fix regression in osc chroot

This fixes some regressions with osc chroot:

- osc chroot --wipe --root=/dir/ can now be called outside
  a working copy
- osc chroot --noinit --root=/dir/ can now be called outside
  a working copy and behaves like the old code (Just entering
  the chroot without any modifications)
- The confirmation of the deletion is implemented again and thus
  the --force option was implemented too.

osc/build.py

@@ -524,6 +524,32 @@ def get_kiwipath_from_buildinfo(apiurl, bi_filename, prj, repo):
     kiwipath.insert(0, myprp)
     return kiwipath
 
+def calculate_prj_pac(opts, descr):
+    project = opts.alternative_project or store_read_project('.')
+    if opts.local_package:
+        package = os.path.splitext(os.path.basename(descr))[0]
+    else:
+        package = store_read_package('.')
+    return project, package
+
+def calculate_build_root(apihost, prj, pac, repo, arch):
+    buildroot = os.environ.get('OSC_BUILD_ROOT', config['build-root']) \
+                            % {'repo': repo, 'arch': arch, 'project': prj, 'package': pac, 'apihost': apihost}
+    return buildroot
+
+def run_build(*args):
+    cmd = [config['build-cmd']]
+    cmd += args
+
+    sucmd = os.environ.get('OSC_SU_WRAPPER', config['su-wrapper']).split()
+    if sucmd[0] == 'su':
+        if sucmd[-1] == '-c':
+            sucmd.pop()
+        cmd = sucmd + ['-s', cmd[0], 'root', '--'] + cmd[1:]
+    else:
+        cmd = sucmd + cmd
+    return run_external(cmd[0], *cmd[1:])
+
 def main(apiurl, opts, argv):
 
     repo = argv[0]
@@ -696,12 +722,6 @@ def main(apiurl, opts, argv):
 
     if opts.shell:
         buildargs.append("--shell")
-        if os.path.exists(build_root) and os.path.exists(bi_filename) and not opts.clean and not opts.extra_pkgs:
-            opts.noinit = True
-            opts.offline = True
-            # we should check if the service did run before and only skip it then,
-            # but we have no save point for this atm
-            opts.noservice = True
 
     if opts.noinit:
         buildargs.append('--noinit')

osc/commandline.py

@@ -6341,6 +6341,8 @@ Please submit there instead, or use --nodevelproject to force direct submission.
                   help=SUPPRESS_HELP)
     @cmdln.option('--shell-cmd', metavar='COMMAND',
                   help='run specified command instead of bash')
+    @cmdln.option('-f', '--force', action='store_true',
+                  help='Do not ask for confirmation to wipe')
     @cmdln.option('--host', metavar='HOST',
             help='perform the build on a remote server - user@server:~/remote/directory')
     @cmdln.option('--trust-all-projects', action='store_true',
@@ -6425,9 +6427,6 @@ Please submit there instead, or use --nodevelproject to force direct submission.
         if opts.debuginfo and opts.disable_debuginfo:
             raise oscerr.WrongOptions('osc: --debuginfo and --disable-debuginfo are mutual exclusive')
 
-        if subcmd == 'chroot' or subcmd == 'shell':
-            opts.shell = True
-
         if subcmd == 'wipe':
             opts.wipe = True
 
@@ -6450,6 +6449,33 @@ Please submit there instead, or use --nodevelproject to force direct submission.
                if not opts.vm_type:
                   opts.vm_type = lastbuildroot[2]
 
+        vm_chroot = opts.vm_type or conf.config['build-type']
+        if (subcmd in ('shell', 'chroot') or opts.shell or opts.wipe) and not vm_chroot:
+            if opts.root:
+                build_root = opts.root
+            else:
+                args = self.parse_repoarchdescr(args, opts.noinit or opts.offline, opts.alternative_project, False, opts.vm_type, opts.multibuild_package)
+                repo, arch, build_descr = args
+                prj, pac = osc.build.calculate_prj_pac(opts, build_descr)
+                apihost = urlsplit(self.get_api_url())[1]
+                build_root = osc.build.calculate_build_root(apihost, prj, pac, repo,
+                                                    arch)
+            if opts.wipe and not opts.force:
+                    # Confirm delete
+                    print("Really wipe '%s'? [y/N]: " % build_root)
+                    choice = raw_input().lower()
+                    if choice != 'y':
+                        print('Aborting')
+                        sys.exit(0)
+            build_args = ['--root=' + build_root, '--noinit', '--shell']
+            if opts.wipe:
+                build_args.append('--wipe')
+            sys.exit(osc.build.run_build(*build_args))
+        elif subcmd in ('shell', 'chroot') or opts.shell:
+            print('--shell in combination with build-type %s is experimental.' % vm_chroot)
+            print('The semantics may change at any time!')
+            opts.shell = True
+
         args = self.parse_repoarchdescr(args, opts.noinit or opts.offline, opts.alternative_project, False, opts.vm_type, opts.multibuild_package)
 
         if not opts.local_package: