Bug #202068 - In order to filter unwanted variable assignments out

of the bash environment, use a filter-bash-environment.py script
that behaves similar to egrep -v except that it leaves bash here-
documents intact.

svn path=/main/trunk/; revision=8892

diff --git a/bin/ebuild.sh b/bin/ebuild.sh
index 45437bc2d6cc18295f4583c26f9c65fb00934390..5e09daa695d645e080f94f1609748c9cd145b18e 100755 (executable)
--- a/bin/ebuild.sh
+++ b/bin/ebuild.sh
@@ -1425,7 +1425,7 @@ filter_readonly_variables() {
        # listed in READONLY_EBUILD_METADATA, since having any readonly attributes
        # persisting in the saved environment can be inconvenient when it
        # eventually needs to be reloaded.
-       egrep -v -e "${var_grep}" | sed \
+       "${PORTAGE_BIN_PATH}"/filter-bash-environment.py "${var_grep}" | sed \
                -e 's:^declare[[:space:]]\+-r[[:space:]]\+:declare :' \
                -e 's:^declare[[:space:]]\+-\([[:alnum:]]*\)r\([[:alnum:]]*\)[[:space:]]\+:declare -\1\2 :'
 }

diff --git a/bin/filter-bash-environment.py b/bin/filter-bash-environment.py
new file mode 100755 (executable)
index 0000000..83b250b
--- /dev/null
+++ b/bin/filter-bash-environment.py
@@ -0,0 +1,52 @@
+#!/usr/bin/env python
+# Copyright 1999-2007 Gentoo Foundation
+# Distributed under the terms of the GNU General Public License v2
+# $Id$
+
+import os, re, sys
+
+egrep_compat_map = {
+       "[:alnum:]" : r'\w',
+       "[:space:]" : r'\s',
+}
+
+here_doc_re = re.compile(r'.*\s<<[-]?(\w+)$')
+
+def compile_egrep_pattern(s):
+       for k, v in egrep_compat_map.iteritems():
+               s = s.replace(k, v)
+       return re.compile(s)
+
+def filter_bash_environment(pattern, file_in, file_out):
+       here_doc_delim = None
+       for line in file_in:
+               if here_doc_delim is not None:
+                       if here_doc_delim.match(line):
+                               here_doc_delim = None
+                       file_out.write(line)
+                       continue
+               here_doc = here_doc_re.match(line)
+               if here_doc is not None:
+                       here_doc_delim = re.compile("^%s$" % here_doc.group(1))
+                       file_out.write(line)
+                       continue
+               if pattern.match(line) is None:
+                       file_out.write(line)
+
+if __name__ == "__main__":
+       description = "Filter out any lines that match a given PATTERN " + \
+               "while leaving bash here-documents intact. The PATTERN should " + \
+               "use python regular expression syntax but [:space:] and " + \
+               "[:alnum:] character classes will be automatically translated " + \
+               "for compatibility with egrep syntax."
+       usage = "usage: %s PATTERN" % os.path.basename(sys.argv[0])
+       from optparse import OptionParser
+       parser = OptionParser(description=description, usage=usage)
+       options, args = parser.parse_args(sys.argv[1:])
+       if len(args) != 1:
+               parser.error("Missing required PATTERN argument.")
+       file_in = sys.stdin
+       file_out = sys.stdout
+       filter_bash_environment(
+               compile_egrep_pattern(args[0]), file_in, file_out)
+       file_out.flush()