = sha1_delta_base(sha1, delta_sha1);
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if (0 < status)
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status = make_sure_we_have_it(what, delta_sha1);
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}
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return status;
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}
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static int process_tree(unsigned char *sha1)
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{
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struct tree *tree = lookup_tree(sha1);
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struct tree_entry_list *entries;
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if (parse_tree(tree))
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return -1;
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for (entries = tree->entries; entries; entries = entries->next) {
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const char *what = entries->directory ? treeS : blobS;
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if (make_sure_we_have_it(what, entries->item.tree->object.sha1))
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return -1;
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if (entries->directory) {
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if (process_tree(entries->item.tree->object.sha1))
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return -1;
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}
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}
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return 0;
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}
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static int process_commit(unsigned char *sha1)
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{
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struct commit *obj = lookup_commit(sha1);
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if (make_sure_we_have_it(commitS, sha1))
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return -1;
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if (parse_commit(obj))
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return -1;
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if (get_tree) {
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if (make_sure_we_have_it(treeS, obj->tree->object.sha1))
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return -1;
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if (process_tree(obj->tree->object.sha1))
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return -1;
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if (!get_all)
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get_tree = 0;
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}
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if (get_history) {
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struct commit_list *parents = obj->parents;
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for (; parents; parents = parents->next) {
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if (has_sha1_file(parents->item->object.sha1))
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continue;
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if (make_sure_we_have_it(NULL,
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parents->item->object.sha1)) {
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/* The server might not have it, and
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* we don't mind.
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*/
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continue;
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}
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if (process_commit(parents->item->object.sha1))
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return -1;
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memcpy(current_commit_sha1, sha1, 20);
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}
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}
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return 0;
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}
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static int interpret_target(char *target, unsigned char *sha1)
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{
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if (!get_sha1_hex(target, sha1))
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return 0;
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if (!check_ref_format(target)) {
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if (!fetch_ref(target, sha1)) {
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return 0;
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}
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}
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return -1;
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}
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int pull(char *target)
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{
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unsigned char sha1[20];
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int fd = -1;
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if (write_ref && current_ref) {
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fd = lock_ref_sha1(write_ref, current_ref);
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if (fd < 0)
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return -1;
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}
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if (interpret_target(target, sha1))
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return error("Could not interpret %s as something to pull",
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target);
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if (process_commit(sha1))
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return -1;
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if (write_ref) {
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if (current_ref) {
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write_ref_sha1(write_ref, fd, sha1);
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} else {
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write_ref_sha1_unlocked(write_ref, sha1);
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}
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}
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return 0;
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}
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