[llvm] r374648 - Reland r374388: [lit] Make internal diff work in pipelines
Joel E. Denny via llvm-commits
llvm-commits at lists.llvm.org
Sat Oct 12 04:56:57 PDT 2019
Author: jdenny
Date: Sat Oct 12 04:56:57 2019
New Revision: 374648
URL: http://llvm.org/viewvc/llvm-project?rev=374648&view=rev
Log:
Reland r374388: [lit] Make internal diff work in pipelines
To avoid breaking some tests, D66574, D68664, D67643, and D68668
landed together. However, D68664 introduced an issue now addressed by
D68839, with which these are now all relanding.
Differential Revision: https://reviews.llvm.org/D66574
Added:
llvm/trunk/utils/lit/lit/builtin_commands/diff.py
llvm/trunk/utils/lit/tests/Inputs/shtest-shell/diff-pipes.txt
Removed:
llvm/trunk/utils/lit/tests/Inputs/shtest-shell/diff-error-0.txt
Modified:
llvm/trunk/utils/lit/lit/TestRunner.py
llvm/trunk/utils/lit/tests/shtest-shell.py
Modified: llvm/trunk/utils/lit/lit/TestRunner.py
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/utils/lit/lit/TestRunner.py?rev=374648&r1=374647&r2=374648&view=diff
==============================================================================
--- llvm/trunk/utils/lit/lit/TestRunner.py (original)
+++ llvm/trunk/utils/lit/lit/TestRunner.py Sat Oct 12 04:56:57 2019
@@ -1,7 +1,5 @@
from __future__ import absolute_import
-import difflib
import errno
-import functools
import io
import itertools
import getopt
@@ -361,218 +359,6 @@ def executeBuiltinMkdir(cmd, cmd_shenv):
exitCode = 1
return ShellCommandResult(cmd, "", stderr.getvalue(), exitCode, False)
-def executeBuiltinDiff(cmd, cmd_shenv):
- """executeBuiltinDiff - Compare files line by line."""
- args = expand_glob_expressions(cmd.args, cmd_shenv.cwd)[1:]
- try:
- opts, args = getopt.gnu_getopt(args, "wbur", ["strip-trailing-cr"])
- except getopt.GetoptError as err:
- raise InternalShellError(cmd, "Unsupported: 'diff': %s" % str(err))
-
- filelines, filepaths, dir_trees = ([] for i in range(3))
- ignore_all_space = False
- ignore_space_change = False
- unified_diff = False
- recursive_diff = False
- strip_trailing_cr = False
- for o, a in opts:
- if o == "-w":
- ignore_all_space = True
- elif o == "-b":
- ignore_space_change = True
- elif o == "-u":
- unified_diff = True
- elif o == "-r":
- recursive_diff = True
- elif o == "--strip-trailing-cr":
- strip_trailing_cr = True
- else:
- assert False, "unhandled option"
-
- if len(args) != 2:
- raise InternalShellError(cmd, "Error: missing or extra operand")
-
- def getDirTree(path, basedir=""):
- # Tree is a tuple of form (dirname, child_trees).
- # An empty dir has child_trees = [], a file has child_trees = None.
