The GOptionContext API has the benefit over getopt_long that it will
automatically handle --help output formatting.
Signed-off-by: Daniel P. Berrangé <berrange@xxxxxxxxxx>
---
tools/virsh.c | 304 +++++++++++++++++++++++---------------------------
1 file changed, 137 insertions(+), 167 deletions(-)
diff --git a/tools/virsh.c b/tools/virsh.c
index ec20f35a77..49aca96a8d 100644
--- a/tools/virsh.c
+++ b/tools/virsh.c
@@ -23,7 +23,6 @@
#include <stdarg.h>
#include <unistd.h>
-#include <getopt.h>
#include <sys/time.h>
#include <fcntl.h>
#include <time.h>
@@ -445,53 +444,36 @@ virshDeinit(vshControl *ctl)
}
/*
- * Print usage
+ * Build help description for commands
*/
-static void
-virshUsage(void)
+static char *
+virshBuildDescription(void)
{
const vshCmdGrp *grp;
const vshCmdDef *cmd;
-
- fprintf(stdout, _("\n%s [options]... [<command_string>]"
- "\n%s [options]... <command> [args...]\n\n"
- " options:\n"
- " -c | --connect=URI hypervisor connection URI\n"
- " -d | --debug=NUM debug level [0-4]\n"
- " -e | --escape <char> set escape sequence for console\n"
- " -h | --help this help\n"
- " -k | --keepalive-interval=NUM\n"
- " keepalive interval in seconds, 0 for disable\n"
- " -K | --keepalive-count=NUM\n"
- " number of possible missed keepalive messages\n"
- " -l | --log=FILE output logging to file\n"
- " -q | --quiet quiet mode\n"
- " -r | --readonly connect readonly\n"
- " -t | --timing print timing information\n"
- " -v short version\n"
- " -V long version\n"
- " --version[=TYPE] version, TYPE is short or long (default short)\n"
- " commands (non interactive mode):\n\n"), progname,
- progname);
+ GString *str = g_string_new("Commands (non interactive mode):\n\n");
for (grp = cmdGroups; grp->name; grp++) {
- fprintf(stdout, _(" %s (help keyword '%s')\n"),
- grp->name, grp->keyword);
+ g_string_append_printf(str,
+ _(" %s (help keyword '%s')\n"),
+ grp->name, grp->keyword);
for (cmd = grp->commands; cmd->name; cmd++) {
if (cmd->flags & VSH_CMD_FLAG_ALIAS)
continue;
- fprintf(stdout,
- " %-30s %s\n", cmd->name,
- _(vshCmddefGetInfo(cmd, "help")));
+ g_string_append_printf(str,
+ " %-30s %s\n",
+ cmd->name,
+ _(vshCmddefGetInfo(cmd, "help")));
}
- fprintf(stdout, "\n");
+ g_string_append_printf(str, "\n");
}
- fprintf(stdout, "%s",
- _("\n (specify help <group> for details about the commands in the group)\n"));
- fprintf(stdout, "%s",
- _("\n (specify help <command> for details about the command)\n\n"));
- return;
+ g_string_append_printf(str,
+ _("Specify help <group> for details about the commands in the group)\n"));
+ g_string_append_printf(str,
+ _("Specify help <command> for details about the command)\n"));
+
+ return g_string_free(str, FALSE);
}
/*
@@ -647,6 +629,22 @@ virshAllowedEscapeChar(char c)
('@' <= c && c <= '_');
}
+static gboolean
+virshVersion(const gchar *option_name G_GNUC_UNUSED,
+ const gchar *value,
+ gpointer data,
+ GError **error G_GNUC_UNUSED)
+{
+ vshControl *ctl = data;
+
+ if (STREQ(option_name, "-V") || STREQ_NULLABLE(value, "long"))
+ virshShowVersion(ctl);
+ else
+ puts(VERSION);
+
+ exit(EXIT_SUCCESS);
+}
+
/*
* argv[]: virsh [options] [command]
*
@@ -654,152 +652,124 @@ virshAllowedEscapeChar(char c)
static bool
virshParseArgv(vshControl *ctl, int argc, char **argv)
{
- int arg, len, debug, keepalive;
- size_t i;
- int longindex = -1;
+ int debug = 0;
+ size_t len;
virshControlPtr priv = ctl->privData;
- struct option opt[] = {
- {"connect", required_argument, NULL, 'c'},
- {"debug", required_argument, NULL, 'd'},
- {"escape", required_argument, NULL, 'e'},
