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-rw-r--r--src/grp-system/libcore/src/unit-printf.c305
1 files changed, 305 insertions, 0 deletions
diff --git a/src/grp-system/libcore/src/unit-printf.c b/src/grp-system/libcore/src/unit-printf.c
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+++ b/src/grp-system/libcore/src/unit-printf.c
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+/***
+ This file is part of systemd.
+
+ Copyright 2010 Lennart Poettering
+
+ systemd is free software; you can redistribute it and/or modify it
+ under the terms of the GNU Lesser General Public License as published by
+ the Free Software Foundation; either version 2.1 of the License, or
+ (at your option) any later version.
+
+ systemd is distributed in the hope that it will be useful, but
+ WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public License
+ along with systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+#include "core/unit.h"
+#include "systemd-basic/alloc-util.h"
+#include "systemd-basic/cgroup-util.h"
+#include "systemd-basic/formats-util.h"
+#include "systemd-basic/macro.h"
+#include "systemd-basic/string-util.h"
+#include "systemd-basic/strv.h"
+#include "systemd-basic/unit-name.h"
+#include "systemd-basic/user-util.h"
+#include "systemd-shared/specifier.h"
+
+#include "unit-printf.h"
+
+static int specifier_prefix_and_instance(char specifier, void *data, void *userdata, char **ret) {
+ Unit *u = userdata;
+
+ assert(u);
+
+ return unit_name_to_prefix_and_instance(u->id, ret);
+}
+
+static int specifier_prefix(char specifier, void *data, void *userdata, char **ret) {
+ Unit *u = userdata;
+
+ assert(u);
+
+ return unit_name_to_prefix(u->id, ret);
+}
+
+static int specifier_prefix_unescaped(char specifier, void *data, void *userdata, char **ret) {
+ _cleanup_free_ char *p = NULL;
+ Unit *u = userdata;
+ int r;
+
+ assert(u);
+
+ r = unit_name_to_prefix(u->id, &p);
+ if (r < 0)
+ return r;
+
+ return unit_name_unescape(p, ret);
+}
+
+static int specifier_instance_unescaped(char specifier, void *data, void *userdata, char **ret) {
+ Unit *u = userdata;
+
+ assert(u);
+
+ return unit_name_unescape(strempty(u->instance), ret);
+}
+
+static int specifier_filename(char specifier, void *data, void *userdata, char **ret) {
+ Unit *u = userdata;
+
+ assert(u);
+
+ if (u->instance)
+ return unit_name_path_unescape(u->instance, ret);
+ else
+ return unit_name_to_path(u->id, ret);
+}
+
+static int specifier_cgroup(char specifier, void *data, void *userdata, char **ret) {
+ Unit *u = userdata;
+ char *n;
+
+ assert(u);
+
+ if (u->cgroup_path)
+ n = strdup(u->cgroup_path);
+ else
+ n = unit_default_cgroup_path(u);
+ if (!n)
+ return -ENOMEM;
+
+ *ret = n;
+ return 0;
+}
+
+static int specifier_cgroup_root(char specifier, void *data, void *userdata, char **ret) {
+ Unit *u = userdata;
+ char *n;
+
+ assert(u);
+
+ n = strdup(u->manager->cgroup_root);
+ if (!n)
+ return -ENOMEM;
+
+ *ret = n;
+ return 0;
+}
+
+static int specifier_cgroup_slice(char specifier, void *data, void *userdata, char **ret) {
+ Unit *u = userdata;
+ char *n;
+
+ assert(u);
+
+ if (UNIT_ISSET(u->slice)) {
+ Unit *slice;
+
+ slice = UNIT_DEREF(u->slice);
+
+ if (slice->cgroup_path)
+ n = strdup(slice->cgroup_path);
+ else
+ n = unit_default_cgroup_path(slice);
+ } else
+ n = strdup(u->manager->cgroup_root);
+ if (!n)
+ return -ENOMEM;
+
+ *ret = n;
+ return 0;
+}
+
+static int specifier_runtime(char specifier, void *data, void *userdata, char **ret) {
+ Unit *u = userdata;
+ const char *e;
+ char *n = NULL;
+
+ assert(u);
+
+ e = manager_get_runtime_prefix(u->manager);
+ if (!e)
+ return -EOPNOTSUPP;
+ n = strdup(e);
+ if (!n)
+ return -ENOMEM;
+
+ *ret = n;
+ return 0;
+}
+
+static int specifier_user_name(char specifier, void *data, void *userdata, char **ret) {
