/usr/share/tcltk/tcl8.4/platform/shell.tcl is in libtcl8.4 8.4.20-7.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 | # -*- 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 pre-existing 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 pre-existing 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, whereever 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 != ""} {
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
|