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* nbd: Add qemu-nbd -D for human-readable descriptionEric Blake2016-11-021-1/+4
| | | | | | | | | | | | | The NBD protocol allows servers to advertise a human-readable description alongside an export name during NBD_OPT_LIST. Add an option to pass through the user's string to the NBD client. Doing this also makes it easier to test commit 200650d4, which is the client counterpart of receiving the description. Signed-off-by: Eric Blake <eblake@redhat.com> Message-Id: <1476469998-28592-2-git-send-email-eblake@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
* qemu-nbd: Add --fork optionMax Reitz2016-10-241-0/+2
| | | | | | | | | | Using the --fork option, one can make qemu-nbd fork the worker process. The original process will exit on error of the worker or once the worker enters the main loop. Suggested-by: Sascha Silbe <silbe@linux.vnet.ibm.com> Signed-off-by: Max Reitz <mreitz@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
* trace: enable tracing in qemu-nbdDenis V. Lunev2016-06-281-0/+3
| | | | | | | | | | | | | | Please note, trace_init_backends() must be called in the final process, i.e. after daemonization. This is necessary to keep tracing thread in the proper process. Signed-off-by: Denis V. Lunev <den@openvz.org> Reviewed-by: Eric Blake <eblake@redhat.com> Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com> Message-id: 1466174654-30130-6-git-send-email-den@openvz.org CC: Paolo Bonzini <pbonzini@redhat.com> CC: Kevin Wolf <kwolf@redhat.com> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
* qemu-nbd: allow specifying image as a set of options argsDaniel P. Berrange2016-02-221-1/+6
| | | | | | | | | | | | | | | | | | | | | Currently qemu-nbd allows an image filename to be passed on the command line, but unless using the JSON format, it does not have a way to set any options except the format eg qemu-nbd https://127.0.0.1/images/centos7.iso qemu-nbd /home/berrange/demo.qcow2 This adds a --image-opts arg that indicates that the positional filename should be interpreted as a full option string, not just a filename. qemu-nbd --image-opts driver=https,url=https://127.0.0.1/images,sslverify=off qemu-nbd --image-opts driver=file,filename=/home/berrange/demo.qcow2 This flag is mutually exclusive with the '-f' flag. Signed-off-by: Daniel P. Berrange <berrange@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
* nbd: enable use of TLS with qemu-nbd serverDaniel P. Berrange2016-02-161-2/+7
| | | | | | | | | | | | | | | | | | | | | | | | | | | This modifies the qemu-nbd program so that it is possible to request the use of TLS with the server. It simply adds a new command line option --tls-creds which is used to provide the ID of a QCryptoTLSCreds object previously created via the --object command line option. For example qemu-nbd --object tls-creds-x509,id=tls0,endpoint=server,\ dir=/home/berrange/security/qemutls \ --tls-creds tls0 \ --exportname default TLS requires the new style NBD protocol, so if no export name is set (via --export-name), then we use the default NBD protocol export name "" TLS is only supported when using an IPv4/IPv6 socket listener. It is not possible to use with UNIX sockets, which includes when connecting the NBD server to a host device. Signed-off-by: Daniel P. Berrange <berrange@redhat.com> Message-Id: <1455129674-17255-16-git-send-email-berrange@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
* nbd: allow setting of an export name for qemu-nbd serverDaniel P. Berrange2016-02-161-0/+3
| | | | | | | | | | | | | | | | The qemu-nbd server currently always uses the old style protocol since it never sets any export name. This is a problem because future TLS support will require use of the new style protocol negotiation. This adds "--exportname NAME" / "-x NAME" arguments to qemu-nbd which allow the user to set an explicit export name. When an export name is set the server will always use the new style NBD protocol. Signed-off-by: Daniel P. Berrange <berrange@redhat.com> Message-Id: <1455129674-17255-11-git-send-email-berrange@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
* qemu-nbd: add support for --object command line argDaniel P. Berrange2016-02-161-0/+6
| | | | | | | | | | | | | | | | Allow creation of user creatable object types with qemu-nbd via a new --object command line arg. This will be used to supply passwords and/or encryption keys to the various block driver backends via the recently added 'secret' object type. # printf letmein > mypasswd.txt # qemu-nbd --object secret,id=sec0,file=mypasswd.txt \ ...other nbd args... Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Daniel P. Berrange <berrange@redhat.com> Message-Id: <1455129674-17255-3-git-send-email-berrange@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
* qemu-nbd: Fix texi sentence capitalisationSitsofe Wheeler2016-02-091-19/+19
| | | | | | | | | Capitalise the first letter of sentences (and reword for grammar) the options section of qemu-nbd.texi. Signed-off-by: Sitsofe Wheeler <sitsofe@yahoo.com> Message-Id: <1451979212-25479-4-git-send-email-sitsofe@yahoo.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
