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builtin/clone.c: add --reject-shallow option

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In some scenarios, users may want more history than the repository
offered for cloning, which happens to be a shallow repository, can
give them. But because users don't know it is a shallow repository
until they download it to local, we may want to refuse to clone
this kind of repository, without creating any unnecessary files.

The '--depth=x' option cannot be used as a solution; the source may
be deep enough to give us 'x' commits when cloned, but the user may
later need to deepen the history to arbitrary depth.

Teach '--reject-shallow' option to "git clone" to abort as soon as
we find out that we are cloning from a shallow repository.

Signed-off-by: Li Linchao <lilinchao@oschina.cn>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Li Linchao
2021-04-01 10:46:59 +00:00
committed by Junio C Hamano
parent 84d06cdc06
commit 4fe788b1b0
10 changed files with 108 additions and 6 deletions
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4
transport.h
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@@ -14,6 +14,7 @@ struct git_transport_options {
unsigned check_self_contained_and_connected : 1;
unsigned self_contained_and_connected : 1;
unsigned update_shallow : 1;
unsigned reject_shallow : 1;
unsigned deepen_relative : 1;
/* see documentation of corresponding flag in fetch-pack.h */
@@ -194,6 +195,9 @@ void transport_check_allowed(const char *type);
/* Aggressively fetch annotated tags if possible */
#define TRANS_OPT_FOLLOWTAGS "followtags"
/* Reject shallow repo transport */
#define TRANS_OPT_REJECT_SHALLOW "rejectshallow"
/* Accept refs that may update .git/shallow without --depth */
#define TRANS_OPT_UPDATE_SHALLOW "updateshallow"