--keep-hostname part 3 (#7048)

src/firejail/usage.c

@@ -134,6 +134,7 @@ static const char *const usage_str =
 	"    --keep-dev-shm - /dev/shm directory is untouched (even with --private-dev).\n"
 	"    --keep-dev-tpm - /dev/tpm* devices are untouched (even with --private-dev).\n"
 	"    --keep-fd - inherit open file descriptors to sandbox.\n"
+	"    --keep-hostname - use the current hostname\n"
 	"    --keep-shell-rc - do not copy shell rc files from /etc/skel\n"
 	"    --keep-var-tmp - /var/tmp directory is untouched.\n"
 #ifdef HAVE_LANDLOCK

src/man/firejail-profile.5.in

@@ -914,6 +914,11 @@ Set a DNS server for the sandbox. Up to three DNS servers can be defined.
 \fBhostname name
 Set a hostname for the sandbox.
 
+.TP
+\fBkeep\-hostname
+By default, the hostname is replaced by a random name generated
+by firejail at startup. Use this option to disable this feature.
+
 .TP
 \fBhosts\-file file
 Use file as /etc/hosts.

src/man/firejail.1.in

@@ -1313,6 +1313,18 @@ Example:
 .br
 $ firejail \-\-keep\-fd=3,4,5
 
+.TP
+\fB\-\-keep\-hostname
+By default, the hostname is replaced by a random name generated by firejail
+at startup. Use this option to disable this feature.
+.br
+
+.br
+Example:
+.br
+$ firejail \-\-keep\-hostname
+.br
+
 .TP
 \fB\-\-keep\-shell\-rc
 By default, when using a private home directory, firejail copies files from the