git-p4: add config git-p4.pathEncoding

Perforce keeps the encoding of a path as given by the originating OS.
Git expects paths encoded as UTF-8. Add a config to tell git-p4 what
encoding Perforce had used for the paths. This encoding is used to
transcode the paths to UTF-8. As an example, Perforce on Windows often
uses “cp1252” to encode path names.

Signed-off-by: Lars Schneider <larsxschneider@gmail.com>
Acked-by: Luke Diamand <luke@diamand.org>
Signed-off-by: Lars Schneider <larsxschneider@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

t/t9822-git-p4-path-encoding.sh

@@ -0,0 +1,58 @@
+#!/bin/sh
+
+test_description='Clone repositories with non ASCII paths'
+
+. ./lib-git-p4.sh
+
+UTF8_ESCAPED="a-\303\244_o-\303\266_u-\303\274.txt"
+ISO8859_ESCAPED="a-\344_o-\366_u-\374.txt"
+
+test_expect_success 'start p4d' '
+	start_p4d
+'
+
+test_expect_success 'Create a repo containing iso8859-1 encoded paths' '
+	(
+		cd "$cli" &&
+		ISO8859="$(printf "$ISO8859_ESCAPED")" &&
+		echo content123 >"$ISO8859" &&
+		p4 add "$ISO8859" &&
+		p4 submit -d "test commit"
+	)
+'
+
+test_expect_failure 'Clone auto-detects depot with iso8859-1 paths' '
+	git p4 clone --destination="$git" //depot &&
+	test_when_finished cleanup_git &&
+	(
+		cd "$git" &&
+		UTF8="$(printf "$UTF8_ESCAPED")" &&
+		echo "$UTF8" >expect &&
+		git -c core.quotepath=false ls-files >actual &&
+		test_cmp expect actual
+	)
+'
+
+test_expect_success 'Clone repo containing iso8859-1 encoded paths with git-p4.pathEncoding' '
+	test_when_finished cleanup_git &&
+	(
+		cd "$git" &&
+		git init . &&
+		git config git-p4.pathEncoding iso8859-1 &&
+		git p4 clone --use-client-spec --destination="$git" //depot &&
+		UTF8="$(printf "$UTF8_ESCAPED")" &&
+		echo "$UTF8" >expect &&
+		git -c core.quotepath=false ls-files >actual &&
+		test_cmp expect actual &&
+
+		echo content123 >expect &&
+		cat "$UTF8" >actual &&
+		test_cmp expect actual
+	)
+'
+
+test_expect_success 'kill p4d' '
+	kill_p4d
+'
+
+test_done