On Thu, Feb 13, 2014 at 03:10:41PM +0100, Pino Toscano wrote:
In Debian/Ubuntu systems, read the previous hostname from /etc/hostname before replacing it, and replace it in /etc/hosts with the new hostname. --- mllib/hostname.ml | 30 ++++++++++++++++++++++++++++++ 1 file changed, 30 insertions(+)
diff --git a/mllib/hostname.ml b/mllib/hostname.ml index fce16ff..70ca934 100644 --- a/mllib/hostname.ml +++ b/mllib/hostname.ml @@ -42,7 +42,12 @@ let rec set_hostname (g : Guestfs.guestfs) root hostname = true
| "linux", ("debian"|"ubuntu"), _ -> + let old_hostname = read_etc_hostname g in update_etc_hostname g hostname; + (match old_hostname with + | Some old_hostname -> replace_host_in_etc_hosts g old_hostname hostname + | None -> () + ); true
| "linux", ("fedora"|"rhel"|"centos"|"scientificlinux"|"redhat-based"), _ -> @@ -78,3 +83,28 @@ and update_etc_hostname g hostname =
and update_etc_machine_info g hostname = replace_line_in_file g "/etc/machine-info" "PRETTY_HOSTNAME" hostname + +and read_etc_hostname g = + let filename = "/etc/hostname" in + if g#is_file filename then ( + let lines = Array.to_list (g#read_lines filename) in + match lines with + | hd :: _ -> Some hd + | [] -> None + ) else + None + +and replace_host_in_etc_hosts g oldhost newhost = + if g#is_file "/etc/hosts" then ( + let expr = "/files/etc/hosts/*[label() != '#comment']/*[label() != 'ipaddr']" in + g#aug_init "/" 0; + let matches = Array.to_list (g#aug_match expr) in + List.iter ( + fun m -> + let value = g#aug_get m in + if value = oldhost then ( + g#aug_set m newhost + ) + ) matches; + g#aug_save () + )
Yup, third time lucky :-) ACK. Rich. -- Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones virt-top is 'top' for virtual machines. Tiny program with many powerful monitoring features, net stats, disk stats, logging, etc. http://people.redhat.com/~rjones/virt-top