tests: quote $PYTHON for Windows

When unquoted, MSYS sees the colon between the drive letter and path as a Unix
path separator and unhelpfully splits on it, feeding only the drive letter as
the command.  Much chaos ensues.

I vaguely remember trying to get the test runner to use /letter/path/to/exe
syntax the last time this happened, without success.  I doubt a check-code rule
would work, since sometimes it is quoted, and sometimes the quotes are escaped.

tests/test-bundle2-exchange.t

@@ -18,7 +18,7 b' enable obsolescence'
   > evolution=createmarkers,exchange
   > bundle2-output-capture=True
   > [ui]
-  > ssh=$PYTHON "$TESTDIR/dummyssh"
+  > ssh="$PYTHON" "$TESTDIR/dummyssh"
   > logtemplate={rev}:{node|short} {phase} {author} {bookmarks} {desc|firstline}
   > [web]
   > push_ssl = false
@@ -909,7 +909,7 b' Test lazily acquiring the lock during un'
   $ cp $TESTTMP/hgrc.orig $HGRCPATH
   $ cat >> $HGRCPATH <<EOF
   > [ui]
-  > ssh=$PYTHON "$TESTDIR/dummyssh"
+  > ssh="$PYTHON" "$TESTDIR/dummyssh"
   > EOF
 
   $ cat >> $TESTTMP/locktester.py <<EOF

tests/test-clone.t

@@ -1044,7 +1044,7 b" Test that auto sharing doesn't cause fai"
   $ hg id -R remote -r 0
   abort: repository remote not found!
   [255]
-  $ hg --config share.pool=share -q clone -e "$PYTHON \"$TESTDIR/dummyssh\"" a ssh://user@dummy/remote
+  $ hg --config share.pool=share -q clone -e "\"$PYTHON\" \"$TESTDIR/dummyssh\"" a ssh://user@dummy/remote
   $ hg -R remote id -r 0
   acb14030fe0a
 

tests/test-clonebundles.t

@@ -69,7 +69,7 b' Server is not running aborts'
 
 Server returns 404
 
-  $ $PYTHON $TESTDIR/dumbhttp.py -p $HGPORT1 --pid http.pid
+  $ "$PYTHON" $TESTDIR/dumbhttp.py -p $HGPORT1 --pid http.pid
   $ cat http.pid >> $DAEMON_PIDS
   $ hg clone http://localhost:$HGPORT running-404
   applying clone bundle from http://localhost:$HGPORT1/bundle.hg
@@ -197,7 +197,7 b' by old clients.'
 
 Feature works over SSH
 
-  $ hg clone -U -e "$PYTHON \"$TESTDIR/dummyssh\"" ssh://user@dummy/server ssh-full-clone
+  $ hg clone -U -e "\"$PYTHON\" \"$TESTDIR/dummyssh\"" ssh://user@dummy/server ssh-full-clone
   applying clone bundle from http://localhost:$HGPORT1/full.hg
   adding changesets
   adding manifests

tests/test-http-branchmap.t

@@ -87,7 +87,7 b' verify 7e7d56fe4833 (encoding fallback i'
   > EOF
   $ echo baz >> b/foo
   $ hg -R b ci -m baz
-  $ hg push -R b -e '$PYTHON oldhg' ssh://dummy/ --encoding latin1
+  $ hg push -R b -e "\"$PYTHON\" oldhg" ssh://dummy/ --encoding latin1
   pushing to ssh://dummy/
   searching for changes
   remote: adding changesets

tests/test-init.t

@@ -106,7 +106,7 b' test failure'
 
 init+push to remote2
 
-  $ hg init -e "$PYTHON \"$TESTDIR/dummyssh\"" ssh://user@dummy/remote2
+  $ hg init -e "\"$PYTHON\" \"$TESTDIR/dummyssh\"" ssh://user@dummy/remote2
   $ hg incoming -R remote2 local
   comparing with local
   changeset:   0:08b9e9f63b32
@@ -116,7 +116,7 b' init+push to remote2'
   summary:     init
   
