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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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8
commit.h
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@ -97,7 +97,7 @@ void sort_in_topological_order_fn(struct commit_list ** list, int lifo,
struct commit_graft {
unsigned char sha1[20];
int nr_parent;
int nr_parent; /* < 0 if shallow commit */
unsigned char parent[FLEX_ARRAY][20]; /* more */
};
@ -107,4 +107,10 @@ int read_graft_file(const char *graft_file);
extern struct commit_list *get_merge_bases(struct commit *rev1, struct commit *rev2, int cleanup);
extern int register_shallow(const unsigned char *sha1);
extern int write_shallow_commits(int fd, int use_pack_protocol);
extern int is_repository_shallow();
extern struct commit_list *get_shallow_commits(struct object_array *heads,
int depth);
#endif /* COMMIT_H */