* Fixed a _horrible_ bug where 'tar -tvf' could unlink

    local files!!!  Fix thanks to Marius Groeger <mgroeger@sysgo.de>
* Added support for "sh -c command args...", also thanks to
    Marius Groeger <mgroeger@sysgo.de>

 -Erik

1 files changed, 56 insertions, 20 deletions

diff --git a/shell/lash.c b/shell/lash.c
index 56d94258c..785e9cc3f 100644
--- a/shell/lash.c
+++ b/shell/lash.c
@@ -131,8 +131,8 @@ static struct builtInCommand bltins_forking[] = {
 };
 
 static const char shell_usage[] =
-
-        "sh [FILE]...\n" 
+        "sh [FILE]...\n"
+        "   or: sh -c command [args]...\n"
 #ifndef BB_FEATURE_TRIVIAL_HELP
         "\nlash: The BusyBox command interpreter (shell).\n\n"
 #endif
@@ -140,6 +140,7 @@ static const char shell_usage[] =
 
 static char cwd[1024];
 static char *prompt = "# ";
+static char *local_pending_command = NULL;
 
 #ifdef BB_FEATURE_SH_COMMAND_EDITING
 void win_changed(int sig)
@@ -225,8 +226,9 @@ static int shell_fg_bg(struct job *cmd, struct jobSet *jobList)
 
         if (*cmd->progs[0].argv[0] == 'f') {
                 /* Make this job the foreground job */
-                if (tcsetpgrp(0, job->pgrp))
-                        perror("tcsetpgrp");
+                /* suppress messages when run from /linuxrc mag@sysgo.de */
+                if (tcsetpgrp(0, job->pgrp) && errno != ENOTTY)
+                        perror("tcsetpgrp"); 
                 jobList->fg = job;
         }
 
@@ -411,6 +413,17 @@ static void checkJobs(struct jobSet *jobList)
 
 static int getCommand(FILE * source, char *command)
 {
+        if (source == NULL) {
+                if (local_pending_command) {
+                        /* a command specified (-c option): return it & mark it done */
+                        strcpy(command, local_pending_command);
+                        free(local_pending_command);
+                        local_pending_command = NULL;
+                        return 0;
+                }
+                return 1;
+        }
+
         if (source == stdin) {
 #ifdef BB_FEATURE_SH_COMMAND_EDITING
                 int len;
@@ -842,7 +855,8 @@ static int runCommand(struct job newJob, struct jobSet *jobList, int inBg)
                 jobList->fg = job;
 
                 /* move the new process group into the foreground */
-                if (tcsetpgrp(0, newJob.pgrp))
+                /* suppress messages when run from /linuxrc mag@sysgo.de */
+                if (tcsetpgrp(0, newJob.pgrp) && errno != ENOTTY)
                         perror("tcsetpgrp");
         }
 
@@ -894,10 +908,14 @@ static int busy_loop(FILE * input)
         char *nextCommand = NULL;
         struct jobSet jobList = { NULL, NULL };
         struct job newJob;
+        pid_t  parent_pgrp;
         int i;
         int status;
         int inBg;
 
+        /* save current owner of TTY so we can restore it on exit */
+        parent_pgrp = tcgetpgrp(0);
+
         command = (char *) calloc(BUFSIZ, sizeof(char));
 
         /* don't pay any attention to this signal; it just confuses 
@@ -939,10 +957,6 @@ static int busy_loop(FILE * input)
 
                                         removeJob(&jobList, jobList.fg);
                                         jobList.fg = NULL;
-
-                                        /* move the shell to the foreground */
-                                        if (tcsetpgrp(0, getpid()))
-                                                perror("tcsetpgrp");
                                 }
                         } else {
                                 /* the child was stopped */
@@ -958,13 +972,18 @@ static int busy_loop(FILE * input)
 
                         if (!jobList.fg) {
                                 /* move the shell to the foreground */
-                                if (tcsetpgrp(0, getpid()))
-                                        perror("tcsetpgrp");
+                                /* suppress messages when run from /linuxrc mag@sysgo.de */
+                                if (tcsetpgrp(0, getpid()) && errno != ENOTTY)
+                                        perror("tcsetpgrp"); 
                         }
                 }
         }
         free(command);
 
+        /* return controlling TTY back to parent process group before exiting */
+        if (tcsetpgrp(0, parent_pgrp))
+                perror("tcsetpgrp"); 
+
         return 0;
 }
 
@@ -973,9 +992,6 @@ int shell_main(int argc, char **argv)
 {
         FILE *input = stdin;
 
-        if (argc > 2) {
-                usage(shell_usage);
-        }
         /* initialize the cwd */
         getcwd(cwd, sizeof(cwd));
 
@@ -993,13 +1009,33 @@ int shell_main(int argc, char **argv)
                 fprintf(stdout, "\n\nBusyBox v%s (%s) Built-in shell\n", BB_VER, BB_BT);
                 fprintf(stdout, "Enter 'help' for a list of built-in commands.\n\n");
         } else {
-                if (*argv[1]=='-') {
-                        usage("sh\n\nlash -- the BusyBox LAme SHell (command interpreter)\n");
+                if (argv[1][0]=='-' && argv[1][1]=='c') {
+                        int i;
+                        local_pending_command = (char *) calloc(BUFSIZ, sizeof(char));
+                        if (local_pending_command == 0) {
+                                fatalError("sh: out of memory\n");
+                        }
+                        for(i=2; i<argc; i++)
+                        {
+                                if (strlen(local_pending_command) + strlen(argv[i]) >= BUFSIZ) {
+                                  fatalError("sh: commands for -c option too long\n");
+                                }
+                                strcat(local_pending_command, argv[i]);
+                                if (i + 1 < argc)
+                                  strcat(local_pending_command, " ");
+                        }
+                        input = NULL;
+                          
                 }
-                input = fopen(argv[1], "r");
-                if (!input) {
-                        fatalError("sh: Couldn't open file '%s': %s\n", argv[1],
-                                           strerror(errno));
+                else if (argv[1][0]=='-') {
+                        usage(shell_usage);
+                }
+                else {
+                        input = fopen(argv[1], "r");
+                        if (!input) {
+                                fatalError("sh: Couldn't open file '%s': %s\n", argv[1],
+                                                   strerror(errno));
+                        }
                 }
         }