 
-  $ hg push -R local -e "$PYTHON \"$TESTDIR/dummyssh\"" ssh://user@dummy/remote2
+  $ hg push -R local -e "\"$PYTHON\" \"$TESTDIR/dummyssh\"" ssh://user@dummy/remote2
   pushing to ssh://user@dummy/remote2
   searching for changes
   remote: adding changesets
@@ -126,7 +126,7 b' init+push to remote2'
 
 clone to remote1
 
-  $ hg clone -e "$PYTHON \"$TESTDIR/dummyssh\"" local ssh://user@dummy/remote1
+  $ hg clone -e "\"$PYTHON\" \"$TESTDIR/dummyssh\"" local ssh://user@dummy/remote1
   searching for changes
   remote: adding changesets
   remote: adding manifests
@@ -134,7 +134,7 b' clone to remote1'
   remote: added 1 changesets with 1 changes to 1 files
 
 The largefiles extension doesn't crash
-  $ hg clone -e "$PYTHON \"$TESTDIR/dummyssh\"" local ssh://user@dummy/remotelf --config extensions.largefiles=
+  $ hg clone -e "\"$PYTHON\" \"$TESTDIR/dummyssh\"" local ssh://user@dummy/remotelf --config extensions.largefiles=
   The fsmonitor extension is incompatible with the largefiles extension and has been disabled. (fsmonitor !)
   The fsmonitor extension is incompatible with the largefiles extension and has been disabled. (fsmonitor !)
   searching for changes
@@ -145,14 +145,14 b" The largefiles extension doesn't crash"
 
 init to existing repo
 
-  $ hg init -e "$PYTHON \"$TESTDIR/dummyssh\"" ssh://user@dummy/remote1
+  $ hg init -e "\"$PYTHON\" \"$TESTDIR/dummyssh\"" ssh://user@dummy/remote1
   abort: repository remote1 already exists!
   abort: could not create remote repo!
   [255]
 
 clone to existing repo
 
-  $ hg clone -e "$PYTHON \"$TESTDIR/dummyssh\"" local ssh://user@dummy/remote1
+  $ hg clone -e "\"$PYTHON\" \"$TESTDIR/dummyssh\"" local ssh://user@dummy/remote1
   abort: repository remote1 already exists!
   abort: could not create remote repo!
   [255]
@@ -251,7 +251,7 b' clone bookmarks'
   $ hg -R local bookmark test
   $ hg -R local bookmarks
    * test                      0:08b9e9f63b32
-  $ hg clone -e "$PYTHON \"$TESTDIR/dummyssh\"" local ssh://user@dummy/remote-bookmarks
+  $ hg clone -e "\"$PYTHON\" \"$TESTDIR/dummyssh\"" local ssh://user@dummy/remote-bookmarks
   searching for changes
   remote: adding changesets
   remote: adding manifests

tests/test-largefiles-wireproto.t

@@ -112,7 +112,7 b' used all HGPORTs, kill all daemons'
 #endif
 
 vanilla clients locked out from largefiles ssh repos
-  $ hg --config extensions.largefiles=! clone -e "$PYTHON \"$TESTDIR/dummyssh\"" ssh://user@dummy/r4 r5
+  $ hg --config extensions.largefiles=! clone -e "\"$PYTHON\" \"$TESTDIR/dummyssh\"" ssh://user@dummy/r4 r5
   remote: 
   remote: This repository uses the largefiles extension.
   remote: 

tests/test-ssh-bundle1.t

@@ -44,21 +44,21 b' configure for serving'
 
 repo not found error
 
-  $ hg clone -e "$PYTHON \"$TESTDIR/dummyssh\"" ssh://user@dummy/nonexistent local
+  $ hg clone -e "\"$PYTHON\" \"$TESTDIR/dummyssh\"" ssh://user@dummy/nonexistent local
   remote: abort: repository nonexistent not found!
   abort: no suitable response from remote hg!
   [255]
 
 non-existent absolute path
 
-  $ hg clone -e "$PYTHON \"$TESTDIR/dummyssh\"" ssh://user@dummy//`pwd`/nonexistent local
+  $ hg clone -e "\"$PYTHON\" \"$TESTDIR/dummyssh\"" ssh://user@dummy//`pwd`/nonexistent local
   remote: abort: repository /$TESTTMP/nonexistent not found!
   abort: no suitable response from remote hg!
   [255]
 
 clone remote via stream
 
-  $ hg clone -e "$PYTHON \"$TESTDIR/dummyssh\"" --uncompressed ssh://user@dummy/remote local-stream
+  $ hg clone -e "\"$PYTHON\" \"$TESTDIR/dummyssh\"" --uncompressed ssh://user@dummy/remote local-stream
   streaming all changes
   4 files to transfer, 602 bytes of data
   transferred 602 bytes in * seconds (*) (glob)
@@ -80,7 +80,7 b' clone remote via stream'
 clone bookmarks via stream
 
