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git/t/t9350-fast-export.sh
William Sprent 726a228dfb fast-export: fix surprising behavior with --first-parent 
The revision traversal machinery typically processes and returns all
children before any parent.  fast-export needs to operate in the
reverse fashion, handling parents before any of their children in
order to build up the history starting from the root commit(s).  This
would be a clear case where we could just use the revision traversal
machinery's "reverse" option to achieve this desired affect.

However, this wasn't what the code did.  It added its own array for
queuing.  The obvious hand-rolled solution would be to just push all
the commits into the array and then traverse afterwards, but it didn't
quite do that either.  It instead attempted to process anything it
could as soon as it could, and once it could, check whether it could
process anything that had been queued.  As far as I can tell, this was
an effort to save a little memory in the case of multiple root commits
since it could process some commits before queueing all of them.  This
involved some helper functions named has_unshown_parent() and
handle_tail().  For typical invocations of fast-export, this
alternative essentially amounted to a hand-rolled method of reversing
the commits -- it was a bunch of work to duplicate the revision
traversal machinery's "reverse" option.

This hand-rolled reversing mechanism is actually somewhat difficult to
reason about.  It takes some time to figure out how it ensures in
normal cases that it will actually process all traversed commits
(rather than just dropping some and not printing anything for them).

And it turns out there are some cases where the code does drop commits
without handling them, and not even printing an error or warning for
the user.  Due to the has_unshown_parent() checks, some commits could
be left in the array at the end of the "while...get_revision()" loop
which would be unprocessed.  This could be triggered for example with
    git fast-export main -- --first-parent
or non-sensical traversal rules such as
    git fast-export main -- --grep=Merge --invert-grep

While most traversals that don't include all parents should likely
trigger errors in fast-export (or at least require being used in
combination with --reference-excluded-parents), the --first-parent
traversal is at least reasonable and it'd be nice if it didn't just drop
commits. It'd also be nice for future readers of the code to have a
simpler "reverse traversal" mechanism. Use the "reverse" option of the
revision traversal machinery to achieve both.

Even for the non-sensical traversal flags like the --grep one above,
this would be an improvement. For example, in that case, the code
previously would have silently truncated history to only those commits
that do not have an ancestor containing "Merge" in their commit message.
After this code change, that case would include all commits without
"Merge" in their commit message -- but any commit that previously had a
"Merge"-mentioning parent would lose that parent
(likely resulting in many new root commits). While the new behavior is
still odd, it is at least understandable given that
--reference-excluded-parents is not the default.

Helped-by: Elijah Newren <newren@gmail.com>
Signed-off-by: William Sprent <williams@unity3d.com>
Reviewed-by: Elijah Newren <newren@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2021-12-21 12:51:09 -08:00

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#!/bin/sh
#
# Copyright (c) 2007 Johannes E. Schindelin
#
test_description='git fast-export'
GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
. ./test-lib.sh
test_expect_success 'setup' '
echo break it > file0 &&
git add file0 &&
test_tick &&
echo Wohlauf > file &&
git add file &&
test_tick &&
git commit -m initial &&
echo die Luft > file &&
echo geht frisch > file2 &&
git add file file2 &&
test_tick &&
git commit -m second &&
echo und > file2 &&
test_tick &&
git commit -m third file2 &&
test_tick &&
git tag rein &&
git checkout -b wer HEAD^ &&
echo lange > file2 &&
