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path/filepath: make Rel handle Windows UNC share
Fixes #41230 Change-Id: Iea15e4ae6d56328333fd22de5d78dfcad78ef1bc Reviewed-on: https://go-review.googlesource.com/c/go/+/253197 Reviewed-by: Alex Brainman <alex.brainman@gmail.com> Trust: Alex Brainman <alex.brainman@gmail.com> Trust: Emmanuel Odeke <emmanuel@orijtech.com> Run-TryBot: Alex Brainman <alex.brainman@gmail.com> TryBot-Result: Go Bot <gobot@golang.org>
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@ -275,7 +275,11 @@ func Rel(basepath, targpath string) (string, error) {
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targ = targ[len(targVol):]
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if base == "." {
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base = ""
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} else if base == "" && volumeNameLen(baseVol) > 2 /* isUNC */ {
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// Treat any targetpath matching `\\host\share` basepath as absolute path.
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base = string(Separator)
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}
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// Can't use IsAbs - `\a` and `a` are both relative in Windows.
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baseSlashed := len(base) > 0 && base[0] == Separator
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targSlashed := len(targ) > 0 && targ[0] == Separator
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@ -1227,6 +1227,7 @@ var winreltests = []RelTests{
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{`C:\Projects`, `c:\projects\src`, `src`},
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{`C:\Projects`, `c:\projects`, `.`},
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{`C:\Projects\a\..`, `c:\projects`, `.`},
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{`\\host\share`, `\\host\share\file.txt`, `file.txt`},
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}
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func TestRel(t *testing.T) {
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