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Add support for conditions on the machines firmware

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This allows to limit units to machines that run on a certain firmware
type. For device tree defined machines checking against the machine's
compatible is also possible.
This commit is contained in:
Uwe Kleine-König 2020-10-09 12:13:00 +02:00 committed by Lennart Poettering
parent 192a9d95ea
commit cbcdcaaa0e
12 changed files with 120 additions and 0 deletions
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1
docs/TRANSIENT-SETTINGS.md
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@ -68,6 +68,7 @@ Most generic unit settings are available for transient units.
✓ ConditionKernelCommandLine=
✓ ConditionKernelVersion=
✓ ConditionArchitecture=
✓ ConditionFirmware=
✓ ConditionVirtualization=
✓ ConditionSecurity=
✓ ConditionCapability=

12
man/systemd.link.xml
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@ -222,6 +222,18 @@
</para>
</listitem>
</varlistentry>
<varlistentry id='firmware'>
<term><varname>Firmware=</varname></term>
<listitem>
<para>Checks whether the system is running on a machine with the specified firmware. See
<varname>ConditionFirmware=</varname> in
<citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry>
for details. When prefixed with an exclamation mark (<literal>!</literal>), the result is negated.
If an empty string is assigned, then previously assigned value is cleared.
</para>
</listitem>
</varlistentry>
</variablelist>
</refsect1>

11
man/systemd.netdev.xml
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@ -258,6 +258,17 @@
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><varname>Firmware=</varname></term>
<listitem>
<para>Checks whether the system is running on a machine with the specified firmware. See
<literal>ConditionFirmware=</literal> in
<citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry>
for details. When prefixed with an exclamation mark (<literal>!</literal>), the result is negated.
If an empty string is assigned, then previously assigned value is cleared.
</para>
</listitem>
</varlistentry>
</variablelist>
</refsect1>

10
man/systemd.unit.xml
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@ -1172,6 +1172,16 @@
</listitem>
</varlistentry>
<varlistentry>
<term><varname>ConditionFirmware=</varname></term>
<listitem><para>Check whether the system's firmware is of a certain type. Possible values are:
<literal>uefi</literal> (for systems with EFI),
<literal>device-tree</literal> (for systems with a device tree) and
<literal>device-tree-compatible(xyz)</literal> (for systems with a device tree that is compatible to <literal>xyz</literal>).</para>
</listitem>
</varlistentry>
<varlistentry>
<term><varname>ConditionVirtualization=</varname></term>

1
src/core/load-fragment-gperf.gperf.m4
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@ -297,6 +297,7 @@ Unit.ConditionFileIsExecutable, config_parse_unit_condition_path,
Unit.ConditionNeedsUpdate, config_parse_unit_condition_path, CONDITION_NEEDS_UPDATE, offsetof(Unit, conditions)
Unit.ConditionFirstBoot, config_parse_unit_condition_string, CONDITION_FIRST_BOOT, offsetof(Unit, conditions)
Unit.ConditionArchitecture, config_parse_unit_condition_string, CONDITION_ARCHITECTURE, offsetof(Unit, conditions)
Unit.ConditionFirmware, config_parse_unit_condition_string, CONDITION_FIRMWARE, offsetof(Unit, conditions)
Unit.ConditionVirtualization, config_parse_unit_condition_string, CONDITION_VIRTUALIZATION, offsetof(Unit, conditions)
Unit.ConditionHost, config_parse_unit_condition_string, CONDITION_HOST, offsetof(Unit, conditions)
Unit.ConditionKernelCommandLine, config_parse_unit_condition_string, CONDITION_KERNEL_COMMAND_LINE, offsetof(Unit, conditions)

1
src/network/netdev/netdev-gperf.gperf
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@ -44,6 +44,7 @@ Match.Virtualization, config_parse_net_condition,
Match.KernelCommandLine, config_parse_net_condition, CONDITION_KERNEL_COMMAND_LINE, offsetof(NetDev, conditions)
Match.KernelVersion, config_parse_net_condition, CONDITION_KERNEL_VERSION, offsetof(NetDev, conditions)
Match.Architecture, config_parse_net_condition, CONDITION_ARCHITECTURE, offsetof(NetDev, conditions)
Match.Firmware, config_parse_net_condition, CONDITION_FIRMWARE, offsetof(NetDev, conditions)
NetDev.Description, config_parse_string, 0, offsetof(NetDev, description)
NetDev.Name, config_parse_ifname, 0, offsetof(NetDev, ifname)
NetDev.Kind, config_parse_netdev_kind, 0, offsetof(NetDev, kind)

1
src/network/networkd-network-gperf.gperf
View File

@ -56,6 +56,7 @@ Match.Virtualization, config_parse_net_condition,
Match.KernelCommandLine, config_parse_net_condition, CONDITION_KERNEL_COMMAND_LINE, offsetof(Network, conditions)
Match.KernelVersion, config_parse_net_condition, CONDITION_KERNEL_VERSION, offsetof(Network, conditions)
Match.Architecture, config_parse_net_condition, CONDITION_ARCHITECTURE, offsetof(Network, conditions)
Match.Firmware, config_parse_net_condition, CONDITION_FIRMWARE, offsetof(Network, conditions)
Link.MACAddress, config_parse_hwaddr, 0, offsetof(Network, mac)
Link.MTUBytes, config_parse_mtu, AF_UNSPEC, offsetof(Network, mtu)
Link.Group, config_parse_uint32, 0, offsetof(Network, group)

