Rename function to be shorter

debian/changelog

@@ -1,3 +1,12 @@
+livecd-rootfs (2.689) UNRELEASED; urgency=medium
+
+    [ Patrick Viafore ]
+  * Replace archive.ubuntu.com and security.ubuntu.com with launchpad
+    mirrors. This is only done inside a build context, and the original
+    sources.list file is restored at the end of the build
+
+ -- Patrick Viafore <patrick.viafore@canonical.com>  Mon, 21 Sep 2020 12:08:11 -0500
+
 livecd-rootfs (2.688) groovy; urgency=medium
 
   * ubuntu-cpc: Fix spelling in vagrant file

live-build/functions

@@ -87,7 +87,7 @@ mount_image() {
     return 0
 }
 
-setup_sourceslist_to_use_lb_parent_mirror_chroot(){
+use_lp_archives_in_sourceslist(){
     # Use the build environment apt mirror during the build,
     # for both archive and security.
     # live-build does this in the chroot (lb_chroot_archives)
@@ -145,7 +145,7 @@ setup_mountpoint() {
     cp /etc/resolv.conf "$mountpoint/etc/resolv.conf"
     mv "$mountpoint/etc/nsswitch.conf" nsswitch.conf.tmp
     sed 's/systemd//g' nsswitch.conf.tmp > "$mountpoint/etc/nsswitch.conf"
-    setup_sourceslist_to_use_lb_parent_mirror_chroot "${mountpoint}"
+    use_lp_archives_in_sourceslist "${mountpoint}"
     chroot "$mountpoint" apt-get update
 
 }