- child_trees = []
- for dirname, child_dirs, files in os.walk(os.path.join(basedir, path)):
- for child_dir in child_dirs:
- child_trees.append(getDirTree(child_dir, dirname))
- for filename in files:
- child_trees.append((filename, None))
- return path, sorted(child_trees)
-
- def compareTwoFiles(filepaths):
- compare_bytes = False
- encoding = None
- filelines = []
- for file in filepaths:
- try:
- with open(file, 'r') as f:
- filelines.append(f.readlines())
- except UnicodeDecodeError:
- try:
- with io.open(file, 'r', encoding="utf-8") as f:
- filelines.append(f.readlines())
- encoding = "utf-8"
- except:
- compare_bytes = True
-
- if compare_bytes:
- return compareTwoBinaryFiles(filepaths)
- else:
- return compareTwoTextFiles(filepaths, encoding)
-
- def compareTwoBinaryFiles(filepaths):
- filelines = []
- for file in filepaths:
- with open(file, 'rb') as f:
- filelines.append(f.readlines())
-
- exitCode = 0
- if hasattr(difflib, 'diff_bytes'):
- # python 3.5 or newer
- diffs = difflib.diff_bytes(difflib.unified_diff, filelines[0], filelines[1], filepaths[0].encode(), filepaths[1].encode())
- diffs = [diff.decode() for diff in diffs]
- else:
- # python 2.7
- func = difflib.unified_diff if unified_diff else difflib.context_diff
- diffs = func(filelines[0], filelines[1], filepaths[0], filepaths[1])
-
- for diff in diffs:
- stdout.write(diff)
- exitCode = 1
- return exitCode
-
- def compareTwoTextFiles(filepaths, encoding):
- filelines = []
- for file in filepaths:
- if encoding is None:
- with open(file, 'r') as f:
- filelines.append(f.readlines())
- else:
- with io.open(file, 'r', encoding=encoding) as f:
- filelines.append(f.readlines())
-
- exitCode = 0
- def compose2(f, g):
- return lambda x: f(g(x))
-
- f = lambda x: x
- if strip_trailing_cr:
- f = compose2(lambda line: line.rstrip('\r'), f)
- if ignore_all_space or ignore_space_change:
- ignoreSpace = lambda line, separator: separator.join(line.split())
- ignoreAllSpaceOrSpaceChange = functools.partial(ignoreSpace, separator='' if ignore_all_space else ' ')
- f = compose2(ignoreAllSpaceOrSpaceChange, f)
-
- for idx, lines in enumerate(filelines):
- filelines[idx]= [f(line) for line in lines]
-
- func = difflib.unified_diff if unified_diff else difflib.context_diff
- for diff in func(filelines[0], filelines[1], filepaths[0], filepaths[1]):
- stdout.write(diff)
- exitCode = 1
- return exitCode
-
- def printDirVsFile(dir_path, file_path):
- if os.path.getsize(file_path):
- msg = "File %s is a directory while file %s is a regular file"
- else:
- msg = "File %s is a directory while file %s is a regular empty file"
- stdout.write(msg % (dir_path, file_path) + "\n")
-
- def printFileVsDir(file_path, dir_path):
- if os.path.getsize(file_path):
- msg = "File %s is a regular file while file %s is a directory"
- else:
- msg = "File %s is a regular empty file while file %s is a directory"
- stdout.write(msg % (file_path, dir_path) + "\n")
-
- def printOnlyIn(basedir, path, name):
- stdout.write("Only in %s: %s\n" % (os.path.join(basedir, path), name))
-
- def compareDirTrees(dir_trees, base_paths=["", ""]):
- # Dirnames of the trees are not checked, it's caller's responsibility,
- # as top-level dirnames are always different. Base paths are important
- # for doing os.walk, but we don't put it into tree's dirname in order
- # to speed up string comparison below and while sorting in getDirTree.
- left_tree, right_tree = dir_trees[0], dir_trees[1]
- left_base, right_base = base_paths[0], base_paths[1]
-
- # Compare two files or report file vs. directory mismatch.
- if left_tree[1] is None and right_tree[1] is None:
- return compareTwoFiles([os.path.join(left_base, left_tree[0]),
- os.path.join(right_base, right_tree[0])])
-
- if left_tree[1] is None and right_tree[1] is not None:
- printFileVsDir(os.path.join(left_base, left_tree[0]),
- os.path.join(right_base, right_tree[0]))
- return 1
-
- if left_tree[1] is not None and right_tree[1] is None:
- printDirVsFile(os.path.join(left_base, left_tree[0]),
- os.path.join(right_base, right_tree[0]))
- return 1
-
- # Compare two directories via recursive use of compareDirTrees.
- exitCode = 0
- left_names = [node[0] for node in left_tree[1]]
- right_names = [node[0] for node in right_tree[1]]
- l, r = 0, 0
- while l < len(left_names) and r < len(right_names):
- # Names are sorted in getDirTree, rely on that order.
- if left_names[l] < right_names[r]:
- exitCode = 1
- printOnlyIn(left_base, left_tree[0], left_names[l])
- l += 1
- elif left_names[l] > right_names[r]:
- exitCode = 1
- printOnlyIn(right_base, right_tree[0], right_names[r])
- r += 1
- else:
- exitCode |= compareDirTrees([left_tree[1][l], right_tree[1][r]],
- [os.path.join(left_base, left_tree[0]),
- os.path.join(right_base, right_tree[0])])
- l += 1
- r += 1
-
- # At least one of the trees has ended. Report names from the other tree.
