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https://github.com/git/git.git
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4a62b61939
When a remote repository is deltified, we need to get the objects that a deltified object we want to obtain is based upon. The initial parts of each retrieved SHA1 file is inflated and inspected to see if it is deltified, and its base object is asked from the remote side when it is. Since this partial inflation and inspection has a small performance hit, it can optionally be skipped by giving -d flag to git-*-pull commands. This flag should be used only when the remote repository is known to have no deltified objects. Rsync transport does not have this problem since it fetches everything the remote side has. Signed-off-by: Junio C Hamano <junkio@cox.net> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
121 lines
2.6 KiB
C
121 lines
2.6 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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int get_tree = 0;
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int get_history = 0;
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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;
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if (has_sha1_file(sha1))
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return 0;
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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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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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int pull(char *target)
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{
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int retval;
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unsigned char sha1[20];
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retval = get_sha1_hex(target, sha1);
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if (retval)
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return retval;
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retval = make_sure_we_have_it(commitS, sha1);
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if (retval)
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return retval;
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memcpy(current_commit_sha1, sha1, 20);
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return process_commit(sha1);
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}
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