test_tick &&
git commit -m sitzt file2 &&
test_tick &&
git tag -a -m valentin muss &&
git merge -s ours main
'
test_expect_success 'fast-export | fast-import' '
MAIN=$(git rev-parse --verify main) &&
REIN=$(git rev-parse --verify rein) &&
WER=$(git rev-parse --verify wer) &&
MUSS=$(git rev-parse --verify muss) &&
mkdir new &&
git --git-dir=new/.git init &&
git fast-export --all >actual &&
(cd new &&
git fast-import &&
test $MAIN = $(git rev-parse --verify refs/heads/main) &&
test $REIN = $(git rev-parse --verify refs/tags/rein) &&
test $WER = $(git rev-parse --verify refs/heads/wer) &&
test $MUSS = $(git rev-parse --verify refs/tags/muss)) <actual
'
test_expect_success 'fast-export ^muss^{commit} muss' '
git fast-export --tag-of-filtered-object=rewrite ^muss^{commit} muss >actual &&
cat >expected <<-EOF &&
tag muss
from $(git rev-parse --verify muss^{commit})
$(git cat-file tag muss | grep tagger)
data 9
valentin
EOF
test_cmp expected actual
'
test_expect_success 'fast-export --mark-tags ^muss^{commit} muss' '
git fast-export --mark-tags --tag-of-filtered-object=rewrite ^muss^{commit} muss >actual &&
cat >expected <<-EOF &&
tag muss
mark :1
from $(git rev-parse --verify muss^{commit})
$(git cat-file tag muss | grep tagger)
data 9
valentin
EOF
test_cmp expected actual
'
test_expect_success 'fast-export main~2..main' '
git fast-export main~2..main >actual &&
sed "s/main/partial/" actual |
(cd new &&
git fast-import &&
test $MAIN != $(git rev-parse --verify refs/heads/partial) &&
git diff --exit-code main partial &&
git diff --exit-code main^ partial^ &&
test_must_fail git rev-parse partial~2)
'
test_expect_success 'fast-export --reference-excluded-parents main~2..main' '
git fast-export --reference-excluded-parents main~2..main >actual &&
grep commit.refs/heads/main actual >commit-count &&
test_line_count = 2 commit-count &&
sed "s/main/rewrite/" actual |
(cd new &&
git fast-import &&
test $MAIN = $(git rev-parse --verify refs/heads/rewrite))
'
test_expect_success 'fast-export --show-original-ids' '
git fast-export --show-original-ids main >output &&
grep ^original-oid output| sed -e s/^original-oid.// | sort >actual &&
git rev-list --objects main muss >objects-and-names &&
awk "{print \$1}" objects-and-names | sort >commits-trees-blobs &&
comm -23 actual commits-trees-blobs >unfound &&
test_must_be_empty unfound
'
test_expect_success 'fast-export --show-original-ids | git fast-import' '
git fast-export --show-original-ids main muss | git fast-import --quiet &&
test $MAIN = $(git rev-parse --verify refs/heads/main) &&
test $MUSS = $(git rev-parse --verify refs/tags/muss)
'
test_expect_success 'reencoding iso-8859-7' '
test_when_finished "git reset --hard HEAD~1" &&
test_config i18n.commitencoding iso-8859-7 &&
test_tick &&
echo rosten >file &&
git commit -s -F "$TEST_DIRECTORY/t9350/simple-iso-8859-7-commit-message.txt" file &&
git fast-export --reencode=yes wer^..wer >iso-8859-7.fi &&
sed "s/wer/i18n/" iso-8859-7.fi |
(cd new &&
git fast-import &&
# The commit object, if not re-encoded, would be 200 bytes plus hash.
# Removing the "encoding iso-8859-7\n" header drops 20 bytes.
# Re-encoding the Pi character from \xF0 (\360) in iso-8859-7
# to \xCF\x80 (\317\200) in UTF-8 adds a byte. Check for
# the expected size.
test $(($(test_oid hexsz) + 181)) -eq "$(git cat-file -s i18n)" &&
# ...and for the expected translation of bytes.
git cat-file commit i18n >actual &&
grep $(printf "\317\200") actual &&
# Also make sure the commit does not have the "encoding" header
! grep ^encoding actual)
'
test_expect_success 'aborting on iso-8859-7' '
test_when_finished "git reset --hard HEAD~1" &&
test_config i18n.commitencoding iso-8859-7 &&
echo rosten >file &&
git commit -s -F "$TEST_DIRECTORY/t9350/simple-iso-8859-7-commit-message.txt" file &&
test_must_fail git fast-export --reencode=abort wer^..wer >iso-8859-7.fi
'
test_expect_success 'preserving iso-8859-7' '
test_when_finished "git reset --hard HEAD~1" &&
test_config i18n.commitencoding iso-8859-7 &&
echo rosten >file &&
git commit -s -F "$TEST_DIRECTORY/t9350/simple-iso-8859-7-commit-message.txt" file &&
