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https://github.com/libguestfs/libguestfs.git
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669eda1e24
Previously we tested if KVM was available, and cached that for the qemu binary. I think this was actually wrong. For example, if the machine restarts, then the cache is still around, but KVM might be enabled or disabled because of a new host kernel. In any case, let's radically simplify this. Test for KVM on each run. Consequently we can remove all the qemu test caching stuff as it is no longer used anywhere. I also tightened up the code that runs the QMP query-kvm command, so now any unexpected output will cause a runtime failure. This command ought to work, and if it breaks we ought to know about it and fix it.
44 lines
1.4 KiB
Bash
Executable File
44 lines
1.4 KiB
Bash
Executable File
#!/bin/bash
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# Copyright (C) 2013 Red Hat Inc.
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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# A fake debugging qemu which just dumps out the parameters to a known
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# file.
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if [ -z "$DEBUG_QEMU_FILE" ]; then
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echo "$0: \$DEBUG_QEMU_FILE environment variable must be set."
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exit 1
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fi
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# The direct backend runs qemu ... -qmp stdio to query for KVM. For
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# the test to pass we have to provide an answer here.
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if [ "x$5" = "x-qmp" ]; then
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# Consume stdin first.
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cat >/dev/null
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# Write some fake output.
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echo '"QMP"'
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echo '"return"'
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echo '{"return": {"enabled": true, "present": true}}'
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exit 0
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fi
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echo "$@" > "$DEBUG_QEMU_FILE"
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# Real qemu would connect back to the daemon socket with a working
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# daemon. We don't do that, so the libguestfs parent process will
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# always get an error.
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exit 0
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