tests: don't overwrite HGRCPATH

Overwriting instead of appending to the file removes the [defaults]
section put into the file by run-tests.py.

It also defeats the --inotify option to run-tests.py.

(Nothing was broken yet, but the lack of -d "0 0" cause changeset
hashes to change unexpectedly in a test case I was editing.)

contrib/check-code.py

@@ -66,6 +66,7 b' testpats = ['
     (r'^source\b', "don't use 'source', use '.'"),
     (r'touch -d', "don't use 'touch -d', use 'touch -t' instead"),
     (r'ls\s+[^|-]+\s+-', "options to 'ls' must come before filenames"),
+    (r'cat > \$HGRCPATH <<EOF', "append to $HGRCPATH, do not overwrite it"),
 ]
 
 testfilters = [

tests/test-convert-hg-startrev.t

@@ -1,5 +1,5 b''
 
-  $ cat > $HGRCPATH <<EOF
+  $ cat >> $HGRCPATH <<EOF
   > [extensions]
   > graphlog =
   > convert =

tests/test-convert-svn-branches.t

@@ -1,7 +1,7 b''
 
   $ "$TESTDIR/hghave" svn svn-bindings || exit 80
 
-  $ cat > $HGRCPATH <<EOF
+  $ cat >> $HGRCPATH <<EOF
   > [extensions]
   > convert = 
   > graphlog =

tests/test-convert-svn-encoding.t

@@ -1,7 +1,7 b''
 
   $ "$TESTDIR/hghave" svn svn-bindings || exit 80
 
-  $ cat > $HGRCPATH <<EOF
+  $ cat >> $HGRCPATH <<EOF
   > [extensions]
   > convert = 
   > graphlog =

tests/test-convert-svn-move.t

@@ -5,7 +5,7 b''
   > {
   >     tr '\\' /
   > }
-  $ cat > $HGRCPATH <<EOF
+  $ cat >> $HGRCPATH <<EOF
   > [extensions]
   > convert = 
   > graphlog =

tests/test-convert-svn-sink.t

@@ -22,7 +22,7 b''
   >     )
   > }
 
-  $ cat > $HGRCPATH <<EOF
+  $ cat >> $HGRCPATH <<EOF
   > [extensions]
   > convert = 
   > graphlog =

tests/test-convert-svn-source.t

@@ -5,7 +5,7 b''
   > {
   >     tr '\\' /
   > }
-  $ cat > $HGRCPATH <<EOF
+  $ cat >> $HGRCPATH <<EOF
   > [extensions]
   > convert = 
   > graphlog =

tests/test-convert-svn-startrev.t

@@ -1,7 +1,7 b''
 
   $ "$TESTDIR/hghave" svn svn-bindings || exit 80
 
-  $ cat > $HGRCPATH <<EOF
+  $ cat >> $HGRCPATH <<EOF
   > [extensions]
   > convert = 
   > graphlog =

tests/test-convert-svn-tags.t

@@ -1,7 +1,7 b''
 
   $ "$TESTDIR/hghave" svn svn-bindings || exit 80
 
-  $ cat > $HGRCPATH <<EOF
+  $ cat >> $HGRCPATH <<EOF
   > [extensions]
   > convert = 
   > graphlog =

tests/test-eol-add.t

@@ -1,6 +1,6 b''
 Test adding .hgeol
 
-  $ cat > $HGRCPATH <<EOF
+  $ cat >> $HGRCPATH <<EOF
   > [diff]
   > git = 1
   > EOF

tests/test-eol-clone.t

@@ -1,6 +1,6 b''
 Testing cloning with the EOL extension
 
-  $ cat > $HGRCPATH <<EOF
+  $ cat >> $HGRCPATH <<EOF
   > [diff]
   > git = True
   > 

tests/test-eol-hook.t

@@ -1,6 +1,6 b''
 Test the EOL hook
 
-  $ cat > $HGRCPATH <<EOF
+  $ cat >> $HGRCPATH <<EOF
   > [diff]
   > git = True
   > EOF

tests/test-eol-patch.t

@@ -1,6 +1,6 b''
 Test EOL patching
 
-  $ cat > $HGRCPATH <<EOF
+  $ cat >> $HGRCPATH <<EOF
   > [diff]
   > git = 1
   > EOF

tests/test-eol-tag.t

@@ -2,7 +2,7 b' http://mercurial.selenic.com/bts/issue24'
 
 Testing tagging with the EOL extension
 
-  $ cat > $HGRCPATH <<EOF
+  $ cat >> $HGRCPATH <<EOF
   > [diff]
   > git = True
   > 

tests/test-eol-update.t

@@ -1,6 +1,6 b''
 Test EOL update
 
-  $ cat > $HGRCPATH <<EOF
+  $ cat >> $HGRCPATH <<EOF
   > [diff]
   > git = 1
   > EOF

tests/test-eol.t

@@ -1,6 +1,6 b''
 Test EOL extension
 
-  $ cat > $HGRCPATH <<EOF
+  $ cat >> $HGRCPATH <<EOF
   > [diff]
   > git = True
   > EOF