lorax中livemedia-creator无法找到qemu

系统：openEuler 2403
内核：6.6.0-28.0.0.34.oe2403.x86_64

【场景描述】(如下载场景/使用文档场景/安装及迁移场景/其他场景)
使用openEuler制作live cd

【ISSUE描述】
1. 使用livemedia-creator制作live cd时，总是提示qemu必须安装，无法制作成功

2. 问题原因1
livemedia-creator启动脚本和python代码中，代码判断qemu安装匹配错误
```
# cat /usr/sbin/livemedia-creator |grep -A 1 -B 1 qemu-system
    if is_install and not opts.no_virt \
       and not any(glob.glob("/usr/bin/qemu-system-*")):
        errors.append("qemu needs to be installed.")

# cat /usr/lib/python3.11/site-packages/pylorax/installer.py |grep qemu-system
    QEMU_CMDS = {"x86_64":  "qemu-system-x86_64",
                 "i386":    "qemu-system-i386",
                 "arm":     "qemu-system-arm",
                 "aarch64": "qemu-system-aarch64",
                 "ppc64le": "qemu-system-ppc64"

# rpm -qf /usr/sbin/livemedia-creator
lorax-34.1-5.oe2403.x86_64
```
3. ks参数不再支持
报错信息
```
04:21:11,800 INFO anaconda:anaconda: main: /sbin/anaconda 36.16.5-34.oe2403
04:21:11,801 WARNING anaconda:anaconda: stdout: Kernel boot argument 'ks' detected. Did you want to use 'inst.ks' for the installer instead?
04:21:11,801 WARNING anaconda:anaconda: stdout: All Anaconda kernel boot arguments are now required to use 'inst.' prefix!
04:21:11,801 WARNING anaconda:anaconda: stdout: #012############## Installer errors encountered during boot ###############012'ks' is deprecated and has been removed.#012All usage of Anaconda boot arguments without 'inst.' prefix was removed. Please use inst.ks instead.#012#012############ Installer errors encountered during boot end ############
```
问题原因：
```
# cat /usr/lib/python3.11/site-packages/pylorax/installer.py |grep ks=file
        cmdline_args = "ks=file:/%s" % os.path.basename(ks_paths[0])
```
应修改为 inst.ks=file:/%s

4. image-minimizer报错

```
06:49:00,313 INFO anaconda:program: File "/mnt/sysimage/bin/image-minimizer", line 73, in add_pattern_rpm
06:49:00,313 INFO anaconda:program: rpms.add(hdr['name'].decode("utf8"))
06:49:00,313 INFO anaconda:program: ^^^^^^^^^^^^^^^^^^
06:49:00,313 INFO anaconda:program: AttributeError: 'str' object has no attribute 'decode'. Did you mean: 'encode'?
```
根据代码比对，应该去掉decode
```
    def add_pattern_rpm(self, rpms, pattern):
        if self.ts is None:
            if self.prefix is None:
                raise Exception('Must specify installation root for droprpm/keeprpm')
            self.ts = rpm.TransactionSet(self.prefix)
        mi = self.ts.dbMatch()
        mi.pattern('name', rpm.RPMMIRE_GLOB, pattern)
        not_found = True
        for hdr in mi:
            not_found = False
            rpms.add(hdr['name'])
        if self.verbose and not_found:
            print("%s package not found" % pattern)
```

5. os.ftruncate错误

```
2025-09-18 16:07:24,961: Traceback (most recent call last):
  File "/sbin/livemedia-creator", line 207, in main
    (result_dir, disk_img) = run_creator(opts)
                             ^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.11/site-packages/pylorax/creator.py", line 708, in run_creator
    rc = make_runtime(opts, img_mount.mount_dir, work_dir, calculate_disk_size(opts, ks)/1024.0)
         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.11/site-packages/pylorax/creator.py", line 230, in make_runtime
    return rb.create_ext4_runtime(joinpaths(work_dir, RUNTIME), size=size,
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.11/site-packages/pylorax/treebuilder.py", line 251, in create_ext4_runtime
    imgutils.mkrootfsimg(self.vars.root, joinpaths(workdir, "LiveOS/rootfs.img"),
  File "/usr/lib/python3.11/site-packages/pylorax/imgutils.py", line 126, in mkrootfsimg
    mkext4img(rootdir, outfile, label=label, size=fssize)
  File "/usr/lib/python3.11/site-packages/pylorax/imgutils.py", line 511, in mkext4img
    mkfsimage("ext4", rootdir, outfile, size, mountargs=mountargs,
  File "/usr/lib/python3.11/site-packages/pylorax/imgutils.py", line 479, in mkfsimage
    with LoopDev(outfile, size) as loopdev:
         ^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.11/site-packages/pylorax/imgutils.py", line 345, in __init__
    mksparse(self.filename, size)
  File "/usr/lib/python3.11/site-packages/pylorax/imgutils.py", line 134, in mksparse
    os.ftruncate(fobj.fileno(), size)
TypeError: 'float' object cannot be interpreted as an integer
```
参考社区源码修复，强制转换size为int类型

```
def mksparse(outfile, size):
    '''use os.ftruncate to create a sparse file of the given size.'''
    with open(outfile, "w") as fobj:
        os.ftruncate(fobj.fileno(), int(size))
```

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