   $ hg -R local-stream book mybook
-  $ hg clone -e "$PYTHON \"$TESTDIR/dummyssh\"" --uncompressed ssh://user@dummy/local-stream stream2
+  $ hg clone -e "\"$PYTHON\" \"$TESTDIR/dummyssh\"" --uncompressed ssh://user@dummy/local-stream stream2
   streaming all changes
   4 files to transfer, 602 bytes of data
   transferred 602 bytes in * seconds (*) (glob)
@@ -96,7 +96,7 b' clone bookmarks via stream'
 
 clone remote via pull
 
-  $ hg clone -e "$PYTHON \"$TESTDIR/dummyssh\"" ssh://user@dummy/remote local
+  $ hg clone -e "\"$PYTHON\" \"$TESTDIR/dummyssh\"" ssh://user@dummy/remote local
   requesting all changes
   adding changesets
   adding manifests
@@ -123,14 +123,14 b' empty default pull'
 
   $ hg paths
   default = ssh://user@dummy/remote
-  $ hg pull -e "$PYTHON \"$TESTDIR/dummyssh\""
+  $ hg pull -e "\"$PYTHON\" \"$TESTDIR/dummyssh\""
   pulling from ssh://user@dummy/remote
   searching for changes
   no changes found
 
 pull from wrong ssh URL
 
-  $ hg pull -e "$PYTHON \"$TESTDIR/dummyssh\"" ssh://user@dummy/doesnotexist
+  $ hg pull -e "\"$PYTHON\" \"$TESTDIR/dummyssh\"" ssh://user@dummy/doesnotexist
   pulling from ssh://user@dummy/doesnotexist
   remote: abort: repository doesnotexist not found!
   abort: no suitable response from remote hg!
@@ -145,7 +145,7 b' updating rc'
 
   $ echo "default-push = ssh://user@dummy/remote" >> .hg/hgrc
   $ echo "[ui]" >> .hg/hgrc
-  $ echo "ssh = $PYTHON \"$TESTDIR/dummyssh\"" >> .hg/hgrc
+  $ echo "ssh = \"$PYTHON\" \"$TESTDIR/dummyssh\"" >> .hg/hgrc
 
 find outgoing
 
@@ -162,7 +162,7 b' find outgoing'
 
 find incoming on the remote side
 
-  $ hg incoming -R ../remote -e "$PYTHON \"$TESTDIR/dummyssh\"" ssh://user@dummy/local
+  $ hg incoming -R ../remote -e "\"$PYTHON\" \"$TESTDIR/dummyssh\"" ssh://user@dummy/local
   comparing with ssh://user@dummy/local
   searching for changes
   changeset:   3:a28a9d1a809c
@@ -175,7 +175,7 b' find incoming on the remote side'
 
 find incoming on the remote side (using absolute path)
 
-  $ hg incoming -R ../remote -e "$PYTHON \"$TESTDIR/dummyssh\"" "ssh://user@dummy/`pwd`"
+  $ hg incoming -R ../remote -e "\"$PYTHON\" \"$TESTDIR/dummyssh\"" "ssh://user@dummy/`pwd`"
   comparing with ssh://user@dummy/$TESTTMP/local
   searching for changes
   changeset:   3:a28a9d1a809c
@@ -222,7 +222,7 b' check remote tip'
 test pushkeys and bookmarks
 
   $ cd ../local
-  $ hg debugpushkey --config ui.ssh="$PYTHON \"$TESTDIR/dummyssh\"" ssh://user@dummy/remote namespaces
+  $ hg debugpushkey --config ui.ssh="\"$PYTHON\" \"$TESTDIR/dummyssh\"" ssh://user@dummy/remote namespaces
   bookmarks	
   namespaces	
   phases	
@@ -237,7 +237,7 b' test pushkeys and bookmarks'
   no changes found
   exporting bookmark foo
   [1]
-  $ hg debugpushkey --config ui.ssh="$PYTHON \"$TESTDIR/dummyssh\"" ssh://user@dummy/remote bookmarks
+  $ hg debugpushkey --config ui.ssh="\"$PYTHON\" \"$TESTDIR/dummyssh\"" ssh://user@dummy/remote bookmarks
   foo	1160648e36cec0054048a7edc4110c6f84fde594
   $ hg book -f foo
   $ hg push --traceback
@@ -272,7 +272,7 b' a bad, evil hook that prints to stdout'
   > EOF
 
