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-rw-r--r--src/core/unit-printf.c282
1 files changed, 282 insertions, 0 deletions
diff --git a/src/core/unit-printf.c b/src/core/unit-printf.c
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+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+/***
+ 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 "systemd/sd-id128.h"
+#include "unit.h"
+#include "specifier.h"
+#include "path-util.h"
+#include "strv.h"
+#include "unit-name.h"
+#include "unit-printf.h"
+
+static char *specifier_prefix_and_instance(char specifier, void *data, void *userdata) {
+ Unit *u = userdata;
+ assert(u);
+
+ return unit_name_to_prefix_and_instance(u->id);
+}
+
+static char *specifier_prefix(char specifier, void *data, void *userdata) {
+ Unit *u = userdata;
+ assert(u);
+
+ return unit_name_to_prefix(u->id);
+}
+
+static char *specifier_prefix_unescaped(char specifier, void *data, void *userdata) {
+ Unit *u = userdata;
+ char *p, *r;
+
+ assert(u);
+
+ p = unit_name_to_prefix(u->id);
+ if (!p)
+ return NULL;
+
+ r = unit_name_unescape(p);
+ free(p);
+
+ return r;
+}
+
+static char *specifier_instance_unescaped(char specifier, void *data, void *userdata) {
+ Unit *u = userdata;
+ assert(u);
+
+ if (u->instance)
+ return unit_name_unescape(u->instance);
+
+ return strdup("");
+}
+
+static char *specifier_filename(char specifier, void *data, void *userdata) {
+ Unit *u = userdata;
+ assert(u);
+
+ if (u->instance)
+ return unit_name_path_unescape(u->instance);
+
+ return unit_name_to_path(u->id);
+}
+
+static char *specifier_cgroup(char specifier, void *data, void *userdata) {
+ Unit *u = userdata;
+ assert(u);
+
+ return unit_default_cgroup_path(u);
+}
+
+static char *specifier_cgroup_root(char specifier, void *data, void *userdata) {
+ Unit *u = userdata;
+ char *p;
+ assert(u);
+
+ if (specifier == 'r')
+ return strdup(u->manager->cgroup_hierarchy);
+
+ if (path_get_parent(u->manager->cgroup_hierarchy, &p) < 0)
+ return strdup("");
+
+ if (streq(p, "/")) {
+ free(p);
+ return strdup("");
+ }
+
+ return p;
+}
+
+static char *specifier_runtime(char specifier, void *data, void *userdata) {
+ Unit *u = userdata;
+ assert(u);
+
+ if (u->manager->running_as == MANAGER_USER) {
+ const char *e;
+
+ e = getenv("XDG_RUNTIME_DIR");
+ if (e)
+ return strdup(e);
+ }
+
+ return strdup("/run");
+}
+
+static char *specifier_user_name(char specifier, void *data, void *userdata) {
+ Service *s = userdata;
+ int r;
+ const char *username;
+
+ /* get USER env from our own env if set */
+ if (!s->exec_context.user)
+ return getusername_malloc();
+
+ /* fish username from passwd */
+ username = s->exec_context.user;
+ r = get_user_creds(&username, NULL, NULL, NULL, NULL);
+ if (r < 0)
+ return NULL;
+
+ return strdup(username);
+}
+
+static char *specifier_user_home(char specifier, void *data, void *userdata) {
+ Service *s = userdata;
+ int r;
+ const char *username, *home;
+
+ /* return HOME if set, otherwise from passwd */
+ if (!s->exec_context.user) {
+ char *h;
+
+ r = get_home_dir(&h);
+ if (r < 0)
+ return NULL;
+
+ return h;
+ }
+
+ username = s->exec_context.user;
+ r = get_user_creds(&username, NULL, NULL, &home, NULL);
+ if (r < 0)
+ return NULL;
+
+ return strdup(home);
+}
+
+static char *specifier_user_shell(char specifier, void *data, void *userdata) {
+ Service *s = userdata;
+ int r;
+ const char *username, *shell;
+
+ /* return HOME if set, otherwise from passwd */
+ if (!s->exec_context.user) {
+ char *sh;
+
+ r = get_shell(&sh);
+ if (r < 0)
+ return strdup("/bin/sh");
+
+ return sh;
+ }
+
+ username = s->exec_context.user;
+ r = get_user_creds(&username, NULL, NULL, NULL, &shell);
+ if (r < 0)
+ return strdup("/bin/sh");
+
+ return strdup(shell);
+}
+
+char *unit_name_printf(Unit *u, const char* format) {
+
+ /*
+ * 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);
+
+ return specifier_printf(format, table, u);
+}
+
+char *unit_full_printf(Unit *u, const char *format) {
+
+ /* This is similar to unit_name_printf() but also supports
+ * unescaping. Also, adds a couple of additional codes:
+ *
+ * %f the the instance if set, otherwise the id
+ * %c cgroup path of unit
+ * %r root cgroup path of this systemd instance (e.g. "/user/lennart/shared/systemd-4711")
+ * %R parent of root cgroup path (e.g. "/usr/lennart/shared")
+ * %t the runtime directory to place sockets in (e.g. "/run" or $XDG_RUNTIME_DIR)
+ * %u the username of the configured user or running user
+ * %h the homedir of the configured user or running user
+ * %s the shell of the configured user or running user
+ */
+
+ 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_root, NULL },
+ { 'R', specifier_cgroup_root, NULL },
+ { 't', specifier_runtime, NULL },
+ { 'u', specifier_user_name, NULL },
+ { 'h', specifier_user_home, NULL },
+ { 's', specifier_user_shell, NULL },
+ { 0, NULL, NULL }
+ };
+
+ assert(u);
+ assert(format);
+
+ return specifier_printf(format, table, u);
+}
+
+char **unit_full_printf_strv(Unit *u, char **l) {
+ size_t n;
+ char **r, **i, **j;
+
+ /* Applies unit_full_printf to every entry in l */
+
+ assert(u);
+
+ n = strv_length(l);
+ r = new(char*, n+1);
+ if (!r)
+ return NULL;
+
+ for (i = l, j = r; *i; i++, j++) {
+ *j = unit_full_printf(u, *i);
+ if (!*j)
+ goto fail;
+ }
+
+ *j = NULL;
+ return r;
+
+fail:
+ for (j--; j >= r; j--)
+ free(*j);
+
+ free(r);
+
+ return NULL;
+}
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