- {"help", no_argument, NULL, 'h'},
- {"keepalive-interval", required_argument, NULL, 'k'},
- {"keepalive-count", required_argument, NULL, 'K'},
- {"log", required_argument, NULL, 'l'},
- {"quiet", no_argument, NULL, 'q'},
- {"readonly", no_argument, NULL, 'r'},
- {"timing", no_argument, NULL, 't'},
- {"version", optional_argument, NULL, 'v'},
- {NULL, 0, NULL, 0}
+ char *logfile = NULL;
+ int keepalive_interval = INT_MAX;
+ int keepalive_count = INT_MAX;
+ GOptionEntry opt[] = {
+ { "connect", 'c', 0,
+ G_OPTION_ARG_STRING, &ctl->connname,
+ _("hypervisor connection URI"), "URI" },
+ { "debug", 'd', 0,
+ G_OPTION_ARG_INT, &debug,
+ _("debug level [0-4]\n"), "LEVEL" },
+ { "escape", 'e', 0,
+ G_OPTION_ARG_STRING, &priv->escapeChar,
+ _("set escape sequence for console"), "ESCAPE" },
+ { "keepalive-interval", 'k', 0,
+ G_OPTION_ARG_INT, &keepalive_interval,
+ _("keepalive interval in seconds, 0 for disable"), "SECS" },
+ { "keepalive-count", 'K', 0,
+ G_OPTION_ARG_INT, &keepalive_count,
+ _("number of possible missed keepalive messages"), "NUM" },
+ { "log", 'l', 0,
+ G_OPTION_ARG_STRING, &logfile,
+ _("output logging to file"), "FILENAME" },
+ { "quiet", 'q', 0,
+ G_OPTION_ARG_NONE, &ctl->quiet,
+ _("quite mode"), NULL },
+ { "readonly", 'r', 0,
+ G_OPTION_ARG_NONE, &priv->readonly,
+ _("connect readonly"), NULL },
+ { "timing", 't', 0,
+ G_OPTION_ARG_NONE, &ctl->timing,
+ _("print timing information"), NULL },
+ { "version", 'v', G_OPTION_FLAG_OPTIONAL_ARG,
+ G_OPTION_ARG_CALLBACK, virshVersion,
+ _("print short version"), "[short]" },
+ { "version", 'V', G_OPTION_FLAG_OPTIONAL_ARG,
+ G_OPTION_ARG_CALLBACK, virshVersion,
+ _("print long version"), "long" },
+ { NULL, 0, 0, 0, NULL, NULL, NULL },
};
+ g_autoptr(GOptionContext) optctx = NULL;
+ GOptionGroup *optgrp;
+ g_autoptr(GError) error = NULL;
+
+ optctx = g_option_context_new(_("[COMMAND [OPTION…] - libvirt shell"));
+ optgrp = g_option_group_new(NULL, NULL, NULL, ctl, NULL);
+ g_option_group_set_translation_domain(optgrp, PACKAGE);
+ g_option_group_add_entries(optgrp, opt);
+ g_option_context_set_main_group(optctx, optgrp);
+ g_option_context_set_strict_posix(optctx, true);
+ g_option_context_set_description(optctx,
+ virshBuildDescription());
+
+ if (!g_option_context_parse(optctx, &argc, &argv, &error)) {
+ vshError(ctl, _("option parsing failed: %s\n"), error->message);
+ exit(EXIT_FAILURE);
+ }
- /* Standard (non-command) options. The leading + ensures that no
- * argument reordering takes place, so that command options are
- * not confused with top-level virsh options. */
- while ((arg = getopt_long(argc, argv, "+:c:d:e:hk:K:l:qrtvV", opt, &longindex)) != -1) {
- switch (arg) {
- case 'c':
- VIR_FREE(ctl->connname);
- ctl->connname = vshStrdup(ctl, optarg);
- break;
- case 'd':
- if (virStrToLong_i(optarg, NULL, 10, &debug) < 0) {
- vshError(ctl, _("option %s takes a numeric argument"),
- longindex == -1 ? "-d" : "--debug");
- exit(EXIT_FAILURE);
- }
- if (debug < VSH_ERR_DEBUG || debug > VSH_ERR_ERROR)
- vshError(ctl, _("ignoring debug level %d out of range [%d-%d]"),
- debug, VSH_ERR_DEBUG, VSH_ERR_ERROR);
- else
- ctl->debug = debug;
- break;
- case 'e':
- len = strlen(optarg);
-
- if ((len == 2 && *optarg == '^' &&
- virshAllowedEscapeChar(optarg[1])) ||
- (len == 1 && *optarg != '^')) {
- priv->escapeChar = optarg;
- } else {
- vshError(ctl, _("Invalid string '%s' for escape sequence"),
- optarg);
- exit(EXIT_FAILURE);
- }
- break;
- case 'h':
- virshUsage();
- exit(EXIT_SUCCESS);
- break;
- case 'k':
- if (virStrToLong_i(optarg, NULL, 0, &keepalive) < 0) {
