Fix shebang for termux.

Termux doesn't have a /bin/sh. So we needto use $SHELL.
Keep /bin/sh as much as possible.

configure.ac

@@ -459,6 +459,16 @@ case "$build_os" in
 esac
 AC_SUBST(BUILD_EXEEXT)
 
+# In some build environments like termux /bin/sh is not a valid
+# shebang. Use $SHELL instead if it's executable and /bin/sh isn't
+BUILD_SHEBANG=/bin/sh
+for she in /bin/sh "$SHELL"; do
+  if test -x "$she" ; then
+    BUILD_SHEBANG="$she"
+  fi
+done
+AC_SUBST(BUILD_SHEBANG)
+
 # For gnulib.
 gl_INIT
 

grub-core/genmod.sh.in

@@ -1,4 +1,4 @@
-#! /bin/sh
+#! @BUILD_SHEBANG@
 set -e
 
 # Copyright (C) 2010 Free Software Foundation, Inc.

grub-core/gensyminfo.sh.in

@@ -1,4 +1,4 @@
-#! /bin/sh
+#! @BUILD_SHEBANG@
 set -e
 
 # Copyright (C) 2010 Free Software Foundation, Inc.

grub-core/modinfo.sh.in

@@ -1,4 +1,4 @@
-#!/bin/sh
+#!@BUILD_SHEBANG@
 
 # User-controllable options
 grub_modinfo_target_cpu=@target_cpu@

tests/ahci_test.in

@@ -1,4 +1,4 @@
-#! /bin/sh
+#! @BUILD_SHEBANG@
 # Copyright (C) 2013  Free Software Foundation, Inc.
 #
 # GRUB is free software: you can redistribute it and/or modify

tests/btrfs_test.in

@@ -1,4 +1,4 @@
-#!/bin/sh
+#!@BUILD_SHEBANG@
 
 set -e
 

tests/cdboot_test.in

@@ -1,4 +1,4 @@
-#! /bin/sh
+#! @BUILD_SHEBANG@
 # Copyright (C) 2013  Free Software Foundation, Inc.
 #
 # GRUB is free software: you can redistribute it and/or modify

tests/core_compress_test.in

@@ -1,4 +1,4 @@
-#! /bin/sh
+#! @BUILD_SHEBANG@
 # Copyright (C) 2013  Free Software Foundation, Inc.
 #
 # GRUB is free software: you can redistribute it and/or modify

tests/cpio_test.in

@@ -1,4 +1,4 @@
-#!/bin/sh
+#!@BUILD_SHEBANG@
 
 set -e
 

tests/ehci_test.in

@@ -1,4 +1,4 @@
-#! /bin/sh
+#! @BUILD_SHEBANG@
 # Copyright (C) 2013  Free Software Foundation, Inc.
 #
 # GRUB is free software: you can redistribute it and/or modify

tests/example_scripted_test.in

@@ -1,4 +1,4 @@
-#!/bin/sh
+#!@BUILD_SHEBANG@
 set -e
 
 true

tests/exfat_test.in

@@ -1,4 +1,4 @@
-#!/bin/sh
+#!@BUILD_SHEBANG@
 
 set -e
 

tests/ext234_test.in

@@ -1,4 +1,4 @@
-#!/bin/sh
+#!@BUILD_SHEBANG@
 
 set -e
 

tests/fat_test.in

@@ -1,4 +1,4 @@
-#!/bin/sh
+#!@BUILD_SHEBANG@
 
 set -e
 

tests/fddboot_test.in

@@ -1,4 +1,4 @@
-#! /bin/sh
+#! @BUILD_SHEBANG@
 # Copyright (C) 2013  Free Software Foundation, Inc.
 #
 # GRUB is free software: you can redistribute it and/or modify

tests/file_filter_test.in

@@ -1,4 +1,4 @@
-#! /bin/sh
+#! @BUILD_SHEBANG@
 # Copyright (C) 2014  Free Software Foundation, Inc.
 #
 # GRUB is free software: you can redistribute it and/or modify

tests/gettext_strings_test.in

@@ -1,4 +1,4 @@
-#!/bin/sh
+#!@BUILD_SHEBANG@
 
 cd '@srcdir@'
 

tests/grub_cmd_date.in

@@ -1,4 +1,4 @@
-#! /bin/sh
+#! @BUILD_SHEBANG@
 set -e
 
 . "@builddir@/grub-core/modinfo.sh"

