convert: check for detectable errors in UTF encodings

Check that new content is valid with respect to the user defined
'working-tree-encoding' attribute.

Signed-off-by: Lars Schneider <larsxschneider@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Lars Schneider 2018-04-15 20:16:08 +02:00 коммит произвёл Junio C Hamano
Родитель 107642fe26
Коммит 7a17918c34
2 изменённых файлов: 123 добавлений и 0 удалений

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@ -266,6 +266,64 @@ static int will_convert_lf_to_crlf(size_t len, struct text_stat *stats,
}
static int validate_encoding(const char *path, const char *enc,
const char *data, size_t len, int die_on_error)
{
/* We only check for UTF here as UTF?? can be an alias for UTF-?? */
if (istarts_with(enc, "UTF")) {
/*
* Check for detectable errors in UTF encodings
*/
if (has_prohibited_utf_bom(enc, data, len)) {
const char *error_msg = _(
"BOM is prohibited in '%s' if encoded as %s");
/*
* This advice is shown for UTF-??BE and UTF-??LE encodings.
* We cut off the last two characters of the encoding name
* to generate the encoding name suitable for BOMs.
*/
const char *advise_msg = _(
"The file '%s' contains a byte order "
"mark (BOM). Please use UTF-%s as "
"working-tree-encoding.");
const char *stripped = NULL;
char *upper = xstrdup_toupper(enc);
upper[strlen(upper)-2] = '\0';
if (!skip_prefix(upper, "UTF-", &stripped))
skip_prefix(stripped, "UTF", &stripped);
advise(advise_msg, path, stripped);
free(upper);
if (die_on_error)
die(error_msg, path, enc);
else {
return error(error_msg, path, enc);
}
} else if (is_missing_required_utf_bom(enc, data, len)) {
const char *error_msg = _(
"BOM is required in '%s' if encoded as %s");
const char *advise_msg = _(
"The file '%s' is missing a byte order "
"mark (BOM). Please use UTF-%sBE or UTF-%sLE "
"(depending on the byte order) as "
"working-tree-encoding.");
const char *stripped = NULL;
char *upper = xstrdup_toupper(enc);
if (!skip_prefix(upper, "UTF-", &stripped))
skip_prefix(stripped, "UTF", &stripped);
advise(advise_msg, path, stripped, stripped);
free(upper);
if (die_on_error)
die(error_msg, path, enc);
else {
return error(error_msg, path, enc);
}
}
}
return 0;
}
static const char *default_encoding = "UTF-8";
static int encode_to_git(const char *path, const char *src, size_t src_len,
@ -291,6 +349,9 @@ static int encode_to_git(const char *path, const char *src, size_t src_len,
if (!buf && !src)
return 1;
if (validate_encoding(path, enc, src, src_len, die_on_error))
return 0;
dst = reencode_string_len(src, src_len, default_encoding, enc,
&dst_len);
if (!dst) {

Просмотреть файл

@ -62,6 +62,52 @@ test_expect_success 'check $GIT_DIR/info/attributes support' '
for i in 16 32
do
test_expect_success "check prohibited UTF-${i} BOM" '
test_when_finished "git reset --hard HEAD" &&
echo "*.utf${i}be text working-tree-encoding=utf-${i}be" >>.gitattributes &&
echo "*.utf${i}le text working-tree-encoding=utf-${i}LE" >>.gitattributes &&
# Here we add a UTF-16 (resp. UTF-32) files with BOM (big/little-endian)
# but we tell Git to treat it as UTF-16BE/UTF-16LE (resp. UTF-32).
# In these cases the BOM is prohibited.
cp bebom.utf${i}be.raw bebom.utf${i}be &&
test_must_fail git add bebom.utf${i}be 2>err.out &&
test_i18ngrep "fatal: BOM is prohibited .* utf-${i}be" err.out &&
test_i18ngrep "use UTF-${i} as working-tree-encoding" err.out &&
cp lebom.utf${i}le.raw lebom.utf${i}be &&
test_must_fail git add lebom.utf${i}be 2>err.out &&
test_i18ngrep "fatal: BOM is prohibited .* utf-${i}be" err.out &&
test_i18ngrep "use UTF-${i} as working-tree-encoding" err.out &&
cp bebom.utf${i}be.raw bebom.utf${i}le &&
test_must_fail git add bebom.utf${i}le 2>err.out &&
test_i18ngrep "fatal: BOM is prohibited .* utf-${i}LE" err.out &&
test_i18ngrep "use UTF-${i} as working-tree-encoding" err.out &&
cp lebom.utf${i}le.raw lebom.utf${i}le &&
test_must_fail git add lebom.utf${i}le 2>err.out &&
test_i18ngrep "fatal: BOM is prohibited .* utf-${i}LE" err.out &&
test_i18ngrep "use UTF-${i} as working-tree-encoding" err.out
'
test_expect_success "check required UTF-${i} BOM" '
test_when_finished "git reset --hard HEAD" &&
echo "*.utf${i} text working-tree-encoding=utf-${i}" >>.gitattributes &&
cp nobom.utf${i}be.raw nobom.utf${i} &&
test_must_fail git add nobom.utf${i} 2>err.out &&
test_i18ngrep "fatal: BOM is required .* utf-${i}" err.out &&
test_i18ngrep "use UTF-${i}BE or UTF-${i}LE" err.out &&
cp nobom.utf${i}le.raw nobom.utf${i} &&
test_must_fail git add nobom.utf${i} 2>err.out &&
test_i18ngrep "fatal: BOM is required .* utf-${i}" err.out &&
test_i18ngrep "use UTF-${i}BE or UTF-${i}LE" err.out
'
test_expect_success "eol conversion for UTF-${i} encoded files on checkout" '
test_when_finished "rm -f crlf.utf${i}.raw lf.utf${i}.raw" &&
test_when_finished "git reset --hard HEAD^" &&
@ -139,4 +185,20 @@ test_expect_success 'error if encoding round trip is not the same during refresh
test_i18ngrep "error: .* overwritten by checkout:" err.out
'
test_expect_success 'error if encoding garbage is already in Git' '
BEFORE_STATE=$(git rev-parse HEAD) &&
test_when_finished "git reset --hard $BEFORE_STATE" &&
# Skip the UTF-16 filter for the added file
# This simulates a Git version that has no checkoutEncoding support
cp nobom.utf16be.raw nonsense.utf16 &&
TEST_HASH=$(git hash-object --no-filters -w nonsense.utf16) &&
git update-index --add --cacheinfo 100644 $TEST_HASH nonsense.utf16 &&
COMMIT=$(git commit-tree -p $(git rev-parse HEAD) -m "plain commit" $(git write-tree)) &&
git update-ref refs/heads/master $COMMIT &&
git diff 2>err.out &&
test_i18ngrep "error: BOM is required" err.out
'
test_done