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diff --git a/t/t3910-mac-os-precompose.sh b/t/t3910-mac-os-precompose.sh
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+#!/bin/sh
+#
+# Copyright (c) 2012 Torsten Bögershausen
+#
+
+test_description='utf-8 decomposed (nfd) converted to precomposed (nfc)'
+
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+. ./test-lib.sh
+
+if ! test_have_prereq UTF8_NFD_TO_NFC
+then
+ skip_all="filesystem does not corrupt utf-8"
+ test_done
+fi
+
+# create utf-8 variables
+Adiarnfc=$(printf '\303\204')
+Adiarnfd=$(printf 'A\314\210')
+
+Odiarnfc=$(printf '\303\226')
+Odiarnfd=$(printf 'O\314\210')
+AEligatu=$(printf '\303\206')
+Invalidu=$(printf '\303\377')
+
+
+#Create a string with 255 bytes (decomposed)
+Alongd=$Adiarnfd$Adiarnfd$Adiarnfd$Adiarnfd$Adiarnfd$Adiarnfd$Adiarnfd #21 Byte
+Alongd=$Alongd$Alongd$Alongd #63 Byte
+Alongd=$Alongd$Alongd$Alongd$Alongd$Adiarnfd #255 Byte
+
+#Create a string with 254 bytes (precomposed)
+Alongc=$AEligatu$AEligatu$AEligatu$AEligatu$AEligatu #10 Byte
+Alongc=$Alongc$Alongc$Alongc$Alongc$Alongc #50 Byte
+Alongc=$Alongc$Alongc$Alongc$Alongc$Alongc #250 Byte
+Alongc=$Alongc$AEligatu$AEligatu #254 Byte
+
+test_expect_success "detect if nfd needed" '
+ precomposeunicode=$(git config core.precomposeunicode) &&
+ test "$precomposeunicode" = true &&
+ git config core.precomposeunicode true
+'
+test_expect_success "setup" '
+ >x &&
+ git add x &&
+ git commit -m "1st commit" &&
+ git rm x &&
+ git commit -m "rm x"
+'
+test_expect_success "setup case mac" '
+ git checkout -b mac_os
+'
+# This will test nfd2nfc in git diff
+test_expect_success "git diff f.Adiar" '
+ touch f.$Adiarnfc &&
+ git add f.$Adiarnfc &&
+ echo f.Adiarnfc >f.$Adiarnfc &&
+ git diff f.$Adiarnfd >expect &&
+ git diff f.$Adiarnfc >actual &&
+ test_cmp expect actual &&
+ git reset HEAD f.Adiarnfc &&
+ rm f.$Adiarnfc expect actual
+'
+# This will test nfd2nfc in git diff-files
+test_expect_success "git diff-files f.Adiar" '
+ touch f.$Adiarnfc &&
+ git add f.$Adiarnfc &&
+ echo f.Adiarnfc >f.$Adiarnfc &&
+ git diff-files f.$Adiarnfd >expect &&
+ git diff-files f.$Adiarnfc >actual &&
+ test_cmp expect actual &&
+ git reset HEAD f.Adiarnfc &&
+ rm f.$Adiarnfc expect actual
+'
+# This will test nfd2nfc in git diff-index
+test_expect_success "git diff-index f.Adiar" '
+ touch f.$Adiarnfc &&
+ git add f.$Adiarnfc &&
+ echo f.Adiarnfc >f.$Adiarnfc &&
+ git diff-index HEAD f.$Adiarnfd >expect &&
+ git diff-index HEAD f.$Adiarnfc >actual &&
+ test_cmp expect actual &&
+ git reset HEAD f.Adiarnfc &&
+ rm f.$Adiarnfc expect actual
+'
+# This will test nfd2nfc in readdir()
+test_expect_success "add file Adiarnfc" '
+ echo f.Adiarnfc >f.$Adiarnfc &&
+ git add f.$Adiarnfc &&
+ git commit -m "add f.$Adiarnfc"
+'
+# This will test nfd2nfc in git diff-tree
+test_expect_success "git diff-tree f.Adiar" '
+ echo f.Adiarnfc >>f.$Adiarnfc &&
+ git diff-tree HEAD f.$Adiarnfd >expect &&
+ git diff-tree HEAD f.$Adiarnfc >actual &&
+ test_cmp expect actual &&
+ git checkout f.$Adiarnfc &&
+ rm expect actual
+'
+# This will test nfd2nfc in git stage()
+test_expect_success "stage file d.Adiarnfd/f.Adiarnfd" '
+ mkdir d.$Adiarnfd &&
+ echo d.$Adiarnfd/f.$Adiarnfd >d.$Adiarnfd/f.$Adiarnfd &&
+ git stage d.$Adiarnfd/f.$Adiarnfd &&
+ git commit -m "add d.$Adiarnfd/f.$Adiarnfd"
+'
+test_expect_success "add link Adiarnfc" '
