cp -p . <existing-directory> creates leading component #8555
Description
As of commit 4af2a84 (Aug 13):
Expected:
jak@jak-t14-g3 ~/P/U/S/adequate-0.17.5> mkdir /tmp/foo
jak@jak-t14-g3 ~/P/U/S/adequate-0.17.5> gnucp -ap . /tmp/foo
jak@jak-t14-g3 ~/P/U/S/adequate-0.17.5> ls /tmp/foo
CONTRIB.md apt.go copyright.go fs.go pkgconfdeps.go templates/
adequate.go apt_test.go debconf.go go.mod private/ testdata/
adequate_test.go binfmt.go debian/ ids.go pyfile.go tests/
alternatives.go binfmt_test.go doc/ ids_test.go strutils.go
alternatives_test.go conffile.go elf.go namecollision.go symlink.go
apt.conf.d/ conffile_test.go exec.go packagefile.go tags.go
Observed
jak@jak-t14-g3 ~/P/U/S/adequate-0.17.5> rm -r /tmp/foo
jak@jak-t14-g3 ~/P/U/S/adequate-0.17.5> mkdir /tmp/foo
jak@jak-t14-g3 ~/P/U/S/adequate-0.17.5> cp -ap . /tmp/foo
jak@jak-t14-g3 ~/P/U/S/adequate-0.17.5> ls /tmp/foo
adequate-0.17.5/
OTOH, if target does not exist:
jak@jak-t14-g3 ~/P/U/S/adequate-0.17.5> rm -r /tmp/foo
jak@jak-t14-g3 ~/P/U/S/adequate-0.17.5> cp -ap . /tmp/foo
jak@jak-t14-g3 ~/P/U/S/adequate-0.17.5> ls /tmp/foo
CONTRIB.md apt.go copyright.go fs.go pkgconfdeps.go templates/
adequate.go apt_test.go debconf.go go.mod private/ testdata/
adequate_test.go binfmt.go debian/ ids.go pyfile.go tests/
alternatives.go binfmt_test.go doc/ ids_test.go strutils.go
alternatives_test.go conffile.go elf.go namecollision.go symlink.go
apt.conf.d/ conffile_test.go exec.go packagefile.go tags.go