Merge branch 'ar/i18n-no-gettext'

* ar/i18n-no-gettext:
  i18n: Do not force USE_GETTEXT_SCHEME=fallthrough on NO_GETTEXT
  i18n: Make NO_GETTEXT imply fallthrough scheme in shell l10n
  add a Makefile switch to avoid gettext translation in shell scripts
  git-sh-i18n: restructure the logic to compute gettext.sh scheme

Makefile

@@ -47,6 +47,9 @@ all::
 # A translated Git requires GNU libintl or another gettext implementation,
 # plus libintl-perl at runtime.
 #
+# Define USE_GETTEXT_SCHEME and set it to 'fallthrough', if you don't trust
+# the installed gettext translation of the shell scripts output.
+#
 # Define HAVE_LIBCHARSET_H if you haven't set NO_GETTEXT and you can't
 # trust the langinfo.h's nl_langinfo(CODESET) function to return the
 # current character set. GNU and Solaris have a nl_langinfo(CODESET),
@@ -1521,6 +1524,7 @@ ifdef GETTEXT_POISON
 endif
 ifdef NO_GETTEXT
 	BASIC_CFLAGS += -DNO_GETTEXT
+	USE_GETTEXT_SCHEME ?= fallthrough
 endif
 ifdef NO_STRCASESTR
 	COMPAT_CFLAGS += -DNO_STRCASESTR
@@ -1887,6 +1891,7 @@ sed -e '1s|#!.*/sh|#!$(SHELL_PATH_SQ)|' \
     -e 's/@@GIT_VERSION@@/$(GIT_VERSION)/g' \
     -e 's|@@LOCALEDIR@@|$(localedir_SQ)|g' \
     -e 's/@@NO_CURL@@/$(NO_CURL)/g' \
+    -e 's/@@USE_GETTEXT_SCHEME@@/$(USE_GETTEXT_SCHEME)/g' \
     -e $(BROKEN_PATH_FIX) \
     $@.sh >$@+
 endef
@@ -2264,7 +2269,7 @@ cscope:
 ### Detect prefix changes
 TRACK_CFLAGS = $(CC):$(subst ','\'',$(ALL_CFLAGS)):\
              $(bindir_SQ):$(gitexecdir_SQ):$(template_dir_SQ):$(prefix_SQ):\
-             $(localedir_SQ)
+             $(localedir_SQ):$(USE_GETTEXT_SCHEME)
 
 GIT-CFLAGS: FORCE
 	@FLAGS='$(TRACK_CFLAGS)'; \

git-sh-i18n.sh

@@ -16,69 +16,69 @@ else
 fi
 export TEXTDOMAINDIR
 
-if test -z "$GIT_GETTEXT_POISON"
+# First decide what scheme to use...
+GIT_INTERNAL_GETTEXT_SH_SCHEME=fallthrough
+if test -n "@@USE_GETTEXT_SCHEME@@"
+then
+	GIT_INTERNAL_GETTEXT_SH_SCHEME="@@USE_GETTEXT_SCHEME@@"
+elif test -n "@@USE_FALLTHROUGH_GETTEXT_SCHEME@@$GIT_INTERNAL_GETTEXT_TEST_FALLBACKS"
+then
+	: no probing necessary
+elif test -n "$GIT_GETTEXT_POISON"
 then
-	if test -z "$GIT_INTERNAL_GETTEXT_TEST_FALLBACKS" && type gettext.sh >/dev/null 2>&1
-	then
-		# This is GNU libintl's gettext.sh, we don't need to do anything
-		# else than setting up the environment and loading gettext.sh
-		GIT_INTERNAL_GETTEXT_SH_SCHEME=gnu
-		export GIT_INTERNAL_GETTEXT_SH_SCHEME
-
-		# Try to use libintl's gettext.sh, or fall back to English if we
-		# can't.
-		. gettext.sh
-
-	elif test -z "$GIT_INTERNAL_GETTEXT_TEST_FALLBACKS" && test "$(gettext -h 2>&1)" = "-h"
-	then
-		# We don't have gettext.sh, but there's a gettext binary in our
-		# path. This is probably Solaris or something like it which has a
-		# gettext implementation that isn't GNU libintl.
-		GIT_INTERNAL_GETTEXT_SH_SCHEME=solaris
-		export GIT_INTERNAL_GETTEXT_SH_SCHEME
-
-		# Solaris has a gettext(1) but no eval_gettext(1)
-		eval_gettext () {
-			gettext "$1" | (
-				export PATH $(git sh-i18n--envsubst --variables "$1");
-				git sh-i18n--envsubst "$1"
-			)
-		}
-
-	else
-		# Since gettext.sh isn't available we'll have to define our own
-		# dummy pass-through functions.
-
-		# Tell our tests that we don't have the real gettext.sh
-		GIT_INTERNAL_GETTEXT_SH_SCHEME=fallthrough
-		export GIT_INTERNAL_GETTEXT_SH_SCHEME
-
-		gettext () {
-			printf "%s" "$1"
-		}
-
-		eval_gettext () {
-			printf "%s" "$1" | (
-				export PATH $(git sh-i18n--envsubst --variables "$1");
-				git sh-i18n--envsubst "$1"
-			)
-		}
-	fi
-else
-	# Emit garbage under GETTEXT_POISON=YesPlease. Unlike the C tests
-	# this relies on an environment variable
-
 	GIT_INTERNAL_GETTEXT_SH_SCHEME=poison
-	export GIT_INTERNAL_GETTEXT_SH_SCHEME
+elif type gettext.sh >/dev/null 2>&1
+then
+	# GNU libintl's gettext.sh
+	GIT_INTERNAL_GETTEXT_SH_SCHEME=gnu
+elif test "$(gettext -h 2>&1)" = "-h"
+then
+	# gettext binary exists but no gettext.sh. likely to be a gettext
+	# binary on a Solaris or something that is not GNU libintl and
+	# lack eval_gettext.
+	GIT_INTERNAL_GETTEXT_SH_SCHEME=gettext_without_eval_gettext
+fi
+export GIT_INTERNAL_GETTEXT_SH_SCHEME
 
+# ... and then follow that decision.
+case "$GIT_INTERNAL_GETTEXT_SH_SCHEME" in
+gnu)
+	# Use libintl's gettext.sh, or fall back to English if we can't.
+	. gettext.sh
+	;;
+gettext_without_eval_gettext)
+	# Solaris has a gettext(1) but no eval_gettext(1)
+	eval_gettext () {
+		gettext "$1" | (
+			export PATH $(git sh-i18n--envsubst --variables "$1");
+			git sh-i18n--envsubst "$1"
+		)
+	}
+	;;
+poison)
+	# Emit garbage so that tests that incorrectly rely on translatable
+	# strings will fail.
 	gettext () {
 		printf "%s" "# GETTEXT POISON #"
 	}
 
 	eval_gettext () {
 		printf "%s" "# GETTEXT POISON #"
 	}
-fi
+	;;
+*)
+	gettext () {
+		printf "%s" "$1"
+	}
+
+	eval_gettext () {
+		printf "%s" "$1" | (
+			export PATH $(git sh-i18n--envsubst --variables "$1");
+			git sh-i18n--envsubst "$1"
+		)
+	}
+	;;
+esac
 
 # Git-specific wrapper functions
 gettextln () {