commit f4b9b966cf67aecd551dc2daa2398727a76ab1c1
parent 61f5d4887aa62c67d0888992adfe0eafe834d030
Author: Michael Forney <mforney@mforney.org>
Date: Sat, 21 Dec 2019 21:08:36 -0800
cp: Default to -P when -R is specified
POSIX only specifies the -H, -L, and -P options for use with -R, and
the default is left to the implementation. Without -R, symlinks must
be followed.
Most implementations use -P as the default with -R, which makes sense
to me as default behavior (the source and destination trees are the same).
Since we use the same code for -R and without it, and we allow -H, -L,
and -P without -R, set the default based on the presence of -R. Without
it, use -L as before, as required by POSIX, and with it, use -P to match
the behavior of other implementations.
Diffstat:
3 files changed, 8 insertions(+), 2 deletions(-)
diff --git a/cp.1 b/cp.1
@@ -48,9 +48,12 @@ Dereference
if it is a symbolic link.
.It Fl L
Dereference all symbolic links.
-This is the default.
+This is the default without
+.Fl R .
.It Fl P
Preserve symbolic links.
+This is the default with
+.Fl R .
.It Fl R
Traverse directories recursively. If this flag is not specified, directories
are not copied.
diff --git a/cp.c b/cp.c
@@ -45,6 +45,9 @@ main(int argc, char *argv[])
if (argc < 2)
usage();
+ if (!cp_follow)
+ cp_follow = cp_rflag ? 'P' : 'L';
+
if (argc > 2) {
if (stat(argv[argc - 1], &st) < 0)
eprintf("stat %s:", argv[argc - 1]);
diff --git a/libutil/cp.c b/libutil/cp.c
@@ -20,7 +20,7 @@ int cp_pflag = 0;
int cp_rflag = 0;
int cp_vflag = 0;
int cp_status = 0;
-int cp_follow = 'L';
+int cp_follow;
int
cp(const char *s1, const char *s2, int depth)
