diff options
Diffstat (limited to 'src/libsystemd-shared/src/install-printf.c')
| -rw-r--r-- | src/libsystemd-shared/src/install-printf.c | 172 |
1 files changed, 172 insertions, 0 deletions
diff --git a/src/libsystemd-shared/src/install-printf.c b/src/libsystemd-shared/src/install-printf.c new file mode 100644 index 0000000000..cbb92dc803 --- /dev/null +++ b/src/libsystemd-shared/src/install-printf.c @@ -0,0 +1,172 @@ +/*** + This file is part of systemd. + + Copyright 2013 Zbigniew Jędrzejewski-Szmek + + 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 <errno.h> +#include <stdio.h> +#include <string.h> +#include <unistd.h> + +#include "systemd-basic/formats-util.h" +#include "systemd-basic/macro.h" +#include "systemd-basic/string-util.h" +#include "systemd-basic/unit-name.h" +#include "systemd-basic/user-util.h" +#include "systemd-shared/install-printf.h" +#include "systemd-shared/install.h" +#include "systemd-shared/specifier.h" + +static int specifier_prefix_and_instance(char specifier, void *data, void *userdata, char **ret) { + const UnitFileInstallInfo *i = userdata; + _cleanup_free_ char *prefix = NULL; + int r; + + assert(i); + + r = unit_name_to_prefix_and_instance(i->name, &prefix); + if (r < 0) + return r; + + if (endswith(prefix, "@") && i->default_instance) { + char *ans; + + ans = strjoin(prefix, i->default_instance, NULL); + if (!ans) + return -ENOMEM; + *ret = ans; + } else { + *ret = prefix; + prefix = NULL; + } + + return 0; +} + +static int specifier_name(char specifier, void *data, void *userdata, char **ret) { + const UnitFileInstallInfo *i = userdata; + char *ans; + + assert(i); + + if (unit_name_is_valid(i->name, UNIT_NAME_TEMPLATE) && i->default_instance) + return unit_name_replace_instance(i->name, i->default_instance, ret); + + ans = strdup(i->name); + if (!ans) + return -ENOMEM; + *ret = ans; + return 0; +} + +static int specifier_prefix(char specifier, void *data, void *userdata, char **ret) { + const UnitFileInstallInfo *i = userdata; + + assert(i); + + return unit_name_to_prefix(i->name, ret); +} + +static int specifier_instance(char specifier, void *data, void *userdata, char **ret) { + const UnitFileInstallInfo *i = userdata; + char *instance; + int r; + + assert(i); + + r = unit_name_to_instance(i->name, &instance); + if (r < 0) + return r; + + if (isempty(instance)) { + instance = strdup(i->default_instance ?: ""); + if (!instance) + return -ENOMEM; + } + + *ret = instance; + 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. + + * We don't user getusername_malloc() here, because we don't want to look + * at $USER, to remain consistent with specifer_user_id() below. + */ + + t = uid_to_name(getuid()); + 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; +} + +int install_full_printf(UnitFileInstallInfo *i, const char *format, char **ret) { + + /* This is similar to unit_full_printf() but does not support + * anything path-related. + * + * %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) + + * %U the UID of the running user + * %u the username of 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_name, NULL }, + { 'N', specifier_prefix_and_instance, NULL }, + { 'p', specifier_prefix, NULL }, + { 'i', specifier_instance, NULL }, + + { 'U', specifier_user_id, NULL }, + { 'u', specifier_user_name, NULL }, + + { 'm', specifier_machine_id, NULL }, + { 'H', specifier_host_name, NULL }, + { 'b', specifier_boot_id, NULL }, + { 'v', specifier_kernel_release, NULL }, + {} + }; + + assert(i); + assert(format); + assert(ret); + + return specifier_printf(format, table, i, ret); +} |