search for: guestfs_sync

>From IRC channel: <StenaviN> Can someone confirm cat/test-virt-tail.sh works in 'master'? <StenaviN> I get https://pastebin.com/GBkg7Vtw <rwmjones> StenaviN: yes it works for me; the error is not very helpful, you'll need to set LIBGUESTFS_DEBUG=1 LIBGUESTFS_TRACE=1 <StenaviN> https://pastebin.com/yABgCHwV <rwmjones> I think the error is:

According to 'guestfs_sync' API method documentation: "You should always call this if you have modified a disk image, before closing the handle." So, 'guestfish --remote sync' is required because changes made on the disk (guestfish --remote rm /tail) should be visible to 'virt-tail' which works...

The existing mechanism was clunky, slow and used ~ 10 MB of local disk. Rich.

Hello, I am running several virtualization servers with QEMU 1.4.x and libvirt 1.0.2 on Ubuntu 12.04 and am working on optimizing the cache= and aio= options for the virtual machines. These VM images are mostly qcow2, and are served both from a local ext4 filesystem (with data=ordered,barrier) and from an NFS mountpoint (with sync). The local filesystem sits on top of an md software RAID of SATA

do a code cleanup by removing the tailing spaces Signed-off-by: Wanlong Gao <gaowanlong at cn.fujitsu.com> --- examples/create_disk.c | 2 +- examples/inspect_vm.c | 2 +- 2 files changed, 2 insertions(+), 2 deletions(-) diff --git a/examples/create_disk.c b/examples/create_disk.c index f4b9044..bcad6d8 100644 --- a/examples/create_disk.c +++ b/examples/create_disk.c @@ -7,7 +7,7

In libguestfs we have a few tests that require root privileges and they are skipped by default (normally you should not build or test as root), but you can do this to run them: sudo make check-root In nbdkit I wanted to check that the file plugin works with block devices (this is not tested), and the only way I can sensibly think to do this is using a loopback device and root. This commit

v2 was here: https://www.redhat.com/archives/libguestfs/2020-March/msg00154.html v3: - Micro-optimize tmpdir. - Quote $disk in default command shell fragment. - Don't redirect mkfs output to /dev/null. Instead use exec </dev/null >/dev/null before the shell fragment. We may want to do this in other places where we run external shell scripts, or more generally for all

https://bugzilla.redhat.com/show_bug.cgi?id=836710 https://bugzilla.redhat.com/show_bug.cgi?id=836913 There are at least two related bugs going on: (1) Linux sync(2) system call doesn't send a write barrier to the disk, so in effect it doesn't force the hard disk to flush its cache. libguestfs used sync(2) to force changes to disk. We didn't expect that qemu was caching anything

...1") == -1) + exit (EXIT_FAILURE); + if (guestfs_touch (g1, "/test1/file1") == -1) + exit (EXIT_FAILURE); + if (guestfs_mkdir (g2, "/test2") == -1) + exit (EXIT_FAILURE); + if (guestfs_touch (g2, "/test2/file2") == -1) + exit (EXIT_FAILURE); + + if (guestfs_sync (g1) == -1 || guestfs_sync (g2) == -1) + exit (EXIT_FAILURE); + + if (guestfs_is_file (g1, "/test1/file1") != 1) { + fprintf (stderr, "%s FAILED: /test1/file1 is not a file\n", + program_name); + exit (EXIT_FAILURE); + } + if (guestfs_is_file (g2, "/...

Simpler, and including tests. Rich.

This is the same as the previous patch, but the partition type is now chosen automatically from mbr or gpt, unless the user expresses a preference. https://gb.redhat.com/archives/libguestfs/2012-January/msg00136.html Rich.

v1 was here: https://www.redhat.com/archives/libguestfs/2018-November/msg00147.html v2 was here: https://www.redhat.com/archives/libguestfs/2018-November/msg00152.html v3: - Use optarg != NULL as a sentinel for has_arg. - Moved some variable decls into the inner loop. - Make nbdkit wrapper depend on config.status, so if srcdir or builddir changes then we rebuild the wrapper. It

Rather than me explaining over again what it does, I've included the man page below. Rich. ---------------------------------------------------------------------- virt-format(1) Virtualization Support virt-format(1) NAME virt-format - Erase and make a blank disk SYNOPSIS virt-format [--options] -a disk.img [-a disk.img ...] DESCRIPTION

...(EXIT_FAILURE); - if (guestfs_mount (g, argv[2], "/") == -1) exit (1); + if (guestfs_mount (g, argv[2], "/") == -1) exit (EXIT_FAILURE); - if (guestfs_touch (g, "/hello") == -1) exit (1); + if (guestfs_touch (g, "/hello") == -1) exit (EXIT_FAILURE); guestfs_sync (g); guestfs_close (g); diff --git a/examples/to-xml.c b/examples/to-xml.c index 6d0a1df..537ae91 100644 --- a/examples/to-xml.c +++ b/examples/to-xml.c @@ -25,7 +25,7 @@ * to stderr already. */ #define CALL(call,errcode) \ - if ((call) == (errcode)) exit (1); + if ((call) == (errcode))...

This version doesn't crash or cause hung processes or stuck mountpoints, so that's an improvement. Rich.

This patch is just for review. It enables FUSE support in the API via two new calls, 'guestfs_mount_local' and 'guestfs_umount_local'. FUSE turns out to be very easy to deadlock (necessitating that the machine be rebooted). Running the test from the third patch is usually an effective way to demonstrate this. However I have not yet managed to produce a simple reproducer that

This changes the proposed API slightly. Previously 'mount-local' generating a 'mounted' event when the filesystem was ready, and from the 'mounted' event you had to effectively do a fork. Now, 'mount-local' just initializes the mountpoint and you have to call 'mount-local-run' to enter the FUSE main loop. Between these calls you can do a fork or whatever

Version 3: - Tidies up the code further. - Implements correct handling of SIGTSTP and SIGCONT. - Adds: ^] s - sync filesystems - Adds: ^] z - suspend virt-rescue Rich.

Two (not related to each other) refactorings: Patches 1-12 split configure.ac into smaller files using the m4_include mechanism. Patches 13-15 split out parts of guestfs.pod (ie. guestfs(3)) into three new manual pages: guestfs-hacking(3) - how to extend and contribute to libguestfs guestfs-internals(3) - architecture and internals guestfs-security(3) - security and CVEs Patch 16 is a