+ ln -s d.$Adiarnfd/f.$Adiarnfd l.$Adiarnfc &&
+ git add l.$Adiarnfc &&
+ git commit -m "add l.Adiarnfc"
+'
+# This will test git log
+test_expect_success "git log f.Adiar" '
+ git log f.$Adiarnfc > f.Adiarnfc.log &&
+ git log f.$Adiarnfd > f.Adiarnfd.log &&
+ test -s f.Adiarnfc.log &&
+ test -s f.Adiarnfd.log &&
+ test_cmp f.Adiarnfc.log f.Adiarnfd.log &&
+ rm f.Adiarnfc.log f.Adiarnfd.log
+'
+# This will test git ls-files
+test_expect_success "git lsfiles f.Adiar" '
+ git ls-files f.$Adiarnfc > f.Adiarnfc.log &&
+ git ls-files f.$Adiarnfd > f.Adiarnfd.log &&
+ test -s f.Adiarnfc.log &&
+ test -s f.Adiarnfd.log &&
+ test_cmp f.Adiarnfc.log f.Adiarnfd.log &&
+ rm f.Adiarnfc.log f.Adiarnfd.log
+'
+# This will test git mv
+test_expect_success "git mv" '
+ git mv f.$Adiarnfd f.$Odiarnfc &&
+ git mv d.$Adiarnfd d.$Odiarnfc &&
+ git mv l.$Adiarnfd l.$Odiarnfc &&
+ git commit -m "mv Adiarnfd Odiarnfc"
+'
+# Files can be checked out as nfc
+# And the link has been corrected from nfd to nfc
+test_expect_success "git checkout nfc" '
+ rm f.$Odiarnfc &&
+ git checkout f.$Odiarnfc
+'
+# Make it possible to checkout files with their NFD names
+test_expect_success "git checkout file nfd" '
+ rm -f f.* &&
+ git checkout f.$Odiarnfd
+'
+# Make it possible to checkout links with their NFD names
+test_expect_success "git checkout link nfd" '
+ rm l.* &&
+ git checkout l.$Odiarnfd
+'
+test_expect_success "setup case mac2" '
+ git checkout main &&
+ git reset --hard &&
+ git checkout -b mac_os_2
+'
+# This will test nfd2nfc in git commit
+test_expect_success "commit file d2.Adiarnfd/f.Adiarnfd" '
+ mkdir d2.$Adiarnfd &&
+ echo d2.$Adiarnfd/f.$Adiarnfd >d2.$Adiarnfd/f.$Adiarnfd &&
+ git add d2.$Adiarnfd/f.$Adiarnfd &&
+ git commit -m "add d2.$Adiarnfd/f.$Adiarnfd" -- d2.$Adiarnfd/f.$Adiarnfd
+'
+test_expect_success "setup for long decomposed filename" '
+ git checkout main &&
+ git reset --hard &&
+ git checkout -b mac_os_long_nfd_fn
+'
+test_expect_success "Add long decomposed filename" '
+ echo longd >$Alongd &&
+ git add * &&
+ git commit -m "Long filename"
+'
+test_expect_success "setup for long precomposed filename" '
+ git checkout main &&
+ git reset --hard &&
+ git checkout -b mac_os_long_nfc_fn
+'
+test_expect_success "Add long precomposed filename" '
+ echo longc >$Alongc &&
+ git add * &&
+ git commit -m "Long filename"
+'
+
+test_expect_failure 'handle existing decomposed filenames' '
+ echo content >"verbatim.$Adiarnfd" &&
+ git -c core.precomposeunicode=false add "verbatim.$Adiarnfd" &&
+ git commit -m "existing decomposed file" &&
+ git ls-files --exclude-standard -o "verbatim*" >untracked &&
+ test_must_be_empty untracked
+'
+
+test_expect_success "unicode decomposed: git restore -p . " '
+ DIRNAMEPWD=dir.Odiarnfc &&
+ DIRNAMEINREPO=dir.$Adiarnfc &&
+ export DIRNAMEPWD DIRNAMEINREPO &&
+ git init "$DIRNAMEPWD" &&
+ (
+ cd "$DIRNAMEPWD" &&
+ mkdir "$DIRNAMEINREPO" &&
+ cd "$DIRNAMEINREPO" &&
+ echo "Initial" >file &&
+ git add file &&
+ echo "More stuff" >>file &&
+ echo y | git restore -p .
+ )
+'
+
+# Test if the global core.precomposeunicode stops autosensing
+# Must be the last test case
+test_expect_success "respect git config --global core.precomposeunicode" '
+ git config --global core.precomposeunicode true &&
+ rm -rf .git &&
+ git init &&
+ precomposeunicode=$(git config core.precomposeunicode) &&
+ test "$precomposeunicode" = "true"
+'
+
+test_done