--- Begin Message ---
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Subject: |
[PATCH] gnu: qemu: Add Guix support to QEMU guest agent. |
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Date: |
Sat, 23 Oct 2021 12:03:18 +0200 |
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.
---
This allows 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
Thanks!
gnu/local.mk | 1 +
.../patches/qemu-fix-agent-paths.patch | 61 +++++++++++++++++++
gnu/packages/virtualization.scm | 3 +-
3 files changed, 64 insertions(+), 1 deletion(-)
create mode 100644 gnu/packages/patches/qemu-fix-agent-paths.patch
diff --git a/gnu/local.mk b/gnu/local.mk
index d432829e2d..9a900e7c30 100644
--- a/gnu/local.mk
+++ b/gnu/local.mk
@@ -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 \
diff --git a/gnu/packages/patches/qemu-fix-agent-paths.patch
b/gnu/packages/patches/qemu-fix-agent-paths.patch
new file mode 100644
index 0000000000..22cf883a8d
--- /dev/null
+++ b/gnu/packages/patches/qemu-fix-agent-paths.patch
@@ -0,0 +1,61 @@
+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);
diff --git a/gnu/packages/virtualization.scm b/gnu/packages/virtualization.scm
index fb6e8ebfa3..fd778e21a4 100644
--- a/gnu/packages/virtualization.scm
+++ b/gnu/packages/virtualization.scm
@@ -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
--
2.33.1
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