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Diffstat (limited to 't/t4058-diff-duplicates.sh')
| -rwxr-xr-x | t/t4058-diff-duplicates.sh | 189 |
1 files changed, 189 insertions, 0 deletions
diff --git a/t/t4058-diff-duplicates.sh b/t/t4058-diff-duplicates.sh new file mode 100755 index 0000000..2501c89 --- /dev/null +++ b/t/t4058-diff-duplicates.sh @@ -0,0 +1,189 @@ +#!/bin/sh + +# NOTICE: +# This testsuite does a number of diffs and checks that the output match. +# However, it is a "garbage in, garbage out" situation; the trees have +# duplicate entries for individual paths, and it results in diffs that do +# not make much sense. As such, it is not clear that the diffs are +# "correct". The primary purpose of these tests was to verify that +# diff-tree does not segfault, but there is perhaps some value in ensuring +# that the diff output isn't wildly unreasonable. + +test_description='test tree diff when trees have duplicate entries' +. ./test-lib.sh + +# make_tree_entry <mode> <mode> <sha1> +# +# We have to rely on perl here because not all printfs understand +# hex escapes (only octal), and xxd is not portable. +make_tree_entry () { + printf '%s %s\0' "$1" "$2" && + perl -e 'print chr(hex($_)) for ($ARGV[0] =~ /../g)' "$3" +} + +# Like git-mktree, but without all of the pesky sanity checking. +# Arguments come in groups of three, each group specifying a single +# tree entry (see make_tree_entry above). +make_tree () { + while test $# -gt 2; do + make_tree_entry "$1" "$2" "$3" + shift; shift; shift + done | + git hash-object --literally -w -t tree --stdin +} + +# this is kind of a convoluted setup, but matches +# a real-world case. Each tree contains four entries +# for the given path, one with one sha1, and three with +# the other. The first tree has them split across +# two subtrees (which are themselves duplicate entries in +# the root tree), and the second has them all in a single subtree. +test_expect_success 'create trees with duplicate entries' ' + blob_one=$(echo one | git hash-object -w --stdin) && + blob_two=$(echo two | git hash-object -w --stdin) && + inner_one_a=$(make_tree \ + 100644 inner $blob_one + ) && + inner_one_b=$(make_tree \ + 100644 inner $blob_two \ + 100644 inner $blob_two \ + 100644 inner $blob_two + ) && + outer_one=$(make_tree \ + 040000 outer $inner_one_a \ + 040000 outer $inner_one_b + ) && + inner_two=$(make_tree \ + 100644 inner $blob_one \ + 100644 inner $blob_two \ + 100644 inner $blob_two \ + 100644 inner $blob_two + ) && + outer_two=$(make_tree \ + 040000 outer $inner_two + ) && + git tag one $outer_one && + git tag two $outer_two +' + +test_expect_success 'create tree without duplicate entries' ' + blob_one=$(echo one | git hash-object -w --stdin) && + outer_three=$(make_tree \ + 100644 renamed $blob_one + ) && + git tag three $outer_three +' + +test_expect_success 'diff-tree between duplicate trees' ' + # See NOTICE at top of file + { + printf ":000000 100644 $ZERO_OID $blob_two A\touter/inner\n" && + printf ":000000 100644 $ZERO_OID $blob_two A\touter/inner\n" && + printf ":000000 100644 $ZERO_OID $blob_two A\touter/inner\n" && + printf ":100644 000000 $blob_two $ZERO_OID D\touter/inner\n" && + printf ":100644 000000 $blob_two $ZERO_OID D\touter/inner\n" && + printf ":100644 000000 $blob_two $ZERO_OID D\touter/inner\n" + } >expect && + git diff-tree -r --no-abbrev one two >actual && + test_cmp expect actual +' + +test_expect_success 'diff-tree with renames' ' + # See NOTICE at top of file. + git diff-tree -M -r --no-abbrev one two >actual && + test_must_be_empty actual +' + +test_expect_success 'diff-tree FROM duplicate tree' ' + # See NOTICE at top of file. + { + printf ":100644 000000 $blob_one $ZERO_OID D\touter/inner\n" && + printf ":100644 000000 $blob_two $ZERO_OID D\touter/inner\n" && + printf ":100644 000000 $blob_two $ZERO_OID D\touter/inner\n" && + printf ":100644 000000 $blob_two $ZERO_OID D\touter/inner\n" && + printf ":000000 100644 $ZERO_OID $blob_one A\trenamed\n" + } >expect && + git diff-tree -r --no-abbrev one three >actual && + test_cmp expect actual +' + +test_expect_success 'diff-tree FROM duplicate tree, with renames' ' + # See NOTICE at top of file. + { + printf ":100644 000000 $blob_two $ZERO_OID D\touter/inner\n" && + printf ":100644 000000 $blob_two $ZERO_OID D\touter/inner\n" && + printf ":100644 000000 $blob_two $ZERO_OID D\touter/inner\n" && + printf ":100644 100644 $blob_one $blob_one R100\touter/inner\trenamed\n" + } >expect && + git diff-tree -M -r --no-abbrev one three >actual && + test_cmp expect actual +' + +test_expect_success 'create a few commits' ' + git commit-tree -m "Duplicate Entries" two^{tree} >commit_id && + git branch base $(cat commit_id) && + + git commit-tree -p $(cat commit_id) -m "Just one" three^{tree} >up && + git branch update $(cat up) && + + git commit-tree -p $(cat up) -m "Back to weird" two^{tree} >final && + git branch final $(cat final) && + + rm commit_id up final +' + +test_expect_failure 'git read-tree does not segfault' ' + test_when_finished rm .git/index.lock && + test_might_fail git read-tree --reset base +' + +test_expect_failure 'reset --hard does not segfault' ' + test_when_finished rm .git/index.lock && + git checkout base && + test_might_fail git reset --hard +' + +test_expect_failure 'git diff HEAD does not segfault' ' + git checkout base && + GIT_TEST_CHECK_CACHE_TREE=false && + git reset --hard && + test_might_fail git diff HEAD +' + +test_expect_failure 'can switch to another branch when status is empty' ' + git clean -ffdqx && + git status --porcelain -uno >actual && + test_must_be_empty actual && + git checkout update +' + +test_expect_success 'forcibly switch to another branch, verify status empty' ' + git checkout -f update && + git status --porcelain -uno >actual && + test_must_be_empty actual +' + +test_expect_success 'fast-forward from non-duplicate entries to duplicate' ' + git merge final +' + +test_expect_failure 'clean status, switch branches, status still clean' ' + git status --porcelain -uno >actual && + test_must_be_empty actual && + git checkout base && + git status --porcelain -uno >actual && + test_must_be_empty actual +' + +test_expect_success 'switch to base branch and force status to be clean' ' + git checkout base && + GIT_TEST_CHECK_CACHE_TREE=false git reset --hard && + git status --porcelain -uno >actual && + test_must_be_empty actual +' + +test_expect_failure 'fast-forward from duplicate entries to non-duplicate' ' + git merge update +' + +test_done |