misc/alt-revdep-pax: alternative approache to ELF exec <-> library mappings

1 files changed, 101 insertions, 0 deletions

diff --git a/misc/alt-revdep-pax b/misc/alt-revdep-pax
new file mode 100755
index 0000000..a9445a1
--- /dev/null
+++ b/misc/alt-revdep-pax
@@ -0,0 +1,101 @@
+#!/usr/bin/env python
+
+#
+# Note: This alternative way of doing revdep-pax only
+# works on Gentoo systems where NEEDED.ELF.2 all the
+# information we need generated by scanelf during emerge.
+#
+# See /usr/lib/portage/bin/misc-functions.sh ~line 520
+# echo "${arch:3};${obj};${soname};${rpath};${needed}" >> "${PORTAGE_BUILDDIR}"/build-info/NEEDED.ELF.2
+#
+
+import os
+import re
+import pax
+
+def get_forward_linkings():
+	var_db_pkg = '/var/db/pkg'
+
+	forward_linkings = {}
+	for cat in os.listdir(var_db_pkg):
+		catdir = '%s/%s' % (var_db_pkg, cat)
+		for pkg in os.listdir(catdir):
+			pkgdir = '%s/%s' % (catdir, pkg)
+			need = '%s/%s' % (pkgdir, 'NEEDED.ELF.2')
+			try:
+				g = open(need, 'r')
+				needs = g.readlines()
+				for line in needs:
+					line = line.strip()
+					link = re.split(';', line)
+					elf = link[1]
+					sonames = re.split(',', link[4])
+					forward_linkings[elf] = sonames
+			except IOError:
+				continue #File probably doesn't exist, which is okay
+
+	return forward_linkings
+
+
+def get_library_mappings():
+	var_db_pkg = '/var/db/pkg'
+
+	library2soname_mappings = {}
+	soname2library_mappings = {}
+
+	for cat in os.listdir(var_db_pkg):
+		catdir = '%s/%s' % (var_db_pkg, cat)
+		for pkg in os.listdir(catdir):
+			pkgdir = '%s/%s' % (catdir, pkg)
+			need = '%s/%s' % (pkgdir, 'NEEDED.ELF.2')
+			try:
+				g = open(need, 'r')
+				needs = g.readlines()
+				for line in needs:
+					line = line.strip()
+					link = re.split(';', line)
+					elf = link[1]
+					soname = link[2]
+					if soname:
+						library2soname_mappings[elf] = soname
+						soname2library_mappings[soname] = elf
+			except IOError:
+				continue #File probably doesn't exist, which is okay
+
+	return ( library2soname_mappings, soname2library_mappings )
+
+def main():
+	forward_linkings = get_forward_linkings()
+	( library2soname_mappings, soname2library_mappings ) = get_library_mappings()
+
+	for elf in forward_linkings:
+		try:
+			flags = pax.getflags(elf)[0]
+			if flags:
+				print("%s %s" % (flags, elf))
+			else:
+				print("NONE: %s" % elf)
+		except pax.error:
+			print("BUSY: %s" % elf)
+
+	"""
+	for soname in sorted(soname2library_mappings):
+		elf = soname2library_mappings[soname]
+		print("%s : %s" % ( soname, elf ))
+	"""
+
+	"""	
+	for elf in forward_linkings:
+		sonames = forward_linkings[elf]
+		print("%s" % elf)
+		for soname in sorted(forward_linkings[elf]):
+			try:
+				print("\t%s\t=> %s" % (soname, soname2library_mappings[soname]))
+			except KeyError as e:
+				print("\t%s\t=> ****" % soname)
+		print("\n\n")
+	"""
+
+
+if __name__ == '__main__':
+	main()