When invoking pasta without any arguments, it's difficult
to tell whether we are in the new namespace or not leaving
users a bit confused. This change modifies the host namespace
to add a prefix "pasta-" to make it a bit more obvious.
Signed-off-by: Danish Prakash <contact(a)danishpraka.sh>
---
pasta.c | 13 +++++++++++++
1 file changed, 13 insertions(+)
diff --git a/pasta.c b/pasta.c
index 31e1e00..840a2b1 100644
--- a/pasta.c
+++ b/pasta.c
@@ -180,6 +180,8 @@ static int pasta_spawn_cmd(void *arg)
{
const struct pasta_spawn_cmd_arg *a;
sigset_t set;
+ char hostname[HOST_NAME_MAX+1], pasta_hostname[HOST_NAME_MAX+1];
+ char *hostname_prefix = "pasta-";
/* We run in a detached PID and mount namespace: mount /proc over */
if (mount("", "/proc", "proc", 0, NULL))
@@ -188,6 +190,17 @@ static int pasta_spawn_cmd(void *arg)
if (write_file("/proc/sys/net/ipv4/ping_group_range", "0 0"))
warn("Cannot set ping_group_range, ICMP requests might fail");
+ if (gethostname(hostname, HOST_NAME_MAX+1) == 0) {
+ if ((strlen(hostname) + strlen(hostname_prefix)) > HOST_NAME_MAX) {
+ hostname[strlen(hostname)-strlen(hostname_prefix)] = '\0';
+ }
+ sprintf(pasta_hostname, "%s%s", hostname_prefix, hostname);
+
+ if (sethostname(pasta_hostname, strlen(pasta_hostname)) != 0) {
+ warn("Unable to set pasta-prefixed hostname");
+ }
+ }
+
/* Wait for the parent to be ready: see main() */
sigemptyset(&set);
sigaddset(&set, SIGUSR1);
--
2.45.1