79
src/shared/condition.c
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@ -5,6 +5,7 @@
#include <fnmatch.h>
#include <limits.h>
#include <stdlib.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/utsname.h>
#include <time.h>
@ -450,6 +451,81 @@ static int condition_test_architecture(Condition *c, char **env) {
return a == b;
}
#define DTCOMPAT_FILE "/sys/firmware/devicetree/base/compatible"
static int condition_test_firmware_devicetree_compatible(const char *dtcarg) {
int r;
_cleanup_free_ char *dtcompat = NULL;
_cleanup_strv_free_ char **dtcompatlist = NULL;
size_t size;
r = read_full_virtual_file(DTCOMPAT_FILE, &dtcompat, &size);
if (r < 0) {
/* if the path doesn't exist it is incompatible */
if (r != -ENOENT)
log_debug_errno(r, "Failed to open() '%s', assuming machine is incompatible: %m", DTCOMPAT_FILE);
return false;
}
/* Not sure this can happen, but play safe. */
if (size == 0) {
log_debug("%s has zero length, assuming machine is incompatible", DTCOMPAT_FILE);
return false;
}
/*
* /sys/firmware/devicetree/base/compatible consists of one or more
* strings, each ending in '\0'. So the last character in dtcompat must
* be a '\0'.
*/
if (dtcompat[size - 1] != '\0') {
log_debug("%s is in an unknown format, assuming machine is incompatible", DTCOMPAT_FILE);
return false;
}
dtcompatlist = strv_parse_nulstr(dtcompat, size);
if (!dtcompatlist)
return -ENOMEM;
return strv_contains(dtcompatlist, dtcarg);
}
static int condition_test_firmware(Condition *c, char **env) {
sd_char *dtc;
assert(c);
assert(c->parameter);
assert(c->type == CONDITION_FIRMWARE);
if (streq(c->parameter, "device-tree")) {
if (access("/sys/firmware/device-tree/", F_OK) < 0) {
if (errno != ENOENT)
log_debug_errno(errno, "Unexpected error when checking for /sys/firmware/device-tree/: %m");
return false;
} else
return true;
} else if ((dtc = startswith(c->parameter, "device-tree-compatible("))) {
_cleanup_free_ char *dtcarg = NULL;
char *end;
end = strchr(dtc, ')');
if (!end || *(end + 1) != '\0') {
log_debug("Malformed Firmware condition \"%s\"", c->parameter);
return false;
}
dtcarg = strndup(dtc, end - dtc);
if (!dtcarg)
return -ENOMEM;
return condition_test_firmware_devicetree_compatible(dtcarg);
} else if (streq(c->parameter, "uefi"))
return is_efi_boot();
else {
log_debug("Unsupported Firmware condition \"%s\"", c->parameter);
return false;
}
}
static int condition_test_host(Condition *c, char **env) {
_cleanup_free_ char *h = NULL;
sd_id128_t x, y;
@ -843,6 +919,7 @@ int condition_test(Condition *c, char **env) {
[CONDITION_HOST] = condition_test_host,
[CONDITION_AC_POWER] = condition_test_ac_power,
[CONDITION_ARCHITECTURE] = condition_test_architecture,
[CONDITION_FIRMWARE] = condition_test_firmware,
[CONDITION_NEEDS_UPDATE] = condition_test_needs_update,
[CONDITION_FIRST_BOOT] = condition_test_first_boot,
[CONDITION_USER] = condition_test_user,
@ -949,6 +1026,7 @@ void condition_dump_list(Condition *first, FILE *f, const char *prefix, conditio
static const char* const condition_type_table[_CONDITION_TYPE_MAX] = {
[CONDITION_ARCHITECTURE] = "ConditionArchitecture",
[CONDITION_FIRMWARE] = "ConditionFirmware",
[CONDITION_VIRTUALIZATION] = "ConditionVirtualization",
[CONDITION_HOST] = "ConditionHost",
[CONDITION_KERNEL_COMMAND_LINE] = "ConditionKernelCommandLine",
@ -981,6 +1059,7 @@ DEFINE_STRING_TABLE_LOOKUP(condition_type, ConditionType);
static const char* const assert_type_table[_CONDITION_TYPE_MAX] = {
[CONDITION_ARCHITECTURE] = "AssertArchitecture",
[CONDITION_FIRMWARE] = "AssertFirmware",
[CONDITION_VIRTUALIZATION] = "AssertVirtualization",
[CONDITION_HOST] = "AssertHost",
[CONDITION_KERNEL_COMMAND_LINE] = "AssertKernelCommandLine",

1
src/shared/condition.h
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@ -9,6 +9,7 @@
typedef enum ConditionType {
CONDITION_ARCHITECTURE,
CONDITION_FIRMWARE,
CONDITION_VIRTUALIZATION,
CONDITION_HOST,
CONDITION_KERNEL_COMMAND_LINE,

1
test/fuzz/fuzz-netdev-parser/directives.netdev
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@ -22,6 +22,7 @@ Mode=
SourceMACAddress=
[Match]
Architecture=
Firmware=
Host=
KernelVersion=
Virtualization=

1
test/fuzz/fuzz-network-parser/directives.network
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@ -18,6 +18,7 @@ KernelVersion=
Type=
Driver=
Architecture=
Firmware=
Path=
WLANInterfaceType=
SSID=

1
test/fuzz/fuzz-unit-file/directives.service
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@ -36,6 +36,7 @@ CollectMode=
ConditionACPower=
ConditionArchitecture=
ConditionCPUs=
ConditionFirmware=
ConditionCapability=
ConditionControlGroupController=
ConditionDirectoryNotEmpty=