- added new function core.run_external which can be used to execute an external program

Basically it's just a wrapper around subprocess.call which raises an ExtRuntimeError
exception if subprocess.call raised an OSError with errno set to ENOENT (unfortunately
the OSError's filename attribute is set to None therefore we cannot print a meaningful
error message (that's why an ExtRuntimeError is raised)).
Replaced all occurrences of subprocess.call with a corresponding run_external call.

osc/babysitter.py

@@ -149,7 +149,7 @@ def run(prg):
         print >>sys.stderr, e
         return 2
     except oscerr.ExtRuntimeError, e:
-        print >>sys.stderr, e.msg
+        print >>sys.stderr, e.file + ':', e.msg
         return 1
     except oscerr.WorkingCopyOutdated, e:
         print >>sys.stderr, e

osc/build.py

@@ -13,7 +13,7 @@ import urlparse
 from tempfile import NamedTemporaryFile, mkdtemp
 from osc.fetch import *
 from osc.core import get_buildinfo, store_read_apiurl, store_read_project, store_read_package, meta_exists, quote_plus, get_buildconfig, is_package_dir
-from osc.core import get_binarylist, get_binary_file
+from osc.core import get_binarylist, get_binary_file, run_external
 from osc.util import rpmquery, debquery, archquery
 import osc.conf
 import oscerr
@@ -913,14 +913,15 @@ def main(apiurl, opts, argv):
         cmd = [ change_personality[bi.buildarch] ] + cmd;
 
     try:
-        rc = subprocess.call(cmd)
+        rc = run_external(cmd[0], *cmd[1:])
         if rc:
             print
             print 'The buildroot was:', build_root
             sys.exit(rc)
     except KeyboardInterrupt, i:
         print "keyboard interrupt, killing build ..."
-        subprocess.call(cmd + ["--kill"])
+        cmd.append('--kill')
+        run_external(cmd[0], *cmd[1:])
         raise i
 
     pacdir = os.path.join(build_root, '.build.packages')

osc/commandline.py

@@ -5416,7 +5416,7 @@ Please submit there instead, or use --nodevelproject to force direct submission.
                         pdir,
                         "%s:%s" % (hostname, os.path.dirname(hostprefer))]
                 print 'Run: %s' % " ".join(rsync_prefer_cmd)
-                ret = subprocess.call(rsync_prefer_cmd)
+                ret = run_external(rsync_prefer_cmd[0], *rsync_prefer_cmd[1:])
                 if ret != 0:
                     return ret
 
@@ -5466,7 +5466,7 @@ Please submit there instead, or use --nodevelproject to force direct submission.
         # 1.) rsync sources
         rsync_source_cmd = ['rsync', '-az', '-delete', '-e', 'ssh', cwd, "%s:%s" % (hostname, hostpath)]
         print 'Run: %s' % " ".join(rsync_source_cmd)
-        ret = subprocess.call(rsync_source_cmd)
+        ret = run_external(rsync_source_cmd[0], *rsync_source_cmd[1:])
         if ret != 0:
             return ret
 
@@ -5497,7 +5497,7 @@ Please submit there instead, or use --nodevelproject to force direct submission.
             local_args = " ".join(hostargs))
             ]
         print 'Run: %s' % " ".join(ssh_cmd)
-        build_ret = subprocess.call(ssh_cmd)
+        build_ret = run_external(ssh_cmd[0], *ssh_cmd[1:])
         if build_ret != 0:
             return build_ret
 
@@ -5505,7 +5505,7 @@ Please submit there instead, or use --nodevelproject to force direct submission.
         if opts.keep_pkgs:
             ret = rsync_keep_cmd = ['rsync', '-az', '-e', 'ssh', "%s:%s" % (hostname, hostkeep), opts.keep_pkgs]
             print 'Run: %s' % " ".join(rsync_keep_cmd)
-            ret = subprocess.call(rsync_keep_cmd)
+            ret = run_external(rsync_keep_cmd[0], *rsync_keep_cmd[1:])
             if ret != 0:
                 return ret
 
@@ -7308,14 +7308,14 @@ Please submit there instead, or use --nodevelproject to force direct submission.
                 continue
 
             o = open(os.path.join(destdir,  name), 'wb')
-            code = subprocess.call(['diff3', '-m', '-E',
+            code = run_external('diff3', '-m', '-E',
               '-L', '.mine',
               os.path.join(destdir, name + '.mine'),
               '-L', '.old',
               os.path.join(destdir, name + '.old'),
               '-L', '.new',
               os.path.join(destdir, name + '.new'),
-            ], stdout=o)
+            stdout=o)
             if code == 0:
                 print statfrmt('G', name)
                 os.unlink(os.path.join(destdir, name + '.mine'))
@@ -7436,11 +7436,11 @@ Please submit there instead, or use --nodevelproject to force direct submission.
                 continue
 
             o = open(name, 'wb')
-            code = subprocess.call(['diff3', '-m', '-E',
+            code = run_external('diff3', '-m', '-E',
               '-L', '.mine', name + '.mine',
               '-L', '.old', name + '.old',
               '-L', '.new', name + '.new',
-            ], stdout=o)
+            stdout=o)
             if code == 0:
                 print statfrmt('G', name)
                 os.unlink(name + '.mine')

