Add SRC_UPDATE_SKIP, DOC_UPDATE_SKIP, and PORTS_UPDATE_SKIP

variables.  These are intended to allow bypassing the
'svn co /usr/{src,doc,ports}' step in the chroot when the
tree exists from external means.

The use case here is that /usr/src, /usr/doc, and /usr/ports
in the chroot exist as result of zfs dataset clones, so it
is possible (and happens quite often) that the included
distributions may not be consistent.  (This is not the case
for -RELEASE builds, but does happen for snapshot builds.)

Tested on:	stable/9@r264319
MFC After:	3 days
Sponsored by:	The FreeBSD Foundation

1 files changed, 12 insertions, 0 deletions

diff --git a/release/release.conf.sample b/release/release.conf.sample
index e7b9933bb3c3b..66f0cf99cfd8d 100644
--- a/release/release.conf.sample
+++ b/release/release.conf.sample
@@ -56,6 +56,18 @@ PORTBRANCH="ports/head@rHEAD"
 ## means.
 #CHROOTBUILD_SKIP=
 
+## Set to a non-empty value skip checkout or update of /usr/src in
+## the chroot.  This is intended for use when /usr/src already exists.
+#SRC_UPDATE_SKIP=
+
+## Set to a non-empty value skip checkout or update of /usr/doc in
+## the chroot.  This is intended for use when /usr/doc already exists.
+#DOC_UPDATE_SKIP=
+
+## Set to a non-empty value skip checkout or update of /usr/ports in
+## the chroot.  This is intended for use when /usr/ports already exists.
+#PORTS_UPDATE_SKIP=
+
 ## Set to pass additional flags to make(1) for the build chroot setup, such
 ## as TARGET/TARGET_ARCH.
 #CHROOT_MAKEENV=