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git/t/t6050-replace.sh
Jeff King da4398d6a0 add core.usereplacerefs config option 
We can already disable replace refs using a command line
option or environment variable, but those are awkward to
apply universally. Let's add a config option to do the same
thing.

That raises the question of why one might want to do so
universally. The answer is that replace refs violate the
immutability of objects. For instance, if you wanted to
cache the diff between commit XYZ and its parent, then in
theory that never changes; the hash XYZ represents the total
state. But replace refs violate that; pushing up a new ref
may create a completely new diff.

The obvious "if it hurts, don't do it" answer is not to
create replace refs if you're doing this kind of caching.
But for a site hosting arbitrary repositories, they may want
to allow users to share replace refs with each other, but
not actually respect them on the site (because the caching
is more important than the replace feature).

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2018-07-18 15:45:27 -07:00

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#!/bin/sh
#
# Copyright (c) 2008 Christian Couder
#
test_description='Tests replace refs functionality'
. ./test-lib.sh
. "$TEST_DIRECTORY/lib-gpg.sh"
add_and_commit_file ()
{
_file="$1"
_msg="$2"
git add $_file || return $?
test_tick || return $?
git commit --quiet -m "$_file: $_msg"
}
commit_buffer_contains_parents ()
{
git cat-file commit "$1" >payload &&
sed -n -e '/^$/q' -e '/^parent /p' <payload >actual &&
shift &&
for _parent
do
echo "parent $_parent"
done >expected &&
test_cmp expected actual
}
commit_peeling_shows_parents ()
{
_parent_number=1
_commit="$1"
shift &&
for _parent
do
_found=$(git rev-parse --verify $_commit^$_parent_number) || return 1
test "$_found" = "$_parent" || return 1
_parent_number=$(( $_parent_number + 1 ))
done &&
test_must_fail git rev-parse --verify $_commit^$_parent_number
}
commit_has_parents ()
{
commit_buffer_contains_parents "$@" &&
commit_peeling_shows_parents "$@"
}
HASH1=
HASH2=
HASH3=
HASH4=
HASH5=
HASH6=
HASH7=
test_expect_success 'set up buggy branch' '
echo "line 1" >>hello &&
echo "line 2" >>hello &&
echo "line 3" >>hello &&
echo "line 4" >>hello &&
add_and_commit_file hello "4 lines" &&
HASH1=$(git rev-parse --verify HEAD) &&
echo "line BUG" >>hello &&
echo "line 6" >>hello &&
echo "line 7" >>hello &&
echo "line 8" >>hello &&
add_and_commit_file hello "4 more lines with a BUG" &&
HASH2=$(git rev-parse --verify HEAD) &&
echo "line 9" >>hello &&
echo "line 10" >>hello &&
add_and_commit_file hello "2 more lines" &&
HASH3=$(git rev-parse --verify HEAD) &&
echo "line 11" >>hello &&
add_and_commit_file hello "1 more line" &&
HASH4=$(git rev-parse --verify HEAD) &&
sed -e "s/BUG/5/" hello >hello.new &&
mv hello.new hello &&
add_and_commit_file hello "BUG fixed" &&
HASH5=$(git rev-parse --verify HEAD) &&
echo "line 12" >>hello &&
echo "line 13" >>hello &&
add_and_commit_file hello "2 more lines" &&
HASH6=$(git rev-parse --verify HEAD) &&
echo "line 14" >>hello &&
echo "line 15" >>hello &&
echo "line 16" >>hello &&
add_and_commit_file hello "again 3 more lines" &&
HASH7=$(git rev-parse --verify HEAD)
'
test_expect_success 'replace the author' '
git cat-file commit $HASH2 | grep "author A U Thor" &&
R=$(git cat-file commit $HASH2 | sed -e "s/A U/O/" | git hash-object -t commit --stdin -w) &&
git cat-file commit $R | grep "author O Thor" &&
git update-ref refs/replace/$HASH2 $R &&
git show HEAD~5 | grep "O Thor" &&
git show $HASH2 | grep "O Thor"
'
test_expect_success 'test --no-replace-objects option' '
git cat-file commit $HASH2 | grep "author O Thor" &&
