bootctl: add @current/@oneshot/@default targets to set-default/set-oneshot

Using `bootctl set-default @current` will set the default loader entry
to the currently booted entry as read from the `LoaderEntrySelected` EFI
variable.

Also `bootctl set-oneshot @current` will set the oneshot loader entry to
the current booted entry.

Correspondingly `@default` and `@oneshot` can be used to read from the
LoaderEntryDefault and LoaderEntryOneshot EFI variables.

TODO

@@ -20,9 +20,9 @@ Janitorial Clean-ups:
 
 Features:
 
-* port selinux code from mallinfo() to mallinfo2() once added to glibc
+* systemd-analyze netif that explains predictable interface (or networkctl)
 
-* in fd_get_path() if we see (deleted) then do stat and check for st_nlink
+* port selinux code from mallinfo() to mallinfo2() once added to glibc
 
 * Add service setting to run a service within the specified VRF. i.e. do the
   equivalent of "ip vrf exec".

hwdb.d/60-sensor.hwdb

@@ -276,6 +276,12 @@ sensor:modalias:acpi:*KIOX000A*:dmi:*svn*CytrixTechnology:*pn*Complex11t:*
 sensor:modalias:platform:HID-SENSOR-200073:dmi:*svnDell*:pnVostro5581:*
  ACCEL_LOCATION=base
 
+sensor:modalias:platform:HID-SENSOR-200073:dmi:*svnDell*:pnLatitude9520:*:ct10:*
+ ACCEL_LOCATION=base
+
+sensor:modalias:platform:HID-SENSOR-200073:dmi:*svnDell*:pnLatitude7420:*
+ ACCEL_LOCATION=base
+
 # Dell Venue 8 Pro 3845
 sensor:modalias:acpi:INVN6500*:dmi:*svnDellInc.*:pnVenue8Pro3845:*
  ACCEL_MOUNT_MATRIX=0, -1, 0; -1, 0, 0; 0, 0, 1

man/bootctl.xml

@@ -102,6 +102,17 @@
         <listitem><para>Sets the default boot loader entry. Takes a single boot loader entry ID string as
         argument. The <option>set-oneshot</option> command will set the default entry only for the next boot,
         the <option>set-default</option> will set it persistently for all future boots.</para></listitem>
+
+        <listitem><para>Optionally, the boot loader entry ID may be specified as one of: <option>@default</option>,
+        <option>@oneshot</option> or <option>@current</option>, which correspond to the current default boot loader
+        entry for all future boots, the current default boot loader entry for the next boot, and the currently booted
+        boot loader entry. These special IDs are resolved to the current values of the EFI variables
+        <varname>LoaderEntryDefault</varname>, <varname>LoaderEntryOneShot</varname> and <varname>LoaderEntrySelected</varname>,
+        see <ulink url="https://systemd.io/BOOT_LOADER_SPECIFICATION">Boot Loader Specification</ulink> for details.
+        These special IDs are primarily useful as a quick way to persistently make the currently booted boot loader
+        entry the default choice, or to upgrade the default boot loader entry for the next boot to the default boot
+        loader entry for all future boots, but may be used for other operations too.
+        </para></listitem>
       </varlistentry>
 
     </variablelist>

semaphoreci/semaphore-runner.sh

@@ -16,11 +16,13 @@ PHASES=(${@:-SETUP RUN})
 UBUNTU_RELEASE="$(lsb_release -cs)"
 
 create_container() {
-    # create autopkgtest LXC image; this sometimes fails with "Unable to fetch
-    # GPG key from keyserver", so retry a few times
-    for retry in {1..5}; do
-        sudo lxc-create -n $CONTAINER -t download -- -d $DISTRO -r $RELEASE -a $ARCH --keyserver hkp://keyserver.ubuntu.com:80 && break
-        sleep $((retry*retry))
+    # Create autopkgtest LXC image; this sometimes fails with "Unable to fetch
+    # GPG key from keyserver", so retry a few times with different keyservers.
+    for keyserver in "" "keys.gnupg.net" "keys.openpgp.org" "keyserver.ubuntu.com"; do
+        for retry in {1..5}; do
+            sudo lxc-create -n $CONTAINER -t download -- -d $DISTRO -r $RELEASE -a $ARCH --server us.images.linuxcontainers.org ${keyserver:+--keyserver "$keyserver"} && break 2
+            sleep $((retry*retry))
+        done
     done
 
     # unconfine the container, otherwise some tests fail

src/basic/format-util.h

@@ -72,11 +72,14 @@ typedef enum {
         FORMAT_BYTES_TRAILING_B  = 1 << 2,
 } FormatBytesFlag;
 
