virsh（libvirt）的替代方案

Question

我正在使用 virsh list 命令来显示电脑上运行的虚拟机列表。我想把这个信息以二维数组的形式打印出来。

一种方法是先获取输出，然后用分词器把它分开，最后存储到数组里。但有没有其他方法可以直接把这些信息变成数组的形式，这样代码会更灵活一些？（我想到的一个办法是用 Python 的 libvirt API）

Answer 1

确实有 libvirt的Python API接口。

import libvirt

conn = libvirt.openReadOnly(None)  # $LIBVIRT_DEFAULT_URI, or give a URI here
assert conn, 'Failed to open connection'

names = conn.listDefinedDomains()
domains = map(conn.lookupByName, names)

ids = conn.listDomainsID()
running = map(conn.lookupByID, ids)

columns = 3

states = {
    libvirt.VIR_DOMAIN_NOSTATE: 'no state',
    libvirt.VIR_DOMAIN_RUNNING: 'running',
    libvirt.VIR_DOMAIN_BLOCKED: 'blocked on resource',
    libvirt.VIR_DOMAIN_PAUSED: 'paused by user',
    libvirt.VIR_DOMAIN_SHUTDOWN: 'being shut down',
    libvirt.VIR_DOMAIN_SHUTOFF: 'shut off',
    libvirt.VIR_DOMAIN_CRASHED: 'crashed',
}
def info(dom):
    [state, maxmem, mem, ncpu, cputime] = dom.info()
    return '%s is %s,' % (dom.name(), states.get(state, state))

print 'Defined domains:'
for row in map(None, *[iter(domains)] * columns):
    for domain in row:
        if domain:
            print info(domain),
    print
print

print 'Running domains:'
for row in map(None, *[iter(running)] * columns):
    for domain in row:
        if domain:
            print info(domain),
    print