* qemu-nbd: Minor texi updatesSitsofe Wheeler2016-02-091-12/+22
| | | | | | | | | | | | | | | | | - Change some spacing. - Add disconnect usage to synopsis. - Highlight the command and its options in the synopsis. - Fix up the grammar in the description. - Move filename variable description out of the option table. - Add a description of the dev variable. - Remove duplicate entry for --format. - Reword --discard documentation. - Add --detect-zeroes documentation. - Add reference to qemu man page to see also section. Signed-off-by: Sitsofe Wheeler <sitsofe@yahoo.com> Message-Id: <1451979212-25479-3-git-send-email-sitsofe@yahoo.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
* qemu-nbd: Fix unintended texi verbatim formattingSitsofe Wheeler2016-02-091-29/+29
| | | | | | | | | | Indented lines in the texi meant the perlpod produced interpreted the paragraph as being verbatim (thus formatting codes were not interpreted). Fix this by un-indenting problem lines. Signed-off-by: Sitsofe Wheeler <sitsofe@yahoo.com> Message-Id: <1451979212-25479-2-git-send-email-sitsofe@yahoo.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
* nbd: Miscellaneous typo fixes.Hani Benhabiles2014-05-231-1/+1
| | | | | | | Signed-off-by: Hani Benhabiles <hani@linux.com> Acked-by: Paolo Bonzini <pbonzini@redhat.com> Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com> Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
* qemu-nbd: add doc for option -fWenchao Xia2013-12-041-0/+2
| | | | | Signed-off-by: Wenchao Xia <xiawenc@linux.vnet.ibm.com> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
* qemu-nbd: support internal snapshot exportWenchao Xia2013-12-041-1/+7
| | | | | | | | | Now it is possible to directly export an internal snapshot, which can be used to probe the snapshot's contents without qemu-img convert. Signed-off-by: Wenchao Xia <xiawenc@linux.vnet.ibm.com> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
* Add -f FMT / --format FMT arg to qemu-nbdDaniel P. Berrange2013-04-151-0/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | Currently the qemu-nbd program will auto-detect the format of any disk it is given. This behaviour is known to be insecure. For example, if qemu-nbd initially exposes a 'raw' file to an unprivileged app, and that app runs 'qemu-img create -f qcow2 -o backing_file=/etc/shadow /dev/nbd0' then the next time the app is started, the qemu-nbd will now detect it as a 'qcow2' file and expose /etc/shadow to the unprivileged app. The only way to avoid this is to explicitly tell qemu-nbd what disk format to use on the command line, completely disabling auto-detection. This patch adds a '-f' / '--format' arg for this purpose, mirroring what is already available via qemu-img and qemu commands. qemu-nbd --format raw -p 9000 evil.img will now always use raw, regardless of what format 'evil.img' looks like it contains Signed-off-by: Daniel P. Berrange <berrange@redhat.com> [Use errx, not err. - Paolo] Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
* qemu-nbd: add --discard optionPaolo Bonzini2013-02-221-0/+4
| | | | | | | | Similar to --cache and --aio, this option mimics the discard suboption of "-drive". Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
* qemu-nbd: document --cache and --aio optionsPaolo Bonzini2013-02-081-1/+6
| | | | | Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
* Replace Qemu by QEMU in user visible documentationStefan Weil2012-04-071-1/+1
| | | | | | | | The official spelling is QEMU. Signed-off-by: Stefan Weil <sw@weilnetz.de> Reviewed-by: Andreas Färber <afaerber@suse.de> Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
* qemu-nbd: Fix wrong description in qemu-nbd.texiRyota Ozaki2010-03-061-2/+2
| | | | | | | | -c option needs argument <dev> but it's missing now. This patch fixes it. Signed-off-by: Ryota Ozaki <ozaki.ryota@gmail.com> Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
* Fix formatting of documentation (Stefan Weil)aliguori2008-09-221-13/+13
| | | | | | | | | | | Fix formatting for documentation of nbd command line options. Signed-off-by: Stefan Weil <weil@mail.berlios.de> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com> git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@5301 c046a42c-6fe2-441c-8c8c-71466251a162
* Allow QEMU to connect directly to an NBD server, by Laurent Vivier.ths2008-07-031-0/+2
| | | | git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@4838 c046a42c-6fe2-441c-8c8c-71466251a162
* Allow to share a disk image via nbd, by Laurent Vivier.ths2008-07-031-0/+2
| | | | git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@4837 c046a42c-6fe2-441c-8c8c-71466251a162
* Add a parameter to disable host cache, by Laurent Vivier.ths2008-07-031-0/+4
| | | | git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@4836 c046a42c-6fe2-441c-8c8c-71466251a162
* Merge NBD client/server, by Laurent Vivier.ths2008-07-031-0/+6
| | | | git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@4834 c046a42c-6fe2-441c-8c8c-71466251a162
* qemu-nbd tool (Anthony Liguori)bellard2008-05-271-0/+52
git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@4596 c046a42c-6fe2-441c-8c8c-71466251a162
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