   $ echo '[hooks]' >> ../remote/.hg/hgrc
-  $ echo "changegroup.stdout = $PYTHON $TESTTMP/badhook" >> ../remote/.hg/hgrc
+  $ echo "changegroup.stdout = \"$PYTHON\" $TESTTMP/badhook" >> ../remote/.hg/hgrc
   $ echo r > r
   $ hg ci -A -m z r
 
@@ -307,7 +307,7 b' clone bookmarks'
   $ hg -R ../remote bookmark test
   $ hg -R ../remote bookmarks
    * test                      4:6c0482d977a3
-  $ hg clone -e "$PYTHON \"$TESTDIR/dummyssh\"" ssh://user@dummy/remote local-bookmarks
+  $ hg clone -e "\"$PYTHON\" \"$TESTDIR/dummyssh\"" ssh://user@dummy/remote local-bookmarks
   requesting all changes
   adding changesets
   adding manifests
@@ -334,21 +334,21 b' hide outer repo'
 
 Test remote paths with spaces (issue2983):
 
-  $ hg init --ssh "$PYTHON \"$TESTDIR/dummyssh\"" "ssh://user@dummy/a repo"
+  $ hg init --ssh "\"$PYTHON\" \"$TESTDIR/dummyssh\"" "ssh://user@dummy/a repo"
   $ touch "$TESTTMP/a repo/test"
   $ hg -R 'a repo' commit -A -m "test"
   adding test
   $ hg -R 'a repo' tag tag
-  $ hg id --ssh "$PYTHON \"$TESTDIR/dummyssh\"" "ssh://user@dummy/a repo"
+  $ hg id --ssh "\"$PYTHON\" \"$TESTDIR/dummyssh\"" "ssh://user@dummy/a repo"
   73649e48688a
 
-  $ hg id --ssh "$PYTHON \"$TESTDIR/dummyssh\"" "ssh://user@dummy/a repo#noNoNO"
+  $ hg id --ssh "\"$PYTHON\" \"$TESTDIR/dummyssh\"" "ssh://user@dummy/a repo#noNoNO"
   abort: unknown revision 'noNoNO'!
   [255]
 
 Test (non-)escaping of remote paths with spaces when cloning (issue3145):
 
-  $ hg clone --ssh "$PYTHON \"$TESTDIR/dummyssh\"" "ssh://user@dummy/a repo"
+  $ hg clone --ssh "\"$PYTHON\" \"$TESTDIR/dummyssh\"" "ssh://user@dummy/a repo"
   destination directory: a repo
   abort: destination 'a repo' is not empty
   [255]
@@ -363,7 +363,7 b' parameters:'
   > export SSH_ORIGINAL_COMMAND
   > PYTHONPATH="$PYTHONPATH"
   > export PYTHONPATH
-  > $PYTHON "$TESTDIR/../contrib/hg-ssh" "$TESTTMP/a repo"
+  > "$PYTHON" "$TESTDIR/../contrib/hg-ssh" "$TESTTMP/a repo"
   > EOF
 
   $ hg id --ssh "sh ssh.sh" "ssh://user@dummy/a repo"
@@ -391,7 +391,7 b' Test hg-ssh in read-only mode:'
   > export SSH_ORIGINAL_COMMAND
   > PYTHONPATH="$PYTHONPATH"
   > export PYTHONPATH
-  > $PYTHON "$TESTDIR/../contrib/hg-ssh" --read-only "$TESTTMP/remote"
+  > "$PYTHON" "$TESTDIR/../contrib/hg-ssh" --read-only "$TESTTMP/remote"
   > EOF
 
   $ hg clone --ssh "sh ssh.sh" "ssh://user@dummy/$TESTTMP/remote" read-only-local
@@ -440,7 +440,7 b' stderr from remote commands should be pr'
   > [paths]
   > default-push = ssh://user@dummy/remote
   > [ui]
-  > ssh = $PYTHON "$TESTDIR/dummyssh"
+  > ssh = "$PYTHON" "$TESTDIR/dummyssh"
   > [extensions]
   > localwrite = localwrite.py
   > EOF
@@ -526,11 +526,11 b' remote hook failure is attributed to rem'
 