- while l < len(left_names):
- exitCode = 1
- printOnlyIn(left_base, left_tree[0], left_names[l])
- l += 1
- while r < len(right_names):
- exitCode = 1
- printOnlyIn(right_base, right_tree[0], right_names[r])
- r += 1
- return exitCode
-
- stderr = StringIO()
- stdout = StringIO()
- exitCode = 0
- try:
- for file in args:
- if not os.path.isabs(file):
- file = os.path.realpath(os.path.join(cmd_shenv.cwd, file))
-
- if recursive_diff:
- dir_trees.append(getDirTree(file))
- else:
- filepaths.append(file)
-
- if not recursive_diff:
- exitCode = compareTwoFiles(filepaths)
- else:
- exitCode = compareDirTrees(dir_trees)
-
- except IOError as err:
- stderr.write("Error: 'diff' command failed, %s\n" % str(err))
- exitCode = 1
-
- return ShellCommandResult(cmd, stdout.getvalue(), stderr.getvalue(), exitCode, False)
-
def executeBuiltinRm(cmd, cmd_shenv):
"""executeBuiltinRm - Removes (deletes) files or directories."""
args = expand_glob_expressions(cmd.args, cmd_shenv.cwd)[1:]
@@ -838,14 +624,6 @@ def _executeShCmd(cmd, shenv, results, t
results.append(cmdResult)
return cmdResult.exitCode
- if cmd.commands[0].args[0] == 'diff':
- if len(cmd.commands) != 1:
- raise InternalShellError(cmd.commands[0], "Unsupported: 'diff' "
- "cannot be part of a pipeline")
- cmdResult = executeBuiltinDiff(cmd.commands[0], shenv)
- results.append(cmdResult)
- return cmdResult.exitCode
-
if cmd.commands[0].args[0] == 'rm':
if len(cmd.commands) != 1:
raise InternalShellError(cmd.commands[0], "Unsupported: 'rm' "
@@ -866,7 +644,7 @@ def _executeShCmd(cmd, shenv, results, t
stderrTempFiles = []
opened_files = []
named_temp_files = []
- builtin_commands = set(['cat'])
+ builtin_commands = set(['cat', 'diff'])
builtin_commands_dir = os.path.join(os.path.dirname(os.path.abspath(__file__)), "builtin_commands")
# To avoid deadlock, we use a single stderr stream for piped
# output. This is null until we have seen some output using
Added: llvm/trunk/utils/lit/lit/builtin_commands/diff.py
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/utils/lit/lit/builtin_commands/diff.py?rev=374648&view=auto
==============================================================================
--- llvm/trunk/utils/lit/lit/builtin_commands/diff.py (added)
+++ llvm/trunk/utils/lit/lit/builtin_commands/diff.py Sat Oct 12 04:56:57 2019
@@ -0,0 +1,228 @@
+import difflib
+import functools
+import getopt
+import os
+import sys
+
+class DiffFlags():
+ def __init__(self):
+ self.ignore_all_space = False
+ self.ignore_space_change = False
+ self.unified_diff = False
+ self.recursive_diff = False
+ self.strip_trailing_cr = False
+
+def getDirTree(path, basedir=""):
+ # Tree is a tuple of form (dirname, child_trees).
+ # An empty dir has child_trees = [], a file has child_trees = None.
