execute.c: always set $SHELL

In e6dca81 $SHELL was added to user@.service. Let's
instead provide it to all units which have a user.

4 files changed, 38 insertions, 42 deletions

diff --git a/TODO b/TODO
index 07269f47d2..425f6736c0 100644
--- a/TODO
+++ b/TODO
@@ -54,8 +54,6 @@ CGroup Rework Completion:
 
 Features:
 
-* set $SHELL where we set $HOME and $USER when User= is set of a service, drop its manual setting from user@.service
-
 * we probably should replace the left-over uses of strv_append() and replace them by strv_push() or strv_extend()
 
 * move config_parse_path_strv() out of conf-parser.c
diff --git a/man/systemd.exec.xml b/man/systemd.exec.xml
index f50161f30c..e213ec4f3c 100644
--- a/man/systemd.exec.xml
+++ b/man/systemd.exec.xml
@@ -1021,10 +1021,13 @@
 
                         <varlistentry>
                                 <term><varname>$USER</varname></term>
+                                <term><varname>$LOGNAME</varname></term>
                                 <term><varname>$HOME</varname></term>
+                                <term><varname>$SHELL</varname></term>
 
-                                <listitem><para>User name and home
-                                directory.  Set for the units which
+                                <listitem><para>User name (twice), home
+                                directory, and the login shell.
+                                Set for the units which
                                 have <varname>User=</varname> set,
                                 which includes user
                                 <command>systemd</command> instances.
@@ -1080,6 +1083,20 @@
                                 <citerefentry><refentrytitle>sd_listen_fds</refentrytitle><manvolnum>3</manvolnum></citerefentry>.
                                 </para></listitem>
                         </varlistentry>
+
+                        <varlistentry>
+                                <term><varname>$TERM</varname></term>
+
+                                <listitem><para>Terminal type, set
+                                only for units connected to a terminal
+                                (<varname>StandardInput=tty</varname>,
+                                <varname>StandardOutput=tty</varname>,
+                                or
+                                <varname>StandardError=tty</varname>).
+                                See
+                                <citerefentry><refentrytitle>termcap</refentrytitle><manvolnum>5</manvolnum></citerefentry>.
+                                </para></listitem>
+                        </varlistentry>
                 </variablelist>
 
                 <para>Additional variables may be configured by the
diff --git a/src/core/execute.c b/src/core/execute.c
index a53ef48ef8..3979f35988 100644
--- a/src/core/execute.c
+++ b/src/core/execute.c
@@ -1094,7 +1094,7 @@ int exec_spawn(ExecCommand *command,
         if (pid == 0) {
                 int i, err;
                 sigset_t ss;
-                const char *username = NULL, *home = NULL;
+                const char *username = NULL, *home = NULL, *shell = NULL;
                 uid_t uid = (uid_t) -1;
                 gid_t gid = (gid_t) -1;
                 _cleanup_strv_free_ char **our_env = NULL, **pam_env = NULL,
@@ -1277,7 +1277,7 @@ int exec_spawn(ExecCommand *command,
 
                 if (context->user) {
                         username = context->user;
-                        err = get_user_creds(&username, &uid, &gid, &home, NULL);
+                        err = get_user_creds(&username, &uid, &gid, &home, &shell);
                         if (err < 0) {
                                 r = EXIT_USER;
                                 goto fail_child;
@@ -1462,46 +1462,28 @@ int exec_spawn(ExecCommand *command,
                         }
                 }
 
-                our_env = new0(char*, 7);
-                if (!our_env) {
+                our_env = new(char*, 8);
+                if (!our_env ||
+                    (n_fds > 0 && (
+                            asprintf(our_env + n_env++, "LISTEN_PID=%lu", (unsigned long) getpid()) < 0 ||
+                            asprintf(our_env + n_env++, "LISTEN_FDS=%u", n_fds) < 0)) ||
+                    (home && asprintf(our_env + n_env++, "HOME=%s", home) < 0) ||
+                    (username && (
+                            asprintf(our_env + n_env++, "LOGNAME=%s", username) < 0 ||
+                            asprintf(our_env + n_env++, "USER=%s", username) < 0)) ||
+                    (shell && asprintf(our_env + n_env++, "SHELL=%s", shell) < 0) ||
+                    ((is_terminal_input(context->std_input) ||
+                      context->std_output == EXEC_OUTPUT_TTY ||
+                      context->std_error == EXEC_OUTPUT_TTY) && (
+                              !(our_env[n_env++] = strdup(default_term_for_tty(tty_path(context))))))) {
+
                         err = -ENOMEM;
                         r = EXIT_MEMORY;
                         goto fail_child;
                 }
 
-                if (n_fds > 0)
-                        if (asprintf(our_env + n_env++, "LISTEN_PID=%lu", (unsigned long) getpid()) < 0 ||
-                            asprintf(our_env + n_env++, "LISTEN_FDS=%u", n_fds) < 0) {
-                                err = -ENOMEM;
-                                r = EXIT_MEMORY;
-                                goto fail_child;
-                        }
-
-                if (home)
-                        if (asprintf(our_env + n_env++, "HOME=%s", home) < 0) {
-                                err = -ENOMEM;
-                                r = EXIT_MEMORY;
-                                goto fail_child;
-                        }
-
-                if (username)
-                        if (asprintf(our_env + n_env++, "LOGNAME=%s", username) < 0 ||
-                            asprintf(our_env + n_env++, "USER=%s", username) < 0) {
-                                err = -ENOMEM;
-                                r = EXIT_MEMORY;
-                                goto fail_child;
-                        }
-
-                if (is_terminal_input(context->std_input) ||
-                    context->std_output == EXEC_OUTPUT_TTY ||
-                    context->std_error == EXEC_OUTPUT_TTY)
-                        if (!(our_env[n_env++] = strdup(default_term_for_tty(tty_path(context))))) {
-                                err = -ENOMEM;
-                                r = EXIT_MEMORY;
-                                goto fail_child;
-                        }
-
-                assert(n_env <= 7);
+                our_env[n_env++] = NULL;
+                assert(n_env <= 8);
 
                 final_env = strv_env_merge(5,
                                            environment,
diff --git a/units/user@.service.in b/units/user@.service.in
index 3718a57087..3f8b59d07f 100644
--- a/units/user@.service.in
+++ b/units/user@.service.in
@@ -13,7 +13,6 @@ After=systemd-user-sessions.service
 User=%I
 PAMName=systemd-user
 Type=notify
-Environment=SHELL=%s
 ExecStart=-@rootlibexecdir@/systemd --user
 Environment=DBUS_SESSION_BUS_ADDRESS=unix:path=/run/user/%I/dbus/user_bus_socket
 Slice=user-%i.slice