[Bug 235438] cp -R command not working properly

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=235438

--- Comment #4 from commit-hook@FreeBSD.org ---
A commit in branch stable/12 references this bug:

URL:
https://cgit.FreeBSD.org/src/commit/?id=b57954717ddfe52be9e18591d302c61e50db0aa6

commit b57954717ddfe52be9e18591d302c61e50db0aa6
Author:     Kyle Evans <kevans@FreeBSD.org>
AuthorDate: 2022-01-27 18:02:17 +0000
Commit:     Kyle Evans <kevans@FreeBSD.org>
CommitDate: 2022-04-24 03:48:56 +0000

    cp: fix some cases with infinite recursion

    As noted in the PR, cp -R has some surprising behavior.  Typically, when
    you `cp -R foo bar` where both foo and bar exist, foo is cleanly copied
    to foo/bar.  When you `cp -R foo foo` (where foo clearly exists), cp(1)
    goes a little off the rails as it creates foo/foo, then discovers that
    and creates foo/foo/foo, so on and so forth, until it eventually fails.

    POSIX doesn't seem to disallow this behavior, but it isn't very useful.
    GNU cp(1) will detect the recursion and squash it, but emit a message in
    the process that it has done so.

    This change seemingly follows the GNU behavior, but it currently doesn't
    warn about the situation -- the author feels that the final product is
    about what one might expect from doing this and thus, doesn't need a
    warning.  The author doesn't feel strongly about this.

    PR:             235438
    Reviewed by:    bapt
    Sponsored by:   Klara, Inc.

    (cherry picked from commit 848263aad129c8f9de75b58a5ab9a010611b75ac)

 bin/cp/cp.c             | 75 +++++++++++++++++++++++++++++++++++++++++++----
 bin/cp/tests/cp_test.sh | 77 +++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 147 insertions(+), 5 deletions(-)

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