   $ echo "pretxnchangegroup.fail = python:$TESTTMP/failhook:hook" >> remote/.hg/hgrc
 
-  $ hg -q --config ui.ssh="$PYTHON $TESTDIR/dummyssh" clone ssh://user@dummy/remote hookout
+  $ hg -q --config ui.ssh="\"$PYTHON\" $TESTDIR/dummyssh" clone ssh://user@dummy/remote hookout
   $ cd hookout
   $ touch hookfailure
   $ hg -q commit -A -m 'remote hook failure'
-  $ hg --config ui.ssh="$PYTHON $TESTDIR/dummyssh" push
+  $ hg --config ui.ssh="\"$PYTHON\" $TESTDIR/dummyssh" push
   pushing to ssh://user@dummy/remote
   searching for changes
   remote: adding changesets
@@ -551,7 +551,7 b' abort during pull is properly reported a'
   > [extensions]
   > crash = ${TESTDIR}/crashgetbundler.py
   > EOF
-  $ hg --config ui.ssh="$PYTHON $TESTDIR/dummyssh" pull
+  $ hg --config ui.ssh="\"$PYTHON\" $TESTDIR/dummyssh" pull
   pulling from ssh://user@dummy/remote
   searching for changes
   adding changesets

tests/test-ssh-clone-r.t

@@ -17,7 +17,7 b" creating 'remote' repo"
 clone remote via stream
 
   $ for i in 0 1 2 3 4 5 6 7 8; do
-  >    hg clone -e "$PYTHON \"$TESTDIR/dummyssh\"" --uncompressed -r "$i" ssh://user@dummy/remote test-"$i"
+  >    hg clone -e "\"$PYTHON\" \"$TESTDIR/dummyssh\"" --uncompressed -r "$i" ssh://user@dummy/remote test-"$i"
   >    if cd test-"$i"; then
   >       hg verify
   >       cd ..
@@ -139,7 +139,7 b' clone remote via stream'
   4 files, 9 changesets, 7 total revisions
   $ cd ..
   $ cd test-1
-  $ hg pull -e "$PYTHON \"$TESTDIR/dummyssh\"" -r 4 ssh://user@dummy/remote
+  $ hg pull -e "\"$PYTHON\" \"$TESTDIR/dummyssh\"" -r 4 ssh://user@dummy/remote
   pulling from ssh://user@dummy/remote
   searching for changes
   adding changesets
@@ -153,7 +153,7 b' clone remote via stream'
   crosschecking files in changesets and manifests
   checking files
   1 files, 3 changesets, 2 total revisions
-  $ hg pull -e "$PYTHON \"$TESTDIR/dummyssh\"" ssh://user@dummy/remote
+  $ hg pull -e "\"$PYTHON\" \"$TESTDIR/dummyssh\"" ssh://user@dummy/remote
   pulling from ssh://user@dummy/remote
   searching for changes
   adding changesets
@@ -163,7 +163,7 b' clone remote via stream'
   (run 'hg update' to get a working copy)
   $ cd ..
   $ cd test-2
-  $ hg pull -e "$PYTHON \"$TESTDIR/dummyssh\"" -r 5 ssh://user@dummy/remote
+  $ hg pull -e "\"$PYTHON\" \"$TESTDIR/dummyssh\"" -r 5 ssh://user@dummy/remote
   pulling from ssh://user@dummy/remote
   searching for changes
   adding changesets
@@ -177,7 +177,7 b' clone remote via stream'
   crosschecking files in changesets and manifests
   checking files
   1 files, 5 changesets, 3 total revisions
-  $ hg pull -e "$PYTHON \"$TESTDIR/dummyssh\"" ssh://user@dummy/remote
+  $ hg pull -e "\"$PYTHON\" \"$TESTDIR/dummyssh\"" ssh://user@dummy/remote
   pulling from ssh://user@dummy/remote
   searching for changes
   adding changesets

tests/test-ssh.t

@@ -38,21 +38,21 b' configure for serving'
 
 repo not found error
 
-  $ hg clone -e "$PYTHON \"$TESTDIR/dummyssh\"" ssh://user@dummy/nonexistent local
+  $ hg clone -e "\"$PYTHON\" \"$TESTDIR/dummyssh\"" ssh://user@dummy/nonexistent local
   remote: abort: repository nonexistent not found!
   abort: no suitable response from remote hg!
   [255]
 
