1 files changed, 148 insertions, 0 deletions
diff --git a/src/shared/install-printf.c b/src/shared/install-printf.c
new file mode 100644
index 0000000..d2143be
--- /dev/null
+++ b/src/shared/install-printf.c
@@ -0,0 +1,148 @@
+/* SPDX-License-Identifier: LGPL-2.1+ */
+
+#include <errno.h>
+#include <stdio.h>
+#include <string.h>
+#include <unistd.h>
+
+#include "format-util.h"
+#include "install-printf.h"
+#include "install.h"
+#include "macro.h"
+#include "specifier.h"
+#include "string-util.h"
+#include "unit-name.h"
+#include "user-util.h"
+
+static int specifier_prefix_and_instance(char specifier, const void *data, const 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);
+                if (!ans)
+                        return -ENOMEM;
+                *ret = ans;
+        } else
+                *ret = TAKE_PTR(prefix);
+
+        return 0;
+}
+
+static int specifier_name(char specifier, const void *data, const 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, const void *data, const void *userdata, char **ret) {
+        const UnitFileInstallInfo *i = userdata;
+
+        assert(i);
+
+        return unit_name_to_prefix(i->name, ret);
+}
+
+static int specifier_instance(char specifier, const void *data, const 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)) {
+                r = free_and_strdup(&instance, strempty(i->default_instance));
+                if (r < 0)
+                        return r;
+        }
+
+        *ret = instance;
+        return 0;
+}
+
+static int specifier_last_component(char specifier, const void *data, const void *userdata, char **ret) {
+        _cleanup_free_ char *prefix = NULL;
+        char *dash;
+        int r;
+
+        r = specifier_prefix(specifier, data, userdata, &prefix);
+        if (r < 0)
+                return r;
+
+        dash = strrchr(prefix, '-');
+        if (dash) {
+                dash = strdup(dash + 1);
+                if (!dash)
+                        return -ENOMEM;
+                *ret = dash;
+        } else
+                *ret = TAKE_PTR(prefix);
+
+        return 0;
+}
+
+int install_full_printf(const 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 },
+                { 'j', specifier_last_component,      NULL },
+
+                { 'g', specifier_group_name,          NULL },
+                { 'G', specifier_group_id,            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);
+}