Control: reopen -1 On Fri, 2014-02-21 at 11:07:38 +0100, Eugen Dedu wrote: > On 20/02/14 21:38, Guillem Jover wrote: > >On Thu, 2014-02-20 at 18:23:59 +0100, Eugen Dedu wrote: > >>I need to use dir_to_symlink and see in 'man dpkg-maintscript-helper': > >> > >>"[...] we can call the program only if we know that the required > >>command is supported by the currently installed dpkg: > >> if dpkg-maintscript-helper supports command; then > >> dpkg-maintscript-helper command ... > >> fi > >>" > >> > >>On my computer dpkg-maintscript-helper supports always returns 1: > >> > >>snoopy:~$ dpkg-maintscript-helper supports dir_to_symlink; echo $? > >>dpkg-maintscript-helper: warning: environment variable > >>DPKG_MAINTSCRIPT_NAME missing > >>dpkg-maintscript-helper: warning: environment variable > >>DPKG_MAINTSCRIPT_PACKAGE missing > >>1 > >>snoopy:~$ dpkg-maintscript-helper supports fasdfa; echo $? > >>dpkg-maintscript-helper: warning: environment variable > >>DPKG_MAINTSCRIPT_NAME missing > >>dpkg-maintscript-helper: warning: environment variable > >>DPKG_MAINTSCRIPT_PACKAGE missing > >>1 > >>snoopy:~$ dpkg-maintscript-helper supports xyz; echo $? > >>dpkg-maintscript-helper: warning: environment variable > >>DPKG_MAINTSCRIPT_NAME missing > >>dpkg-maintscript-helper: warning: environment variable > >>DPKG_MAINTSCRIPT_PACKAGE missing > >>1 > > > >Tha's because the mentioned variables are not defined in the > >environment, as dpkg does. Check this instead: > > > > $ env DPKG_MAINTSCRIPT_NAME=postinst DPKG_MAINTSCRIPT_PACKAGE=pkg \ > > dpkg-maintscript-helper supports dir_to_symlink > > $ echo $? > > 0 > > > >I'm thus closing this bug report. > > May I suggest to add this information on the man page? I think it > is not evident to see that the program might give different results > depending on the environment variables. (By the way, I myself do > not see why it gives different results.)
Ok, I'm adding that explicitly, although it's implicitly already there, when mentioning the environment variables and given that the program is a maintscript helper, but I guess it might not be obvious. If gives different results, because if those envvars are not defined then the commands will always fail, which is the equivalent of not supporting them. Thanks, Guillem -- To UNSUBSCRIBE, email to debian-bugs-dist-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org
