Add var/set_default_env and use it in all build scripts

projects/binutils/build

-#!/bin/sh
-set -e
-rootdir=$(pwd)
+#!/bin/bash
+[% c("var/set_default_env") -%]
 distdir=/var/tmp/dist/binutils
 [% IF c("var/linux") %]
   # Config options for hardening-wrapper

projects/clang/build

 #!/bin/bash
-set -e
+[% c("var/set_default_env") -%]
 tar xf [% project %]-[% c("version") %].tar.gz
 mv [% project %]-[% c("version") %] [% project %]
 [% c('tar', {

projects/cmake/build

 #!/bin/bash
-set -e
-rootdir=$(pwd)
+[% c("var/set_default_env") -%]
 distdir=/var/tmp/dist/[% project %]
 mkdir -p /var/tmp/build
 tar -C /var/tmp/build -xf [% project %]-[% c('version') %].tar.gz

projects/firefox-langpacks/build

 #!/bin/bash
-set -e
+[% c("var/set_default_env") -%]
 
 [% FOREACH lang = c('var/locales') %]
 [% SET lang = tmpl(lang) %]

projects/firefox/build

 #!/bin/bash
-set -e
-rootdir=$(pwd)
+[% c("var/set_default_env") -%]
 [% IF c("var/windows") -%]
   mkdir -p /var/tmp/dist
   tar -C /var/tmp/dist -xf $rootdir/[% c('input_files_by_name/gcc') %]
@@ -17,12 +16,6 @@ rootdir=$(pwd)
 distdir=/var/tmp/dist/[% project %]
 mkdir -p /var/tmp/build
 
-export SHELL=/bin/bash
-export HOME=$rootdir
-export TZ=UTC
-export LC_ALL=C
-umask 0022
-
 [% IF c("var/linux") %]
 tar xf $rootdir/[% c('input_files_by_name/binutils') %]
 export PATH="/var/tmp/dist/binutils/bin:$PATH"

projects/fonts/build

 #!/bin/bash
-set -e
-rootdir=$(pwd)
+[% c("var/set_default_env") -%]
 distdir=/var/tmp/dist/fonts
 mkdir -p $distdir
 tar xf [% project %]-[% c("version") %].tar.gz

projects/gcc/build

 #!/bin/sh
-set -e
+[% c("var/set_default_env") -%]
 distdir=/var/tmp/dist/[% project %]
 mkdir /var/tmp/build
 tar -C /var/tmp/build -xf [% project %]-[% c("version") %].tar.bz2

projects/gmp/build

 #!/bin/bash
-set -e
-rootdir=$(pwd)
+[% c("var/set_default_env") -%]
 [% pc(c('var/compiler'), 'var/setup', { compiler_tarfile => c('input_files_by_name/' _ c('var/compiler')) }) %]
 distdir=/var/tmp/dist/[% project %]
 mkdir -p /var/tmp/build

projects/go/build

 #!/bin/bash
-set -e
-rootdir=$(pwd)
+[% c("var/set_default_env") -%]
 distdir=/var/tmp/dist/[% project %]
 mkdir -p /var/tmp/dist
 

projects/go/config

@@ -20,8 +20,7 @@ var:
   # a list of install targets.
   build_go_lib: |
     #!/bin/bash
-    set -e
-    rootdir=$(pwd)
+    [% c("var/set_default_env") -%]
     [% pc('go', 'var/setup', { go_tarfile => c('input_files_by_name/go') }) %]
     distdir=/var/tmp/dist/[% project %]
     mkdir -p /var/tmp/build

projects/https-everywhere/build

-#!/bin/sh
-set -e
+#!/bin/bash
+[% c("var/set_default_env") -%]
 tar xf [% project %]-[% c('version') %].tar.gz
 cd [% project %]-[% c('version') %]
 # patch makexpi.sh because we don't have a git repository

projects/libdmg-hfsplus/build

-#!/bin/sh
-set -e
+#!/bin/bash
+[% c("var/set_default_env") -%]
 distdir=$(pwd)/dist
 mkdir -p $distdir/[% project %]
 tar xf [% project %]-[% c('version') %].tar.gz

projects/libevent/build

 #!/bin/bash
-set -e
-rootdir=$(pwd)
+[% c("var/set_default_env") -%]
 [% pc(c('var/compiler'), 'var/setup', { compiler_tarfile => c('input_files_by_name/' _ c('var/compiler')) }) %]
 distdir=/var/tmp/dist/[% project %]
 mkdir -p /var/tmp/build

projects/llvm/build

 #!/bin/bash
-set -e
-rootdir=$(pwd)
+[% c("var/set_default_env") -%]
 distdir=/var/tmp/dist/[% project %]
 mkdir -p /var/tmp/dist
 tar -C /var/tmp/dist -xf [% c('input_files_by_name/cmake') %]

projects/macosx-toolchain-gcc/build

 #!/bin/bash
-set -e
-rootdir=$(pwd)
+[% c("var/set_default_env") -%]
 destdir='[% dest_dir _ '/' _ c('filename') %]'
 mkdir -p "$destdir"
 mv -f [% c('input_files_by_name/SDK') %] "$destdir"/apple-uni-sdk.deb

projects/macosx-toolchain/build

-#!/bin/sh
-set -e
-rootdir=$(pwd)
+#!/bin/bash
+[% c("var/set_default_env") -%]
 distdir="/var/tmp/dist/[% project %]"
 mkdir -p "$distdir"
 tar xzf [% c('input_files_by_name/SDK') %]

projects/meek/build

 #!/bin/bash
-set -e
-rootdir=$(pwd)
+[% c("var/set_default_env") -%]
 [% pc('go', 'var/setup', { go_tarfile => c('input_files_by_name/go') }) %]
 distdir=/var/tmp/dist/[% project %]
 [% IF c("var/osx") %]

projects/mingw-w64/build

-#!/bin/sh
-set -e
-rootdir=$(pwd)
+#!/bin/bash
+[% c("var/set_default_env") -%]
 distdir=/var/tmp/dist/[% project %]
 
 mkdir /var/tmp/build

projects/nsis/build

-#!/bin/sh
-set -e
-rootdir=$(pwd)
+#!/bin/bash
+[% c("var/set_default_env") -%]
 [% pc(c('var/compiler'), 'var/setup', { compiler_tarfile => c('input_files_by_name/' _ c('var/compiler')) }) %]
 # remove hardening wrappers
 rm -Rf /var/tmp/dist/mingw-w64/helpers

projects/obfs4/build

 #!/bin/bash
-set -e
-rootdir=$(pwd)
+[% c("var/set_default_env") -%]
 [% pc('go', 'var/setup', { go_tarfile => c('input_files_by_name/go') }) %]
 distdir=/var/tmp/dist/[% project %]
 [% IF c("var/osx") %]