git fast-export --reencode=no wer^..wer >iso-8859-7.fi &&
sed "s/wer/i18n-no-recoding/" iso-8859-7.fi |
(cd new &&
git fast-import &&
# The commit object, if not re-encoded, is 200 bytes plus hash.
# Removing the "encoding iso-8859-7\n" header would drops 20
# bytes. Re-encoding the Pi character from \xF0 (\360) in
# iso-8859-7 to \xCF\x80 (\317\200) in UTF-8 adds a byte.
# Check for the expected size...
test $(($(test_oid hexsz) + 200)) -eq "$(git cat-file -s i18n-no-recoding)" &&
# ...as well as the expected byte.
git cat-file commit i18n-no-recoding >actual &&
grep $(printf "\360") actual &&
# Also make sure the commit has the "encoding" header
grep ^encoding actual)
'
test_expect_success 'encoding preserved if reencoding fails' '
test_when_finished "git reset --hard HEAD~1" &&
test_config i18n.commitencoding iso-8859-7 &&
echo rosten >file &&
git commit -s -F "$TEST_DIRECTORY/t9350/broken-iso-8859-7-commit-message.txt" file &&
git fast-export --reencode=yes wer^..wer >iso-8859-7.fi &&
sed "s/wer/i18n-invalid/" iso-8859-7.fi |
(cd new &&
git fast-import &&
git cat-file commit i18n-invalid >actual &&
# Make sure the commit still has the encoding header
grep ^encoding actual &&
# Verify that the commit has the expected size; i.e.
# that no bytes were re-encoded to a different encoding.
test $(($(test_oid hexsz) + 212)) -eq "$(git cat-file -s i18n-invalid)" &&
# ...and check for the original special bytes
grep $(printf "\360") actual &&
grep $(printf "\377") actual)
'
test_expect_success 'import/export-marks' '
git checkout -b marks main &&
git fast-export --export-marks=tmp-marks HEAD &&
test -s tmp-marks &&
test_line_count = 3 tmp-marks &&
git fast-export --import-marks=tmp-marks \
--export-marks=tmp-marks HEAD >actual &&
test $(grep ^commit actual | wc -l) -eq 0 &&
echo change > file &&
git commit -m "last commit" file &&
git fast-export --import-marks=tmp-marks \
--export-marks=tmp-marks HEAD >actual &&
test $(grep ^commit\ actual | wc -l) -eq 1 &&
test_line_count = 4 tmp-marks
'
cat > signed-tag-import << EOF
tag sign-your-name
from $(git rev-parse HEAD)
tagger C O Mitter <committer@example.com> 1112911993 -0700
data 210
A message for a sign
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.5 (GNU/Linux)
fakedsignaturefakedsignaturefakedsignaturefakedsignaturfakedsign
aturefakedsignaturefake=
=/59v
-----END PGP SIGNATURE-----
EOF
test_expect_success 'set up faked signed tag' '
cat signed-tag-import | git fast-import
'
test_expect_success 'signed-tags=abort' '
test_must_fail git fast-export --signed-tags=abort sign-your-name
'
test_expect_success 'signed-tags=verbatim' '
git fast-export --signed-tags=verbatim sign-your-name > output &&
grep PGP output
'
test_expect_success 'signed-tags=strip' '
git fast-export --signed-tags=strip sign-your-name > output &&
! grep PGP output
'
test_expect_success 'signed-tags=warn-strip' '
git fast-export --signed-tags=warn-strip sign-your-name >output 2>err &&
! grep PGP output &&
test -s err
'
test_expect_success 'setup submodule' '
git checkout -f main &&
mkdir sub &&
(
cd sub &&
git init &&
echo test file > file &&
git add file &&
git commit -m sub_initial
) &&
git submodule add "$(pwd)/sub" sub &&
git commit -m initial &&
test_tick &&
(
cd sub &&
echo more data >> file &&
git add file &&
git commit -m sub_second
) &&
git add sub &&
git commit -m second
'
test_expect_success 'submodule fast-export | fast-import' '
SUBENT1=$(git ls-tree main^ sub) &&
SUBENT2=$(git ls-tree main sub) &&
rm -rf new &&
mkdir new &&
git --git-dir=new/.git init &&
git fast-export --signed-tags=strip --all >actual &&
(cd new &&
git fast-import &&
test "$SUBENT1" = "$(git ls-tree refs/heads/main^ sub)" &&
test "$SUBENT2" = "$(git ls-tree refs/heads/main sub)" &&
git checkout main &&
git submodule init &&
git submodule update &&
