tests: store protocol payload in files

tests: store protocol payload in files

Upcoming changes to version 2 of the SSH protocol will introduce
binary components to the protocol. It will be easier to eliminate
trailing newlines and use binary in the tests if the protocol
payload is being generated by Python.

So use inline Python to write payloads to files and pipe those files
to server processes instead of shell strings/variables.

Differential Revision: https://phab.mercurial-scm.org/D2381

--- a/tests/test-ssh-proto.t	Wed Feb 21 08:35:48 2018 -0800
+++ b/tests/test-ssh-proto.t	Mon Feb 19 13:20:17 2018 -0800
@@ -463,13 +463,14 @@
 
 Send an upgrade request to a server that supports upgrade
 
-  $ hg -R server serve --stdio << EOF
-  > upgrade this-is-some-token proto=exp-ssh-v2-0001
-  > hello
-  > between
-  > pairs 81
-  > 0000000000000000000000000000000000000000-0000000000000000000000000000000000000000
-  > EOF
+  >>> with open('payload', 'wb') as fh:
+  ...     fh.write(b'upgrade this-is-some-token proto=exp-ssh-v2-0001\n')
+  ...     fh.write(b'hello\n')
+  ...     fh.write(b'between\n')
+  ...     fh.write(b'pairs 81\n')
+  ...     fh.write(b'0000000000000000000000000000000000000000-0000000000000000000000000000000000000000')
+
+  $ hg -R server serve --stdio < payload
   upgraded this-is-some-token exp-ssh-v2-0001
   383
   capabilities: lookup changegroupsubset branchmap pushkey known getbundle unbundlehash batch streamreqs=generaldelta,revlogv1 $USUAL_BUNDLE2_CAPS_SERVER$ unbundle=HG10GZ,HG10BZ,HG10UN
@@ -540,13 +541,14 @@
 
 Command after upgrade to version 2 is processed
 
-  $ hg -R server serve --stdio << EOF
-  > upgrade this-is-some-token proto=exp-ssh-v2-0001
-  > hello
-  > between
-  > pairs 81
-  > 0000000000000000000000000000000000000000-0000000000000000000000000000000000000000hello
-  > EOF
+  >>> with open('payload', 'wb') as fh:
+  ...     fh.write(b'upgrade this-is-some-token proto=exp-ssh-v2-0001\n')
+  ...     fh.write(b'hello\n')
+  ...     fh.write(b'between\n')
+  ...     fh.write(b'pairs 81\n')
+  ...     fh.write(b'0000000000000000000000000000000000000000-0000000000000000000000000000000000000000')
+  ...     fh.write(b'hello\n')
+  $ hg -R server serve --stdio < payload
   upgraded this-is-some-token exp-ssh-v2-0001
   383
   capabilities: lookup changegroupsubset branchmap pushkey known getbundle unbundlehash batch streamreqs=generaldelta,revlogv1 $USUAL_BUNDLE2_CAPS_SERVER$ unbundle=HG10GZ,HG10BZ,HG10UN
@@ -555,14 +557,15 @@
 
 Multiple upgrades is not allowed
 
-  $ hg -R server serve --stdio << EOF
-  > upgrade this-is-some-token proto=exp-ssh-v2-0001
-  > hello
-  > between
-  > pairs 81
-  > 0000000000000000000000000000000000000000-0000000000000000000000000000000000000000upgrade another-token proto=irrelevant
-  > hello
-  > EOF
+  >>> with open('payload', 'wb') as fh:
+  ...     fh.write(b'upgrade this-is-some-token proto=exp-ssh-v2-0001\n')
+  ...     fh.write(b'hello\n')
+  ...     fh.write(b'between\n')
+  ...     fh.write(b'pairs 81\n')
+  ...     fh.write(b'0000000000000000000000000000000000000000-0000000000000000000000000000000000000000')
+  ...     fh.write(b'upgrade another-token proto=irrelevant\n')
+  ...     fh.write(b'hello\n')
+  $ hg -R server serve --stdio < payload
   upgraded this-is-some-token exp-ssh-v2-0001
   383
   capabilities: lookup changegroupsubset branchmap pushkey known getbundle unbundlehash batch streamreqs=generaldelta,revlogv1 $USUAL_BUNDLE2_CAPS_SERVER$ unbundle=HG10GZ,HG10BZ,HG10UN