worktree: update is_bare heuristics

diff --git a/t/t0028-working-tree-encoding.sh b/t/t0028-working-tree-encoding.sh
index 7e87b5a200a3f6483ea2e243fa0c497205ce4e61..1090e650edb788ec7dc570c0412cb87b1f245219 100755 (executable)
--- a/t/t0028-working-tree-encoding.sh
+++ b/t/t0028-working-tree-encoding.sh
@@ -6,14 +6,41 @@ test_description='working-tree-encoding conversion via gitattributes'
 
 GIT_TRACE_WORKING_TREE_ENCODING=1 && export GIT_TRACE_WORKING_TREE_ENCODING
 
+test_lazy_prereq NO_UTF16_BOM '
+       test $(printf abc | iconv -f UTF-8 -t UTF-16 | wc -c) = 6
+'
+
+test_lazy_prereq NO_UTF32_BOM '
+       test $(printf abc | iconv -f UTF-8 -t UTF-32 | wc -c) = 12
+'
+
+write_utf16 () {
+       if test_have_prereq NO_UTF16_BOM
+       then
+               printf '\xfe\xff'
+       fi &&
+       iconv -f UTF-8 -t UTF-16
+}
+
+write_utf32 () {
+       if test_have_prereq NO_UTF32_BOM
+       then
+               printf '\x00\x00\xfe\xff'
+       fi &&
+       iconv -f UTF-8 -t UTF-32
+}
+
 test_expect_success 'setup test files' '
        git config core.eol lf &&
 
        text="hallo there!\ncan you read me?" &&
        echo "*.utf16 text working-tree-encoding=utf-16" >.gitattributes &&
+       echo "*.utf16lebom text working-tree-encoding=UTF-16LE-BOM" >>.gitattributes &&
        printf "$text" >test.utf8.raw &&
-       printf "$text" | iconv -f UTF-8 -t UTF-16 >test.utf16.raw &&
-       printf "$text" | iconv -f UTF-8 -t UTF-32 >test.utf32.raw &&
+       printf "$text" | write_utf16 >test.utf16.raw &&
+       printf "$text" | write_utf32 >test.utf32.raw &&
+       printf "\377\376"                         >test.utf16lebom.raw &&
+       printf "$text" | iconv -f UTF-8 -t UTF-32LE >>test.utf16lebom.raw &&
 
        # Line ending tests
        printf "one\ntwo\nthree\n" >lf.utf8.raw &&
@@ -22,17 +49,18 @@ test_expect_success 'setup test files' '
        # BOM tests
        printf "\0a\0b\0c"                         >nobom.utf16be.raw &&
        printf "a\0b\0c\0"                         >nobom.utf16le.raw &&
-       printf "\376\777\0a\0b\0c"                 >bebom.utf16be.raw &&
-       printf "\777\376a\0b\0c\0"                 >lebom.utf16le.raw &&
+       printf "\376\377\0a\0b\0c"                 >bebom.utf16be.raw &&
+       printf "\377\376a\0b\0c\0"                 >lebom.utf16le.raw &&
        printf "\0\0\0a\0\0\0b\0\0\0c"             >nobom.utf32be.raw &&
        printf "a\0\0\0b\0\0\0c\0\0\0"             >nobom.utf32le.raw &&
-       printf "\0\0\376\777\0\0\0a\0\0\0b\0\0\0c" >bebom.utf32be.raw &&
-       printf "\777\376\0\0a\0\0\0b\0\0\0c\0\0\0" >lebom.utf32le.raw &&
+       printf "\0\0\376\377\0\0\0a\0\0\0b\0\0\0c" >bebom.utf32be.raw &&
+       printf "\377\376\0\0a\0\0\0b\0\0\0c\0\0\0" >lebom.utf32le.raw &&
 
        # Add only UTF-16 file, we will add the UTF-32 file later
        cp test.utf16.raw test.utf16 &&
        cp test.utf32.raw test.utf32 &&
-       git add .gitattributes test.utf16 &&
+       cp test.utf16lebom.raw test.utf16lebom &&
+       git add .gitattributes test.utf16 test.utf16lebom &&
        git commit -m initial
 '
 
@@ -51,6 +79,12 @@ test_expect_success 're-encode to UTF-16 on checkout' '
        test_cmp_bin test.utf16.raw test.utf16
 '
 
+test_expect_success 're-encode to UTF-16-LE-BOM on checkout' '
+       rm test.utf16lebom &&
+       git checkout test.utf16lebom &&
+       test_cmp_bin test.utf16lebom.raw test.utf16lebom
+'
+
 test_expect_success 'check $GIT_DIR/info/attributes support' '
        test_when_finished "rm -f test.utf32.git" &&
        test_when_finished "git reset --hard HEAD" &&
@@ -114,8 +148,8 @@ do
                test_when_finished "rm -f crlf.utf${i}.raw lf.utf${i}.raw" &&
                test_when_finished "git reset --hard HEAD^" &&
 
-               cat lf.utf8.raw | iconv -f UTF-8 -t UTF-${i} >lf.utf${i}.raw &&
-               cat crlf.utf8.raw | iconv -f UTF-8 -t UTF-${i} >crlf.utf${i}.raw &&
+               cat lf.utf8.raw | write_utf${i} >lf.utf${i}.raw &&
+               cat crlf.utf8.raw | write_utf${i} >crlf.utf${i}.raw &&
                cp crlf.utf${i}.raw eol.utf${i} &&
 
                cat >expectIndexLF <<-EOF &&
@@ -213,7 +247,7 @@ test_expect_success ICONV_SHIFT_JIS 'check roundtrip encoding' '
 
        text="hallo there!\nroundtrip test here!" &&
        printf "$text" | iconv -f UTF-8 -t SHIFT-JIS >roundtrip.shift &&
-       printf "$text" | iconv -f UTF-8 -t UTF-16 >roundtrip.utf16 &&
+       printf "$text" | write_utf16 >roundtrip.utf16 &&
        echo "*.shift text working-tree-encoding=SHIFT-JIS" >>.gitattributes &&
 
        # SHIFT-JIS encoded files are round-trip checked by default...