+ child_trees = []
+ for dirname, child_dirs, files in os.walk(os.path.join(basedir, path)):
+ for child_dir in child_dirs:
+ child_trees.append(getDirTree(child_dir, dirname))
+ for filename in files:
+ child_trees.append((filename, None))
+ return path, sorted(child_trees)
+
+def compareTwoFiles(flags, filepaths):
+ compare_bytes = False
+ encoding = None
+ filelines = []
+ for file in filepaths:
+ try:
+ with open(file, 'r') as f:
+ filelines.append(f.readlines())
+ except UnicodeDecodeError:
+ try:
+ with io.open(file, 'r', encoding="utf-8") as f:
+ filelines.append(f.readlines())
+ encoding = "utf-8"
+ except:
+ compare_bytes = True
+
+ if compare_bytes:
+ return compareTwoBinaryFiles(flags, filepaths)
+ else:
+ return compareTwoTextFiles(flags, filepaths, encoding)
+
+def compareTwoBinaryFiles(flags, filepaths):
+ filelines = []
+ for file in filepaths:
+ with open(file, 'rb') as f:
+ filelines.append(f.readlines())
+
+ exitCode = 0
+ if hasattr(difflib, 'diff_bytes'):
+ # python 3.5 or newer
+ diffs = difflib.diff_bytes(difflib.unified_diff, filelines[0], filelines[1], filepaths[0].encode(), filepaths[1].encode())
+ diffs = [diff.decode() for diff in diffs]
+ else:
+ # python 2.7
+ if flags.unified_diff:
+ func = difflib.unified_diff
+ else:
+ func = difflib.context_diff
+ diffs = func(filelines[0], filelines[1], filepaths[0], filepaths[1])
+
+ for diff in diffs:
+ sys.stdout.write(diff)
+ exitCode = 1
+ return exitCode
+
+def compareTwoTextFiles(flags, filepaths, encoding):
+ filelines = []
+ for file in filepaths:
+ if encoding is None:
+ with open(file, 'r') as f:
+ filelines.append(f.readlines())
+ else:
+ with io.open(file, 'r', encoding=encoding) as f:
+ filelines.append(f.readlines())
+
+ exitCode = 0
+ def compose2(f, g):
+ return lambda x: f(g(x))
+
+ f = lambda x: x
+ if flags.strip_trailing_cr:
+ f = compose2(lambda line: line.rstrip('\r'), f)
+ if flags.ignore_all_space or flags.ignore_space_change:
+ ignoreSpace = lambda line, separator: separator.join(line.split())
+ ignoreAllSpaceOrSpaceChange = functools.partial(ignoreSpace, separator='' if flags.ignore_all_space else ' ')
+ f = compose2(ignoreAllSpaceOrSpaceChange, f)
+
+ for idx, lines in enumerate(filelines):
+ filelines[idx]= [f(line) for line in lines]
+
+ func = difflib.unified_diff if flags.unified_diff else difflib.context_diff
+ for diff in func(filelines[0], filelines[1], filepaths[0], filepaths[1]):
+ sys.stdout.write(diff)
+ exitCode = 1
+ return exitCode
+
+def printDirVsFile(dir_path, file_path):
+ if os.path.getsize(file_path):
+ msg = "File %s is a directory while file %s is a regular file"
+ else:
+ msg = "File %s is a directory while file %s is a regular empty file"
+ sys.stdout.write(msg % (dir_path, file_path) + "\n")
+
+def printFileVsDir(file_path, dir_path):
+ if os.path.getsize(file_path):
+ msg = "File %s is a regular file while file %s is a directory"
+ else:
+ msg = "File %s is a regular empty file while file %s is a directory"
+ sys.stdout.write(msg % (file_path, dir_path) + "\n")
+
+def printOnlyIn(basedir, path, name):
+ sys.stdout.write("Only in %s: %s\n" % (os.path.join(basedir, path), name))
+
+def compareDirTrees(flags, dir_trees, base_paths=["", ""]):
+ # Dirnames of the trees are not checked, it's caller's responsibility,
+ # as top-level dirnames are always different. Base paths are important
+ # for doing os.walk, but we don't put it into tree's dirname in order
+ # to speed up string comparison below and while sorting in getDirTree.
+ left_tree, right_tree = dir_trees[0], dir_trees[1]
+ left_base, right_base = base_paths[0], base_paths[1]
+
+ # Compare two files or report file vs. directory mismatch.
+ if left_tree[1] is None and right_tree[1] is None:
+ return compareTwoFiles(flags,
+ [os.path.join(left_base, left_tree[0]),
+ os.path.join(right_base, right_tree[0])])
+
+ if left_tree[1] is None and right_tree[1] is not None:
+ printFileVsDir(os.path.join(left_base, left_tree[0]),
+ os.path.join(right_base, right_tree[0]))
+ return 1
+
+ if left_tree[1] is not None and right_tree[1] is None:
+ printDirVsFile(os.path.join(left_base, left_tree[0]),
+ os.path.join(right_base, right_tree[0]))
+ return 1
+
+ # Compare two directories via recursive use of compareDirTrees.
