K 10
svn:author
V 3
jhb
K 8
svn:date
V 27
2021-06-16T20:24:17.993251Z
K 7
svn:log
V 619
etcupdate: Gracefully handle SIGINT when building trees.

Run the 'build_tree' function inside of a subshell and trap SIGINT to
return an error to the caller.  This allows callers to gracefully
cleanup a partially created tree.

While here, redirect stdout/stderr of the subshell to the log file
instead of applying redirections individually to each command executed
while building the tree.

Reviewed by:	imp
Differential Revision:	https://reviews.freebsd.org/D29844

(cherry picked from commit 1f7afa9364805a912270c9d6a70dc4a889d47a4e)

Git Hash:   29ed8efb3b1e834a5c6f4726fa2516a5af3266a9
Git Author: jhb@FreeBSD.org
END