+ char *t;
+
+ /* If we are UID 0 (root), this will not result in NSS,
+ * otherwise it might. This is good, as we want to be able to
+ * run this in PID 1, where our user ID is 0, but where NSS
+ * lookups are not allowed. */
+
+ t = getusername_malloc();
+ if (!t)
+ return -ENOMEM;
+
+ *ret = t;
+ return 0;
+}
+
+static int specifier_user_id(char specifier, void *data, void *userdata, char **ret) {
+
+ if (asprintf(ret, UID_FMT, getuid()) < 0)
+ return -ENOMEM;
+
+ return 0;
+}
+
+static int specifier_user_home(char specifier, void *data, void *userdata, char **ret) {
+
+ /* On PID 1 (which runs as root) this will not result in NSS,
+ * which is good. See above */
+
+ return get_home_dir(ret);
+}
+
+static int specifier_user_shell(char specifier, void *data, void *userdata, char **ret) {
+
+ /* On PID 1 (which runs as root) this will not result in NSS,
+ * which is good. See above */
+
+ return get_shell(ret);
+}
+
+int unit_name_printf(Unit *u, const char* format, char **ret) {
+
+ /*
+ * This will use the passed string as format string and
+ * replace the following specifiers:
+ *
+ * %n: the full id of the unit (foo@bar.waldo)
+ * %N: the id of the unit without the suffix (foo@bar)
+ * %p: the prefix (foo)
+ * %i: the instance (bar)
+ */
+
+ const Specifier table[] = {
+ { 'n', specifier_string, u->id },
+ { 'N', specifier_prefix_and_instance, NULL },
+ { 'p', specifier_prefix, NULL },
+ { 'i', specifier_string, u->instance },
+ { 0, NULL, NULL }
+ };
+
+ assert(u);
+ assert(format);
+ assert(ret);
+
+ return specifier_printf(format, table, u, ret);
+}
+
+int unit_full_printf(Unit *u, const char *format, char **ret) {
+
+ /* This is similar to unit_name_printf() but also supports
+ * unescaping. Also, adds a couple of additional codes:
+ *
+ * %f the instance if set, otherwise the id
+ * %c cgroup path of unit
+ * %r where units in this slice are placed in the cgroup tree
+ * %R the root of this systemd's instance tree
+ * %t the runtime directory to place sockets in (e.g. "/run" or $XDG_RUNTIME_DIR)
+ * %U the UID of the running user
+ * %u the username of the running user
+ * %h the homedir of the running user
+ * %s the shell of the running user
+ * %m the machine ID of the running system
+ * %H the host name of the running system
+ * %b the boot ID of the running system
+ * %v `uname -r` of the running system
+ */
+
+ const Specifier table[] = {
+ { 'n', specifier_string, u->id },
+ { 'N', specifier_prefix_and_instance, NULL },
+ { 'p', specifier_prefix, NULL },
+ { 'P', specifier_prefix_unescaped, NULL },
+ { 'i', specifier_string, u->instance },
+ { 'I', specifier_instance_unescaped, NULL },
+
+ { 'f', specifier_filename, NULL },
+ { 'c', specifier_cgroup, NULL },
+ { 'r', specifier_cgroup_slice, NULL },
+ { 'R', specifier_cgroup_root, NULL },
+ { 't', specifier_runtime, NULL },
+
+ { 'U', specifier_user_id, NULL },
+ { 'u', specifier_user_name, NULL },
+ { 'h', specifier_user_home, NULL },
+ { 's', specifier_user_shell, NULL },
+
+ { 'm', specifier_machine_id, NULL },
+ { 'H', specifier_host_name, NULL },
+ { 'b', specifier_boot_id, NULL },
+ { 'v', specifier_kernel_release, NULL },
+ {}
+ };
+
+ assert(u);
+ assert(format);
+ assert(ret);
+
+ return specifier_printf(format, table, u, ret);
+}
+
+int unit_full_printf_strv(Unit *u, char **l, char ***ret) {
+ size_t n;
+ char **r, **i, **j;
+ int q;
+
+ /* Applies unit_full_printf to every entry in l */
+
+ assert(u);
+
+ n = strv_length(l);
+ r = new(char*, n+1);
+ if (!r)
+ return -ENOMEM;
+
+ for (i = l, j = r; *i; i++, j++) {
+ q = unit_full_printf(u, *i, j);
+ if (q < 0)
+ goto fail;
+ }
+
+ *j = NULL;
+ *ret = r;
+ return 0;
+
+fail:
+ for (j--; j >= r; j--)
+ free(*j);
+
+ free(r);
+ return q;
+}
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