-#define FORMAT_BYTES_MAX 16
+#define FORMAT_BYTES_MAX 16U
+
 char *format_bytes_full(char *buf, size_t l, uint64_t t, FormatBytesFlag flag);
+
 static inline char *format_bytes(char *buf, size_t l, uint64_t t) {
         return format_bytes_full(buf, l, t, FORMAT_BYTES_USE_IEC | FORMAT_BYTES_BELOW_POINT | FORMAT_BYTES_TRAILING_B);
 }
+
 static inline char *format_bytes_cgroup_protection(char *buf, size_t l, uint64_t t) {
         if (t == CGROUP_LIMIT_MAX) {
                 (void) snprintf(buf, l, "%s", "infinity");

src/basic/time-util.h

@@ -63,10 +63,10 @@ typedef enum TimestampStyle {
 
 /* We assume a maximum timezone length of 6. TZNAME_MAX is not defined on Linux, but glibc internally initializes this
  * to 6. Let's rely on that. */
-#define FORMAT_TIMESTAMP_MAX (3+1+10+1+8+1+6+1+6+1)
-#define FORMAT_TIMESTAMP_WIDTH 28 /* when outputting, assume this width */
-#define FORMAT_TIMESTAMP_RELATIVE_MAX 256
-#define FORMAT_TIMESPAN_MAX 64
+#define FORMAT_TIMESTAMP_MAX (3U+1U+10U+1U+8U+1U+6U+1U+6U+1U)
+#define FORMAT_TIMESTAMP_WIDTH 28U /* when outputting, assume this width */
+#define FORMAT_TIMESTAMP_RELATIVE_MAX 256U
+#define FORMAT_TIMESPAN_MAX 64U
 
 #define TIME_T_MAX (time_t)((UINTMAX_C(1) << ((sizeof(time_t) << 3) - 1)) - 1)
 

src/boot/bootctl.c

@@ -1661,6 +1661,31 @@ static int verb_is_installed(int argc, char *argv[], void *userdata) {
         return EXIT_SUCCESS;
 }
 
+static int parse_loader_entry_target_arg(const char *arg1, char16_t **ret_target, size_t *ret_target_size) {
+        int r;
+        if (streq(arg1, "@current")) {
+                r = efi_get_variable(EFI_VENDOR_LOADER, "LoaderEntrySelected", NULL, (void *) ret_target, ret_target_size);
+                if (r < 0)
+                        return log_error_errno(r, "Failed to get EFI variable 'LoaderEntrySelected': %m");
+        } else if (streq(arg1, "@oneshot")) {
+                r = efi_get_variable(EFI_VENDOR_LOADER, "LoaderEntryOneShot", NULL, (void *) ret_target, ret_target_size);
+                if (r < 0)
+                        return log_error_errno(r, "Failed to get EFI variable 'LoaderEntryOneShot': %m");
+        } else if (streq(arg1, "@default")) {
+                r = efi_get_variable(EFI_VENDOR_LOADER, "LoaderEntryDefault", NULL, (void *) ret_target, ret_target_size);
+                if (r < 0)
+                        return log_error_errno(r, "Failed to get EFI variable 'LoaderEntryDefault': %m");
+        } else {
+                char16_t *encoded = NULL;
+                encoded = utf8_to_utf16(arg1, strlen(arg1));
+                if (!encoded)
+                        return log_oom();
+                *ret_target = encoded;
+                *ret_target_size = char16_strlen(encoded) * 2 + 2;
+        }
+        return 0;
+}
+
 static int verb_set_default(int argc, char *argv[], void *userdata) {
         const char *name;
         int r;
@@ -1693,17 +1718,17 @@ static int verb_set_default(int argc, char *argv[], void *userdata) {
         if (isempty(argv[1])) {
                 r = efi_set_variable(EFI_VENDOR_LOADER, name, NULL, 0);
                 if (r < 0 && r != -ENOENT)
-                        return log_error_errno(r, "Failed to remove EFI variale: %m");
+                        return log_error_errno(r, "Failed to remove EFI variable '%s': %m", name);
         } else {
-                _cleanup_free_ char16_t *encoded = NULL;
+                _cleanup_free_ char16_t *target = NULL;
+                size_t target_size = 0;
 