cmp sub/file ../sub/file) <actual
'
GIT_AUTHOR_NAME='A U Thor'; export GIT_AUTHOR_NAME
GIT_COMMITTER_NAME='C O Mitter'; export GIT_COMMITTER_NAME
test_expect_success 'setup copies' '
git checkout -b copy rein &&
git mv file file3 &&
git commit -m move1 &&
test_tick &&
cp file2 file4 &&
git add file4 &&
git mv file2 file5 &&
git commit -m copy1 &&
test_tick &&
cp file3 file6 &&
git add file6 &&
git commit -m copy2 &&
test_tick &&
echo more text >> file6 &&
echo even more text >> file6 &&
git add file6 &&
git commit -m modify &&
test_tick &&
cp file6 file7 &&
echo test >> file7 &&
git add file7 &&
git commit -m copy_modify
'
test_expect_success 'fast-export -C -C | fast-import' '
ENTRY=$(git rev-parse --verify copy) &&
rm -rf new &&
mkdir new &&
git --git-dir=new/.git init &&
git fast-export -C -C --signed-tags=strip --all > output &&
grep "^C file2 file4\$" output &&
cat output |
(cd new &&
git fast-import &&
test $ENTRY = $(git rev-parse --verify refs/heads/copy))
'
test_expect_success 'fast-export | fast-import when main is tagged' '
git tag -m msg last &&
git fast-export -C -C --signed-tags=strip --all > output &&
test $(grep -c "^tag " output) = 3
'
cat > tag-content << EOF
object $(git rev-parse HEAD)
type commit
tag rosten
EOF
test_expect_success 'cope with tagger-less tags' '
TAG=$(git hash-object -t tag -w tag-content) &&
git update-ref refs/tags/sonnenschein $TAG &&
git fast-export -C -C --signed-tags=strip --all > output &&
test $(grep -c "^tag " output) = 4 &&
! grep "Unspecified Tagger" output &&
git fast-export -C -C --signed-tags=strip --all \
--fake-missing-tagger > output &&
test $(grep -c "^tag " output) = 4 &&
grep "Unspecified Tagger" output
'
test_expect_success 'setup for limiting exports by PATH' '
mkdir limit-by-paths &&
(
cd limit-by-paths &&
git init &&
echo hi > there &&
git add there &&
git commit -m "First file" &&
echo foo > bar &&
git add bar &&
git commit -m "Second file" &&
git tag -a -m msg mytag &&
echo morefoo >> bar &&
git add bar &&
git commit -m "Change to second file"
)
'
cat > limit-by-paths/expected << EOF
blob
mark :1
data 3
hi
reset refs/tags/mytag
commit refs/tags/mytag
mark :2
author A U Thor <author@example.com> 1112912713 -0700
committer C O Mitter <committer@example.com> 1112912713 -0700
data 11
First file
M 100644 :1 there
EOF
test_expect_success 'dropping tag of filtered out object' '
(
cd limit-by-paths &&
git fast-export --tag-of-filtered-object=drop mytag -- there > output &&
test_cmp expected output
)
'
cat >> limit-by-paths/expected << EOF
tag mytag
from :2
tagger C O Mitter <committer@example.com> 1112912713 -0700
data 4
msg
EOF
test_expect_success 'rewriting tag of filtered out object' '
(
cd limit-by-paths &&
git fast-export --tag-of-filtered-object=rewrite mytag -- there > output &&
test_cmp expected output
)
'
test_expect_success 'rewrite tag predating pathspecs to nothing' '
test_create_repo rewrite_tag_predating_pathspecs &&
(
cd rewrite_tag_predating_pathspecs &&
test_commit initial &&
git tag -a -m "Some old tag" v0.0.0.0.0.0.1 &&
test_commit bar &&
git fast-export --tag-of-filtered-object=rewrite --all -- bar.t >output &&
grep from.$ZERO_OID output
)
'
cat > limit-by-paths/expected << EOF
blob
mark :1
data 4
foo
blob
mark :2
data 3
hi
reset refs/heads/main
commit refs/heads/main
mark :3
author A U Thor <author@example.com> 1112912713 -0700
committer C O Mitter <committer@example.com> 1112912713 -0700
data 12
Second file
M 100644 :1 bar
M 100644 :2 there
EOF
test_expect_failure 'no exact-ref revisions included' '
(
cd limit-by-paths &&
git fast-export main~2..main~1 > output &&
test_cmp expected output
)
'
test_expect_success 'path limiting with import-marks does not lose unmodified files' '
git checkout -b simple marks~2 &&
git fast-export --export-marks=marks simple -- file > /dev/null &&
echo more content >> file &&
