Description of problem:

When running livecd-creator and during a package transaction which is in Yum code in runTransaction(), after pressing CTRL-C the application exits immediately without allowing livecd-creator to finish it's job, like being able to cleanup.

Relevant block of livecd-creator where the transaction is at:
    def runInstall(self):
        os.environ["HOME"] = "/"
        try:
            (res, resmsg) = self.buildTransaction()
        except yum.Errors.RepoError, e:
            raise CreatorError("Unable to download from repo : %s" %(e,))
        if res != 2:
            raise CreatorError("Failed to build transaction : %s" % str.join("\n", resmsg))

        dlpkgs = map(lambda x: x.po, filter(lambda txmbr: txmbr.ts_state in ("i", "u"), self.tsInfo.getMembers()))
        self.downloadPkgs(dlpkgs)
        # FIXME: sigcheck?

        self.initActionTs()
        self.populateTs(keepold=0)
        deps = self.ts.check()
        if len(deps) != 0:
            raise CreatorError("Dependency check failed!")
        rc = self.ts.order()
        if rc != 0:
            raise CreatorError("ordering packages for installation failed!")

        # FIXME: callback should be refactored a little in yum 
        sys.path.append('/usr/share/yum-cli')
        import callback
        cb = callback.RPMInstallCallback()
        cb.tsInfo = self.tsInfo
        cb.filelog = False
        ret = self.runTransaction(cb)
        print ""
        self._cleanupRpmdbLocks(self.conf.installroot)
        return ret


Here is output from the shell, ctrl-C is pressed during the hash printing of package glibc where it then prints a C and exits.

Need some way to not exit so we can cleanup.

[root@localhost tmp]# livecd-creator -c livecd.ks -f testing
mke2fs 1.41.12 (17-May-2010)
Filesystem label=_testing
OS type: Linux
Block size=4096 (log=2)
Fragment size=4096 (log=2)
Stride=0 blocks, Stripe width=0 blocks
262144 inodes, 1048576 blocks
10485 blocks (1.00%) reserved for the super user
First data block=0
Maximum filesystem blocks=1073741824
32 block groups
32768 blocks per group, 32768 fragments per group
8192 inodes per group
Superblock backups stored on blocks: 
	32768, 98304, 163840, 229376, 294912, 819200, 884736

Writing inode tables: done                            
Creating journal (32768 blocks): done
Writing superblocks and filesystem accounting information: done

This filesystem will be automatically checked every 25 mounts or
180 days, whichever comes first.  Use tune2fs -c or -i to override.
tune2fs 1.41.12 (17-May-2010)
Setting maximal mount count to -1
Setting interval between checks to 0 seconds
Retrieving file:///pub/repo/rawhide/repodata/repomd.xml ...OK
Retrieving file:///pub/repo/rawhide/repodata/8a0b976967886f5a4abe3710a0b5b2b00e771e5ffa2cb16472e908ad19906946-primary.sqlite.bz2 ...OK
Retrieving file:///pub/repo/rawhide/repodata/2d85828b5fbb0a86822c702ba615da8a96bd8d805a81272732971b7bbd0e9f15-comps-rawhide.xml.gz ...OK
  Installing: setup                        ##################### [  1/383] 
  Installing: filesystem                   ##################### [  2/383] 
  Installing: fedora-release-rawhide       ##################### [  3/383] 
  Installing: fedora-release               ##################### [  4/383] 
warning: basesystem-10.0-3.noarch: Header V3 RSA/SHA256 Signature, key ID e8e40fde: NOKEY
  Installing: basesystem                   ##################### [  5/383] 
  Installing: kbd-misc                     ##################### [  6/383] 
  Installing: tzdata                       ##################### [  7/383] 
  Installing: comps-extras                 ##################### [  8/383] 
  Installing: dmz-cursor-themes            ##################### [  9/383] 
  Installing: xkeyboard-config             ##################### [ 10/383] 
  Installing: libX11-common                ##################### [ 11/383] 
  Installing: mobile-broadband-provider-in ##################### [ 12/383] 
  Installing: ncurses-base                 ##################### [ 13/383] 
  Installing: ca-certificates              ##################### [ 14/383] 
  Installing: xml-common                   ##################### [ 15/383] 
  Installing: control-center-filesystem    ##################### [ 16/383] 
  Installing: libgcc                       ##################### [ 17/383] 
  Installing: rootfiles                    ##################### [ 18/383] 
  Installing: bash                         ##################### [ 19/383] 
  Installing: glibc-common                 ##################### [ 20/383] 
  Installing: nss-softokn-freebl           ##################### [ 21/383] 
  Installing: glibc                        ##################### [ 22/383] C
/var/tmp/imgcreate-1ROdwu/install_root/var/lib/rpm: No such file or directory
[root@localhost tmp]# losetup -a
/dev/loop0: [0802]:3933539 (/var/tmp/imgcreate-09UmNB/tmp-0ThwfQ/ext3fs.img)
/dev/loop1: [0802]:3965104 (/var/tmp/imgcreate-5P42UA/tmp-oAV5Oy/ext3fs.img)
/dev/loop2: [0802]:3990626 (/var/tmp/imgcreate-1ROdwu/tmp-oZdqvI/ext3fs.img)
[root@localhost tmp]# mount | grep install_root
/dev/loop0 on /var/tmp/imgcreate-09UmNB/install_root type ext4 (rw)
/sys on /var/tmp/imgcreate-09UmNB/install_root/sys type none (rw,bind)
/proc on /var/tmp/imgcreate-09UmNB/install_root/proc type none (rw,bind)
/dev/pts on /var/tmp/imgcreate-09UmNB/install_root/dev/pts type none (rw,bind)
/dev/shm on /var/tmp/imgcreate-09UmNB/install_root/dev/shm type none (rw,bind)
/var/tmp/imgcreate-09UmNB/yum-cache on /var/tmp/imgcreate-09UmNB/install_root/var/cache/yum type none (rw,bind)
/dev/loop2 on /var/tmp/imgcreate-1ROdwu/install_root type ext4 (rw)
/sys on /var/tmp/imgcreate-1ROdwu/install_root/sys type none (rw,bind)
/proc on /var/tmp/imgcreate-1ROdwu/install_root/proc type none (rw,bind)
/dev/pts on /var/tmp/imgcreate-1ROdwu/install_root/dev/pts type none (rw,bind)
/dev/shm on /var/tmp/imgcreate-1ROdwu/install_root/dev/shm type none (rw,bind)
/var/tmp/imgcreate-1ROdwu/yum-cache on /var/tmp/imgcreate-1ROdwu/install_root/var/cache/yum type none (rw,bind)
[root@localhost tmp]#

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