 non-existent absolute path
 
-  $ hg clone -e "$PYTHON \"$TESTDIR/dummyssh\"" ssh://user@dummy/`pwd`/nonexistent local
+  $ hg clone -e "\"$PYTHON\" \"$TESTDIR/dummyssh\"" ssh://user@dummy/`pwd`/nonexistent local
   remote: abort: repository $TESTTMP/nonexistent not found!
   abort: no suitable response from remote hg!
   [255]
 
 clone remote via stream
 
-  $ hg clone -e "$PYTHON \"$TESTDIR/dummyssh\"" --uncompressed ssh://user@dummy/remote local-stream
+  $ hg clone -e "\"$PYTHON\" \"$TESTDIR/dummyssh\"" --uncompressed ssh://user@dummy/remote local-stream
   streaming all changes
   4 files to transfer, 602 bytes of data
   transferred 602 bytes in * seconds (*) (glob)
@@ -74,7 +74,7 b' clone remote via stream'
 clone bookmarks via stream
 
   $ hg -R local-stream book mybook
-  $ hg clone -e "$PYTHON \"$TESTDIR/dummyssh\"" --uncompressed ssh://user@dummy/local-stream stream2
+  $ hg clone -e "\"$PYTHON\" \"$TESTDIR/dummyssh\"" --uncompressed ssh://user@dummy/local-stream stream2
   streaming all changes
   4 files to transfer, 602 bytes of data
   transferred 602 bytes in * seconds (*) (glob)
@@ -90,7 +90,7 b' clone bookmarks via stream'
 
 clone remote via pull
 
-  $ hg clone -e "$PYTHON \"$TESTDIR/dummyssh\"" ssh://user@dummy/remote local
+  $ hg clone -e "\"$PYTHON\" \"$TESTDIR/dummyssh\"" ssh://user@dummy/remote local
   requesting all changes
   adding changesets
   adding manifests
@@ -117,14 +117,14 b' empty default pull'
 
   $ hg paths
   default = ssh://user@dummy/remote
-  $ hg pull -e "$PYTHON \"$TESTDIR/dummyssh\""
+  $ hg pull -e "\"$PYTHON\" \"$TESTDIR/dummyssh\""
   pulling from ssh://user@dummy/remote
   searching for changes
   no changes found
 
 pull from wrong ssh URL
 
-  $ hg pull -e "$PYTHON \"$TESTDIR/dummyssh\"" ssh://user@dummy/doesnotexist
+  $ hg pull -e "\"$PYTHON\" \"$TESTDIR/dummyssh\"" ssh://user@dummy/doesnotexist
   pulling from ssh://user@dummy/doesnotexist
   remote: abort: repository doesnotexist not found!
   abort: no suitable response from remote hg!
@@ -139,7 +139,7 b' updating rc'
 
   $ echo "default-push = ssh://user@dummy/remote" >> .hg/hgrc
   $ echo "[ui]" >> .hg/hgrc
-  $ echo "ssh = $PYTHON \"$TESTDIR/dummyssh\"" >> .hg/hgrc
+  $ echo "ssh = \"$PYTHON\" \"$TESTDIR/dummyssh\"" >> .hg/hgrc
 
 find outgoing
 
@@ -156,7 +156,7 b' find outgoing'
 
 find incoming on the remote side
 
-  $ hg incoming -R ../remote -e "$PYTHON \"$TESTDIR/dummyssh\"" ssh://user@dummy/local
+  $ hg incoming -R ../remote -e "\"$PYTHON\" \"$TESTDIR/dummyssh\"" ssh://user@dummy/local
   comparing with ssh://user@dummy/local
   searching for changes
   changeset:   3:a28a9d1a809c
@@ -169,7 +169,7 b' find incoming on the remote side'
 
 find incoming on the remote side (using absolute path)
 
-  $ hg incoming -R ../remote -e "$PYTHON \"$TESTDIR/dummyssh\"" "ssh://user@dummy/`pwd`"
+  $ hg incoming -R ../remote -e "\"$PYTHON\" \"$TESTDIR/dummyssh\"" "ssh://user@dummy/`pwd`"
   comparing with ssh://user@dummy/$TESTTMP/local
   searching for changes
   changeset:   3:a28a9d1a809c
@@ -216,7 +216,7 b' check remote tip'
 test pushkeys and bookmarks
 
