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support fetching into a shallow repository

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A shallow commit is a commit which has parents, which in turn are
"grafted away", i.e. the commit appears as if it were a root.

Since these shallow commits should not be edited by the user, but
only by core git, they are recorded in the file $GIT_DIR/shallow.

A repository containing shallow commits is called shallow.

The advantage of a shallow repository is that even if the upstream
contains lots of history, your local (shallow) repository needs not
occupy much disk space.

The disadvantage is that you might miss a merge base when pulling
some remote branch.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <junkio@cox.net>
This commit is contained in:
Johannes Schindelin
2006-10-30 20:09:06 +01:00
committed by Junio C Hamano
parent 9b8dc263e1
commit ed09aef06f
6 changed files with 150 additions and 4 deletions
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97
shallow.c Normal file
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#include "cache.h"
#include "commit.h"
static int is_shallow = -1;
int register_shallow(const unsigned char *sha1)
{
struct commit_graft *graft =
xmalloc(sizeof(struct commit_graft));
struct commit *commit = lookup_commit(sha1);
hashcpy(graft->sha1, sha1);
graft->nr_parent = -1;
if (commit && commit->object.parsed)
commit->parents = NULL;
return register_commit_graft(graft, 0);
}
int is_repository_shallow()
{
FILE *fp;
char buf[1024];
if (is_shallow >= 0)
return is_shallow;
fp = fopen(git_path("shallow"), "r");
if (!fp) {
is_shallow = 0;
return is_shallow;
}
is_shallow = 1;
while (fgets(buf, sizeof(buf), fp)) {
unsigned char sha1[20];
if (get_sha1_hex(buf, sha1))
die("bad shallow line: %s", buf);
register_shallow(sha1);
}
fclose(fp);
return is_shallow;
}
struct commit_list *get_shallow_commits(struct object_array *heads, int depth)
{
int i = 0, cur_depth = 0;
struct commit_list *result = NULL;
struct object_array stack = {0, 0, NULL};
struct commit *commit = NULL;
while (commit || i < heads->nr || stack.nr) {
struct commit_list *p;
if (!commit) {
if (i < heads->nr) {
commit = (struct commit *)
heads->objects[i++].item;
if (commit->object.type != OBJ_COMMIT) {
commit = NULL;
continue;
}
commit->util = xcalloc(1, sizeof(int));
cur_depth = 0;
} else {
commit = (struct commit *)
stack.objects[--stack.nr].item;
cur_depth = *(int *)commit->util;
}
}
parse_commit(commit);
cur_depth++;
for (p = commit->parents, commit = NULL; p; p = p->next) {
if (!p->item->util) {
int *pointer = xmalloc(sizeof(int));
p->item->util = pointer;
*pointer = cur_depth;
} else {
int *pointer = p->item->util;
if (cur_depth >= *pointer)
continue;
*pointer = cur_depth;
}
if (cur_depth < depth) {
if (p->next)
add_object_array(&p->item->object,
NULL, &stack);
else {
commit = p->item;
cur_depth = *(int *)commit->util;
}
} else
commit_list_insert(p->item, &result);
}
}
return result;
}