git --no-replace-objects cat-file commit $HASH2 | grep "author A U Thor" &&
git show $HASH2 | grep "O Thor" &&
git --no-replace-objects show $HASH2 | grep "A U Thor"
'
test_expect_success 'test GIT_NO_REPLACE_OBJECTS env variable' '
GIT_NO_REPLACE_OBJECTS=1 git cat-file commit $HASH2 | grep "author A U Thor" &&
GIT_NO_REPLACE_OBJECTS=1 git show $HASH2 | grep "A U Thor"
'
test_expect_success 'test core.usereplacerefs config option' '
test_config core.usereplacerefs false &&
git cat-file commit $HASH2 | grep "author A U Thor" &&
git show $HASH2 | grep "A U Thor"
'
cat >tag.sig <<EOF
object $HASH2
type commit
tag mytag
tagger T A Gger <> 0 +0000
EOF
test_expect_success 'tag replaced commit' '
git mktag <tag.sig >.git/refs/tags/mytag 2>message
'
test_expect_success '"git fsck" works' '
git fsck master >fsck_master.out &&
grep "dangling commit $R" fsck_master.out &&
grep "dangling tag $(cat .git/refs/tags/mytag)" fsck_master.out &&
test -z "$(git fsck)"
'
test_expect_success 'repack, clone and fetch work' '
git repack -a -d &&
git clone --no-hardlinks . clone_dir &&
(
cd clone_dir &&
git show HEAD~5 | grep "A U Thor" &&
git show $HASH2 | grep "A U Thor" &&
git cat-file commit $R &&
git repack -a -d &&
test_must_fail git cat-file commit $R &&
git fetch ../ "refs/replace/*:refs/replace/*" &&
git show HEAD~5 | grep "O Thor" &&
git show $HASH2 | grep "O Thor" &&
git cat-file commit $R
)
'
test_expect_success '"git replace" listing and deleting' '
test "$HASH2" = "$(git replace -l)" &&
test "$HASH2" = "$(git replace)" &&
aa=${HASH2%??????????????????????????????????????} &&
test "$HASH2" = "$(git replace --list "$aa*")" &&
test_must_fail git replace -d $R &&
test_must_fail git replace --delete &&
test_must_fail git replace -l -d $HASH2 &&
git replace -d $HASH2 &&
git show $HASH2 | grep "A U Thor" &&
test -z "$(git replace -l)"
'
test_expect_success '"git replace" replacing' '
git replace $HASH2 $R &&
git show $HASH2 | grep "O Thor" &&
test_must_fail git replace $HASH2 $R &&
git replace -f $HASH2 $R &&
test_must_fail git replace -f &&
test "$HASH2" = "$(git replace)"
'
test_expect_success '"git replace" resolves sha1' '
SHORTHASH2=$(git rev-parse --short=8 $HASH2) &&
git replace -d $SHORTHASH2 &&
git replace $SHORTHASH2 $R &&
git show $HASH2 | grep "O Thor" &&
test_must_fail git replace $HASH2 $R &&
git replace -f $HASH2 $R &&
test_must_fail git replace --force &&
test "$HASH2" = "$(git replace)"
'
# This creates a side branch where the bug in H2
# does not appear because P2 is created by applying
# H2 and squashing H5 into it.
# P3, P4 and P6 are created by cherry-picking H3, H4
# and H6 respectively.
#
# At this point, we should have the following:
#
# P2--P3--P4--P6
# /
# H1-H2-H3-H4-H5-H6-H7
#
# Then we replace H6 with P6.
#
test_expect_success 'create parallel branch without the bug' '
git replace -d $HASH2 &&
git show $HASH2 | grep "A U Thor" &&
git checkout $HASH1 &&
git cherry-pick $HASH2 &&
git show $HASH5 | git apply &&
git commit --amend -m "hello: 4 more lines WITHOUT the bug" hello &&
PARA2=$(git rev-parse --verify HEAD) &&
git cherry-pick $HASH3 &&
PARA3=$(git rev-parse --verify HEAD) &&
git cherry-pick $HASH4 &&
PARA4=$(git rev-parse --verify HEAD) &&
git cherry-pick $HASH6 &&
PARA6=$(git rev-parse --verify HEAD) &&
git replace $HASH6 $PARA6 &&
git checkout master &&
cur=$(git rev-parse --verify HEAD) &&
test "$cur" = "$HASH7" &&
git log --pretty=oneline | grep $PARA2 &&
git remote add cloned ./clone_dir
'
test_expect_success 'push to cloned repo' '
git push cloned $HASH6^:refs/heads/parallel &&
(
cd clone_dir &&
git checkout parallel &&
git log --pretty=oneline | grep $PARA2
)
'
