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2014-11-09pull: Use the build procedure provided by the newly-downloaded Guix....Fixes <http://bugs.gnu.org/18534>. * guix/scripts/pull.scm (with-environment-variable, with-PATH): New macros. (temporary-directory, first-directory, interned-then-deleted): New procedures. (unpack): Rewrite to do the unpacking in the current process rather than as a separate derivation. (%self-build-file): New variable. (build-from-source): New procedure. (build-and-install): Use it. * guix/build/pull.scm (build-guix): Rename 'tarball' argument to 'source'. Remove #:tar and #:gzip parameters, as well as 'tar' invocation. Remove 'scandir' invocation. Wrap body in 'with-directory-excursion'. * build-aux/build-self.scm: New file. * Makefile.am (EXTRA_DIST): Add it. Ludovic Courtès