osc/core.py

@@ -24,6 +24,7 @@ import conf
 import subprocess
 import re
 import socket
+import errno
 try:
     from xml.etree import cElementTree as ET
 except ImportError:
@@ -361,10 +362,10 @@ class Serviceinfo:
             name = call.split(None, 1)[0]
             if not os.path.exists("/usr/lib/obs/service/"+name):
                 raise oscerr.PackageNotInstalled("obs-service-"+name)
-            c = "/usr/lib/obs/service/" + call + " --outdir " + temp_dir
+            cmd = "/usr/lib/obs/service/" + call + " --outdir " + temp_dir
             if conf.config['verbose'] > 1 or verbose:
-                print "Run source service:", c
-            r = subprocess.call(c, shell=True)
+                print "Run source service:", cmd
+            r = run_external(cmd, shell=True)
 
             if r != 0:
                 print "Aborting: service call failed: " + c
@@ -1458,8 +1459,7 @@ class Package:
             # try merging
             # diff3 OPTIONS... MINE OLDER YOURS
             merge_cmd = 'diff3 -m -E %s %s %s > %s' % (myfilename, storefilename, upfilename, filename)
-            # we would rather use the subprocess module, but it is not availablebefore 2.4
-            ret = subprocess.call(merge_cmd, shell=True)
+            ret = run_external(merge_cmd, shell=True)
 
             #   "An exit status of 0 means `diff3' was successful, 1 means some
             #   conflicts were found, and 2 means trouble."
@@ -3443,10 +3443,7 @@ def run_pager(message, tmp_suffix=''):
         tmpfile.flush()
         pager = os.getenv('PAGER', default=get_default_pager())
         try:
-            try:
-                subprocess.call('%s %s' % (pager, tmpfile.name), shell=True)
-            except OSError, e:
-                raise oscerr.ExtRuntimeError('cannot run pager \'%s\': %s' % (pager, e.strerror), pager)
+            run_external(pager, tmpfile.name)
         finally:
             tmpfile.close()
 
@@ -3454,10 +3451,7 @@ def run_editor(filename):
     editor = os.getenv('EDITOR', default=get_default_editor())
     cmd = editor.split(' ')
     cmd.append(filename)
-    try:
-        return subprocess.call(cmd)
-    except OSError, e:
-        raise oscerr.ExtRuntimeError('cannot run editor \'%s\': %s' % (editor, e.strerror), editor)
+    return run_external(cmd[0], *cmd[1:])
 
 def edit_message(footer='', template='', templatelen=30):
     delim = '--This line, and those below, will be ignored--\n'
@@ -5836,7 +5830,7 @@ def unpack_srcrpm(srpm, dir, *files):
     if os.path.isdir(dir):
         os.chdir(dir)
     cmd = 'rpm2cpio %s | cpio -i %s &> /dev/null' % (srpm, ' '.join(files))
-    ret = subprocess.call(cmd, shell=True)
+    ret = run_external(cmd, shell=True)
     if ret != 0:
         print >>sys.stderr, 'error \'%s\' - cannot extract \'%s\'' % (ret, srpm)
         sys.exit(1)
@@ -6413,7 +6407,7 @@ def request_interactive_review(apiurl, request, initial_cmd='', group=None, igno
 
 def edit_submitrequest(apiurl, project, orequest, new_request=None):
     """edit a submit action from orequest/new_request"""
-    import tempfile, shutil, subprocess
+    import tempfile, shutil
     actions = orequest.get_actions('submit')
     oactions = actions
     if not orequest is None:
@@ -6446,7 +6440,7 @@ def edit_submitrequest(apiurl, project, orequest, new_request=None):
         os.chdir(tmpdir)
         print 'Checked out package \'%s\' to %s. Started a new shell (%s).\n' \
             'Please fix the package and close the shell afterwards.' % (package, tmpdir, shell)
-        subprocess.call(shell)
+        run_external(shell)
         # the pkg might have uncommitted changes...
         cleanup = False
         os.chdir(olddir)
@@ -6529,6 +6523,31 @@ def raw_input(*args):
         # interpret ctrl-d as user abort
         raise oscerr.UserAbort()
 
+def run_external(filename, *args, **kwargs):
+    """Executes the program filename via subprocess.call.
+
+    *args are additional arguments which are passed to the
+    program filename. **kwargs specify additional arguments for
+    the subprocess.call function.
+    if no args are specified the plain filename is passed
+    to subprocess.call (this can be used to execute a shell
+    command). Otherwise [filename] + list(args) is passed
+    to the subprocess.call function.
+
+    """
+    # unless explicitly specified use shell=False
+    kwargs.setdefault('shell', False)
+    if args:
+        cmd = [filename] + list(args)
+    else:
+        cmd = filename
+    try:
+        return subprocess.call(cmd, **kwargs)
+    except OSError, e:
+        if e.errno != errno.ENOENT:
+            raise
+        raise oscerr.ExtRuntimeError(e.strerror, filename)
+
 # backward compatibility: local role filtering
 def filter_role(meta, user, role):
     """