From 0cd3b798913ef39dd1d69b5f29b276507cd02cb8 Mon Sep 17 00:00:00 2001
Message-Id: <0cd3b798913ef39dd1d69b5f29b276507cd02cb8.1716684590.git.mdw@distorted.org.uk>
From: Mark Wooding <mdw@chiark.greenend.org.uk>
Date: Sat, 5 May 2018 00:49:59 +0100
Subject: [PATCH] Makefile: Introduce an option to hack a prefix onto shebang
 lines.
Organization: Straylight/Edgeware

From: Mark Wooding <mdw@distorted.org.uk>

The `Termux' distribution lives in a subdirectory of the weird Android
filesystem.  Rather than symlinking scripts into `~/bin', copy them and
hack the shebang lines so that they can still find their interpreters
properly.
---
 Makefile | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/Makefile b/Makefile
index ea368f2..af5dc13 100644
--- a/Makefile
+++ b/Makefile
@@ -338,6 +338,19 @@ $(relax)### generated by $(HERE)/Makefile; do not edit!" \
 ### Processing script links.
 
 script-source		 = $(HERE)/bin/$(or $($1_SRC), $1)
+
+ifeq ($(prefix-shebang-p),t)
+all:: $(addprefix $(HOME)/bin/, $(SCRIPTLINKS))
+$(addprefix $(HOME)/bin/, $(SCRIPTLINKS)): $(HOME)/bin/%: \
+		$$(call script-source,$$*) Makefile
+	$(call v_tag,SHEBANG)mkdir -p $(dir $@) && \
+		rm -f $@.new && \
+		sed "1s\(#! *\)/\1$(SHEBANG_PREFIX)/" \
+			$(call script-source,$*) >$@.new && \
+		chmod --reference=$(call script-source,$*) $@.new && \
+		mv $@.new $@
+	$(script-hook/$*)
+else
 scriptlink-ok-p		 = \
 	$(call symlink-ok-p,$(HOME)/bin/$1,$(call script-source,$1))
 all:: $(addprefix $(HOME)/bin/, $(SCRIPTLINKS))
@@ -348,6 +361,7 @@ $(addprefix $(HOME)/bin/, $(SCRIPTLINKS)): $(HOME)/bin/%: \
 		ln -s $(call script-source,$*) $@.new && \
 		mv $@.new $@
 	$(script-hook/$*)
+endif
 
 all:: $(addprefix $(HOME)/bin/, $(SCRIPTLINKS))
 
-- 
[mdw]