[Devel] Re: [PATCH lxc 1/2] lxc-unshare: accept multiple -s options

[Serge E. Hallyn]

Quoting Daniel Lezcano (dlezcano at fr.ibm.com):
> On 05/13/2010 09:34 PM, Serge E. Hallyn wrote:
> >(also remove -f from usage as it is not actually supported)
> >
> >Signed-off-by: Serge E. Hallyn<serue at us.ibm.com>
> >---
> >  src/lxc/lxc_unshare.c |   28 ++++++++++++++++++++++++++--
> >  1 files changed, 26 insertions(+), 2 deletions(-)
> >
> >diff --git a/src/lxc/lxc_unshare.c b/src/lxc/lxc_unshare.c
> >index 10654f7..8db1cb7 100644
> >--- a/src/lxc/lxc_unshare.c
> >+++ b/src/lxc/lxc_unshare.c
> >@@ -48,7 +48,7 @@ void usage(char *cmd)
> >  	fprintf(stderr, "\t -s flags: Ored list of flags to unshare:\n" \
> >  			"\t           MOUNT, PID, UTSNAME, IPC, USER, NETWORK\n");
> >  	fprintf(stderr, "\t -u<id>  : new id to be set if -s USER is specified\n");
> >-	fprintf(stderr, "\t if -f or -s PID is specified,<command>  is mandatory)\n");
> >+	fprintf(stderr, "\t if -s PID is specified,<command>  is mandatory)\n");
> >  	_exit(1);
> >  }
> >
> >@@ -154,6 +154,29 @@ static int do_start(void *arg)
> >  	return 1;
> >  }
> >
> >+void extend_namespaces(char **n, char *optarg)
> >+{
> >+	char *namespaces = *n;
> >+	int cont = 0, newlen = strlen(optarg) + 1; /* +1 for trailing \0 */
> >+
> >+	if (namespaces) {
> >+		cont = 1;
> >+		newlen += strlen(namespaces) + 1; /* +1 for '|' */
> >+	}
> >+
> >+	namespaces = realloc(namespaces, newlen);
> >+	if (!namespaces) {
> >+		perror("realloc");
> >+		exit(1);
> >+	}
> >+	if (cont)
> >+		sprintf(namespaces+strlen(namespaces), "|%s", optarg);
> >+	else
> >+		sprintf(namespaces, "%s", optarg);
> >+	namespaces[newlen-1] = '\0';
> >+	*n = namespaces;
> >+}
> >+
> >  int main(int argc, char *argv[])
> >  {
> >  	int opt, status;
> >@@ -174,7 +197,8 @@ int main(int argc, char *argv[])
> >  	while ((opt = getopt(argc, argv, "s:u:")) != -1) {
> >  		switch (opt) {
> >  		case 's':
> >-			namespaces = optarg;
> >+			extend_namespaces(&namespaces, optarg);
> >+			printf("namespaces is %s\n", namespaces);
> >  			break;
> >  		case 'u':
> >  			uid = lookup_user(optarg);
> 
> Hi Serge,
> 
> Sorry for the delay.
> 
> Is it possible to just kill the "Ored" option format and have only
> multiple "-s" options ? That will simplificate the code a lot.

Agreed I think that'd be better

-serge
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