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# -*- tcl -*- # ### ### ### ######### ######### ######### ## Overview # Higher-level commands which invoke the functionality of this package # for an arbitrary tcl shell (tclsh, wish, ...). This is required by a # repository as while the tcl shell executing packages uses the same # platform in general as a repository application there can be # differences in detail (i.e. 32/64 bit builds). # ### ### ### ######### ######### ######### ## Requirements package require platform namespace eval ::platform::shell {} # ### ### ### ######### ######### ######### ## Implementation # -- platform::shell::generic proc ::platform::shell::generic {shell} { # Argument is the path to a tcl shell. CHECK $shell LOCATE base out set code {} # Forget any preexisting platform package, it might be in # conflict with this one. lappend code {package forget platform} # Inject our platform package lappend code [list source $base] # Query and print the architecture lappend code {puts [platform::generic]} # And done lappend code {exit 0} set arch [RUN $shell [join $code \n]] if {$out} {file delete -force $base} return $arch } # -- platform::shell::identify proc ::platform::shell::identify {shell} { # Argument is the path to a tcl shell. CHECK $shell LOCATE base out set code {} # Forget any preexisting platform package, it might be in # conflict with this one. lappend code {package forget platform} # Inject our platform package lappend code [list source $base] # Query and print the architecture lappend code {puts [platform::identify]} # And done lappend code {exit 0} set arch [RUN $shell [join $code \n]] if {$out} {file delete -force $base} return $arch } # -- platform::shell::platform proc ::platform::shell::platform {shell} { # Argument is the path to a tcl shell. CHECK $shell set code {} lappend code {puts $tcl_platform(platform)} lappend code {exit 0} return [RUN $shell [join $code \n]] } # ### ### ### ######### ######### ######### ## Internal helper commands. proc ::platform::shell::CHECK {shell} { if {![file exists $shell]} { return -code error "Shell \"$shell\" does not exist" } if {![file executable $shell]} { return -code error "Shell \"$shell\" is not executable (permissions)" } return } proc ::platform::shell::LOCATE {bv ov} { upvar 1 $bv base $ov out # Locate the platform package for injection into the specified # shell. We are using package management to find it, wherever it # is, instead of using hardwired relative paths. This allows us to # install the two packages as TMs without breaking the code # here. If the found package is wrapped we copy the code somewhere # where the spawned shell will be able to read it. # This code is brittle, it needs has to adapt to whatever changes # are made to the TM code, i.e. the "provide" statement generated by # tm.tcl set pl [package ifneeded platform [package require platform]] set base [lindex $pl end] set out 0 if {[lindex [file system $base]] ne "native"} { set temp [TEMP] file copy -force $base $temp set base $temp set out 1 } return } proc ::platform::shell::RUN {shell code} { set c [TEMP] set cc [open $c w] puts $cc $code close $cc set e [TEMP] set code [catch { exec $shell $c 2> $e } res] file delete $c if {$code} { append res \n[read [set chan [open $e r]]][close $chan] file delete $e return -code error "Shell \"$shell\" is not executable ($res)" } file delete $e return $res } proc ::platform::shell::TEMP {} { set prefix platform # This code is copied out of Tcllib's fileutil package. # (TempFile/tempfile) set tmpdir [DIR] set chars "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789" set nrand_chars 10 set maxtries 10 set access [list RDWR CREAT EXCL TRUNC] set permission 0600 set channel "" set checked_dir_writable 0 set mypid [pid] for {set i 0} {$i < $maxtries} {incr i} { set newname $prefix for {set j 0} {$j < $nrand_chars} {incr j} { append newname [string index $chars \ [expr {int(rand()*62)}]] } set newname [file join $tmpdir $newname] if {[file exists $newname]} { after 1 } else { if {[catch {open $newname $access $permission} channel]} { if {!$checked_dir_writable} { set dirname [file dirname $newname] if {![file writable $dirname]} { return -code error "Directory $dirname is not writable" } set checked_dir_writable 1 } } else { # Success close $channel return [file normalize $newname] } } } if {$channel ne ""} { return -code error "Failed to open a temporary file: $channel" } else { return -code error "Failed to find an unused temporary file name" } } proc ::platform::shell::DIR {} { # This code is copied out of Tcllib's fileutil package. # (TempDir/tempdir) global tcl_platform env set attempdirs [list] foreach tmp {TMPDIR TEMP TMP} { if { [info exists env($tmp)] } { lappend attempdirs $env($tmp) } } switch $tcl_platform(platform) { windows { lappend attempdirs "C:\\TEMP" "C:\\TMP" "\\TEMP" "\\TMP" } macintosh { set tmpdir $env(TRASH_FOLDER) ;# a better place? } default { lappend attempdirs \ [file join / tmp] \ [file join / var tmp] \ [file join / usr tmp] } } lappend attempdirs [pwd] foreach tmp $attempdirs { if { [file isdirectory $tmp] && [file writable $tmp] } { return [file normalize $tmp] } } # Fail if nothing worked. return -code error "Unable to determine a proper directory for temporary files" } # ### ### ### ######### ######### ######### ## Ready package provide platform::shell 1.1.4
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