test_expect_success 'push branch with replacement' '
git cat-file commit $PARA3 | grep "author A U Thor" &&
S=$(git cat-file commit $PARA3 | sed -e "s/A U/O/" | git hash-object -t commit --stdin -w) &&
git cat-file commit $S | grep "author O Thor" &&
git replace $PARA3 $S &&
git show $HASH6~2 | grep "O Thor" &&
git show $PARA3 | grep "O Thor" &&
git push cloned $HASH6^:refs/heads/parallel2 &&
(
cd clone_dir &&
git checkout parallel2 &&
git log --pretty=oneline | grep $PARA3 &&
git show $PARA3 | grep "A U Thor"
)
'
test_expect_success 'fetch branch with replacement' '
git branch tofetch $HASH6 &&
(
cd clone_dir &&
git fetch origin refs/heads/tofetch:refs/heads/parallel3 &&
git log --pretty=oneline parallel3 >output.txt &&
! grep $PARA3 output.txt &&
git show $PARA3 >para3.txt &&
grep "A U Thor" para3.txt &&
git fetch origin "refs/replace/*:refs/replace/*" &&
git log --pretty=oneline parallel3 >output.txt &&
grep $PARA3 output.txt &&
git show $PARA3 >para3.txt &&
grep "O Thor" para3.txt
)
'
test_expect_success 'bisect and replacements' '
git bisect start $HASH7 $HASH1 &&
test "$PARA3" = "$(git rev-parse --verify HEAD)" &&
git bisect reset &&
GIT_NO_REPLACE_OBJECTS=1 git bisect start $HASH7 $HASH1 &&
test "$HASH4" = "$(git rev-parse --verify HEAD)" &&
git bisect reset &&
git --no-replace-objects bisect start $HASH7 $HASH1 &&
test "$HASH4" = "$(git rev-parse --verify HEAD)" &&
git bisect reset
'
test_expect_success 'index-pack and replacements' '
git --no-replace-objects rev-list --objects HEAD |
git --no-replace-objects pack-objects test- &&
git index-pack test-*.pack
'
test_expect_success 'not just commits' '
echo replaced >file &&
git add file &&
REPLACED=$(git rev-parse :file) &&
mv file file.replaced &&
echo original >file &&
git add file &&
ORIGINAL=$(git rev-parse :file) &&
git update-ref refs/replace/$ORIGINAL $REPLACED &&
mv file file.original &&
git checkout file &&
test_cmp file.replaced file
'
test_expect_success 'replaced and replacement objects must be of the same type' '
test_must_fail git replace mytag $HASH1 &&
test_must_fail git replace HEAD^{tree} HEAD~1 &&
BLOB=$(git rev-parse :file) &&
test_must_fail git replace HEAD^ $BLOB
'
test_expect_success '-f option bypasses the type check' '
git replace -f mytag $HASH1 &&
git replace --force HEAD^{tree} HEAD~1 &&
git replace -f HEAD^ $BLOB
'
test_expect_success 'git cat-file --batch works on replace objects' '
git replace | grep $PARA3 &&
echo $PARA3 | git cat-file --batch
'
test_expect_success 'test --format bogus' '
test_must_fail git replace --format bogus >/dev/null 2>&1
'
test_expect_success 'test --format short' '
git replace --format=short >actual &&
git replace >expected &&
test_cmp expected actual
'
test_expect_success 'test --format medium' '
H1=$(git --no-replace-objects rev-parse HEAD~1) &&
HT=$(git --no-replace-objects rev-parse HEAD^{tree}) &&
MYTAG=$(git --no-replace-objects rev-parse mytag) &&
{
echo "$H1 -> $BLOB" &&
echo "$BLOB -> $REPLACED" &&
echo "$HT -> $H1" &&
echo "$PARA3 -> $S" &&
echo "$MYTAG -> $HASH1"
} | sort >expected &&
git replace -l --format medium | sort >actual &&
test_cmp expected actual
'
test_expect_success 'test --format long' '
{
echo "$H1 (commit) -> $BLOB (blob)" &&
echo "$BLOB (blob) -> $REPLACED (blob)" &&
echo "$HT (tree) -> $H1 (commit)" &&
echo "$PARA3 (commit) -> $S (commit)" &&
echo "$MYTAG (tag) -> $HASH1 (commit)"
} | sort >expected &&
git replace --format=long | sort >actual &&
test_cmp expected actual
'
test_expect_success 'setup fake editors' '
write_script fakeeditor <<-\EOF &&
sed -e "s/A U Thor/A fake Thor/" "$1" >"$1.new"
mv "$1.new" "$1"
EOF
write_script failingfakeeditor <<-\EOF
./fakeeditor "$@"
false
EOF
'
