Honor --shell option when joining

1 files changed, 64 insertions, 23 deletions

diff --git a/src/firejail/join.c b/src/firejail/join.c
index 504748331..c14108986 100644
--- a/src/firejail/join.c
+++ b/src/firejail/join.c
@@ -352,17 +352,25 @@ void join(pid_t pid, int argc, char **argv, int index) {
 
                 // run cmdline trough /bin/bash
                 if (cfg.command_line == NULL) {
-                        struct stat s;
 
                         // replace the process with a shell
-                        if (stat("/bin/bash", &s) == 0)
-                                execlp("/bin/bash", "/bin/bash", NULL);
-                        else if (stat("/usr/bin/zsh", &s) == 0)
-                                execlp("/usr/bin/zsh", "/usr/bin/zsh", NULL);
-                        else if (stat("/bin/csh", &s) == 0)
-                                execlp("/bin/csh", "/bin/csh", NULL);
-                        else if (stat("/bin/sh", &s) == 0)
-                                execlp("/bin/sh", "/bin/sh", NULL);
+                        if (cfg.shell)
+                                        execlp(cfg.shell, cfg.shell, NULL);
+                                else if (arg_zsh)
+                                        execlp("/usr/bin/zsh", "/usr/bin/zsh", NULL);
+                                else if (arg_csh)
+                                        execlp("/bin/csh", "/bin/csh", NULL);
+                                else {
+                                        struct stat s;
+                                        if (stat("/bin/bash", &s) == 0)
+                                                execlp("/bin/bash", "/bin/bash", NULL);
+                                        else if (stat("/usr/bin/zsh", &s) == 0)
+                                                execlp("/usr/bin/zsh", "/usr/bin/zsh", NULL);
+                                        else if (stat("/bin/csh", &s) == 0)
+                                                execlp("/bin/csh", "/bin/csh", NULL);
+                                        else if (stat("/bin/sh", &s) == 0)
+                                                execlp("/bin/sh", "/bin/sh", NULL);
+                                }
                         
                         // no shell found, print an error and exit
                         fprintf(stderr, "Error: no POSIX shell found\n");
@@ -389,21 +397,54 @@ void join(pid_t pid, int argc, char **argv, int index) {
                                 }
                         }
 
-                        char *arg[5];
-                        arg[0] = "/bin/bash";
-                        arg[1] = "-c";
-                        if (arg_debug)
-                                printf("Starting %s\n", cfg.command_line);
-                        if (!arg_doubledash) {
-                                arg[2] = cfg.command_line;
-                                arg[3] = NULL;
-                        }
-                        else {
-                                arg[2] = "--";
-                                arg[3] = cfg.command_line;
-                                arg[4] = NULL;
+                        if (arg_shell_none) {
+                                if (arg_debug) {
+                                        int i;
+                                        for (i = cfg.original_program_index; i < cfg.original_argc; i++) {
+                                                if (cfg.original_argv[i] == NULL)
+                                                        break;
+                                                printf("execvp argument %d: %s\n", i - cfg.original_program_index, cfg.original_argv[i]);
+                                        }
+                                }
+                
+                                if (cfg.original_program_index == 0) {
+                                        fprintf(stderr, "Error: --shell=none configured, but no program specified\n");
+                                        exit(1);
+                                }
+                
+                                if (!arg_command && !arg_quiet)
+                                        printf("Child process initialized\n");
+                
+                                execvp(cfg.original_argv[cfg.original_program_index], &cfg.original_argv[cfg.original_program_index]);
+                                exit(1);
+                        } else {
+                                // choose the shell requested by the user, or use bash as default
+                                char *sh;
+                                if (cfg.shell)
+                                        sh = cfg.shell;
+                                else if (arg_zsh)
+                                        sh = "/usr/bin/zsh";
+                                else if (arg_csh)
+                                        sh = "/bin/csh";
+                                else
+                                        sh = "/bin/bash";
+        
+                                char *arg[5];
+                                arg[0] = sh;
+                                arg[1] = "-c";
+                                if (arg_debug)
+                                        printf("Starting %s\n", cfg.command_line);
+                                if (!arg_doubledash) {
+                                        arg[2] = cfg.command_line;
+                                        arg[3] = NULL;
+                                }
+                                else {
+                                        arg[2] = "--";
+                                        arg[3] = cfg.command_line;
+                                        arg[4] = NULL;
+                                }
+                                execvp("/bin/bash", arg);
                         }
-                        execvp("/bin/bash", arg);
                 }
 
                 // it will never get here!!!