+ exitCode = 0
+ left_names = [node[0] for node in left_tree[1]]
+ right_names = [node[0] for node in right_tree[1]]
+ l, r = 0, 0
+ while l < len(left_names) and r < len(right_names):
+ # Names are sorted in getDirTree, rely on that order.
+ if left_names[l] < right_names[r]:
+ exitCode = 1
+ printOnlyIn(left_base, left_tree[0], left_names[l])
+ l += 1
+ elif left_names[l] > right_names[r]:
+ exitCode = 1
+ printOnlyIn(right_base, right_tree[0], right_names[r])
+ r += 1
+ else:
+ exitCode |= compareDirTrees(flags,
+ [left_tree[1][l], right_tree[1][r]],
+ [os.path.join(left_base, left_tree[0]),
+ os.path.join(right_base, right_tree[0])])
+ l += 1
+ r += 1
+
+ # At least one of the trees has ended. Report names from the other tree.
+ while l < len(left_names):
+ exitCode = 1
+ printOnlyIn(left_base, left_tree[0], left_names[l])
+ l += 1
+ while r < len(right_names):
+ exitCode = 1
+ printOnlyIn(right_base, right_tree[0], right_names[r])
+ r += 1
+ return exitCode
+
+def main(argv):
+ args = argv[1:]
+ try:
+ opts, args = getopt.gnu_getopt(args, "wbur", ["strip-trailing-cr"])
+ except getopt.GetoptError as err:
+ sys.stderr.write("Unsupported: 'diff': %s\n" % str(err))
+ sys.exit(1)
+
+ flags = DiffFlags()
+ filelines, filepaths, dir_trees = ([] for i in range(3))
+ for o, a in opts:
+ if o == "-w":
+ flags.ignore_all_space = True
+ elif o == "-b":
+ flags.ignore_space_change = True
+ elif o == "-u":
+ flags.unified_diff = True
+ elif o == "-r":
+ flags.recursive_diff = True
+ elif o == "--strip-trailing-cr":
+ flags.strip_trailing_cr = True
+ else:
+ assert False, "unhandled option"
+
+ if len(args) != 2:
+ sys.stderr.write("Error: missing or extra operand\n")
+ sys.exit(1)
+
+ exitCode = 0
+ try:
+ for file in args:
+ if not os.path.isabs(file):
+ file = os.path.realpath(os.path.join(os.getcwd(), file))
+
+ if flags.recursive_diff:
+ dir_trees.append(getDirTree(file))
+ else:
+ filepaths.append(file)
+
+ if not flags.recursive_diff:
+ exitCode = compareTwoFiles(flags, filepaths)
+ else:
+ exitCode = compareDirTrees(flags, dir_trees)
+
+ except IOError as err:
+ sys.stderr.write("Error: 'diff' command failed, %s\n" % str(err))
+ exitCode = 1
+
+ sys.exit(exitCode)
+
+if __name__ == "__main__":
+ main(sys.argv)
Removed: llvm/trunk/utils/lit/tests/Inputs/shtest-shell/diff-error-0.txt
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/utils/lit/tests/Inputs/shtest-shell/diff-error-0.txt?rev=374647&view=auto
==============================================================================
--- llvm/trunk/utils/lit/tests/Inputs/shtest-shell/diff-error-0.txt (original)
+++ llvm/trunk/utils/lit/tests/Inputs/shtest-shell/diff-error-0.txt (removed)
@@ -1,3 +0,0 @@
-# Check error on a unsupported diff (cannot be part of a pipeline).
-#
-# RUN: diff diff-error-0.txt diff-error-0.txt | echo Output
Added: llvm/trunk/utils/lit/tests/Inputs/shtest-shell/diff-pipes.txt
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/utils/lit/tests/Inputs/shtest-shell/diff-pipes.txt?rev=374648&view=auto
==============================================================================
--- llvm/trunk/utils/lit/tests/Inputs/shtest-shell/diff-pipes.txt (added)
+++ llvm/trunk/utils/lit/tests/Inputs/shtest-shell/diff-pipes.txt Sat Oct 12 04:56:57 2019
@@ -0,0 +1,15 @@
+# RUN: echo foo > %t.foo
+# RUN: echo bar > %t.bar
+
+# Check output pipe.
