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ln: Improve link(1) variant of ln(1).
* Give link(1) its own usage message.
* Use getprogname(3) instead of rolling our own.
* Verify that the target file does not already exist.
* Add tests specific to link(1).
MFC after: 3 days
Sponsored by: Klara, Inc.
Reviewed by: allanjude
Differential Revision: https://reviews.freebsd.org/D44635
(cherry picked from commit bee7cf9e97)
This commit is contained in:
Dag-Erling Smørgrav
parent
39d543db53
commit
dc0087a3aa
36
bin/ln/ln.c
36
bin/ln/ln.c
@ -67,13 +67,14 @@ static bool wflag; /* Warn if symlink target does not
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static char linkch;
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static int linkit(const char *, const char *, bool);
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static void link_usage(void) __dead2;
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static void usage(void) __dead2;
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int
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main(int argc, char *argv[])
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{
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struct stat sb;
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char *p, *targetdir;
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char *targetdir;
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int ch, exitval;
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/*
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@ -81,17 +82,20 @@ main(int argc, char *argv[])
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* "link", for which the functionality provided is greatly
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* simplified.
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*/
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if ((p = strrchr(argv[0], '/')) == NULL)
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p = argv[0];
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else
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++p;
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if (strcmp(p, "link") == 0) {
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if (strcmp(getprogname(), "link") == 0) {
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while (getopt(argc, argv, "") != -1)
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usage();
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link_usage();
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argc -= optind;
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argv += optind;
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if (argc != 2)
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usage();
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link_usage();
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if (lstat(argv[1], &sb) == 0)
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errc(1, EEXIST, "%s", argv[1]);
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/*
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* We could simply call link(2) here, but linkit()
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* performs additional checks and gives better
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* diagnostics.
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*/
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exit(linkit(argv[0], argv[1], false));
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}
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@ -350,11 +354,17 @@ linkit(const char *source, const char *target, bool isdir)
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}
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static void
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usage(void)
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link_usage(void)
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{
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(void)fprintf(stderr, "%s\n%s\n%s\n",
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"usage: ln [-s [-F] | -L | -P] [-f | -i] [-hnv] source_file [target_file]",
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" ln [-s [-F] | -L | -P] [-f | -i] [-hnv] source_file ... target_dir",
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" link source_file target_file");
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(void)fprintf(stderr, "usage: link source_file target_file\n");
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exit(1);
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}
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static void
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usage(void)
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{
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(void)fprintf(stderr, "%s\n%s\n",
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"usage: ln [-s [-F] | -L | -P] [-f | -i] [-hnv] source_file [target_file]",
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" ln [-s [-F] | -L | -P] [-f | -i] [-hnv] source_file ... target_dir");
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exit(1);
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}
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@ -90,7 +90,7 @@ target_exists_hard_body()
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{
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atf_check touch A B
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atf_check -s exit:1 -e inline:'ln: B: File exists\n' \
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ln A B
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ln A B
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}
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atf_test_case target_exists_symbolic
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@ -103,7 +103,7 @@ target_exists_symbolic_body()
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{
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atf_check touch A B
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atf_check -s exit:1 -e inline:'ln: B: File exists\n' \
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ln -s A B
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ln -s A B
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}
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atf_test_case shf_flag_dir
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@ -210,10 +210,65 @@ sw_flag_head()
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sw_flag_body()
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{
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atf_check -s exit:0 -e inline:'ln: warning: A: No such file or directory\n' \
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ln -sw A B
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ln -sw A B
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atf_check_symlink_to A B
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}
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atf_test_case link_argc
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link_argc_head() {
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atf_set "descr" "Verify that link(1) requires exactly two arguments"
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}
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link_argc_body() {
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atf_check -s exit:1 -e match:"usage: link" \
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link foo
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atf_check -s exit:1 -e match:"No such file" \
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link foo bar
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atf_check -s exit:1 -e match:"No such file" \
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link -- foo bar
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atf_check -s exit:1 -e match:"usage: link" \
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link foo bar baz
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}
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atf_test_case link_basic
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link_basic_head() {
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atf_set "descr" "Verify that link(1) creates a link"
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}
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link_basic_body() {
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touch foo
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atf_check link foo bar
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atf_check_same_file foo bar
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rm bar
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ln -s foo bar
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atf_check link bar baz
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atf_check_same_file foo baz
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}
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atf_test_case link_eexist
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link_eexist_head() {
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atf_set "descr" "Verify that link(1) fails if the target exists"
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}
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link_eexist_body() {
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touch foo bar
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atf_check -s exit:1 -e match:"bar.*exists" \
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link foo bar
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ln -s non-existent baz
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atf_check -s exit:1 -e match:"baz.*exists" \
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link foo baz
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}
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atf_test_case link_eisdir
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link_eisdir_head() {
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atf_set "descr" "Verify that link(1) fails if the source is a directory"
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}
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link_eisdir_body() {
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mkdir foo
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atf_check -s exit:1 -e match:"foo.*directory" \
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link foo bar
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ln -s foo bar
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atf_check -s exit:1 -e match:"bar.*directory" \
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link bar baz
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}
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atf_init_test_cases()
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{
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atf_add_test_case L_flag
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@ -229,4 +284,8 @@ atf_init_test_cases()
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atf_add_test_case s_flag
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atf_add_test_case s_flag_broken
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atf_add_test_case sw_flag
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atf_add_test_case link_argc
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atf_add_test_case link_basic
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atf_add_test_case link_eexist
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atf_add_test_case link_eisdir
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}
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