tests/grub_cmd_regexp.in

@@ -1,4 +1,4 @@
-#! /bin/sh
+#! @BUILD_SHEBANG@
 set -e
 
 # Run GRUB script in a Qemu instance

tests/grub_cmd_set_date.in

@@ -1,4 +1,4 @@
-#! /bin/sh
+#! @BUILD_SHEBANG@
 set -e
 
 . "@builddir@/grub-core/modinfo.sh"

tests/grub_cmd_sleep.in

@@ -1,4 +1,4 @@
-#! /bin/sh
+#! @BUILD_SHEBANG@
 set -e
 
 . "@builddir@/grub-core/modinfo.sh"

tests/grub_cmd_test.in

@@ -1,4 +1,4 @@
-#! /bin/sh
+#! @BUILD_SHEBANG@
 
 # create a randome file
 empty="`mktemp "${TMPDIR:-/tmp}/tmp.XXXXXXXXXX"`" || exit 1

tests/grub_cmd_tr.in

@@ -1,4 +1,4 @@
-#! /bin/sh -e
+#! @BUILD_SHEBANG@ -e
 
 # Run GRUB script in a Qemu instance
 # Copyright (C) 2010  Free Software Foundation, Inc.

tests/grub_func_test.in

@@ -1,4 +1,4 @@
-#! /bin/sh
+#! @BUILD_SHEBANG@
 set -e
 
 . "@builddir@/grub-core/modinfo.sh"

tests/grub_script_blanklines.in

@@ -1,4 +1,4 @@
-#! /bin/sh
+#! @BUILD_SHEBANG@
 set -e
 
 @builddir@/grub-script-check <<EOF

tests/grub_script_blockarg.in

@@ -1,4 +1,4 @@
-#! /bin/sh
+#! @BUILD_SHEBANG@
 
 # Run GRUB script in a Qemu instance
 # Copyright (C) 2010  Free Software Foundation, Inc.

tests/grub_script_dollar.in

@@ -1,4 +1,4 @@
-#! /bin/sh
+#! @BUILD_SHEBANG@
 set -e
 
 @builddir@/grub-script-check << EOF

tests/grub_script_expansion.in

@@ -1,4 +1,4 @@
-#! /bin/sh
+#! @BUILD_SHEBANG@
 set -e
 
 # Run GRUB script in a Qemu instance

tests/grub_script_final_semicolon.in

@@ -1,4 +1,4 @@
-#! /bin/sh
+#! @BUILD_SHEBANG@
 set -e
 
 @builddir@/grub-script-check <<EOF

tests/grub_script_no_commands.in

@@ -1,4 +1,4 @@
-#! /bin/sh
+#! @BUILD_SHEBANG@
 set -e
 
 # grub-script-check refuses to pass a file with no commands; this usually

tests/gzcompress_test.in

@@ -1,4 +1,4 @@
-#! /bin/sh
+#! @BUILD_SHEBANG@
 # Copyright (C) 2013  Free Software Foundation, Inc.
 #
 # GRUB is free software: you can redistribute it and/or modify

tests/hddboot_test.in

@@ -1,4 +1,4 @@
-#! /bin/sh
+#! @BUILD_SHEBANG@
 # Copyright (C) 2013  Free Software Foundation, Inc.
 #
 # GRUB is free software: you can redistribute it and/or modify

tests/help_test.in

@@ -1,4 +1,4 @@
-#! /bin/sh
+#! @BUILD_SHEBANG@
 set -e
 
 . "@builddir@/grub-core/modinfo.sh"

tests/hfs_test.in

@@ -1,4 +1,4 @@
-#!/bin/sh
+#!@BUILD_SHEBANG@
 
 set -e
 

tests/hfsplus_test.in

@@ -1,4 +1,4 @@
-#!/bin/sh
+#!@BUILD_SHEBANG@
 
 set -e
 

tests/iso9660_test.in

@@ -1,4 +1,4 @@
-#!/bin/sh
+#!@BUILD_SHEBANG@
 
 set -e
 

tests/jfs_test.in

@@ -1,4 +1,4 @@
-#!/bin/sh
+#!@BUILD_SHEBANG@
 
 set -e
 

tests/lzocompress_test.in

@@ -1,4 +1,4 @@
-#! /bin/sh
+#! @BUILD_SHEBANG@
 # Copyright (C) 2013  Free Software Foundation, Inc.
 #
 # GRUB is free software: you can redistribute it and/or modify

