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Arrière
# -- tcl -- # ### ### ### ######### ######### ######### ## Overview # Heuristics to assemble a platform identifier from publicly available # information. The identifier describes the platform of the currently # running tcl shell. This is a mixture of the runtime environment and # of build-time properties of the executable itself. # # Examples: # <1> A tcl shell executing on a x86_64 processor, but having a # wordsize of 4 was compiled for the x86 environment, i.e. 32 # bit, and loaded packages have to match that, and not the # actual cpu. # # <2> The hp/solaris 32/64 bit builds of the core cannot be # distinguished by looking at tcl_platform. As packages have to # match the 32/64 information we have to look in more places. In # this case we inspect the executable itself (magic numbers, # i.e. fileutil::magic::filetype). # # The basic information used comes out of the 'os' and 'machine' # entries of the 'tcl_platform' array. A number of general and # os/machine specific transformation are applied to get a canonical # result. # # General # Only the first element of 'os' is used - we don't care whether we # are on "Windows NT" or "Windows XP" or whatever. # # Machine specific # % arm* -> arm # % sun4* -> sparc # % intel -> ix86 # % i86 -> ix86 # % Power* -> powerpc # % x86_64 + wordSize 4 => x86 code # # OS specific # % AIX are always powerpc machines # % HP-UX 9000/800 etc means parisc # % linux has to take glibc version into account # % sunos -> solaris, and keep version number # # NOTE: A platform like linux glibc 2.3, which can use glibc 2.2 stuff # has to provide all possible allowed platform identifiers when # searching search. Ditto a solaris 2.8 platform can use solaris 2.6 # packages. Etc. This is handled by the other procedure, see below. # ### ### ### ######### ######### ######### ## Requirements namespace eval ::platform {} # ### ### ### ######### ######### ######### ## Implementation # -- platform::generic # # Assembles an identifier for the generic platform. It leaves out # details like kernel version, libc version, etc. proc ::platform::generic {} { global tcl_platform set plat [string tolower [lindex $tcl_platform(os) 0]] set cpu $tcl_platform(machine) switch -glob -- $cpu { sun4* { set cpu sparc } intel - i86 { set cpu ix86 } x86_64 { if {$tcl_platform(wordSize) == 4} { # See Example <1> at the top of this file. set cpu ix86 } } "Power" { set cpu powerpc } "arm" { set cpu arm } ia64 { if {$tcl_platform(wordSize) == 4} { append cpu _32 } } } switch -glob -- $plat { cygwin* { set plat cygwin } windows { if {$tcl_platform(platform) == "unix"} { set plat cygwin } else { set plat win32 } if {$cpu eq "amd64"} { # Do not check wordSize, win32-x64 is an IL32P64 platform. set cpu x86_64 } } sunos { set plat solaris if {[string match "ix86" $cpu]} { if {$tcl_platform(wordSize) == 8} { set cpu x86_64 } } elseif {![string match "ia64" $cpu]} { # sparc if {$tcl_platform(wordSize) == 8} { append cpu 64 } } } darwin { set plat macosx # Correctly identify the cpu when running as a 64bit # process on a machine with a 32bit kernel if {$cpu eq "ix86"} { if {$tcl_platform(wordSize) == 8} { set cpu x86_64 } } } aix { set cpu powerpc if {$tcl_platform(wordSize) == 8} { append cpu 64 } } hp-ux { set plat hpux if {![string match "ia64" $cpu]} { set cpu parisc if {$tcl_platform(wordSize) == 8} { append cpu 64 } } } osf1 { set plat tru64 } } return "${plat}-${cpu}" } # -- platform::identify # # Assembles an identifier for the exact platform, by extending the # generic identifier. I.e. it adds in details like kernel version, # libc version, etc., if they are relevant for the loading of # packages on the platform. proc ::platform::identify {} { global tcl_platform set id [generic] regexp {^([^-]+)-([^-]+)$} $id -> plat cpu switch -- $plat { solaris { regsub {^5} $tcl_platform(osVersion) 2 text append plat $text return "${plat}-${cpu}" } macosx { set major [lindex [split $tcl_platform(osVersion) .] 0] if {$major > 8} { incr major -4 append plat 10.