1 files changed, 101 insertions, 0 deletions
diff --git a/script/bisect-test.py b/script/bisect-test.py
new file mode 100755
index 0000000..7c5cd63
--- /dev/null
+++ b/script/bisect-test.py
@@ -0,0 +1,101 @@
+#!/usr/bin/env python3
+# use git bisect to work out what commit caused a test failure
+# Copyright Andrew Tridgell 2010
+# released under GNU GPL v3 or later
+
+
+from subprocess import call, check_call, Popen, PIPE
+import os
+import tempfile
+import sys
+from optparse import OptionParser
+
+parser = OptionParser()
+parser.add_option("", "--good", help="known good revision (default HEAD~100)", default='HEAD~100')
+parser.add_option("", "--bad", help="known bad revision (default HEAD)", default='HEAD')
+parser.add_option("", "--skip-build-errors", help="skip revision where make fails",
+                  action='store_true', default=False)
+parser.add_option("", "--autogen", help="run autogen before each build", action="store_true", default=False)
+parser.add_option("", "--autogen-command", help="command to use for autogen (default ./autogen.sh)",
+                  type='str', default="./autogen.sh")
+parser.add_option("", "--configure", help="run configure.developer before each build",
+                  action="store_true", default=False)
+parser.add_option("", "--configure-command", help="the command for configure (default ./configure.developer)",
+                  type='str', default="./configure.developer")
+parser.add_option("", "--build-command", help="the command to build the tree (default 'make -j')",
+                  type='str', default="make -j")
+parser.add_option("", "--test-command", help="the command to test the tree (default 'make test')",
+                  type='str', default="make test")
+parser.add_option("", "--clean", help="run make clean before each build",
+                  action="store_true", default=False)
+
+
+(opts, args) = parser.parse_args()
+
+
+def run_cmd(cmd, dir=".", show=True, output=False, checkfail=True):
+    if show:
+        print("Running: '%s' in '%s'" % (cmd, dir))
+    if output:
+        return Popen([cmd], shell=True, stdout=PIPE, cwd=dir).communicate()[0]
+    elif checkfail:
+        return check_call(cmd, shell=True, cwd=dir)
+    else:
+        return call(cmd, shell=True, cwd=dir)
+
+
+def find_git_root():
+    '''get to the top of the git repo'''
+    p = os.getcwd()
+    while p != '/':
+        if os.path.exists(os.path.join(p, ".git")):
+            return p
+        p = os.path.abspath(os.path.join(p, '..'))
+    return None
+
+
+cwd = os.getcwd()
+gitroot = find_git_root()
+
+# create a bisect script
+f = tempfile.NamedTemporaryFile(delete=False, mode="w+t")
+f.write("set -x\n")
+f.write("cd %s || exit 125\n" % cwd)
+if opts.autogen:
+    f.write("%s || exit 125\n" % opts.autogen_command)
+if opts.configure:
+    f.write("%s || exit 125\n" % opts.configure_command)
+if opts.clean:
+    f.write("make clean || exit 125\n")
+if opts.skip_build_errors:
+    build_err = 125
+else:
+    build_err = 1
+f.write("%s || exit %u\n" % (opts.build_command, build_err))
+f.write("%s || exit 1\n" % opts.test_command)
+f.write("exit 0\n")
+f.close()
+
+
+def cleanup():
+    run_cmd("git bisect reset", dir=gitroot)
+    os.unlink(f.name)
+    sys.exit(-1)
+
+
+# run bisect
+ret = -1
+try:
+    run_cmd("git bisect reset", dir=gitroot, show=False, checkfail=False)
+    run_cmd("git bisect start %s %s --" % (opts.bad, opts.good), dir=gitroot)
+    ret = run_cmd("git bisect run bash %s" % f.name, dir=gitroot, show=True, checkfail=False)
+except KeyboardInterrupt:
+    print("Cleaning up")
+    cleanup()
+except Exception as reason:
+    print("Failed bisect: %s" % reason)
+    cleanup()
+
+run_cmd("git bisect reset", dir=gitroot)
+os.unlink(f.name)
+sys.exit(ret)