From da4e2efb9249cb8cd1e382a7653da0140bb1c95d Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Marc=20Andr=C3=A9=20Tanner?= <mat@brain-dump.org>
Date: Fri, 31 Mar 2017 08:28:10 +0200
Subject: Use a minimal POSIX shar implementation for self extracting
 executable

This only requires POSIX shell utilies for extraction. The resulting
archive is bigger (it is not gzip compressed) and startup will be slower
due to many spawned processes.
---
 GNUmakefile   |   3 +-
 shar.sh       | 120 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 vis-single.sh |  14 -------
 3 files changed, 121 insertions(+), 16 deletions(-)
 create mode 100755 shar.sh
 delete mode 100755 vis-single.sh

diff --git a/GNUmakefile b/GNUmakefile
index c19a64c..16635c0 100644
--- a/GNUmakefile
+++ b/GNUmakefile
@@ -256,10 +256,9 @@ standalone: clean
 	PATH=$(DEPS_BIN):$$PATH $(MAKE)
 
 single: standalone
-	cp vis-single.sh vis-single
 	for e in $(ELF); do \
 		${STRIP} "$$e"; \
 	done
-	tar c $(EXECUTABLES) lua/ | gzip -9 >> vis-single
+	./shar.sh vis-single $(EXECUTABLES) $$(find lua -name '*.lua')
 
 .PHONY: standalone local dependencies-common dependencies-local dependencies-clean
diff --git a/shar.sh b/shar.sh
new file mode 100755
index 0000000..c7a532c
--- /dev/null
+++ b/shar.sh
@@ -0,0 +1,120 @@
+#!/bin/sh
+# Modified version of https://shiz.me/junk/code/fun/shar.sh
+# The generated shell archive is automatically extracted to a
+# temporary directory and the first archive member is executed.
+set -e
+
+if test $# -lt 2 ; then
+	echo "usage: $0 <output> <files>"
+	exit 1
+fi
+
+save() {
+	for i ; do
+		printf "%s\n" "$i" | sed "s/'/'\\\\''/g;1s/^/'/;\$s/\$/' \\\\/"
+	done
+	echo " "
+}
+
+octal_mode() {
+	local mode
+
+	mode="$(ls -ld "$1" | awk '{ print $1 }' | tr '[A-Z]' '-' | cut -c2-)"
+	for i in 1 2 3 ; do
+		i=0
+		case "$mode" in r??*) i=$((i + 4)) ;; esac
+		case "$mode" in ?w?*) i=$((i + 2)) ;; esac
+		case "$mode" in ??-*) ;; ???*) i=$((i + 1)) ;; esac
+		printf "%d" "$i"
+		mode=$(echo "$mode" | cut -c4-)
+	done
+}
+
+out=$1
+tmpout=$1.tmp
+exe=$2
+shift
+
+rm -f "$tmpout"
+for f ; do
+	if test -f "$f" ; then
+		cat "$f" >> "$tmpout"
+	fi
+done
+trap 'rm "$tmpout"' EXIT
+
+clear=
+
+for f ; do
+	if test -z "$clear" ; then
+		set --
+		clear=1
+	fi
+
+	mode=$(octal_mode "$f")
+	if test -f "$f" ; then
+		size=$(wc -c "$f" | awk '{ print $1 }')
+		echo "adding: $f (mode $mode, $size bytes)"
+		set -- "$@" "f+$mode+$size:$f"
+	elif test -d "$f" ; then
+		echo "adding directory: $f (mode $mode)"
+		set -- "$@" "d+$mode:$f"
+	else
+		echo "can't add unknown file type $f" >&2
+	fi
+done
+
+cat >"$out"<<HEADER
+#!/bin/sh
+set -e
+
+outdir="\$(mktemp -d -p "\${TMPDIR:-/tmp}" .unshar-XXXXXX)"
+if test \$? -ne 0 -o ! -d "\$outdir" ; then
+	echo "failed to create temporary directory"
+	exit 1
+fi
+trap 'rm -rf "\$outdir"' EXIT INT QUIT TERM HUP
+argc=\$#
+
+self="\$0"
+set -- $(save "$@") "\$@"
+
+exec 3<"\$self"
+while read -r l ; do
+	test "\$l" = "exit 0;" && break
+done <&3
+
+while test \$# -gt \$argc ; do
+	file="\$1"
+	shift
+	meta="\${file%%:*}"
+	fn="\${file#*:}"
+	type="\${meta%%+*}"
+	meta="\${meta#*+}"
+	mode="\${meta%%+*}"
+	size="\${meta#*+}"
+	base="\${fn%/*}"
+
+	case "\$type" in
+	f)
+		echo "unpacking: \$fn (mode \$mode, \$size bytes)"
+		test "\$base" != "\$fn" && mkdir -p "\$outdir/\$base"
+		dd of="\$outdir/\$fn" bs="\$size" count=1 >/dev/null <&3
+		;;
+	d)
+		echo "creating: \$fn (mode \$mode)"
+		mkdir -p "\$outdir/\$fn"
+		;;
+	esac
+	chmod "\$mode" "\$outdir/\$fn" || :
+done >/dev/null 2>&1
+
+PATH="\$outdir:\$PATH" "\$outdir/$exe" "\$@"
+exit \$?
+
+exit 0;
+HEADER
+
+cat "$tmpout" >> "$out"
+chmod +x "$out"
+
diff --git a/vis-single.sh b/vis-single.sh
deleted file mode 100755
index e779b67..0000000
--- a/vis-single.sh
+++ /dev/null
@@ -1,14 +0,0 @@
-#!/bin/sh
-
-set -e
-
-VISTMP="$(mktemp -d -p "${TMPDIR:-/tmp}" .vis-XXXXXX)"
-trap 'rm -rf "$VISTMP"' EXIT INT QUIT TERM HUP
-
-sed '1,/^__TAR_GZ_ARCHIVE_BELOW__$/d' "$0" | gzip -d | tar xC "$VISTMP"
-
-PATH="$VISTMP:$PATH" "$VISTMP/vis" "$@"
-
-exit $?
-
-__TAR_GZ_ARCHIVE_BELOW__
-- 
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