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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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25
t/t5611-clone-config.sh
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@ -95,6 +95,31 @@ test_expect_success 'clone -c remote.<remote>.fetch=<refspec> --origin=<name>' '
test_cmp expect actual
'
test_expect_success 'set up shallow repository' '
git clone --depth=1 --no-local . shallow-repo
'
test_expect_success 'clone.rejectshallow=true should reject cloning shallow repo' '
test_when_finished "rm -rf out" &&
test_must_fail git -c clone.rejectshallow=true clone --no-local shallow-repo out 2>err &&
test_i18ngrep -e "source repository is shallow, reject to clone." err &&
git -c clone.rejectshallow=false clone --no-local shallow-repo out
'
test_expect_success 'option --[no-]reject-shallow override clone.rejectshallow config' '
test_when_finished "rm -rf out" &&
test_must_fail git -c clone.rejectshallow=false clone --reject-shallow --no-local shallow-repo out 2>err &&
test_i18ngrep -e "source repository is shallow, reject to clone." err &&
git -c clone.rejectshallow=true clone --no-reject-shallow --no-local shallow-repo out
'
test_expect_success 'clone.rejectshallow=true should succeed cloning normal repo' '
test_when_finished "rm -rf out" &&
git -c clone.rejectshallow=true clone --no-local . out
'
test_expect_success MINGW 'clone -c core.hideDotFiles' '
test_commit attributes .gitattributes "" &&
rm -rf child &&