X-Git-Url: http://git.annexia.org/?p=libguestfs.git;a=blobdiff_plain;f=fish%2Ffish.c;h=b825626bcf3c39bbfbe9956fe89ffb53d64b377e;hp=0fc14ce15dd2c1a962af170971d43663d260ba1f;hb=946eec285f634e51b3ea6416a6d7947427c66797;hpb=8358ea9524509c02448fe52d5bea205c9c3f869e diff --git a/fish/fish.c b/fish/fish.c index 0fc14ce..b825626 100644 --- a/fish/fish.c +++ b/fish/fish.c @@ -18,11 +18,21 @@ #include +#define _GNU_SOURCE // for strchrnul + #include #include #include #include +#include #include +#include +#include + +#ifdef HAVE_LIBREADLINE +#include +#include +#endif #include @@ -40,6 +50,10 @@ static void shell_script (void); static void script (int prompt); static void cmdline (char *argv[], int optind, int argc); static int issue_command (const char *cmd, char *argv[]); +static int parse_size (const char *str, off_t *size_rtn); +static void initialize_readline (void); +static void cleanup_readline (void); +static void add_history_line (const char *); /* Currently open libguestfs handle. */ guestfs_h *g; @@ -49,8 +63,10 @@ int quit = 0; int verbose = 0; int -launch (void) +launch (guestfs_h *_g) { + assert (_g == g); + if (!g_launched) { if (guestfs_launch (g) == -1) return -1; @@ -106,6 +122,8 @@ main (int argc, char *argv[]) char *p; int c; + initialize_readline (); + /* guestfs_create is meant to be a lightweight operation, so * it's OK to do it early here. */ @@ -162,7 +180,7 @@ main (int argc, char *argv[]) mp->mountpoint = "/"; mp->device = optarg; mp->next = mps; - mps = mp->next; + mps = mp; break; case 'n': @@ -186,7 +204,7 @@ main (int argc, char *argv[]) /* If we've got mountpoints, we must launch the guest and mount them. */ if (mps != NULL) { - if (launch () == -1) exit (1); + if (launch (g) == -1) exit (1); mount_mps (mps); } @@ -200,6 +218,8 @@ main (int argc, char *argv[]) else cmdline (argv, optind, argc); + cleanup_readline (); + exit (0); } @@ -246,13 +266,51 @@ shell_script (void) script (0); } +#define FISH "> " + +static char *line_read = NULL; + +static char * +rl_gets (int prompt) +{ +#ifdef HAVE_LIBREADLINE + + if (line_read) { + free (line_read); + line_read = NULL; + } + + line_read = readline (prompt ? FISH : ""); + + if (prompt && line_read && *line_read) + add_history_line (line_read); + +#else /* !HAVE_LIBREADLINE */ + + static char buf[8192]; + int len; + + if (prompt) printf (FISH); + line_read = fgets (buf, sizeof buf, stdin); + + if (line_read) { + len = strlen (line_read); + if (len > 0 && buf[len-1] == '\n') buf[len-1] = '\0'; + } + +#endif /* !HAVE_LIBREADLINE */ + + return line_read; +} + static void script (int prompt) { - char buf[8192]; + char *buf; char *cmd; + char *p, *pend; char *argv[64]; - int len, i; + int i, len; if (prompt) printf ("\n" @@ -264,30 +322,124 @@ script (int prompt) "\n"); while (!quit) { - if (prompt) printf ("> "); - if (fgets (buf, sizeof buf, stdin) == NULL) { + buf = rl_gets (prompt); + if (!buf) { quit = 1; break; } - len = strlen (buf); - if (len > 0 && buf[len-1] == '\n') buf[len-1] = '\0'; + /* Skip any initial whitespace before the command. */ + while (*buf && isspace (*buf)) + buf++; - /* Split the buffer up at whitespace. */ - cmd = strtok (buf, " \t"); - if (cmd == NULL) - continue; + /* Get the command (cannot be quoted). */ + len = strcspn (buf, " \t"); + if (len == 0) continue; + + cmd = buf; i = 0; - while (i < sizeof argv / sizeof argv[0] && - (argv[i] = strtok (NULL, " \t")) != NULL) - i++; + if (buf[len] == '\0') { + argv[0] = NULL; + goto got_command; + } + + buf[len] = '\0'; + p = &buf[len+1]; + p += strspn (p, " \t"); + + /* Get the parameters. */ + while (*p && i < sizeof argv / sizeof argv[0]) { + /* Parameters which start with quotes or square brackets + * are treated specially. Bare parameters are delimited + * by whitespace. + */ + if (*p == '"') { + p++; + len = strcspn (p, "\""); + if (p[len] == '\0') { + fprintf (stderr, "guestfish: unterminated double quote\n"); + if (!prompt) exit (1); + goto next_command; + } + if (p[len+1] && (p[len+1] != ' ' && p[len+1] != '\t')) { + fprintf (stderr, "guestfish: command arguments not separated by whitespace\n"); + if (!prompt) exit (1); + goto next_command; + } + p[len] = '\0'; + pend = &p[len+2]; + } else if (*p == '\'') { + p++; + len = strcspn (p, "'"); + if (p[len] == '\0') { + fprintf (stderr, "guestfish: unterminated single quote\n"); + if (!prompt) exit (1); + goto next_command; + } + if (p[len+1] && (p[len+1] != ' ' && p[len+1] != '\t')) { + fprintf (stderr, "guestfish: command arguments not separated by whitespace\n"); + if (!prompt) exit (1); + goto next_command; + } + p[len] = '\0'; + pend = &p[len+2]; + /* + } else if (*p == '[') { + int c = 1; + p++; + pend = p; + while (*pend && c != 0) { + if (*pend == '[') c++; + else if (*pend == ']') c--; + pend++; + } + if (c != 0) { + fprintf (stderr, "guestfish: unterminated \"[...]\" sequence\n"); + if (!prompt) exit (1); + goto next_command; + } + if (*pend && (*pend != ' ' && *pend != '\t')) { + fprintf (stderr, "guestfish: command arguments not separated by whitespace\n"); + if (!prompt) exit (1); + goto next_command; + } + *(pend-1) = '\0'; + */ + } else if (*p != ' ' && *p != '\t') { + len = strcspn (p, " \t"); + if (p[len]) { + p[len] = '\0'; + pend = &p[len+1]; + } else + pend = &p[len]; + } else { + fprintf (stderr, "guestfish: internal error parsing string at '%s'\n", + p); + abort (); + } + + argv[i++] = p; + p = pend; + + if (*p) + p += strspn (p, " \t"); + } + if (i == sizeof argv / sizeof argv[0]) { - fprintf (stderr, "guestfish: too many arguments in command\n"); - exit (1); + fprintf (stderr, "guestfish: too many arguments\n"); + if (!prompt) exit (1); + goto next_command; + } + + argv[i] = NULL; + + got_command: + if (issue_command (cmd, argv) == -1) { + if (!prompt) exit (1); } - (void) issue_command (cmd, argv); + next_command:; } if (prompt) printf ("\n"); } @@ -337,33 +489,54 @@ issue_command (const char *cmd, char *argv[]) } else if (strcasecmp (cmd, "quit") == 0 || strcasecmp (cmd, "exit") == 0 || - strcasecmp (cmd, "q") == 0) - exit (0); - else if (strcasecmp (cmd, "add") == 0 || - strcasecmp (cmd, "drive") == 0 || - strcasecmp (cmd, "add_drive") == 0) { - if (argc != 1) { - fprintf (stderr, "use 'add image' to add a guest image\n"); - return -1; - } - else - return guestfs_add_drive (g, argv[0]); + strcasecmp (cmd, "q") == 0) { + quit = 1; + return 0; } - else if (strcasecmp (cmd, "cdrom") == 0) { - if (argc != 1) { - fprintf (stderr, "use 'cdrom image' to add a CD-ROM image\n"); + else if (strcasecmp (cmd, "alloc") == 0 || + strcasecmp (cmd, "allocate") == 0) { + if (argc != 2) { + fprintf (stderr, "use 'alloc file size' to create an image\n"); return -1; } - else - return guestfs_add_cdrom (g, argv[0]); - } - else if (strcasecmp (cmd, "launch") == 0) { - if (argc != 0) { - fprintf (stderr, "'launch' command takes no parameters\n"); - return -1; + else { + off_t size; + int fd; + + if (parse_size (argv[1], &size) == -1) + return -1; + + if (g_launched) { + fprintf (stderr, "can't allocate or add disks after launching\n"); + return -1; + } + + fd = open (argv[0], O_WRONLY|O_CREAT|O_NOCTTY|O_NONBLOCK|O_TRUNC, 0666); + if (fd == -1) { + perror (argv[0]); + return -1; + } + + if (posix_fallocate (fd, 0, size) == -1) { + perror ("fallocate"); + close (fd); + unlink (argv[0]); + return -1; + } + + if (close (fd) == -1) { + perror (argv[0]); + unlink (argv[0]); + return -1; + } + + if (guestfs_add_drive (g, argv[0]) == -1) { + unlink (argv[0]); + return -1; + } + + return 0; } - else - return launch (); } else return run_action (cmd, argc, argv); @@ -372,27 +545,39 @@ issue_command (const char *cmd, char *argv[]) void list_builtin_commands (void) { + /* help and quit should appear at the top */ printf ("%-20s %s\n", "help", "display a list of commands or help on a command"); printf ("%-20s %s\n", "quit", "quit guestfish"); + printf ("%-20s %s\n", - "add", "add a guest image to be examined or modified"); - printf ("%-20s %s\n", - "cdrom", "add a CD-ROM image to be examined"); - printf ("%-20s %s\n", - "launch", "launch the subprocess"); + "alloc", "allocate an image"); + + /* actions are printed after this (see list_commands) */ } void display_builtin_command (const char *cmd) { - if (strcasecmp (cmd, "add") == 0) - printf ("add - add a guest image to be examined or modified\n" - " add \n"); - else if (strcasecmp (cmd, "cdrom") == 0) - printf ("cdrom - add a CD-ROM image to be examined\n" - " cdrom \n"); + /* help for actions is auto-generated, see display_command */ + + if (strcasecmp (cmd, "alloc") == 0) + printf ("alloc - allocate an image\n" + " alloc \n" + "\n" + " This creates an empty (zeroed) file of the given size,\n" + " and then adds so it can be further examined.