librc: skeleton of user services support

Those functions allocates and set up the environment for user services.

Signed-off-by: Anna (navi) Figueiredo Gomes <navi@vlhl.dev>

3 files changed, 109 insertions, 0 deletions

diff --git a/src/librc/librc.c b/src/librc/librc.c
index a1bd706d..b3c98adb 100644
--- a/src/librc/librc.c
+++ b/src/librc/librc.c
@@ -33,6 +33,7 @@
 
 #include "queue.h"
 #include "librc.h"
+#include "einfo.h"
 #include "misc.h"
 #include "rc.h"
 #ifdef __FreeBSD__
@@ -349,6 +350,93 @@ detect_vm(const char *systype RC_UNUSED)
 	return NULL;
 }
 
+#ifdef RC_USER_SERVICES
+
+bool
+rc_is_user(void)
+{
+	char *env;
+	if ((env = getenv("RC_USER_SERVICES"))) {
+		return (strcmp(env, "YES") == 0);
+	}
+	return false;
+}
+
+void
+rc_set_user(void)
+{
+	char *path, *tmp;
+
+	/* Setting the sysconf path to XDG_CONFIG_HOME, or ~/.config/, so subdirectories would go:
+	* ~/.config/init.d
+	* ~/.config/conf.d
+	* ~/.config/runlevels
+	* ~/.config/rc.conf */
+	path = rc_user_sysconfdir();
+	if (mkdir(path, 0700) != 0 && errno != EEXIST) {
+		eerrorx("mkdir: %s", strerror(errno));
+	}
+	xasprintf(&tmp, "%s/%s", path, RC_USER_INITDIR_FOLDER);
+	if (mkdir(tmp, 0700) != 0 && errno != EEXIST) {
+		eerrorx("mkdir: %s", strerror(errno));
+	}
+	free(tmp);
+	xasprintf(&tmp, "%s/%s", path, RC_USER_CONFDIR_FOLDER);
+	if (mkdir(tmp, 0700) != 0 && errno != EEXIST) {
+		eerrorx("mkdir: %s", strerror(errno));
+	}
+	free(tmp);
+	xasprintf(&tmp, "%s/%s", path, RC_USER_RUNLEVELS_FOLDER);
+	if (mkdir(tmp, 0700) != 0 && errno != EEXIST) {
+		eerrorx("mkdir: %s", strerror(errno));
+	}
+	free(tmp);
+	xasprintf(&tmp, "%s/%s/%s", path, RC_USER_RUNLEVELS_FOLDER, RC_LEVEL_DEFAULT);
+	if (mkdir(tmp, 0700) != 0 && errno != EEXIST) {
+		eerrorx("mkdir: %s", strerror(errno));
+	}
+	free(tmp);
+	free(path);
+
+	path = rc_user_svcdir();
+	if (mkdir(path, 0700) != 0 && errno != EEXIST) {
+		eerrorx("mkdir: %s", strerror(errno));
+	}
+	free(path);
+
+	setenv("RC_USER_SERVICES", "YES", 1);
+}
+
+char *
+rc_user_sysconfdir(void)
+{
+	char *env, *path = NULL;
+	if ((env = getenv("XDG_CONFIG_HOME"))) {
+		xasprintf(&path, "%s", env);
+	} else if ((env = getenv("HOME"))) {
+		xasprintf(&path, "%s/.config/", env);
+	} else {
+		eerrorx("Both XDG_CONFIG_HOME and HOME unset.");
+	}
+	return path;
+}
+
+char *
+rc_user_svcdir(void)
+{
+	char *env, *path = NULL;
+	uid_t id;
+	if ((env = getenv("XDG_RUNTIME_DIR"))) {
+		xasprintf(&path, "%s%s", env, RC_USER_RUNTIME_FOLDER);
+	} else {
+		id = getuid();
+		xasprintf(&path, "/tmp%s/%d/", RC_USER_RUNTIME_FOLDER, id);
+	}
+	return path;
+}
+
+#endif
+
 const char *
 rc_sys(void)
 {
diff --git a/src/librc/meson.build b/src/librc/meson.build
index 30caa1f3..3020e9f2 100644
--- a/src/librc/meson.build
+++ b/src/librc/meson.build
@@ -25,8 +25,10 @@ rc_h = configure_file(input : 'rc.h.in', output : 'rc.h',
 
 librc = library('rc', librc_sources,
   dependencies: kvm_dep,
+  c_args : cc_user_services_flags,
   include_directories : [incdir, einfo_incdir],
   link_depends : 'rc.map',
+  link_with: libeinfo,
   version : librc_version,
   install : true,
   install_dir : libdir)
diff --git a/src/librc/rc.h.in b/src/librc/rc.h.in
index 69d9d0e4..02e7d53f 100644
--- a/src/librc/rc.h.in
+++ b/src/librc/rc.h.in
@@ -47,6 +47,25 @@ extern "C" {
 #define RC_CONF_D         RC_SYSCONFDIR "/rc.conf.d"
 #define RC_CONF_OLD     RC_SYSCONFDIR "/conf.d/rc"
 
+#ifdef RC_USER_SERVICES
+
+#define RC_SYS_USER_INITDIR              RC_INITDIR "/user.d"
+#define RC_SYS_USER_CONFDIR              RC_CONFDIR "/user.d"
+#define RC_USER_INITDIR_FOLDER           "/init.d"
+#define RC_USER_CONFDIR_FOLDER           "/conf.d"
+#define RC_USER_RUNLEVELS_FOLDER         "/runlevels"
+#define RC_USER_RUNTIME_FOLDER           "/openrc"
+
+/*! Is openrc being ran in usermode?
+ * @return true if yes, otherwise false */
+bool rc_is_user(void);
+
+void rc_set_user(void);
+
+char *rc_user_sysconfdir(void);
+char *rc_user_svcdir(void);
+#endif
+
 #define RC_PATH_PREFIX     RC_LIBEXECDIR "/bin:/bin:/sbin:/usr/bin:/usr/sbin"
 
 /* PKG_PREFIX is where packages are installed if different from the base OS