- vshError(ctl,
- _("Invalid value for option %s"),
- longindex == -1 ? "-k" : "--keepalive-interval");
- exit(EXIT_FAILURE);
- }
+ /* GOptionContext doesn't support -- explicitly, but
+ * we told it to stop at first unknown option, or
+ * first non-option, so we'll see '--' and can discard it
+ */
+ if (argc >= 2 && STREQ(argv[1], "--")) {
+ argc--;
+ argv++;
+ }
- if (keepalive < 0) {
- vshError(ctl,
- _("option %s requires a positive integer argument"),
- longindex == -1 ? "-k" : "--keepalive-interval");
- exit(EXIT_FAILURE);
- }
- ctl->keepalive_interval = keepalive;
- break;
- case 'K':
- if (virStrToLong_i(optarg, NULL, 0, &keepalive) < 0) {
- vshError(ctl,
- _("Invalid value for option %s"),
- longindex == -1 ? "-K" : "--keepalive-count");
- exit(EXIT_FAILURE);
- }
+ if (debug < VSH_ERR_DEBUG || debug > VSH_ERR_ERROR) {
+ vshError(ctl, _("debug level %d out of range [%d-%d]"),
+ debug, VSH_ERR_DEBUG, VSH_ERR_ERROR);
+ exit(EXIT_FAILURE);
+ }
- if (keepalive < 0) {
- vshError(ctl,
- _("option %s requires a positive integer argument"),
- longindex == -1 ? "-K" : "--keepalive-count");
- exit(EXIT_FAILURE);
- }
- ctl->keepalive_count = keepalive;
- break;
- case 'l':
- vshCloseLogFile(ctl);
- ctl->logfile = vshStrdup(ctl, optarg);
- vshOpenLogFile(ctl);
- break;
- case 'q':
- ctl->quiet = true;
- break;
- case 't':
- ctl->timing = true;
- break;
- case 'r':
- priv->readonly = true;
- break;
- case 'v':
- if (STRNEQ_NULLABLE(optarg, "long")) {
- puts(VERSION);
- exit(EXIT_SUCCESS);
- }
- ATTRIBUTE_FALLTHROUGH;
- case 'V':
- virshShowVersion(ctl);
- exit(EXIT_SUCCESS);
- case ':':
- for (i = 0; opt[i].name != NULL; i++) {
- if (opt[i].val == optopt)
- break;
- }
- if (opt[i].name)
- vshError(ctl, _("option '-%c'/'--%s' requires an argument"),
- optopt, opt[i].name);
- else
- vshError(ctl, _("option '-%c' requires an argument"), optopt);
- exit(EXIT_FAILURE);
- case '?':
- if (optopt)
- vshError(ctl, _("unsupported option '-%c'. See --help."), optopt);
- else
- vshError(ctl, _("unsupported option '%s'. See --help."), argv[optind - 1]);
+ if (keepalive_interval != INT_MAX) {
+ if (keepalive_interval < 0) {
+ vshError(ctl,
+ _("keepalive interval requires a positive integer"));
exit(EXIT_FAILURE);
- default:
- vshError(ctl, _("unknown option"));
+ }
+ ctl->keepalive_interval = keepalive_interval;
+ }
+
+ if (keepalive_count != INT_MAX) {
+ if (keepalive_count < 0) {
+ vshError(ctl,
+ _("keepalive count requires a positive integer"));
exit(EXIT_FAILURE);
}
- longindex = -1;
+ ctl->keepalive_count = keepalive_count;
+ }
+
+ len = strlen(priv->escapeChar);
+ if (!((len == 2 && *priv->escapeChar == '^' &&
+ virshAllowedEscapeChar(priv->escapeChar[1])) ||
+ (len == 1 && *priv->escapeChar != '^'))) {
+ vshError(ctl, _("Invalid string '%s' for escape sequence"),
+ priv->escapeChar);
+ exit(EXIT_FAILURE);
+ }
+
+ if (logfile) {
+ vshCloseLogFile(ctl);
+ ctl->logfile = logfile;
+ vshOpenLogFile(ctl);
}
- if (argc == optind) {
+ if (argc == 1) {
ctl->imode = true;
} else {
/* parse command */
ctl->imode = false;
- if (argc - optind == 1) {
- vshDebug(ctl, VSH_ERR_INFO, "commands: \"%s\"\n", argv[optind]);
- return vshCommandStringParse(ctl, argv[optind], NULL);
+ if (argc == 2) {
+ vshDebug(ctl, VSH_ERR_INFO, "commands: \"%s\"\n", argv[1]);
+ return vshCommandStringParse(ctl, argv[1], NULL);
} else {
- return vshCommandArgvParse(ctl, argc - optind, argv + optind);
+ return vshCommandArgvParse(ctl, argc - 1, argv + 1);
}
}
return true;
--
2.21.0
--
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