tests: fix test-patch.t on pickier /bin/sh implementations

FreeBSD sh(1) doesn't accept -d, so we weren't testing what we
expected there. Let's just use a simple Python script instead.

Differential Revision: https://phab.mercurial-scm.org/D3620

tests/test-patch.t

@@ -1,100 +1,105 b''
   $ cat > patchtool.py <<EOF
   > from __future__ import absolute_import, print_function
   > import sys
   > print('Using custom patch')
   > if '--binary' in sys.argv:
   >     print('--binary found !')
   > EOF
 
   $ echo "[ui]" >> $HGRCPATH
   $ echo "patch=$PYTHON ../patchtool.py" >> $HGRCPATH
 
   $ hg init a
   $ cd a
   $ echo a > a
   $ hg commit -Ama -d '1 0'
   adding a
   $ echo b >> a
   $ hg commit -Amb -d '2 0'
   $ cd ..
 
 This test checks that:
  - custom patch commands with arguments actually work
  - patch code does not try to add weird arguments like
  --binary when custom patch commands are used. For instance
  --binary is added by default under win32.
 
 check custom patch options are honored
 
   $ hg --cwd a export -o ../a.diff tip
   $ hg clone -r 0 a b
   adding changesets
   adding manifests
   adding file changes
   added 1 changesets with 1 changes to 1 files
   new changesets 8580ff50825a
   updating to branch default
   1 files updated, 0 files merged, 0 files removed, 0 files unresolved
 
   $ hg --cwd b import -v ../a.diff
   applying ../a.diff
   Using custom patch
   applied to working directory
 
 Issue2417: hg import with # comments in description
 
 Prepare source repo and patch:
 
   $ rm $HGRCPATH
   $ hg init c
   $ cd c
   $ printf "a\rc" > a
   $ hg ci -A -m 0 a -d '0 0'
   $ printf "a\rb\rc" > a
   $ cat << eof > log
   > first line which can't start with '# '
   > # second line is a comment but that shouldn't be a problem.
   > A patch marker like this was more problematic even after d7452292f9d3:
   > # HG changeset patch
   > # User lines looks like this - but it _is_ just a comment
   > eof
   $ hg ci -l log -d '0 0'
   $ hg export -o p 1
   $ cd ..
 
 Clone and apply patch:
 
   $ hg clone -r 0 c d
   adding changesets
   adding manifests
   adding file changes
   added 1 changesets with 1 changes to 1 files
   new changesets 7fadb901d403
   updating to branch default
   1 files updated, 0 files merged, 0 files removed, 0 files unresolved
   $ cd d
   $ hg import ../c/p
   applying ../c/p
   $ hg log -v -r 1
   changeset:   1:cd0bde79c428
   tag:         tip
   user:        test
   date:        Thu Jan 01 00:00:00 1970 +0000
   files:       a
   description:
   first line which can't start with '# '
   # second line is a comment but that shouldn't be a problem.
   A patch marker like this was more problematic even after d7452292f9d3:
   # HG changeset patch
   # User lines looks like this - but it _is_ just a comment
   
   
 
 Error exit (issue4746)
 
-  $ hg import ../c/p --config ui.patch='sh -c "exit 1"'
+  $ cat >> exit1.py <<EOF
+  > import sys
+  > sys.exit(1)
+  > EOF
+
+  $ hg import ../c/p --config ui.patch="$PYTHON '`pwd`/exit1.py'"
   applying ../c/p
   abort: patch command failed: exited with status 1
   [255]
 
   $ cd ..