\n" + "\n" + " For more advanced image creation, see qemu-img utility.\n" + "\n" + " Size can be specified (where means a number):\n" + " number of kilobytes\n" + " eg: 1440 standard 3.5\" floppy\n" + " K or KB number of kilobytes\n" + " M or MB number of megabytes\n" + " G or GB number of gigabytes\n" + " sects number of 512 byte sectors\n"); else if (strcasecmp (cmd, "help") == 0) printf ("help - display a list of commands or help on a command\n" " help cmd\n" @@ -400,10 +585,152 @@ display_builtin_command (const char *cmd) else if (strcasecmp (cmd, "quit") == 0) printf ("quit - quit guestfish\n" " quit\n"); - else if (strcasecmp (cmd, "launch") == 0) - printf ("launch - launch the subprocess\n" - " launch\n"); else fprintf (stderr, "%s: command not known, use -h to list all commands\n", cmd); } + +/* Parse size parameter of alloc command. */ +static int +parse_size (const char *str, off_t *size_rtn) +{ + uint64_t size; + char type; + + /* Note that the parsing here is looser than what is specified in the + * help, but we may tighten it up in future so beware. + */ + if (sscanf (str, "%"SCNu64"%c", &size, &type) == 2) { + switch (type) { + case 'k': case 'K': size *= 1024; break; + case 'm': case 'M': size *= 1024 * 1024; break; + case 'g': case 'G': size *= 1024 * 1024 * 1024; break; + case 's': size *= 512; break; + default: + fprintf (stderr, "could not parse size specification '%s'\n", str); + return -1; + } + } + else if (sscanf (str, "%"SCNu64, &size) == 1) + size *= 1024; + else { + fprintf (stderr, "could not parse size specification '%s'\n", str); + return -1; + } + + /* XXX 32 bit file offsets, if anyone uses them? GCC should give + * a warning here anyhow. + */ + *size_rtn = size; + + return 0; +} + +void +free_strings (char **argv) +{ + int argc; + + for (argc = 0; argv[argc] != NULL; ++argc) + free (argv[argc]); + free (argv); +} + +void +print_strings (char * const * const argv) +{ + int argc; + + for (argc = 0; argv[argc] != NULL; ++argc) + printf ("%s\n", argv[argc]); +} + +int +is_true (const char *str) +{ + return + strcasecmp (str, "0") != 0 && + strcasecmp (str, "f") != 0 && + strcasecmp (str, "false") != 0 && + strcasecmp (str, "n") != 0 && + strcasecmp (str, "no") != 0; +} + +/* XXX We could improve list parsing. */ +char ** +parse_string_list (const char *str) +{ + char **argv; + const char *p, *pend; + int argc, i; + + argc = 1; + for (i = 0; str[i]; ++i) + if (str[i] == ' ') argc++; + + argv = malloc (sizeof (char *) * (argc+1)); + if (argv == NULL) { perror ("malloc"); exit (1); } + + p = str; + i = 0; + while (*p) { + pend = strchrnul (p, ' '); + argv[i] = strndup (p, pend-p); + i++; + p = *pend == ' ' ? pend+1 : pend; + } + argv[i] = NULL; + + return argv; +} + +#ifdef HAVE_LIBREADLINE +static char histfile[1024]; +static int nr_history_lines = 0; +#endif + +static void +initialize_readline (void) +{ +#ifdef HAVE_LIBREADLINE + const char *home; + + home = getenv ("HOME"); + if (home) { + snprintf (histfile, sizeof histfile, "%s/.guestfish", home); + using_history (); + (void) read_history (histfile); + } + + rl_readline_name = "guestfish"; + rl_attempted_completion_function = do_completion; +#endif +} + +static void +cleanup_readline (void) +{ +#ifdef HAVE_LIBREADLINE + int fd; + + if (histfile[0] != '\0') { + fd = open (histfile, O_WRONLY|O_CREAT, 0644); + if (fd == -1) { + perror (histfile); + return; + } + close (fd); + + (void) append_history (nr_history_lines, histfile); + } +#endif +} + +static void +add_history_line (const char *line) +{ +#ifdef HAVE_LIBREADLINE + add_history (line); + nr_history_lines++; +#endif +}