   $ cd ../local
-  $ hg debugpushkey --config ui.ssh="$PYTHON \"$TESTDIR/dummyssh\"" ssh://user@dummy/remote namespaces
+  $ hg debugpushkey --config ui.ssh="\"$PYTHON\" \"$TESTDIR/dummyssh\"" ssh://user@dummy/remote namespaces
   bookmarks	
   namespaces	
   phases	
@@ -231,7 +231,7 b' test pushkeys and bookmarks'
   no changes found
   exporting bookmark foo
   [1]
-  $ hg debugpushkey --config ui.ssh="$PYTHON \"$TESTDIR/dummyssh\"" ssh://user@dummy/remote bookmarks
+  $ hg debugpushkey --config ui.ssh="\"$PYTHON\" \"$TESTDIR/dummyssh\"" ssh://user@dummy/remote bookmarks
   foo	1160648e36cec0054048a7edc4110c6f84fde594
   $ hg book -f foo
   $ hg push --traceback
@@ -311,7 +311,7 b' clone bookmarks'
   $ hg -R ../remote bookmark test
   $ hg -R ../remote bookmarks
    * test                      4:6c0482d977a3
-  $ hg clone -e "$PYTHON \"$TESTDIR/dummyssh\"" ssh://user@dummy/remote local-bookmarks
+  $ hg clone -e "\"$PYTHON\" \"$TESTDIR/dummyssh\"" ssh://user@dummy/remote local-bookmarks
   requesting all changes
   adding changesets
   adding manifests
@@ -338,21 +338,21 b' hide outer repo'
 
 Test remote paths with spaces (issue2983):
 
-  $ hg init --ssh "$PYTHON \"$TESTDIR/dummyssh\"" "ssh://user@dummy/a repo"
+  $ hg init --ssh "\"$PYTHON\" \"$TESTDIR/dummyssh\"" "ssh://user@dummy/a repo"
   $ touch "$TESTTMP/a repo/test"
   $ hg -R 'a repo' commit -A -m "test"
   adding test
   $ hg -R 'a repo' tag tag
-  $ hg id --ssh "$PYTHON \"$TESTDIR/dummyssh\"" "ssh://user@dummy/a repo"
+  $ hg id --ssh "\"$PYTHON\" \"$TESTDIR/dummyssh\"" "ssh://user@dummy/a repo"
   73649e48688a
 
-  $ hg id --ssh "$PYTHON \"$TESTDIR/dummyssh\"" "ssh://user@dummy/a repo#noNoNO"
+  $ hg id --ssh "\"$PYTHON\" \"$TESTDIR/dummyssh\"" "ssh://user@dummy/a repo#noNoNO"
   abort: unknown revision 'noNoNO'!
   [255]
 
 Test (non-)escaping of remote paths with spaces when cloning (issue3145):
 
-  $ hg clone --ssh "$PYTHON \"$TESTDIR/dummyssh\"" "ssh://user@dummy/a repo"
+  $ hg clone --ssh "\"$PYTHON\" \"$TESTDIR/dummyssh\"" "ssh://user@dummy/a repo"
   destination directory: a repo
   abort: destination 'a repo' is not empty
   [255]
@@ -380,7 +380,7 b' parameters:'
   > export SSH_ORIGINAL_COMMAND
   > PYTHONPATH="$PYTHONPATH"
   > export PYTHONPATH
-  > $PYTHON "$TESTDIR/../contrib/hg-ssh" "$TESTTMP/a repo"
+  > "$PYTHON" "$TESTDIR/../contrib/hg-ssh" "$TESTTMP/a repo"
   > EOF
 
   $ hg id --ssh "sh ssh.sh" "ssh://user@dummy/a repo"
@@ -408,7 +408,7 b' Test hg-ssh in read-only mode:'
   > export SSH_ORIGINAL_COMMAND
   > PYTHONPATH="$PYTHONPATH"
   > export PYTHONPATH
-  > $PYTHON "$TESTDIR/../contrib/hg-ssh" --read-only "$TESTTMP/remote"
+  > "$PYTHON" "$TESTDIR/../contrib/hg-ssh" --read-only "$TESTTMP/remote"
   > EOF
 
