nspawn: add new .nspawn files for container settings

.nspawn fiels are simple settings files that may accompany container
images and directories and contain settings otherwise passed on the
nspawn command line. This provides an efficient way to attach execution
data directly to containers.

2 files changed, 97 insertions, 2 deletions

diff --git a/src/shared/conf-parser.c b/src/shared/conf-parser.c
index 1f4aea6d6b..36150d8744 100644
--- a/src/shared/conf-parser.c
+++ b/src/shared/conf-parser.c
@@ -24,7 +24,7 @@
 #include <errno.h>
 #include <stdlib.h>
 
-#include "conf-parser.h"
+#include "sd-messages.h"
 #include "conf-files.h"
 #include "util.h"
 #include "macro.h"
@@ -32,7 +32,8 @@
 #include "log.h"
 #include "utf8.h"
 #include "path-util.h"
-#include "sd-messages.h"
+#include "signal-util.h"
+#include "conf-parser.h"
 
 int config_item_table_lookup(
                 const void *table,
@@ -575,6 +576,39 @@ int config_parse_bool(const char* unit,
         return 0;
 }
 
+int config_parse_tristate(
+                const char* unit,
+                const char *filename,
+                unsigned line,
+                const char *section,
+                unsigned section_line,
+                const char *lvalue,
+                int ltype,
+                const char *rvalue,
+                void *data,
+                void *userdata) {
+
+        int k, *t = data;
+
+        assert(filename);
+        assert(lvalue);
+        assert(rvalue);
+        assert(data);
+
+        /* A tristate is pretty much a boolean, except that it can
+         * also take the special value -1, indicating "uninitialized",
+         * much like NULL is for a pointer type. */
+
+        k = parse_boolean(rvalue);
+        if (k < 0) {
+                log_syntax(unit, LOG_ERR, filename, line, k, "Failed to parse boolean value, ignoring: %s", rvalue);
+                return 0;
+        }
+
+        *t = !!k;
+        return 0;
+}
+
 int config_parse_string(
                 const char *unit,
                 const char *filename,
@@ -802,3 +836,61 @@ int config_parse_log_level(
         *o = (*o & LOG_FACMASK) | x;
         return 0;
 }
+
+int config_parse_signal(
+                const char *unit,
+                const char *filename,
+                unsigned line,
+                const char *section,
+                unsigned section_line,
+                const char *lvalue,
+                int ltype,
+                const char *rvalue,
+                void *data,
+                void *userdata) {
+
+        int *sig = data, r;
+
+        assert(filename);
+        assert(lvalue);
+        assert(rvalue);
+        assert(sig);
+
+        r = signal_from_string_try_harder(rvalue);
+        if (r <= 0) {
+                log_syntax(unit, LOG_ERR, filename, line, EINVAL, "Failed to parse signal name, ignoring: %s", rvalue);
+                return 0;
+        }
+
+        *sig = r;
+        return 0;
+}
+
+int config_parse_personality(
+                const char *unit,
+                const char *filename,
+                unsigned line,
+                const char *section,
+                unsigned section_line,
+                const char *lvalue,
+                int ltype,
+                const char *rvalue,
+                void *data,
+                void *userdata) {
+
+        unsigned long *personality = data, p;
+
+        assert(filename);
+        assert(lvalue);
+        assert(rvalue);
+        assert(personality);
+
+        p = personality_from_string(rvalue);
+        if (p == PERSONALITY_INVALID) {
+                log_syntax(unit, LOG_ERR, filename, line, EINVAL, "Failed to parse personality, ignoring: %s", rvalue);
+                return 0;
+        }
+
+        *personality = p;
+        return 0;
+}
diff --git a/src/shared/conf-parser.h b/src/shared/conf-parser.h
index 66c80890d3..34e3815782 100644
--- a/src/shared/conf-parser.h
+++ b/src/shared/conf-parser.h
@@ -111,6 +111,7 @@ int config_parse_iec_size(const char *unit, const char *filename, unsigned line,
 int config_parse_si_size(const char *unit, const char *filename, unsigned line, const char *section, unsigned section_line, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata);
 int config_parse_iec_off(const char *unit, const char *filename, unsigned line, const char *section, unsigned section_line, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata);
 int config_parse_bool(const char *unit, const char *filename, unsigned line, const char *section, unsigned section_line, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata);
+int config_parse_tristate(const char *unit, const char *filename, unsigned line, const char *section, unsigned section_line, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata);
 int config_parse_string(const char *unit, const char *filename, unsigned line, const char *section, unsigned section_line, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata);
 int config_parse_path(const char *unit, const char *filename, unsigned line, const char *section, unsigned section_line, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata);
 int config_parse_strv(const char *unit, const char *filename, unsigned line, const char *section, unsigned section_line, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata);
@@ -119,6 +120,8 @@ int config_parse_nsec(const char *unit, const char *filename, unsigned line, con
 int config_parse_mode(const char *unit, const char *filename, unsigned line, const char *section, unsigned section_line, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata);
 int config_parse_log_facility(const char *unit, const char *filename, unsigned line, const char *section, unsigned section_line, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata);
 int config_parse_log_level(const char *unit, const char *filename, unsigned line, const char *section, unsigned section_line, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata);
+int config_parse_signal(const char *unit, const char *filename, unsigned line, const char *section, unsigned section_line, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata);
+int config_parse_personality(const char *unit, const char *filename, unsigned line, const char *section, unsigned section_line, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata);
 
 #define log_invalid_utf8(unit, level, config_file, config_line, error, rvalue) \
         do {                                                            \