MFC r319856,r320172,r320173:

r319856:

Add a testcase for `ln -sF`

The testcase fails today, so mark it with atf_expect_fail: in
particular, the target (B) isn't being unlinked and the documentation
doesn't suggest special handling for directories. Thus, there's either
a doc or an implementation bug in ln(1) that needs to be resolved.

MFC with:	r319714, r319854, r319855
PR:		219943

r320172:

ln(1): fix -F behavior

When '-F' option is used, the target directory needs to be unlinked.
Currently, the modified target ("target/source") is being unlinked, and
since it doesn't yet exist, the original target isn't removed.
This is fixed by skipping the block where target is modified to
"target/source" when '-F' option is set.
Hence, a symbolic link (with the same name as of the original target) to
the source_file is produced.

Update the test for ln(1) to reflect fix for option '-F'

PR:		219943

r320173:

Don't expect :sF_flag to fail anymore

While here, also add a check to verify that the link target
is updated in the testcase

MFC with:	r320172
PR:		219943

2 files changed, 20 insertions, 3 deletions

diff --git a/bin/ln/ln.c b/bin/ln/ln.c
index f50802a..ef8d532 100644
--- a/bin/ln/ln.c
+++ b/bin/ln/ln.c
@@ -245,11 +245,11 @@ linkit(const char *source, const char *target, int isdir)
 
 	/*
 	 * If the target is a directory (and not a symlink if hflag),
-	 * append the source's name.
+	 * append the source's name, unless Fflag is set.
 	 */
-	if (isdir ||
+	if (!Fflag && (isdir ||
 	    (lstat(target, &sb) == 0 && S_ISDIR(sb.st_mode)) ||
-	    (!hflag && stat(target, &sb) == 0 && S_ISDIR(sb.st_mode))) {
+	    (!hflag && stat(target, &sb) == 0 && S_ISDIR(sb.st_mode)))) {
 		if (strlcpy(bbuf, source, sizeof(bbuf)) >= sizeof(bbuf) ||
 		    (p = basename(bbuf)) == NULL ||
 		    snprintf(path, sizeof(path), "%s/%s", target, p) >=
diff --git a/bin/ln/tests/ln_test.sh b/bin/ln/tests/ln_test.sh
index f059f56..ad731f3 100644
--- a/bin/ln/tests/ln_test.sh
+++ b/bin/ln/tests/ln_test.sh
@@ -145,6 +145,22 @@ snf_flag_dir_body()
         atf_check -o inline:'C: symbolic link to B\n' file C
 }
 
+atf_test_case sF_flag
+sF_flag_head()
+{
+        atf_set "descr" "Verify that if the target file already exists " \
+                        "and is a directory, then '-sF' option removes " \
+                        "it so that the link may occur"
+}
+
+sF_flag_body()
+{
+	atf_check mkdir A B
+        atf_check ln -sF A B
+        atf_check -o inline:'Symbolic Link\n' stat -f %SHT B
+	atf_check -o inline:'A\n' readlink B
+}
+
 atf_test_case sf_flag
 sf_flag_head()
 {
@@ -210,6 +226,7 @@ atf_init_test_cases()
         atf_add_test_case target_exists_symbolic
         atf_add_test_case shf_flag_dir
         atf_add_test_case snf_flag_dir
+        atf_add_test_case sF_flag
         atf_add_test_case sf_flag
         atf_add_test_case s_flag
         atf_add_test_case s_flag_broken