-                encoded = utf8_to_utf16(argv[1], strlen(argv[1]));
-                if (!encoded)
-                        return log_oom();
-
-                r = efi_set_variable(EFI_VENDOR_LOADER, name, encoded, char16_strlen(encoded) * 2 + 2);
+                r = parse_loader_entry_target_arg(argv[1], &target, &target_size);
                 if (r < 0)
-                        return log_error_errno(r, "Failed to update EFI variable: %m");
+                        return r;
+                r = efi_set_variable(EFI_VENDOR_LOADER, name, target, target_size);
+                if (r < 0)
+                        return log_error_errno(r, "Failed to update EFI variable '%s': %m", name);
         }
 
         return 0;

src/cgtop/cgtop.c

@@ -586,7 +586,7 @@ static void display(Hashmap *a) {
         Group **array;
         signed path_columns;
         unsigned rows, n = 0, j, maxtcpu = 0, maxtpath = 3; /* 3 for ellipsize() to work properly */
-        char buffer[MAX3(21, FORMAT_BYTES_MAX, FORMAT_TIMESPAN_MAX)];
+        char buffer[MAX3(21U, FORMAT_BYTES_MAX, FORMAT_TIMESPAN_MAX)];
 
         assert(a);
 

src/shared/logs-show.c

@@ -347,7 +347,7 @@ static int output_timestamp_monotonic(FILE *f, sd_journal *j, const char *monoto
 }
 
 static int output_timestamp_realtime(FILE *f, sd_journal *j, OutputMode mode, OutputFlags flags, const char *realtime) {
-        char buf[MAX(FORMAT_TIMESTAMP_MAX, 64)];
+        char buf[MAX(FORMAT_TIMESTAMP_MAX, 64U)];
         struct tm *(*gettime_r)(const time_t *, struct tm *);
         struct tm tm;
         uint64_t x;

src/udev/udevadm-util.c

@@ -3,11 +3,73 @@
 #include <errno.h>
 
 #include "alloc-util.h"
+#include "bus-error.h"
+#include "bus-util.h"
 #include "device-private.h"
 #include "path-util.h"
 #include "udevadm-util.h"
 #include "unit-name.h"
 
+static int find_device_from_path(const char *path, sd_device **ret) {
+        if (path_startswith(path, "/sys/"))
+                return sd_device_new_from_syspath(ret, path);
+
+        if (path_startswith(path, "/dev/")) {
+                struct stat st;
+
+                if (stat(path, &st) < 0)
+                        return -errno;
+
+                return device_new_from_stat_rdev(ret, &st);
+        }
+
+        return -EINVAL;
+}
+
+static int find_device_from_unit(const char *unit_name, sd_device **ret) {
+        _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
+        _cleanup_(sd_bus_flush_close_unrefp) sd_bus *bus = NULL;
+        _cleanup_free_ char *unit_path = NULL, *syspath = NULL;
+        int r;
+
+        if (!unit_name_is_valid(unit_name, UNIT_NAME_PLAIN))
+                return -EINVAL;
+
+        if (unit_name_to_type(unit_name) != UNIT_DEVICE)
+                return -EINVAL;
+
+        r = bus_connect_system_systemd(&bus);
+        if (r < 0) {
+                _cleanup_free_ char *path = NULL;
+
+                log_debug_errno(r, "Failed to open connection to systemd, using unit name as syspath: %m");
+
+                r = unit_name_to_path(unit_name, &path);
+                if (r < 0)
+                        return log_debug_errno(r, "Failed to convert \"%s\" to a device path: %m", unit_name);
+
+                return find_device_from_path(path, ret);
+        }
+
+        unit_path = unit_dbus_path_from_name(unit_name);
+        if (!unit_path)
+                return -ENOMEM;
+
+        r = sd_bus_get_property_string(
+                        bus,
+                        "org.freedesktop.systemd1",
+                        unit_path,
+                        "org.freedesktop.systemd1.Device",
+                        "SysFSPath",
+                        &error,
+                        &syspath);
+        if (r < 0)
+                return log_debug_errno(r, "Failed to get SysFSPath= dbus property for %s: %s",
+                                       unit_name, bus_error_message(&error, r));
+
+        return sd_device_new_from_syspath(ret, syspath);
+}
+
 int find_device(const char *id, const char *prefix, sd_device **ret) {
         _cleanup_free_ char *path = NULL;
         int r;
@@ -24,26 +86,10 @@ int find_device(const char *id, const char *prefix, sd_device **ret) {
         } else {
                 /* In cases where the argument is generic (no prefix specified),
                  * check if the argument looks like a device unit name. */
-                if (unit_name_is_valid(id, UNIT_NAME_PLAIN) &&
-                    unit_name_to_type(id) == UNIT_DEVICE) {
-                        r = unit_name_to_path(id, &path);
-                        if (r < 0)
-                                return log_debug_errno(r, "Failed to convert \"%s\" to a device path: %m", id);
-                        id = path;
-                }
+                r = find_device_from_unit(id, ret);
+                if (r >= 0)
+                        return r;
         }
 
-        if (path_startswith(id, "/sys/"))
-                return sd_device_new_from_syspath(ret, id);
-
-        if (path_startswith(id, "/dev/")) {
-                struct stat st;
-
-                if (stat(id, &st) < 0)
-                        return -errno;
-
-                return device_new_from_stat_rdev(ret, &st);
-        }
-
-        return -EINVAL;
+        return find_device_from_path(id, ret);
 }