tests/minixfs_test.in

@@ -1,4 +1,4 @@
-#!/bin/sh
+#!@BUILD_SHEBANG@
 
 set -e
 

tests/netboot_test.in

@@ -1,4 +1,4 @@
-#! /bin/sh
+#! @BUILD_SHEBANG@
 # Copyright (C) 2013  Free Software Foundation, Inc.
 #
 # GRUB is free software: you can redistribute it and/or modify

tests/nilfs2_test.in

@@ -1,4 +1,4 @@
-#!/bin/sh
+#!@BUILD_SHEBANG@
 
 set -e
 

tests/ntfs_test.in

@@ -1,4 +1,4 @@
-#!/bin/sh
+#!@BUILD_SHEBANG@
 
 set -e
 

tests/ohci_test.in

@@ -1,4 +1,4 @@
-#! /bin/sh
+#! @BUILD_SHEBANG@
 # Copyright (C) 2013  Free Software Foundation, Inc.
 #
 # GRUB is free software: you can redistribute it and/or modify

tests/partmap_test.in

@@ -1,4 +1,4 @@
-#! /bin/sh
+#! @BUILD_SHEBANG@
 set -e
 
 # Copyright (C) 2010  Free Software Foundation, Inc.

tests/pata_test.in

@@ -1,4 +1,4 @@
-#! /bin/sh
+#! @BUILD_SHEBANG@
 # Copyright (C) 2013  Free Software Foundation, Inc.
 #
 # GRUB is free software: you can redistribute it and/or modify

tests/pseries_test.in

@@ -1,4 +1,4 @@
-#! /bin/sh
+#! @BUILD_SHEBANG@
 # Copyright (C) 2013  Free Software Foundation, Inc.
 #
 # GRUB is free software: you can redistribute it and/or modify

tests/reiserfs_test.in

@@ -1,4 +1,4 @@
-#!/bin/sh
+#!@BUILD_SHEBANG@
 
 set -e
 

tests/romfs_test.in

@@ -1,4 +1,4 @@
-#!/bin/sh
+#!@BUILD_SHEBANG@
 
 set -e
 

tests/squashfs_test.in

@@ -1,4 +1,4 @@
-#!/bin/sh
+#!@BUILD_SHEBANG@
 
 set -e
 

tests/syslinux_test.in

@@ -1,4 +1,4 @@
-#!/bin/sh
+#!@BUILD_SHEBANG@
 
 set -e
 

tests/tar_test.in

@@ -1,4 +1,4 @@
-#!/bin/sh
+#!@BUILD_SHEBANG@
 
 set -e
 

tests/test_sha512sum.in

@@ -1,4 +1,4 @@
-#! /bin/sh
+#! @BUILD_SHEBANG@
 
 # create a randome file
 file="`mktemp "${TMPDIR:-/tmp}/tmp.XXXXXXXXXX"`" || exit 1

tests/udf_test.in

@@ -1,4 +1,4 @@
-#!/bin/sh
+#!@BUILD_SHEBANG@
 
 set -e
 

tests/uhci_test.in

@@ -1,4 +1,4 @@
-#! /bin/sh
+#! @BUILD_SHEBANG@
 # Copyright (C) 2013  Free Software Foundation, Inc.
 #
 # GRUB is free software: you can redistribute it and/or modify

tests/util/grub-fs-tester.in

@@ -1,4 +1,4 @@
-#!/bin/sh
+#!@BUILD_SHEBANG@
 
 set -e
 

tests/util/grub-shell-tester.in

@@ -1,4 +1,4 @@
-#! /bin/sh
+#! @BUILD_SHEBANG@
 set -e
 
 # Compares GRUB script output with BASH output.

tests/util/grub-shell.in

@@ -1,4 +1,4 @@
-#! /bin/sh
+#! @BUILD_SHEBANG@
 set -e
 
 # Run GRUB script in a Qemu instance

tests/xfs_test.in

@@ -1,4 +1,4 @@
-#!/bin/sh
+#!@BUILD_SHEBANG@
 
 set -e
 

tests/xzcompress_test.in

@@ -1,4 +1,4 @@
-#! /bin/sh
+#! @BUILD_SHEBANG@
 # Copyright (C) 2013  Free Software Foundation, Inc.
 #
 # GRUB is free software: you can redistribute it and/or modify

tests/zfs_test.in

@@ -1,4 +1,4 @@
-#!/bin/sh
+#!@BUILD_SHEBANG@
 
 set -e