A script to build known versions of all shells we test against.

Right now they are the versions that come with Ubuntu 16.04.

test/spec.sh: If possible, use these hermetic shell binaries for spec
tests.

Addresses issue #42.

I'm not sure why, but I had to adjust two tests.

glob.test.sh:
  Upstream dash 0.5.8 also has the same bug as mksh.

  I'm not sure why the Ubuntu package, which is marked 0.5.8, doesn't
  have it.  Maybe they ported a patch over?

quote.test.sh:
  hermetic ash doesn't have this bug for some reason.

Also: the regex test is currently failing for ZSH because we're not
building with regex support.  To be fixed.

spec/glob.test.sh

@@ -199,6 +199,7 @@ echo [[z] []z]    # also accepted
 ## END
 
 #### Glob of negated unescaped [[] and []]
+# osh does this "correctly" because it defers to libc!
 touch $TMP/_G
 cd $TMP
 echo _[^\[z] _[^\]z]  # the right way to do it
@@ -207,7 +208,7 @@ echo _[^[z] _[^]z]    # also accepted
 _G _G
 _G _G
 ## END
-## BUG mksh STDOUT:
+## BUG dash/mksh STDOUT:
 _[^[z] _[^]z]
 _[^[z] _[^]z]
 ## END

spec/quote.test.sh

@@ -175,9 +175,6 @@ echo -n $'\001' $'\377' | od -A n -c | sed 's/ \+/ /g'
 ## N-I dash STDOUT:
  $ 001 $ 377
 ## END
-## BUG ash STDOUT:
- 001 0O7
-## END
 
 #### $'' octal escapes with fewer than 3 chars
 echo $'\1 \11 \11 \111' | od -A n -c | sed 's/ \+/ /g'

test/spec-bin.sh

@@ -0,0 +1,65 @@
+#!/bin/bash
+#
+# Build binaries for the spec tests.
+#
+# Usage:
+#   ./spec-bin.sh <function name>
+
+set -o nounset
+set -o pipefail
+set -o errexit
+
+readonly DIR=_tmp/spec-bin
+
+download() {
+  mkdir -p $DIR
+  wget --no-clobber --directory $DIR \
+    https://www.oilshell.org/blob/spec-bin/bash-4.3.tar.gz \
+    https://www.oilshell.org/blob/spec-bin/busybox-1.22.0.tar.bz2 \
+    https://www.oilshell.org/blob/spec-bin/dash-0.5.8.tar.gz \
+    https://www.oilshell.org/blob/spec-bin/mksh-R52c.tgz \
+    https://www.oilshell.org/blob/spec-bin/zsh-5.1.1.tar.xz
+}
+
+extract-all() {
+  pushd $DIR
+  for archive in *.tar.* *.tgz; do
+    echo $archive
+    tar --extract --file $archive
+  done
+  mv -v mksh mksh-R52c  # so it doesn't collide
+  popd
+}
+
+build-all() {
+  # bash/dash/zsh: ./configure; make
+  # mksh: sh Build.sh
+  # busybox: make defconfig (default config); make
+
+  pushd $DIR
+  # TODO: Are they all different?
+  popd
+}
+
+link-all() {
+  pushd $DIR
+  ln -s -f -v bash-4.3/bash .
+  ln -s -f -v dash-0.5.8/src/dash .
+  ln -s -f -v zsh-5.1.1/Src/zsh .
+  ln -s -f -v mksh-R52c/mksh .
+  ln -s -f -v busybox-1.22.0/busybox ./ash
+  popd
+}
+
+test-all() {
+  for sh in bash dash zsh mksh ash; do
+    $DIR/$sh -c 'echo "Hello from $0"'
+
+    # bash and zsh depend on libtinfo, but others don't
+    # ash and zsh depend on libm, but others don't
+    # bash and zsh depend on libdl, but others don't
+    ldd $DIR/$sh
+  done
+}
+
+"$@"

test/spec.sh

@@ -14,11 +14,26 @@ die() {
   exit 1
 }
 
-readonly DASH=$(which dash 2>/dev/null || echo /bin/sh)
-readonly BASH=$(which bash)
-readonly MKSH=$(which mksh)
-readonly ZSH=$(which zsh)
-readonly BUSYBOX_ASH=_tmp/shells/ash
+# For now, fall back to the shell in $PATH.
+shell-path() {
+  local name=$1
+  if test -f _tmp/spec-bin/$name; then
+    echo _tmp/spec-bin/$name
+  else
+    which $name
+  fi
+}
+
+readonly DASH=$(shell-path dash)
+readonly BASH=$(shell-path bash)
+readonly MKSH=$(shell-path mksh)
+readonly ZSH=$(shell-path zsh)
+
+if test -f _tmp/spec-bin/ash; then
+  readonly BUSYBOX_ASH=_tmp/spec-bin/ash
+else
+  readonly BUSYBOX_ASH=_tmp/shells/ash
+fi
 
 readonly OSH_PYTHON=${OSH_PYTHON:-bin/osh}
 readonly OSH_OVM=${OSH_OVM:-_bin/osh}