file writable name
Returns 1 if file name is writable by the current user, 0 otherwise.
RS just noticed that from Windows 2000 over network boundaries, it may report 1 even for directories where I positively may not write. A hacky workaround seems to be:
set dummyname $name.[clock seconds] ;# not to clobber an existing one
if { [catch {file open $dummyname w]} fp] } {
# not writable
} else {
close $fp
file delete $dummyname
}EL I confirms this, and regrettably notice that the converse is also true: 0 is being returned where I do have permission to write. I'd even extend Richard's hack to:
rename file _file
proc file {args} {
if {[lindex $args 1] eq "writable"} {
set dirName [lindex $args 2]
if {[file isdir $dirName]} {
set fileName [file join $dirName dummy.[clock seconds]]
if {[catch {open $fileName w} fp]} {
# not writable
return 0
} else {
close $fp
file delete $fileName
return 1
}
} else {
eval _file $args
}
} else {
eval _file $args
}
}Vince adds --- 'NativeAccess' in tclWinFile.c needs updating to deal with Windows user/permission-related information (whatever that is -- anyone have any pointers?).
EL would TWAPI be of use here?
See also:
Tcl syntax help - Category Command - Category Introspection - Category File