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 specifi

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

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ln: Add a test case for ln -sfF.

MFC after: 1 week
Sponsored by: Klara, Inc.
Reviewed by: allanjude, asomers
Differential Revision: https://reviews.freebsd.org/D44513

ln: Clean up and simplify tests.

MFC after: 1 week
Sponsored by: Klara, Inc.
Reviewed by: allanjude
Differential Revision: https://reviews.freebsd.org/D44512

Remove $FreeBSD$: one-line sh pattern

Remove /^\s*#[#!]?\s*\$FreeBSD\$.*$\n/

Merge ^/head r319973 through 321382.

Merge ^/head r320042 through r320397.

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 after: 1 month
MFC with: r320172
PR: 219943
Differential Revision:

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 after: 1 month
MFC with: r320172
PR: 219943
Differential Revision: D11167
Submitted by: shivansh
Sponsored by: Google (GSoC 2017)

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Merge ^/head r319801 through r320041.

Style fixes: clean up leading whitespace (8 single column spaces -> \t)

MFC after: 1 month
MFC with: r319714, r319854, r319855, 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 d

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 after: 1 month
MFC with: r319714, r319854, r319855
PR: 219943
Reviewed by: ngie
Submitted by: shivansh
Differential Revision: D11159 (part of a larger diff)
Sponsored by: Google, Inc (GSoC 2017)

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Use readlink(1)/stat(1) to query symlinks instead of file(1)

file(1) can be compiled out of the system via MK_FILE == no, and the
output isn't guaranteed to be stable. It's better to use stat(1)/rea

Use readlink(1)/stat(1) to query symlinks instead of file(1)

file(1) can be compiled out of the system via MK_FILE == no, and the
output isn't guaranteed to be stable. It's better to use stat(1)/readlink(1)
instead to query symlink/file paths.

MFC after: 1 month
MFC with: r319714, r319854
Reported by: ngie
Submitted by: shivansh
Differential Revision: D11159 (part of a larger diff)
Sponsored by: Google, Inc (GSoC 2017)

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bin/ln: Set umask appropriately before creating files for testing

These changes were missed in D11084

Submitted by: shivansh
Reviewed by: asomers
MFC after: 1 month
X-MFC-With: 319714
Sponsored by:

bin/ln: Set umask appropriately before creating files for testing

These changes were missed in D11084

Submitted by: shivansh
Reviewed by: asomers
MFC after: 1 month
X-MFC-With: 319714
Sponsored by: Google, Inc (GSoC 2017)
Differential Revision: https://reviews.freebsd.org/D11158

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Merge ^/head r319548 through r319778.

Add tests for ln(1)

* Verify that when creating a hard link to a symbolic link, '-L' option
creates a hard link to the target of the symbolic link
* Verify that when creating a hard link to a symb

Add tests for ln(1)

* Verify that when creating a hard link to a symbolic link, '-L' option
creates a hard link to the target of the symbolic link
* Verify that when creating a hard link to a symbolic link, '-P' option
creates a hard link to the symbolic link itself
* Verify that if the target file already exists, '-f' option unlinks it so
that link may occur
* Verify that if the target file or directory is a symbolic link, '-shf'
option prevents following the link
* Verify that if the target file or directory is a symbolic link, '-snf'
option prevents following the link
* Verify that '-s' option creates a symbolic link
* Verify that '-w' option produces a warning if the source of a symbolic
link does not currently exist

Submitted by: shivansh
Reviewed by: asomers, ngie
MFC after: 1 month
Sponsored by: Google, Inc (GSoC 2017)
Differential Revision: https://reviews.freebsd.org/D11084

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