test_tick &&
git commit -mnext file &&
git fast-export --import-marks=marks simple -- file file0 >actual &&
grep file0 actual
'
test_expect_success 'avoid corrupt stream with non-existent mark' '
test_create_repo avoid_non_existent_mark &&
(
cd avoid_non_existent_mark &&
test_commit important-path &&
test_commit ignored &&
git branch A &&
git branch B &&
echo foo >>important-path.t &&
git add important-path.t &&
test_commit more changes &&
git fast-export --all -- important-path.t | git fast-import --force
)
'
test_expect_success 'full-tree re-shows unmodified files' '
git checkout -f simple &&
git fast-export --full-tree simple >actual &&
test $(grep -c file0 actual) -eq 3
'
test_expect_success 'set-up a few more tags for tag export tests' '
git checkout -f main &&
HEAD_TREE=$(git show -s --pretty=raw HEAD | grep tree | sed "s/tree //") &&
git tag tree_tag -m "tagging a tree" $HEAD_TREE &&
git tag -a tree_tag-obj -m "tagging a tree" $HEAD_TREE &&
git tag tag-obj_tag -m "tagging a tag" tree_tag-obj &&
git tag -a tag-obj_tag-obj -m "tagging a tag" tree_tag-obj
'
test_expect_success 'tree_tag' '
mkdir result &&
(cd result && git init) &&
git fast-export tree_tag > fe-stream &&
(cd result && git fast-import < ../fe-stream)
'
# NEEDSWORK: not just check return status, but validate the output
# Note that these tests DO NOTHING other than print a warning that
# they are omitting the one tag we asked them to export (because the
# tags resolve to a tree). They exist just to make sure we do not
# abort but instead just warn.
test_expect_success 'tree_tag-obj' 'git fast-export tree_tag-obj'
test_expect_success 'tag-obj_tag' 'git fast-export tag-obj_tag'
test_expect_success 'tag-obj_tag-obj' 'git fast-export tag-obj_tag-obj'
test_expect_success 'handling tags of blobs' '
git tag -a -m "Tag of a blob" blobtag $(git rev-parse main:file) &&
git fast-export blobtag >actual &&
cat >expect <<-EOF &&
blob
mark :1
data 9
die Luft
tag blobtag
from :1
tagger $GIT_COMMITTER_NAME <$GIT_COMMITTER_EMAIL> $GIT_COMMITTER_DATE
data 14
Tag of a blob
EOF
test_cmp expect actual
'
test_expect_success 'handling nested tags' '
git tag -a -m "This is a nested tag" nested muss &&
git fast-export --mark-tags nested >output &&
grep "^from $ZERO_OID$" output &&
grep "^tag nested$" output >tag_lines &&
test_line_count = 2 tag_lines
'
test_expect_success 'directory becomes symlink' '
git init dirtosymlink &&
git init result &&
(
cd dirtosymlink &&
mkdir foo &&
mkdir bar &&
echo hello > foo/world &&
echo hello > bar/world &&
git add foo/world bar/world &&
git commit -q -mone &&
git rm -r foo &&
test_ln_s_add bar foo &&
git commit -q -mtwo
) &&
(
cd dirtosymlink &&
git fast-export main -- foo |
(cd ../result && git fast-import --quiet)
) &&
(cd result && git show main:foo)
'
test_expect_success 'fast-export quotes pathnames' '
git init crazy-paths &&
test_config -C crazy-paths core.protectNTFS false &&
(cd crazy-paths &&
blob=$(echo foo | git hash-object -w --stdin) &&
git -c core.protectNTFS=false update-index --add \
--cacheinfo 100644 $blob "$(printf "path with\\nnewline")" \
--cacheinfo 100644 $blob "path with \"quote\"" \
--cacheinfo 100644 $blob "path with \\backslash" \
--cacheinfo 100644 $blob "path with space" &&
git commit -m addition &&
git ls-files -z -s | perl -0pe "s{\\t}{$&subdir/}" >index &&
git read-tree --empty &&
git update-index -z --index-info <index &&
git commit -m rename &&
git read-tree --empty &&
git commit -m deletion &&
git fast-export -M HEAD >export.out &&
git rev-list HEAD >expect &&
git init result &&
cd result &&
git fast-import <../export.out &&
git rev-list HEAD >actual &&
test_cmp ../expect actual
)
'
test_expect_success 'test bidirectionality' '
git init marks-test &&
git fast-export --export-marks=marks-cur --import-marks-if-exists=marks-cur --branches | \
