Merge branch 'jk/http-errors'

Propagate the error messages from the webserver better to the
client coming over the HTTP transport.

* jk/http-errors:
  http: default text charset to iso-8859-1
  remote-curl: reencode http error messages
  strbuf: add strbuf_reencode helper
  http: optionally extract charset parameter from content-type
  http: extract type/subtype portion of content-type
  t5550: test display of remote http error messages
  t/lib-httpd: use write_script to copy CGI scripts
  test-lib: preserve GIT_CURL_VERBOSE from the environment

6 files changed, 58 insertions, 2 deletions

diff --git a/t/lib-httpd.sh b/t/lib-httpd.sh
index 8b67021a6b..272fceef96 100644
--- a/t/lib-httpd.sh
+++ b/t/lib-httpd.sh
@@ -110,10 +110,15 @@ else
 		"Could not identify web server at '$LIB_HTTPD_PATH'"
 fi
 
+install_script () {
+	write_script "$HTTPD_ROOT_PATH/$1" <"$TEST_PATH/$1"
+}
+
 prepare_httpd() {
 	mkdir -p "$HTTPD_DOCUMENT_ROOT_PATH"
 	cp "$TEST_PATH"/passwd "$HTTPD_ROOT_PATH"
-	cp "$TEST_PATH"/broken-smart-http.sh "$HTTPD_ROOT_PATH"
+	install_script broken-smart-http.sh
+	install_script error.sh
 
 	ln -s "$LIB_HTTPD_MODULE_PATH" "$HTTPD_ROOT_PATH/modules"
 
diff --git a/t/lib-httpd/apache.conf b/t/lib-httpd/apache.conf
index 3a03e8263d..b384d79935 100644
--- a/t/lib-httpd/apache.conf
+++ b/t/lib-httpd/apache.conf
@@ -97,12 +97,16 @@ Alias /auth/dumb/ www/auth/dumb/
 </LocationMatch>
 ScriptAliasMatch /smart_*[^/]*/(.*) ${GIT_EXEC_PATH}/git-http-backend/$1
 ScriptAlias /broken_smart/ broken-smart-http.sh/
+ScriptAlias /error/ error.sh/
 <Directory ${GIT_EXEC_PATH}>
 	Options FollowSymlinks
 </Directory>
 <Files broken-smart-http.sh>
 	Options ExecCGI
 </Files>
+<Files error.sh>
+  Options ExecCGI
+</Files>
 <Files ${GIT_EXEC_PATH}/git-http-backend>
 	Options ExecCGI
 </Files>
diff --git a/t/lib-httpd/broken-smart-http.sh b/t/lib-httpd/broken-smart-http.sh
index f7ebfffa80..82cc610b0a 100755..100644
--- a/t/lib-httpd/broken-smart-http.sh
+++ b/t/lib-httpd/broken-smart-http.sh
@@ -1,4 +1,3 @@
-#!/bin/sh
 printf "Content-Type: text/%s\n" "html"
 echo
 printf "%s\n" "001e# service=git-upload-pack"
diff --git a/t/lib-httpd/error.sh b/t/lib-httpd/error.sh
new file mode 100755
index 0000000000..eafc9d2d90
--- /dev/null
+++ b/t/lib-httpd/error.sh
@@ -0,0 +1,27 @@
+#!/bin/sh
+
+printf "Status: 500 Intentional Breakage\n"
+
+printf "Content-Type: "
+charset=iso-8859-1
+case "$PATH_INFO" in
+*html*)
+	printf "text/html"
+	;;
+*text*)
+	printf "text/plain"
+	;;
+*charset*)
+	printf "text/plain; charset=utf-8"
+	charset=utf-8
+	;;
+*utf16*)
+	printf "text/plain; charset=utf-16"
+	charset=utf-16
+	;;
+esac
+printf "\n"
+
+printf "\n"
+printf "this is the error message\n" |
+iconv -f us-ascii -t $charset
diff --git a/t/t5550-http-fetch-dumb.sh b/t/t5550-http-fetch-dumb.sh
index 1a3a2b6c1a..01b8aae2ed 100755
--- a/t/t5550-http-fetch-dumb.sh
+++ b/t/t5550-http-fetch-dumb.sh
@@ -171,5 +171,25 @@ test_expect_success 'did not use upload-pack service' '
 	test_cmp exp act
 '
 
+test_expect_success 'git client shows text/plain errors' '
+	test_must_fail git clone "$HTTPD_URL/error/text" 2>stderr &&
+	grep "this is the error message" stderr
+'
+
+test_expect_success 'git client does not show html errors' '
+	test_must_fail git clone "$HTTPD_URL/error/html" 2>stderr &&
+	! grep "this is the error message" stderr
+'
+
+test_expect_success 'git client shows text/plain with a charset' '
+	test_must_fail git clone "$HTTPD_URL/error/charset" 2>stderr &&
+	grep "this is the error message" stderr
+'
+
+test_expect_success 'http error messages are reencoded' '
+	test_must_fail git clone "$HTTPD_URL/error/utf16" 2>stderr &&
+	grep "this is the error message" stderr
+'
+
 stop_httpd
 test_done
diff --git a/t/test-lib.sh b/t/test-lib.sh
index c081668dfe..f7e55b1001 100644
--- a/t/test-lib.sh
+++ b/t/test-lib.sh
@@ -91,6 +91,7 @@ unset VISUAL EMAIL LANGUAGE COLUMNS $("$PERL_PATH" -e '
 		VALGRIND
 		UNZIP
 		PERF_
+		CURL_VERBOSE
 	));
 	my @vars = grep(/^GIT_/ && !/^GIT_($ok)/o, @env);
 	print join("\n", @vars);