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core: add possibility to not track certain unit types
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@ -274,6 +274,15 @@ All tools:
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it is either set to `system` or `user` depending on whether the NSS/PAM
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module is called by systemd in `--system` or `--user` mode.
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* `$SYSTEMD_SUPPORT_DEVICE`, `$SYSTEMD_SUPPORT_MOUNT`, `$SYSTEMD_SUPPORT_SWAP` -
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can be set to `0` to mark respective unit type as unsupported. Generally,
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having less units saves system resources so these options might be useful
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for cases where we don't need to track given unit type, e.g. `--user` manager
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often doesn't need to deal with device or swap units because they are
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handled by the `--system` manager (PID 1). Note that setting certain unit
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type as unsupported may not prevent loading some units of that type if they
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are referenced by other units of another supported type.
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`systemd-remount-fs`:
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* `$SYSTEMD_REMOUNT_ROOT_RW=1` — if set and no entry for the root directory
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@ -22,6 +22,7 @@
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#include "dbus-unit.h"
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#include "dbus.h"
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#include "dropin.h"
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#include "env-util.h"
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#include "escape.h"
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#include "execute.h"
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#include "fd-util.h"
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@ -4781,11 +4782,28 @@ int unit_setup_dynamic_creds(Unit *u) {
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}
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bool unit_type_supported(UnitType t) {
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static int8_t cache[_UNIT_TYPE_MAX] = {}; /* -1: disabled, 1: enabled: 0: don't know */
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int r;
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if (_unlikely_(t < 0))
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return false;
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if (_unlikely_(t >= _UNIT_TYPE_MAX))
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return false;
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if (cache[t] == 0) {
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char *e;
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e = strjoina("SYSTEMD_SUPPORT_", unit_type_to_string(t));
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r = getenv_bool(ascii_strupper(e));
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if (r < 0 && r != -ENXIO)
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log_debug_errno(r, "Failed to parse $%s, ignoring: %m", e);
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cache[t] = r == 0 ? -1 : 1;
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}
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if (cache[t] < 0)
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return false;
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if (!unit_vtable[t]->supported)
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return true;
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