test_expect_success '--edit with and without already replaced object' '
test_must_fail env GIT_EDITOR=./fakeeditor git replace --edit "$PARA3" &&
GIT_EDITOR=./fakeeditor git replace --force --edit "$PARA3" &&
git replace -l | grep "$PARA3" &&
git cat-file commit "$PARA3" | grep "A fake Thor" &&
git replace -d "$PARA3" &&
GIT_EDITOR=./fakeeditor git replace --edit "$PARA3" &&
git replace -l | grep "$PARA3" &&
git cat-file commit "$PARA3" | grep "A fake Thor"
'
test_expect_success '--edit and change nothing or command failed' '
git replace -d "$PARA3" &&
test_must_fail env GIT_EDITOR=true git replace --edit "$PARA3" &&
test_must_fail env GIT_EDITOR="./failingfakeeditor" git replace --edit "$PARA3" &&
GIT_EDITOR=./fakeeditor git replace --edit "$PARA3" &&
git replace -l | grep "$PARA3" &&
git cat-file commit "$PARA3" | grep "A fake Thor"
'
test_expect_success 'replace ref cleanup' '
test -n "$(git replace)" &&
git replace -d $(git replace) &&
test -z "$(git replace)"
'
test_expect_success '--graft with and without already replaced object' '
test $(git log --oneline | wc -l) = 7 &&
git replace --graft $HASH5 &&
test $(git log --oneline | wc -l) = 3 &&
commit_has_parents $HASH5 &&
test_must_fail git replace --graft $HASH5 $HASH4 $HASH3 &&
git replace --force -g $HASH5 $HASH4 $HASH3 &&
commit_has_parents $HASH5 $HASH4 $HASH3 &&
git replace -d $HASH5
'
test_expect_success GPG 'set up a signed commit' '
echo "line 17" >>hello &&
echo "line 18" >>hello &&
git add hello &&
test_tick &&
git commit --quiet -S -m "hello: 2 more lines in a signed commit" &&
HASH8=$(git rev-parse --verify HEAD) &&
git verify-commit $HASH8
'
test_expect_success GPG '--graft with a signed commit' '
git cat-file commit $HASH8 >orig &&
git replace --graft $HASH8 &&
git cat-file commit $HASH8 >repl &&
commit_has_parents $HASH8 &&
test_must_fail git verify-commit $HASH8 &&
sed -n -e "/^tree /p" -e "/^author /p" -e "/^committer /p" orig >expected &&
echo >>expected &&
sed -e "/^$/q" repl >actual &&
test_cmp expected actual &&
git replace -d $HASH8
'
test_expect_success GPG 'set up a merge commit with a mergetag' '
git reset --hard HEAD &&
git checkout -b test_branch HEAD~2 &&
echo "line 1 from test branch" >>hello &&
echo "line 2 from test branch" >>hello &&
git add hello &&
test_tick &&
git commit -m "hello: 2 more lines from a test branch" &&
HASH9=$(git rev-parse --verify HEAD) &&
git tag -s -m "tag for testing with a mergetag" test_tag HEAD &&
git checkout master &&
git merge -s ours test_tag &&
HASH10=$(git rev-parse --verify HEAD) &&
git cat-file commit $HASH10 | grep "^mergetag object"
'
test_expect_success GPG '--graft on a commit with a mergetag' '
test_must_fail git replace --graft $HASH10 $HASH8^1 &&
git replace --graft $HASH10 $HASH8^1 $HASH9 &&
git replace -d $HASH10
'
test_expect_success '--convert-graft-file' '
git checkout -b with-graft-file &&
test_commit root2 &&
git reset --hard root2^ &&
test_commit root1 &&
test_commit after-root1 &&
test_tick &&
git merge -m merge-root2 root2 &&
: add and convert graft file &&
printf "%s\n%s %s\n\n# comment\n%s\n" \
$(git rev-parse HEAD^^ HEAD^ HEAD^^ HEAD^2) \
>.git/info/grafts &&
git replace --convert-graft-file &&
test_path_is_missing .git/info/grafts &&
: verify that the history is now "grafted" &&
git rev-list HEAD >out &&
test_line_count = 4 out &&
: create invalid graft file and verify that it is not deleted &&
test_when_finished "rm -f .git/info/grafts" &&
echo $EMPTY_BLOB $EMPTY_TREE >.git/info/grafts &&
test_must_fail git replace --convert-graft-file 2>err &&
test_i18ngrep "$EMPTY_BLOB $EMPTY_TREE" err &&
test_i18ngrep "$EMPTY_BLOB $EMPTY_TREE" .git/info/grafts
'
test_done
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