+# RUN: diff %t.foo %t.foo | FileCheck -allow-empty -check-prefix=EMPTY %s
+# RUN: diff -u %t.foo %t.bar | FileCheck %s && false || true
+
+# Fail so lit will print output.
+# RUN: false
+
+# CHECK: @@
+# CHECK-NEXT: -foo
+# CHECK-NEXT: +bar
+
+# EMPTY-NOT: {{.}}
Modified: llvm/trunk/utils/lit/tests/shtest-shell.py
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/utils/lit/tests/shtest-shell.py?rev=374648&r1=374647&r2=374648&view=diff
==============================================================================
--- llvm/trunk/utils/lit/tests/shtest-shell.py (original)
+++ llvm/trunk/utils/lit/tests/shtest-shell.py Sat Oct 12 04:56:57 2019
@@ -34,28 +34,20 @@
# CHECK: error: command failed with exit status: 127
# CHECK: ***
-# CHECK: FAIL: shtest-shell :: diff-error-0.txt
-# CHECK: *** TEST 'shtest-shell :: diff-error-0.txt' FAILED ***
-# CHECK: $ "diff" "diff-error-0.txt" "diff-error-0.txt"
-# CHECK: # command stderr:
-# CHECK: Unsupported: 'diff' cannot be part of a pipeline
-# CHECK: error: command failed with exit status: 127
-# CHECK: ***
-
# CHECK: FAIL: shtest-shell :: diff-error-1.txt
# CHECK: *** TEST 'shtest-shell :: diff-error-1.txt' FAILED ***
# CHECK: $ "diff" "-B" "temp1.txt" "temp2.txt"
# CHECK: # command stderr:
# CHECK: Unsupported: 'diff': option -B not recognized
-# CHECK: error: command failed with exit status: 127
+# CHECK: error: command failed with exit status: 1
# CHECK: ***
# CHECK: FAIL: shtest-shell :: diff-error-2.txt
# CHECK: *** TEST 'shtest-shell :: diff-error-2.txt' FAILED ***
# CHECK: $ "diff" "temp.txt"
# CHECK: # command stderr:
-# CHECK: Error: missing or extra operand
-# CHECK: error: command failed with exit status: 127
+# CHECK: Error: missing or extra operand
+# CHECK: error: command failed with exit status: 1
# CHECK: ***
# CHECK: FAIL: shtest-shell :: diff-error-3.txt
@@ -82,18 +74,43 @@
# CHECK: *** TEST 'shtest-shell :: diff-error-5.txt' FAILED ***
# CHECK: $ "diff"
# CHECK: # command stderr:
-# CHECK: Error: missing or extra operand
-# CHECK: error: command failed with exit status: 127
+# CHECK: Error: missing or extra operand
+# CHECK: error: command failed with exit status: 1
# CHECK: ***
# CHECK: FAIL: shtest-shell :: diff-error-6.txt
# CHECK: *** TEST 'shtest-shell :: diff-error-6.txt' FAILED ***
# CHECK: $ "diff"
# CHECK: # command stderr:
-# CHECK: Error: missing or extra operand
-# CHECK: error: command failed with exit status: 127
+# CHECK: Error: missing or extra operand
+# CHECK: error: command failed with exit status: 1
# CHECK: ***
+
+# CHECK: FAIL: shtest-shell :: diff-pipes.txt
+
+# CHECK: *** TEST 'shtest-shell :: diff-pipes.txt' FAILED ***
+
+# CHECK: $ "diff" "{{[^"]*}}.foo" "{{[^"]*}}.foo"
+# CHECK-NOT: note
+# CHECK-NOT: error
+# CHECK: $ "FileCheck"
+# CHECK-NOT: note
+# CHECK-NOT: error
+
+# CHECK: $ "diff" "-u" "{{[^"]*}}.foo" "{{[^"]*}}.bar"
+# CHECK: note: command had no output on stdout or stderr
+# CHECK: error: command failed with exit status: 1
+# CHECK: $ "FileCheck"
+# CHECK-NOT: note
+# CHECK-NOT: error
+# CHECK: $ "true"
+
+# CHECK: $ "false"
+
+# CHECK: ***
+
+
# CHECK: FAIL: shtest-shell :: diff-r-error-0.txt
# CHECK: *** TEST 'shtest-shell :: diff-r-error-0.txt' FAILED ***
# CHECK: $ "diff" "-r"
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