git --git-dir=marks-test/.git fast-import --export-marks=marks-new --import-marks-if-exists=marks-new &&
(cd marks-test &&
git reset --hard &&
echo Wohlauf > file &&
git commit -a -m "back in time") &&
git --git-dir=marks-test/.git fast-export --export-marks=marks-new --import-marks-if-exists=marks-new --branches | \
git fast-import --export-marks=marks-cur --import-marks-if-exists=marks-cur
'
cat > expected << EOF
blob
mark :13
data 5
bump
commit refs/heads/main
mark :14
author A U Thor <author@example.com> 1112912773 -0700
committer C O Mitter <committer@example.com> 1112912773 -0700
data 5
bump
from :12
M 100644 :13 file
EOF
test_expect_success 'avoid uninteresting refs' '
> tmp-marks &&
git fast-export --import-marks=tmp-marks \
--export-marks=tmp-marks main > /dev/null &&
git tag v1.0 &&
git branch uninteresting &&
echo bump > file &&
git commit -a -m bump &&
git fast-export --import-marks=tmp-marks \
--export-marks=tmp-marks ^uninteresting ^v1.0 main > actual &&
test_cmp expected actual
'
cat > expected << EOF
reset refs/heads/main
from :14
EOF
test_expect_success 'refs are updated even if no commits need to be exported' '
> tmp-marks &&
git fast-export --import-marks=tmp-marks \
--export-marks=tmp-marks main > /dev/null &&
git fast-export --import-marks=tmp-marks \
--export-marks=tmp-marks main > actual &&
test_cmp expected actual
'
test_expect_success 'use refspec' '
git fast-export --refspec refs/heads/main:refs/heads/foobar main >actual2 &&
grep "^commit " actual2 | sort | uniq >actual &&
echo "commit refs/heads/foobar" > expected &&
test_cmp expected actual
'
test_expect_success 'delete ref because entire history excluded' '
git branch to-delete &&
git fast-export to-delete ^to-delete >actual &&
cat >expected <<-EOF &&
reset refs/heads/to-delete
from $ZERO_OID
EOF
test_cmp expected actual
'
test_expect_success 'delete refspec' '
git fast-export --refspec :refs/heads/to-delete >actual &&
cat >expected <<-EOF &&
reset refs/heads/to-delete
from $ZERO_OID
EOF
test_cmp expected actual
'
test_expect_success 'when using -C, do not declare copy when source of copy is also modified' '
test_create_repo src &&
echo a_line >src/file.txt &&
git -C src add file.txt &&
git -C src commit -m 1st_commit &&
cp src/file.txt src/file2.txt &&
echo another_line >>src/file.txt &&
git -C src add file.txt file2.txt &&
git -C src commit -m 2nd_commit &&
test_create_repo dst &&
git -C src fast-export --all -C >actual &&
git -C dst fast-import <actual &&
git -C src show >expected &&
git -C dst show >actual &&
test_cmp expected actual
'
test_expect_success 'merge commit gets exported with --import-marks' '
test_create_repo merging &&
(
cd merging &&
test_commit initial &&
git checkout -b topic &&
test_commit on-topic &&
git checkout main &&
test_commit on-main &&
test_tick &&
git merge --no-ff -m Yeah topic &&
echo ":1 $(git rev-parse HEAD^^)" >marks &&
git fast-export --import-marks=marks main >out &&
grep Yeah out
)
'
test_expect_success 'fast-export --first-parent outputs all revisions output by revision walk' '
git init first-parent &&
(
cd first-parent &&
test_commit A &&
git checkout -b topic1 &&
test_commit B &&
git checkout main &&
git merge --no-ff topic1 &&
git checkout -b topic2 &&
test_commit C &&
git checkout main &&
git merge --no-ff topic2 &&
test_commit D &&
git fast-export main -- --first-parent >first-parent-export &&
git fast-export main -- --first-parent --reverse >first-parent-reverse-export &&
test_cmp first-parent-export first-parent-reverse-export &&
git init import &&
git -C import fast-import <first-parent-export &&
git log --format="%ad %s" --first-parent main >expected &&
git -C import log --format="%ad %s" --all >actual &&
test_cmp expected actual &&
test_line_count = 4 actual
)
'
test_done
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