[PATCH] Add --chainbuild option.

[Gianluca Sforna]

With this patch, mock grows a --chainbuild option (and a Require on
createrepo).

The --chainbuild option work by creating a local yum repository in the
resultdir path which is used during the BuildRequires installation
step.
The net result is that, when building more than one srpm in the same
run, later builds can find required packages built in previous steps.
---
 py/mock.py         |   11 +++++++++++
 py/mock/backend.py |    8 ++++++++
 py/mock/util.py    |    7 +++++++
 3 files changed, 26 insertions(+), 0 deletions(-)

diff --git a/py/mock.py b/py/mock.py
index 408b421..a801807 100755
--- a/py/mock.py
+++ b/py/mock.py
@@ -113,6 +113,11 @@ def command_parse(config_opts):
                      help="chroot name/config file name default: %default",
                      default='default')

+    parser.add_option("--chainbuild", action="store_true", dest="chainbuild",
+                      help="install all built RPMs in the chroot
before continuing"
+                      " with the next one",
+                      default=False)
+
    parser.add_option("--offline", action="store_false", dest="online",
                      default=True,
                      help="activate 'offline' mode.")
@@ -216,6 +221,7 @@ def setup_default_config_opts(config_opts, unprivUid):
    config_opts['build_log_fmt_name'] = "unadorned"
    config_opts['root_log_fmt_name']  = "detailed"
    config_opts['state_log_fmt_name'] = "state"
+    config_opts['chainbuild'] = False
    config_opts['online'] = True

    config_opts['internal_dev_setup'] = True
@@ -347,6 +353,7 @@ def set_config_opts_per_cmdline(config_opts, options, args):
        config_opts['cleanup_on_failure'] = False

    config_opts['online'] = options.online
+    config_opts['chainbuild'] = options.chainbuild

 decorate(traceLog())
 def do_rebuild(config_opts, chroot, srpms):
@@ -366,6 +373,10 @@ def do_rebuild(config_opts, chroot, srpms):
            log.info("Start(%s)  Config(%s)" % (srpm, chroot.sharedRootName))
            if config_opts['clean'] and chroot.state() != "clean":
                chroot.clean()
+            # if chainbuilding, prepare the local repository
+            if config_opts['chainbuild']:
+                mock.util.createRepo( chroot.resultdir )
+
            chroot.init()
            chroot.build(srpm, timeout=config_opts['rpmbuild_timeout'])
            elapsed = time.time() - start
diff --git a/py/mock/backend.py b/py/mock/backend.py
index 2bc63df..560fb03 100644
--- a/py/mock/backend.py
+++ b/py/mock/backend.py
@@ -57,6 +57,14 @@ class Root(object):
        self.chrootgid = config['chrootgid']
        self.chrootgroup = 'mockbuild'
        self.yum_conf_content = config['yum.conf']
+
+        if config['chainbuild']:
+            self.yum_conf_content = self.yum_conf_content + '\n'.join([
+                    '[chainbuild]',
+                    'name=chainbuild',
+                    'baseurl=file://%s' % os.path.abspath(self.resultdir)
+                    ])
+
        self.use_host_resolv = config['use_host_resolv']
        self.chroot_file_contents = config['files']
        self.chroot_setup_cmd = config['chroot_setup_cmd']
diff --git a/py/mock/util.py b/py/mock/util.py
index f52003e..943d4bb 100644
--- a/py/mock/util.py
+++ b/py/mock/util.py
@@ -262,6 +262,13 @@ def logOutput(fds, logger, returnOutput=1,
start=0, timeout=0):
        logger.debug(tail)
    return output

+
+decorate(traceLog())
+def createRepo(path):
+    cmd = 'createrepo %s' % path
+    mock.util.do( cmd, shell=True )
+
+
 # logger =
 # output = [1|0]
 # chrootPath
--
1.6.0.6