78 lines
2.7 KiB
Markdown
78 lines
2.7 KiB
Markdown
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# Libguestd
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This is supposed to be a library that helps with operations on qemu-guest-agent.
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You need to connect to libvirt daemon on your own.
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This library implements some(most?) functions described in [QEMU Guest Agent Protocol Reference](https://qemu-project.gitlab.io/qemu/interop/qemu-ga-ref.html).
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Not implemented:
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- guest-sync-delimited (my understanding is that libvirt does this for me)
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- guest-sync (same as above)
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- guest-set-time
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- guest-shutdown (there is a libvirt command for that already)
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- guest-shutdown (there is a libvirt command for that already)
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- guest-file-seek (this library only reads/writes whole file)
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- guest-file-flush (this library only writes whole file, then closes it immediately)
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- guest-fsfreeze-* (there are libvirt commands for that)
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- guest-fstrim (I don't need this)
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- guest-suspend-*
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- guest-get-vcpus (I don't need this)
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- guest-set-vcpus (I don't need this)
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- guest-get-memory-blocks
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- guest-get-memory-block-info
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- guest-set-memory-blocks
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- guest-get-users (I don't think this is usefull)
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- guest-get-timezone
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- guest-get-devices (windows only)
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Not implemented but I want to implement it:
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- guest-get-cpustats
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# CLI tools
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Alongside this library, a few tools are provided:
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## cp2guest
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Allows copying files from/to guest using qemu guest agent.
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Example usage:
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```shell
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./bin/cp2guest -domain guesttools -src README.md -dst /tmp/README.md
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```
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Or, to copy from VM to host:
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```shell
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./bin/cp2guest -domain guesttools -src /root/anaconda-ks.cfg -dst /tmp/anaconda-ks.cfg -reverse
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```
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## guestrun
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Execute command in guest
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Example usage:
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```shell
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./bin/guestrun -domain guesttools -cmd 'ls -ltrh /bin/'
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```
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Command will be executed as `/bin/sh -c 'ls -ltrh /bin'`.
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## Libguestd-cli
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This tool implements most functions of this library.
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Since usage should be self-explainatory, I will just leave a few example commands here:
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```shell
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./bin/libguestd-cli -domain guesttools -username root -password 12345
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./bin/libguestd-cli -domain guesttools -username root -sshkey-add 'ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAID8qp7UQUINxLXog/sFgRKDtddiJHzkypyB7/OlmUbK2 lmoskala'\
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./bin/libguestd-cli -domain guesttools -username root -sshkey-remove 'ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAID8qp7UQUINxLXog/sFgRKDtddiJHzkypyB7/OlmUbK2 lmoskala'
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./bin/libguestd-cli -domain guesttools -username root -listkeys
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./bin/libguestd-cli -domain guesttools -username root -fsinfo
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```
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# Security
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Some distributions (rocky linux for example) disables some functionalities of qemu-guest-agent by default.
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Most notably, all operations involving files and commands.
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Also, selinux is known to cause problems when manipulating SSH keys: [bug report](https://bugzilla.redhat.com/show_bug.cgi?id=1917024)
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