git/t/t0410-partial-clone.sh
Jonathan Tan 498f1f61f1 fsck: introduce partialclone extension
Currently, Git does not support repos with very large numbers of objects
or repos that wish to minimize manipulation of certain blobs (for
example, because they are very large) very well, even if the user
operates mostly on part of the repo, because Git is designed on the
assumption that every referenced object is available somewhere in the
repo storage. In such an arrangement, the full set of objects is usually
available in remote storage, ready to be lazily downloaded.

Teach fsck about the new state of affairs. In this commit, teach fsck
that missing promisor objects referenced from the reflog are not an
error case; in future commits, fsck will be taught about other cases.

Signed-off-by: Jonathan Tan <jonathantanmy@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2017-12-05 09:46:05 -08:00

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#!/bin/sh
test_description='partial clone'
. ./test-lib.sh
delete_object () {
rm $1/.git/objects/$(echo $2 | sed -e 's|^..|&/|')
}
pack_as_from_promisor () {
HASH=$(git -C repo pack-objects .git/objects/pack/pack) &&
>repo/.git/objects/pack/pack-$HASH.promisor
}
test_expect_success 'missing reflog object, but promised by a commit, passes fsck' '
test_create_repo repo &&
test_commit -C repo my_commit &&
A=$(git -C repo commit-tree -m a HEAD^{tree}) &&
C=$(git -C repo commit-tree -m c -p $A HEAD^{tree}) &&
# Reference $A only from reflog, and delete it
git -C repo branch my_branch "$A" &&
git -C repo branch -f my_branch my_commit &&
delete_object repo "$A" &&
# State that we got $C, which refers to $A, from promisor
printf "$C\n" | pack_as_from_promisor &&
# Normally, it fails
test_must_fail git -C repo fsck &&
# But with the extension, it succeeds
git -C repo config core.repositoryformatversion 1 &&
git -C repo config extensions.partialclone "arbitrary string" &&
git -C repo fsck
'
test_expect_success 'missing reflog object, but promised by a tag, passes fsck' '
rm -rf repo &&
test_create_repo repo &&
test_commit -C repo my_commit &&
A=$(git -C repo commit-tree -m a HEAD^{tree}) &&
git -C repo tag -a -m d my_tag_name $A &&
T=$(git -C repo rev-parse my_tag_name) &&
git -C repo tag -d my_tag_name &&
# Reference $A only from reflog, and delete it
git -C repo branch my_branch "$A" &&
git -C repo branch -f my_branch my_commit &&
delete_object repo "$A" &&
# State that we got $T, which refers to $A, from promisor
printf "$T\n" | pack_as_from_promisor &&
git -C repo config core.repositoryformatversion 1 &&
git -C repo config extensions.partialclone "arbitrary string" &&
git -C repo fsck
'
test_expect_success 'missing reflog object alone fails fsck, even with extension set' '
rm -rf repo &&
test_create_repo repo &&
test_commit -C repo my_commit &&
A=$(git -C repo commit-tree -m a HEAD^{tree}) &&
B=$(git -C repo commit-tree -m b HEAD^{tree}) &&
# Reference $A only from reflog, and delete it
git -C repo branch my_branch "$A" &&
git -C repo branch -f my_branch my_commit &&
delete_object repo "$A" &&
git -C repo config core.repositoryformatversion 1 &&
git -C repo config extensions.partialclone "arbitrary string" &&
test_must_fail git -C repo fsck
'
test_done