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Diffstat (limited to 't/t2081-parallel-checkout-collisions.sh')
| -rwxr-xr-x | t/t2081-parallel-checkout-collisions.sh | 163 |
1 files changed, 163 insertions, 0 deletions
diff --git a/t/t2081-parallel-checkout-collisions.sh b/t/t2081-parallel-checkout-collisions.sh new file mode 100755 index 0000000..6acdb89 --- /dev/null +++ b/t/t2081-parallel-checkout-collisions.sh @@ -0,0 +1,163 @@ +#!/bin/sh + +test_description="path collisions during parallel checkout + +Parallel checkout must detect path collisions to: + +1) Avoid racily writing to different paths that represent the same file on disk. +2) Report the colliding entries on clone. + +The tests in this file exercise parallel checkout's collision detection code in +both these mechanics. +" + +TEST_PASSES_SANITIZE_LEAK=true +. ./test-lib.sh +. "$TEST_DIRECTORY/lib-parallel-checkout.sh" + +TEST_ROOT="$PWD" + +test_expect_success CASE_INSENSITIVE_FS 'setup' ' + empty_oid=$(git hash-object -w --stdin </dev/null) && + cat >objs <<-EOF && + 100644 $empty_oid FILE_X + 100644 $empty_oid FILE_x + 100644 $empty_oid file_X + 100644 $empty_oid file_x + EOF + git update-index --index-info <objs && + git commit -m "colliding files" && + git tag basename_collision && + + write_script "$TEST_ROOT"/logger_script <<-\EOF + echo "$@" >>filter.log + EOF +' + +test_workers_in_event_trace () +{ + test $1 -eq $(grep ".event.:.child_start..*checkout--worker" $2 | wc -l) +} + +test_expect_success CASE_INSENSITIVE_FS 'worker detects basename collision' ' + GIT_TRACE2_EVENT="$(pwd)/trace" git \ + -c checkout.workers=2 -c checkout.thresholdForParallelism=0 \ + checkout . && + + test_workers_in_event_trace 2 trace && + collisions=$(grep -i "category.:.pcheckout.,.key.:.collision/basename.,.value.:.file_x.}" trace | wc -l) && + test $collisions -eq 3 +' + +test_expect_success CASE_INSENSITIVE_FS 'worker detects dirname collision' ' + test_config filter.logger.smudge "\"$TEST_ROOT/logger_script\" %f" && + empty_oid=$(git hash-object -w --stdin </dev/null) && + + # By setting a filter command to "a", we make it ineligible for parallel + # checkout, and thus it is checked out *first*. This way we can ensure + # that "A/B" and "A/C" will both collide with the regular file "a". + # + attr_oid=$(echo "a filter=logger" | git hash-object -w --stdin) && + + cat >objs <<-EOF && + 100644 $empty_oid A/B + 100644 $empty_oid A/C + 100644 $empty_oid a + 100644 $attr_oid .gitattributes + EOF + git rm -rf . && + git update-index --index-info <objs && + + rm -f trace filter.log && + GIT_TRACE2_EVENT="$(pwd)/trace" git \ + -c checkout.workers=2 -c checkout.thresholdForParallelism=0 \ + checkout . && + + # Check that "a" (and only "a") was filtered + echo a >expected.log && + test_cmp filter.log expected.log && + + # Check that it used the right number of workers and detected the collisions + test_workers_in_event_trace 2 trace && + grep "category.:.pcheckout.,.key.:.collision/dirname.,.value.:.A/B.}" trace && + grep "category.:.pcheckout.,.key.:.collision/dirname.,.value.:.A/C.}" trace +' + +test_expect_success SYMLINKS,CASE_INSENSITIVE_FS 'do not follow symlinks colliding with leading dir' ' + empty_oid=$(git hash-object -w --stdin </dev/null) && + symlink_oid=$(echo "./e" | git hash-object -w --stdin) && + mkdir e && + + cat >objs <<-EOF && + 120000 $symlink_oid D + 100644 $empty_oid d/x + 100644 $empty_oid e/y + EOF + git rm -rf . && + git update-index --index-info <objs && + + set_checkout_config 2 0 && + test_checkout_workers 2 git checkout . && + test_path_is_dir e && + test_path_is_missing e/x +' + +# The two following tests check that parallel checkout correctly reports +# colliding entries on clone. The sequential code detects a collision by +# calling lstat() before trying to open(O_CREAT) a file. (Note that this only +# works for clone.) Then, to find the pair of a colliding item k, it searches +# cache_entry[0, k-1]. This is not sufficient in parallel checkout because: +# +# - A colliding file may be created between the lstat() and open() calls; +# - A colliding entry might appear in the second half of the cache_entry array. +# +test_expect_success CASE_INSENSITIVE_FS 'collision report on clone (w/ racy file creation)' ' + git reset --hard basename_collision && + set_checkout_config 2 0 && + test_checkout_workers 2 git clone . clone-repo 2>stderr && + + grep FILE_X stderr && + grep FILE_x stderr && + grep file_X stderr && + grep file_x stderr && + grep "the following paths have collided" stderr +' + +# This test ensures that the collision report code is correctly looking for +# colliding peers in the second half of the cache_entry array. This is done by +# defining a smudge command for the *last* array entry, which makes it +# non-eligible for parallel-checkout. Thus, it is checked out *first*, before +# spawning the workers. +# +# Note: this test doesn't work on Windows because, on this system, the +# collision report code uses strcmp() to find the colliding pairs when +# core.ignoreCase is false. And we need this setting for this test so that only +# 'file_x' matches the pattern of the filter attribute. But the test works on +# OSX, where the colliding pairs are found using inode. +# +test_expect_success CASE_INSENSITIVE_FS,!MINGW,!CYGWIN \ + 'collision report on clone (w/ colliding peer after the detected entry)' ' + + test_config_global filter.logger.smudge "\"$TEST_ROOT/logger_script\" %f" && + git reset --hard basename_collision && + echo "file_x filter=logger" >.gitattributes && + git add .gitattributes && + git commit -m "filter for file_x" && + + rm -rf clone-repo && + set_checkout_config 2 0 && + test_checkout_workers 2 \ + git -c core.ignoreCase=false clone . clone-repo 2>stderr && + + grep FILE_X stderr && + grep FILE_x stderr && + grep file_X stderr && + grep file_x stderr && + grep "the following paths have collided" stderr && + + # Check that only "file_x" was filtered + echo file_x >expected.log && + test_cmp clone-repo/filter.log expected.log +' + +test_done |