git/t/t2080-parallel-checkout-basics.sh
Matheus Tavares ea08db7473 t2080: fix cp invocation to copy symlinks instead of following them
t2080 makes a few copies of a test repository and later performs a
branch switch on each one of the copies to verify that parallel checkout
and sequential checkout produce the same results. However, the
repository is copied with `cp -R` which, on some systems, defaults to
following symlinks on the directory hierarchy and copying their target
files instead of copying the symlinks themselves. AIX is one example of
system where this happens. Because the symlinks are not preserved, the
copied repositories have paths that do not match what is in the index,
causing git to abort the checkout operation that we want to test. This
makes the test fail on these systems.

Fix this by copying the repository with the POSIX flag '-P', which
forces cp to copy the symlinks instead of following them. Note that we
already use this flag for other cp invocations in our test suite (see
t7001). With this change, t2080 now passes on AIX.

Reported-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Matheus Tavares <matheus.bernardino@usp.br>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2021-05-27 09:04:49 +09:00

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#!/bin/sh
test_description='parallel-checkout basics
Ensure that parallel-checkout basically works on clone and checkout, spawning
the required number of workers and correctly populating both the index and the
working tree.
'
TEST_NO_CREATE_REPO=1
. ./test-lib.sh
. "$TEST_DIRECTORY/lib-parallel-checkout.sh"
# Test parallel-checkout with a branch switch containing a variety of file
# creations, deletions, and modifications, involving different entry types.
# The branches B1 and B2 have the following paths:
#
# B1 B2
# a/a (file) a (file)
# b (file) b/b (file)
#
# c/c (file) c (symlink)
# d (symlink) d/d (file)
#
# e/e (file) e (submodule)
# f (submodule) f/f (file)
#
# g (submodule) g (symlink)
# h (symlink) h (submodule)
#
# Additionally, the following paths are present on both branches, but with
# different contents:
#
# i (file) i (file)
# j (symlink) j (symlink)
# k (submodule) k (submodule)
#
# And the following paths are only present in one of the branches:
#
# l/l (file) -
# - m/m (file)
#
test_expect_success 'setup repo for checkout with various types of changes' '
git init sub &&
(
cd sub &&
git checkout -b B2 &&
echo B2 >file &&
git add file &&
git commit -m file &&
git checkout -b B1 &&
echo B1 >file &&
git add file &&
git commit -m file
) &&
git init various &&
(
cd various &&
git checkout -b B1 &&
mkdir a c e &&
echo a/a >a/a &&
echo b >b &&
echo c/c >c/c &&
test_ln_s_add c d &&
echo e/e >e/e &&
git submodule add ../sub f &&
git submodule add ../sub g &&
test_ln_s_add c h &&
echo "B1 i" >i &&
test_ln_s_add c j &&
git submodule add -b B1 ../sub k &&
mkdir l &&
echo l/l >l/l &&
git add . &&
git commit -m B1 &&
git checkout -b B2 &&
git rm -rf :^.gitmodules :^k &&
mkdir b d f &&
echo a >a &&
echo b/b >b/b &&
test_ln_s_add b c &&
echo d/d >d/d &&
git submodule add ../sub e &&
echo f/f >f/f &&
test_ln_s_add b g &&
git submodule add ../sub h &&
echo "B2 i" >i &&
test_ln_s_add b j &&
git -C k checkout B2 &&
mkdir m &&
echo m/m >m/m &&
git add . &&
git commit -m B2 &&
git checkout --recurse-submodules B1
)
'
for mode in sequential parallel sequential-fallback
do
case $mode in
sequential) workers=1 threshold=0 expected_workers=0 ;;
parallel) workers=2 threshold=0 expected_workers=2 ;;
sequential-fallback) workers=2 threshold=100 expected_workers=0 ;;
esac
test_expect_success "$mode checkout" '
repo=various_$mode &&
cp -R -P various $repo &&
# The just copied files have more recent timestamps than their
# associated index entries. So refresh the cached timestamps
# to avoid an "entry not up-to-date" error from `git checkout`.
# We only have to do this for the submodules as `git checkout`
# will already refresh the superproject index before performing
# the up-to-date check.
#
git -C $repo submodule foreach "git update-index --refresh" &&
set_checkout_config $workers $threshold &&
test_checkout_workers $expected_workers \
git -C $repo checkout --recurse-submodules B2 &&
verify_checkout $repo
'
done
for mode in parallel sequential-fallback
do
case $mode in
parallel) workers=2 threshold=0 expected_workers=2 ;;
sequential-fallback) workers=2 threshold=100 expected_workers=0 ;;
esac
test_expect_success "$mode checkout on clone" '
repo=various_${mode}_clone &&
set_checkout_config $workers $threshold &&
test_checkout_workers $expected_workers \
git clone --recurse-submodules --branch B2 various $repo &&
verify_checkout $repo
'
done
# Just to be paranoid, actually compare the working trees' contents directly.
test_expect_success 'compare the working trees' '
rm -rf various_*/.git &&
rm -rf various_*/*/.git &&
# We use `git diff` instead of `diff -r` because the latter would
# follow symlinks, and not all `diff` implementations support the
# `--no-dereference` option.
#
git diff --no-index various_sequential various_parallel &&
git diff --no-index various_sequential various_parallel_clone &&
git diff --no-index various_sequential various_sequential-fallback &&
git diff --no-index various_sequential various_sequential-fallback_clone
'
# Currently, each submodule is checked out in a separated child process, but
# these subprocesses must also be able to use parallel checkout workers to
# write the submodules' entries.
test_expect_success 'submodules can use parallel checkout' '
set_checkout_config 2 0 &&
git init super &&
(
cd super &&
git init sub &&
test_commit -C sub A &&
test_commit -C sub B &&
git submodule add ./sub &&
git commit -m sub &&
rm sub/* &&
test_checkout_workers 2 git checkout --recurse-submodules .
)
'
test_expect_success 'parallel checkout respects --[no]-force' '
set_checkout_config 2 0 &&
git init dirty &&
(
cd dirty &&
mkdir D &&
test_commit D/F &&
test_commit F &&
rm -rf D &&
echo changed >D &&
echo changed >F.t &&
# We expect 0 workers because there is nothing to be done
test_checkout_workers 0 git checkout HEAD &&
test_path_is_file D &&
grep changed D &&
grep changed F.t &&
test_checkout_workers 2 git checkout --force HEAD &&
test_path_is_dir D &&
grep D/F D/F.t &&
grep F F.t
)
'
test_expect_success SYMLINKS 'parallel checkout checks for symlinks in leading dirs' '
set_checkout_config 2 0 &&
git init symlinks &&
(
cd symlinks &&
mkdir D untracked &&
# Commit 2 files to have enough work for 2 parallel workers
test_commit D/A &&
test_commit D/B &&
rm -rf D &&
ln -s untracked D &&
test_checkout_workers 2 git checkout --force HEAD &&
! test -h D &&
grep D/A D/A.t &&
grep D/B D/B.t
)
'
test_done