   $ hg clone --ssh "sh ssh.sh" "ssh://user@dummy/$TESTTMP/remote" read-only-local
@@ -455,7 +455,7 b' stderr from remote commands should be pr'
   > [paths]
   > default-push = ssh://user@dummy/remote
   > [ui]
-  > ssh = $PYTHON "$TESTDIR/dummyssh"
+  > ssh = "$PYTHON" "$TESTDIR/dummyssh"
   > [extensions]
   > localwrite = localwrite.py
   > EOF
@@ -543,11 +543,11 b' remote hook failure is attributed to rem'
 
   $ echo "pretxnchangegroup.fail = python:$TESTTMP/failhook:hook" >> remote/.hg/hgrc
 
-  $ hg -q --config ui.ssh="$PYTHON $TESTDIR/dummyssh" clone ssh://user@dummy/remote hookout
+  $ hg -q --config ui.ssh="\"$PYTHON\" $TESTDIR/dummyssh" clone ssh://user@dummy/remote hookout
   $ cd hookout
   $ touch hookfailure
   $ hg -q commit -A -m 'remote hook failure'
-  $ hg --config ui.ssh="$PYTHON $TESTDIR/dummyssh" push
+  $ hg --config ui.ssh="\"$PYTHON\" $TESTDIR/dummyssh" push
   pushing to ssh://user@dummy/remote
   searching for changes
   remote: adding changesets
@@ -569,7 +569,7 b' abort during pull is properly reported a'
   > [extensions]
   > crash = ${TESTDIR}/crashgetbundler.py
   > EOF
-  $ hg --config ui.ssh="$PYTHON $TESTDIR/dummyssh" pull
+  $ hg --config ui.ssh="\"$PYTHON\" $TESTDIR/dummyssh" pull
   pulling from ssh://user@dummy/remote
   searching for changes
   remote: abort: this is an exercise

tests/test-subrepo-relative-path.t

@@ -74,7 +74,7 b" subrepo debug for 'main' clone"
 
 subrepo paths with ssh urls
 
-  $ hg clone -e "$PYTHON \"$TESTDIR/dummyssh\"" ssh://user@dummy/cloned sshclone
+  $ hg clone -e "\"$PYTHON\" \"$TESTDIR/dummyssh\"" ssh://user@dummy/cloned sshclone
   requesting all changes
   adding changesets
   adding manifests
@@ -89,7 +89,7 b' subrepo paths with ssh urls'
   added 1 changesets with 1 changes to 1 files
   3 files updated, 0 files merged, 0 files removed, 0 files unresolved
 
-  $ hg -R sshclone push -e "$PYTHON \"$TESTDIR/dummyssh\"" ssh://user@dummy/`pwd`/cloned
+  $ hg -R sshclone push -e "\"$PYTHON\" \"$TESTDIR/dummyssh\"" ssh://user@dummy/`pwd`/cloned
   pushing to ssh://user@dummy/$TESTTMP/cloned
   pushing subrepo sub to ssh://user@dummy/$TESTTMP/sub
   searching for changes

tests/test-wireproto.t

@@ -147,13 +147,13 b' HTTP without the httpheader capability:'
 
 SSH (try to exercise the ssh functionality with a dummy script):
 
-  $ hg debugwireargs --ssh "$PYTHON $TESTDIR/dummyssh" ssh://user@dummy/repo uno due tre quattro
+  $ hg debugwireargs --ssh "\"$PYTHON\" $TESTDIR/dummyssh" ssh://user@dummy/repo uno due tre quattro
   uno due tre quattro None
-  $ hg debugwireargs --ssh "$PYTHON $TESTDIR/dummyssh" ssh://user@dummy/repo eins zwei --four vier
+  $ hg debugwireargs --ssh "\"$PYTHON\" $TESTDIR/dummyssh" ssh://user@dummy/repo eins zwei --four vier
   eins zwei None vier None
-  $ hg debugwireargs --ssh "$PYTHON $TESTDIR/dummyssh" ssh://user@dummy/repo eins zwei
+  $ hg debugwireargs --ssh "\"$PYTHON\" $TESTDIR/dummyssh" ssh://user@dummy/repo eins zwei
   eins zwei None None None
-  $ hg debugwireargs --ssh "$PYTHON $TESTDIR/dummyssh" ssh://user@dummy/repo eins zwei --five fuenf
+  $ hg debugwireargs --ssh "\"$PYTHON\" $TESTDIR/dummyssh" ssh://user@dummy/repo eins zwei --five fuenf
   eins zwei None None None
 
 Explicitly kill daemons to let the test exit on Windows