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gnu: qemu: Add Guix support to QEMU guest agent.

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QEMU guest agent hardcodes paths to /sbin/hwclock and /sbin/shutdown. Patch
the source to try binaries under /run/current-system/profile/sbin first.

* gnu/packages/patches/qemu-fix-agent-paths.patch: New file.
* gnu/local.mk (dist_patch_DATA): Register the patch.
* gnu/packages/virtualization.scm (qemu)[origin]: Apply it.

Signed-off-by: Ludovic Courtès <ludo@gnu.org>
This commit is contained in:
Timotej Lazar 2021-10-23 12:03:18 +02:00 committed by Ludovic Courtès
parent f8d3c98162
commit 142344b6ef
No known key found for this signature in database
GPG key ID: 090B11993D9AEBB5
3 changed files with 69 additions and 1 deletions
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1
gnu/local.mk
View file

@ -1707,6 +1707,7 @@ dist_patch_DATA = \
%D%/packages/patches/qemu-CVE-2021-20203.patch \
%D%/packages/patches/qemu-glibc-2.27.patch \
%D%/packages/patches/qemu-glibc-2.30.patch \
%D%/packages/patches/qemu-fix-agent-paths.patch \
%D%/packages/patches/qpdfview-qt515-compat.patch \
%D%/packages/patches/qrcodegen-cpp-make-install.patch \
%D%/packages/patches/qt4-ldflags.patch \

66
gnu/packages/patches/qemu-fix-agent-paths.patch Normal file
View file

@ -0,0 +1,66 @@
Allow a QEMU host to set the time and shutdown Guix guests. Styled
after the patch from the Nix package:
https://github.com/NixOS/nixpkgs/blob/master/pkgs/applications/virtualization/qemu/fix-qemu-ga.patch
diff --git a/qga/commands-posix.c b/qga/commands-posix.c
index 75dbaab..b416b03 100644
--- a/qga/commands-posix.c
+++ b/qga/commands-posix.c
@@ -84,6 +84,7 @@ static void ga_wait_child(pid_t pid, int *status, Error **errp)
void qmp_guest_shutdown(bool has_mode, const char *mode, Error **errp)
{
const char *shutdown_flag;
+ const char *command;
Error *local_err = NULL;
pid_t pid;
int status;
@@ -91,10 +92,13 @@ void qmp_guest_shutdown(bool has_mode, const char *mode, Error **errp)
slog("guest-shutdown called, mode: %s", mode);
if (!has_mode || strcmp(mode, "powerdown") == 0) {
shutdown_flag = "-P";
+ command = "shutdown";
} else if (strcmp(mode, "halt") == 0) {
shutdown_flag = "-H";
+ command = "halt";
} else if (strcmp(mode, "reboot") == 0) {
shutdown_flag = "-r";
+ command = "reboot";
} else {
error_setg(errp,
"mode is invalid (valid values are: halt|powerdown|reboot");
@@ -109,6 +113,11 @@ void qmp_guest_shutdown(bool has_mode, const char *mode, Error **errp)
reopen_fd_to_null(1);
reopen_fd_to_null(2);
+ /* try Guix’s shutdown/halt/reboot first */
+ char *path = g_strdup_printf("/run/current-system/profile/sbin/%s", command);
+ execle(path, command, (char *)NULL, environ);
+ g_free(path);
+
execle("/sbin/shutdown", "shutdown", "-h", shutdown_flag, "+0",
"hypervisor initiated shutdown", (char *)NULL, environ);
_exit(EXIT_FAILURE);
@@ -158,10 +167,12 @@ void qmp_guest_set_time(bool has_time, int64_t time_ns, Error **errp)
Error *local_err = NULL;
struct timeval tv;
static const char hwclock_path[] = "/sbin/hwclock";
+ static const char hwclock_path_guix[] = "/run/current-system/profile/sbin/hwclock";
static int hwclock_available = -1;
if (hwclock_available < 0) {
- hwclock_available = (access(hwclock_path, X_OK) == 0);
+ hwclock_available = (access(hwclock_path_guix, X_OK) == 0) ||
+ (access(hwclock_path, X_OK) == 0);
}
if (!hwclock_available) {
@@ -207,6 +218,8 @@ void qmp_guest_set_time(bool has_time, int64_t time_ns, Error **errp)
/* Use '/sbin/hwclock -w' to set RTC from the system time,
* or '/sbin/hwclock -s' to set the system time from RTC. */
+ execle(hwclock_path_guix, "hwclock", has_time ? "-w" : "-s",
+ NULL, environ);
execle(hwclock_path, "hwclock", has_time ? "-w" : "-s",
NULL, environ);
_exit(EXIT_FAILURE);

3
gnu/packages/virtualization.scm
View file

@ -159,7 +159,8 @@ (define-public qemu
(base32
"15iw7982g6vc4jy1l9kk1z9sl5bm1bdbwr74y7nvwjs1nffhig7f"))
(patches (search-patches "qemu-CVE-2021-20203.patch"
"qemu-build-info-manual.patch"))
"qemu-build-info-manual.patch"
"qemu-fix-agent-paths.patch"))
(modules '((guix build utils)))
(snippet
'(begin