From: Richard Jones Date: Fri, 3 Apr 2009 23:58:40 +0000 (+0100) Subject: Command line and interactive shell parsing, prompts etc. X-Git-Tag: 0.4~23 X-Git-Url: http://git.annexia.org/?p=libguestfs.git;a=commitdiff_plain;h=4567839859befc5aa9e1eee942dc2ba0701516e2 Command line and interactive shell parsing, prompts etc. --- diff --git a/fish/fish.c b/fish/fish.c index 8554300..a252516 100644 --- a/fish/fish.c +++ b/fish/fish.c @@ -1,4 +1,4 @@ -/* guestfish - the filesystem shell +/* guestfish - the filesystem interactive shell * Copyright (C) 2009 Red Hat Inc. * * This program is free software; you can redistribute it and/or modify @@ -28,6 +28,37 @@ #include "fish.h" +struct mp { + struct mp *next; + char *device; + char *mountpoint; +}; + +static void mount_mps (struct mp *mp); +static void interactive (void); +static void shell_script (void); +static void script (int prompt); +static void cmdline (char *argv[], int optind, int argc); +static void issue_command (const char *cmd, char *argv[]); + +/* Currently open libguestfs handle. */ +guestfs_h *g; +int g_launched = 0; + +int quit = 0; + +void +launch (void) +{ + if (!g_launched) { + if (guestfs_launch (g) == -1) + exit (1); + if (guestfs_wait_ready (g) == -1) + exit (1); + g_launched = 1; + } +} + static void usage (void) { @@ -36,7 +67,7 @@ usage (void) "guestfish lets you edit virtual machine filesystems\n" "Copyright (C) 2009 Red Hat Inc.\n" "Usage:\n" - " guestfish [--options] [cmd]\n" + " guestfish [--options] cmd [: cmd ...]\n" "or for interactive use:\n" " guestfish\n" "or from a shell script:\n" @@ -47,25 +78,53 @@ usage (void) "Options:\n" " -h|--cmd-help List available commands\n" " -h|--cmd-help cmd Display detailed help on 'cmd'\n" - "For more information, see the manual page guestfish(1).\n"); + " -a image Add image\n" + " -m dev[:mnt] Mount dev on mnt (if omitted, /)\n" + /*" --ro|-r All mounts are read-only\n"*/ + " -v|--verbose Verbose messages\n" + "For more information, see the manpage guestfish(1).\n"); } int main (int argc, char *argv[]) { - static const char *options = "h::?"; + static const char *options = "a:h::m:v?"; static struct option long_options[] = { + { "add", 1, 0, 'a' }, { "cmd-help", 2, 0, 'h' }, { "help", 0, 0, '?' }, + { "mount", 1, 0, 'm' }, + { "verbose", 0, 0, 'v' }, { 0, 0, 0, 0 } }; + struct mp *mps = NULL; + struct mp *mp; + char *p; int c; + /* guestfs_create is meant to be a lightweight operation, so + * it's OK to do it early here. + */ + g = guestfs_create (); + if (g == NULL) { + fprintf (stderr, "guestfs_create: failed to create handle\n"); + exit (1); + } + for (;;) { c = getopt_long (argc, argv, options, long_options, NULL); if (c == -1) break; switch (c) { + case 'a': + if (access (optarg, R_OK) != 0) { + perror (optarg); + exit (1); + } + if (guestfs_add_drive (g, optarg) == -1) + exit (1); + break; + case 'h': if (optarg) display_command (optarg); @@ -75,6 +134,23 @@ main (int argc, char *argv[]) list_commands (); exit (0); + case 'm': + mp = malloc (sizeof (struct mp)); + if (!mp) { + perror ("malloc"); + exit (1); + } + p = strchr (optarg, ':'); + if (p) { + *p = '\0'; + mp->mountpoint = p+1; + } else + mp->mountpoint = "/"; + mp->device = optarg; + mp->next = mps; + mps = mp->next; + break; + case '?': usage (); exit (0); @@ -85,21 +161,21 @@ main (int argc, char *argv[]) } } - if (optind < argc) { - usage (); - exit (1); + /* If we've got mountpoints, we must launch the guest and mount them. */ + if (mps != NULL) { + launch (); + mount_mps (mps); } - - - - - - - - - - + /* Interactive, shell script, or command(s) on the command line? */ + if (optind >= argc) { + if (isatty (0)) + interactive (); + else + shell_script (); + } + else + cmdline (argv, optind, argc); exit (0); } @@ -123,3 +199,115 @@ pod2text (const char *heading, const char *str) fputs (str, fp); pclose (fp); } + +/* List is built in reverse order, so mount them in reverse order. */ +static void +mount_mps (struct mp *mp) +{ + if (mp) { + mount_mps (mp->next); + if (guestfs_mount (g, mp->device, mp->mountpoint) == -1) + exit (1); + } +} + +static void +interactive (void) +{ + script (1); +} + +static void +shell_script (void) +{ + script (0); +} + +static void +script (int prompt) +{ + char buf[8192]; + char *cmd; + char *argv[64]; + int len, i; + + if (prompt) + printf ("Welcome to guestfish, the libguestfs filesystem interactive shell for\n" + "editing virtual machine filesystems.\n" + "\n" + "Type: 'help' for help with commands\n" + " 'quit' to quit the shell\n" + "\n"); + + while (!quit) { + if (prompt) printf ("> "); + if (fgets (buf, sizeof buf, stdin) == NULL) { + quit = 1; + break; + } + + len = strlen (buf); + if (len > 0 && buf[len-1] == '\n') buf[len-1] = '\0'; + + /* Split the buffer up at whitespace. */ + cmd = strtok (buf, " \t"); + if (cmd == NULL) + continue; + + i = 0; + while (i < sizeof argv / sizeof argv[0] && + (argv[i] = strtok (NULL, " \t")) != NULL) + i++; + if (i == sizeof argv / sizeof argv[0]) { + fprintf (stderr, "guestfish: too many arguments in command\n"); + exit (1); + } + + issue_command (cmd, argv); + } + if (prompt) printf ("\n"); +} + +static void +cmdline (char *argv[], int optind, int argc) +{ + const char *cmd; + char **params; + + if (optind >= argc) return; + + cmd = argv[optind++]; + if (strcmp (cmd, ":") == 0) { + fprintf (stderr, "guestfish: empty command on command line\n"); + exit (1); + } + params = &argv[optind]; + + /* Search for end of command list or ":" ... */ + while (optind < argc && strcmp (argv[optind], ":") != 0) + optind++; + + if (optind == argc) + issue_command (cmd, params); + else { + argv[optind] = NULL; + issue_command (cmd, params); + cmdline (argv, optind+1, argc); + } +} + +static void +issue_command (const char *cmd, char *argv[]) +{ + int i; + + fprintf (stderr, "cmd = %s", cmd); + for (i = 0; argv[i] != NULL; ++i) + fprintf (stderr, ", arg[%d]=%s", i, argv[i]); + fprintf (stderr, "\n"); + + + + + +} diff --git a/fish/fish.h b/fish/fish.h index 3e81170..09a9ef2 100644 --- a/fish/fish.h +++ b/fish/fish.h @@ -19,7 +19,12 @@ #ifndef FISH_H #define FISH_H +#include + /* in fish.c */ +extern guestfs_h *g; +extern int g_launched; +extern int quit; extern void pod2text (const char *heading, const char *body); /* in cmds.c (auto-generated) */