snacktime said:
I'm trying to figure out why a particular system command is returning
false on windows.
This works fine and returns true:
res = system('dir')
This returns false with $? being nil:
res = system('rake')
if I just run rake at the command line it works fine. I'm sure this
is something simple, but windows is not a development environment I am
used to.
Try cmd=ExecCmd.new("rake");puts cmd.success?;puts cmd.output using the
class at the end of this message (Ara's solution for grabbing the output
of stderr and stdout on windows with a broken popen3 was better -
giving you separate stderr und stdout - but this one has benchmarking
too
).
I get
false
rake aborted!
No Rakefile found (looking for: rakefile, Rakefile, rakefile.rb,
Rakefile.rb)
d:/dev/ruby/lib/ruby/gems/1.8/gems/rake-0.6.2/lib/rake.rb:1373:in
`load_rakefile'
on a directory without a rakefile, which is correct
.
system("rake") for the same directory gives a $? of 256.
--------
class ExecCmd
attr_reader
utput,:cmd,:exec_time
#When a block is given, the command runs before yielding
def initialize cmd
@cmd=cmd
@cmd_run=cmd+" 2>&1" unless cmd=~/2>&1/
if block_given?
run
yield self
end
end
#Runs the command
def run
t1=Time.now
IO.popen(@cmd_run){|f|
@output=f.read
@process=Process.waitpid2(f.pid)[1]
}
@exec_time=Time.now-t1
end
#Returns false if the command hasn't been executed yet
def run?
return false unless @process
return true
end
#Returns the exit code for the command. Runs the command if it hasn't
run yet.
def exitcode
run unless @process
@process.exitstatus
end
#Returns true if the command was succesfull.
#
#Will return false if the command hasn't been executed
def success?
return @process.success? if @process
return false
end
end
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