$major return "${plat}-${cpu}" } } linux { # Look for the libc.so and determine its version # (libc5/6, libc6 further glibc 2.X) set v unknown # Determine in which directory to look. /lib, or /lib64. # For that we use the tcl_platform(wordSize). # # We could use the 'cpu' info, per the equivalence below, # that however would be restricted to intel. And this may # be a arm, mips, etc. system. The wordsize is more # fundamental. # # ix86 <=> (wordSize == 4) <=> 32 bit ==> /lib # x86_64 <=> (wordSize == 8) <=> 64 bit ==> /lib64 # # Do not look into /lib64 even if present, if the cpu # doesn't fit. # TODO: Determine the prefixes (i386, x86_64, ...) for # other cpus. The path after the generic one is utterly # specific to intel right now. Ok, on Ubuntu, possibly # other Debian systems we may apparently be able to query # the necessary CPU code. If we can't we simply use the # hardwired fallback. switch -exact -- $tcl_platform(wordSize) { 4 { lappend bases /lib if {[catch { exec dpkg-architecture -qDEB_HOST_MULTIARCH } res]} { lappend bases /lib/i386-linux-gnu } else { # dpkg-arch returns the full tripled, not just cpu. lappend bases /lib/$res } } 8 { lappend bases /lib64 if {[catch { exec dpkg-architecture -qDEB_HOST_MULTIARCH } res]} { lappend bases /lib/x86_64-linux-gnu } else { # dpkg-arch returns the full tripled, not just cpu. lappend bases /lib/$res } } default { return -code error "Bad wordSize $tcl_platform(wordSize), expected 4 or 8" } } foreach base $bases { if {[LibcVersion $base -> v]} break } append plat -$v return "${plat}-${cpu}" } } return $id } proc ::platform::LibcVersion {base _->_ vv} { upvar 1 $vv v set libclist [lsort [glob -nocomplain -directory $base libc]] if {![llength $libclist]} { return 0 } set libc [lindex $libclist 0] # Try executing the library first. This should suceed # for a glibc library, and return the version # information. if {![catch { set vdata [lindex [split [exec $libc] \n] 0] }]} { regexp {version ([0-9]+(\.[0-9]+))} $vdata -> v foreach {major minor} [split $v .] break set v glibc${major}.${minor} return 1 } else { # We had trouble executing the library. We are now # inspecting its name to determine the version # number. This code by Larry McVoy. if {[regexp -- {libc-([0-9]+)\.([0-9]+)} $libc -> major minor]} { set v glibc${major}.${minor} return 1 } } return 0 } # -- platform::patterns # # Given an exact platform identifier, i.e. _not_ the generic # identifier it assembles a list of exact platform identifier # describing platform which should be compatible with the # input. # # I.e. packages for all platforms in the result list should be # loadable on the specified platform. # << Should we add the generic identifier to the list as well ? In # general it is not compatible I believe. So better not. In many # cases the exact identifier is identical to the generic one # anyway. # >> proc ::platform::patterns {id} { set res [list $id] if {$id eq "tcl"} {return $res} switch -glob -- $id { solaris-* { if {[regexp {solaris([^-])-(.)} $id -> v cpu]} { if {$v eq ""} {return $id} foreach {major minor} [split $v .] break incr minor -1 for {set j $minor} {$j >= 6} {incr j -1} { lappend res solaris${major}.${j}-${cpu} } } } linux- { if {[regexp {linux-glibc([^-])-(.)} $id -> v cpu]} { foreach {major minor} [split $v .] break incr minor -1 for {set j $minor} {$j >= 0} {incr j -1} { lappend res linux-glibc${major}.${j}-${cpu} } } } macosx-powerpc { lappend res macosx-universal } macosx-x86_64 { lappend res macosx-i386-x86_64 } macosx-ix86 { lappend res macosx-universal macosx-i386-x86_64 } macosx- { # 10.5+ if {[regexp {macosx([^-])-(.)} $id -> v cpu]} { switch -exact -- $cpu { ix86 { lappend alt i386-x86_64 lappend alt universal } x86_64 { lappend alt i386-x86_64 } default { set alt {} } } if {$v ne ""} { foreach {major minor} [split $v .] break # Add 10.5 to 10.minor to patterns. set res {} for {set j $minor} {$j >= 5} {incr j -1} { lappend res macosx${major}.${j}-${cpu} foreach a $alt { lappend res macosx${major}.${j}-$a } } # Add unversioned patterns for 10.3/10.4 builds. lappend res macosx-${cpu} foreach a $alt { lappend res macosx-$a } } else { # No version, just do unversioned patterns. foreach a $alt { lappend res macosx-$a } } } else { # no v, no cpu ... nothing } } } lappend res tcl ; # Pure tcl packages are always compatible. return $res } # ### ### ### ######### ######### ######### ## Ready package provide platform 1.0.14 # ### ### ### ######### ######### ######### ## Demo application if {[info exists argv0] && ($argv0 eq [info script])} { puts ==================================== parray tcl_platform puts ==================================== puts Generic\ identification:\ [::platform::generic] puts Exact\ identification:\ \ \ [::platform::identify] puts ==================================== puts Search\ patterns: puts \ [join [::platform::patterns [::platform::identify]] \n\ ] puts ==================================== exit 0 }