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authorMartin Pitt <martin.pitt@ubuntu.com>2016-06-26 17:46:23 +0200
committerGitHub <noreply@github.com>2016-06-26 17:46:23 +0200
commitbed48d665599fca9ac44f3bb330087c80edb01c7 (patch)
tree4f0a962d5369af14834d47119dbf68196447fa9e /src
parent4b930ded8391c7552820f8f162b4e6ceebf50ca4 (diff)
parent5b566d2475abf9ee6806e898639984529fe6f4ae (diff)
Merge pull request #3572 from poettering/machinectl-shell-fix
machinectl: interpret options placed between "shell" verb and machine name
Diffstat (limited to 'src')
-rw-r--r--src/machine/machinectl.c78
1 files changed, 62 insertions, 16 deletions
diff --git a/src/machine/machinectl.c b/src/machine/machinectl.c
index b47d2a832a..843e678eca 100644
--- a/src/machine/machinectl.c
+++ b/src/machine/machinectl.c
@@ -2579,35 +2579,65 @@ static int parse_argv(int argc, char *argv[]) {
};
bool reorder = false;
- int c, r;
+ int c, r, shell = -1;
assert(argc >= 0);
assert(argv);
for (;;) {
- const char * const option_string = "+hp:als:H:M:qn:o:";
+ static const char option_string[] = "-hp:als:H:M:qn:o:";
c = getopt_long(argc, argv, option_string + reorder, options, NULL);
- if (c < 0) {
+ if (c < 0)
+ break;
+
+ switch (c) {
+
+ case 1: /* getopt_long() returns 1 if "-" was the first character of the option string, and a
+ * non-option argument was discovered. */
+
+ assert(!reorder);
+
/* We generally are fine with the fact that getopt_long() reorders the command line, and looks
* for switches after the main verb. However, for "shell" we really don't want that, since we
- * want that switches passed after that are passed to the program to execute, and not processed
- * by us. To make this possible, we'll first invoke getopt_long() with reordering disabled
- * (i.e. with the "+" prefix in the option string), and as soon as we hit the end (i.e. the
- * verb) we check if that's "shell". If it is, we exit the loop, since we don't want any
- * further options processed. However, if it is anything else, we process the same argument
- * again, but this time allow reordering. */
-
- if (!reorder && optind < argc && !streq(argv[optind], "shell")) {
+ * want that switches specified after the machine name are passed to the program to execute,
+ * and not processed by us. To make this possible, we'll first invoke getopt_long() with
+ * reordering disabled (i.e. with the "-" prefix in the option string), looking for the first
+ * non-option parameter. If it's the verb "shell" we remember its position and continue
+ * processing options. In this case, as soon as we hit the next non-option argument we found
+ * the machine name, and stop further processing. If the first non-option argument is any other
+ * verb than "shell" we switch to normal reordering mode and continue processing arguments
+ * normally. */
+
+ if (shell >= 0) {
+ /* If we already found the "shell" verb on the command line, and now found the next
+ * non-option argument, then this is the machine name and we should stop processing
+ * further arguments. */
+ optind --; /* don't process this argument, go one step back */
+ goto done;
+ }
+ if (streq(optarg, "shell"))
+ /* Remember the position of the "shell" verb, and continue processing normally. */
+ shell = optind - 1;
+ else {
+ int saved_optind;
+
+ /* OK, this is some other verb. In this case, turn on reordering again, and continue
+ * processing normally. */
reorder = true;
- optind--;
- continue;
+
+ /* We changed the option string. getopt_long() only looks at it again if we invoke it
+ * at least once with a reset option index. Hence, let's reset the option index here,
+ * then invoke getopt_long() again (ignoring what it has to say, after all we most
+ * likely already processed it), and the bump the option index so that we read the
+ * intended argument again. */
+ saved_optind = optind;
+ optind = 0;
+ (void) getopt_long(argc, argv, option_string + reorder, options, NULL);
+ optind = saved_optind - 1; /* go one step back, process this argument again */
}
break;
- }
-
- switch (c) {
case 'h':
return help(0, NULL, NULL);
@@ -2743,6 +2773,22 @@ static int parse_argv(int argc, char *argv[]) {
}
}
+done:
+ if (shell >= 0) {
+ char *t;
+ int i;
+
+ /* We found the "shell" verb while processing the argument list. Since we turned off reordering of the
+ * argument list initially let's readjust it now, and move the "shell" verb to the back. */
+
+ optind -= 1; /* place the option index where the "shell" verb will be placed */
+
+ t = argv[shell];
+ for (i = shell; i < optind; i++)
+ argv[i] = argv[i+1];
+ argv[optind] = t;
+ }
+
return 1;
}