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sim: allow forward dependencies in checkpoint upgraders

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The notion of forward dependencies is just expressing the same
dependency but at the other end of the dependency edge, i.e. at
the dependee rather than the depender.  As there is no more
'power' here, it's strictly a convenience feature for handling
dependencies with tags that are not in the upstream repository.

Change-Id: Ic7c68de6aff4094aaa12de62cdf690a5dc65ccb5
Reviewed-by: Andreas Sandberg <andreas.sandberg@arm.com>
This commit is contained in:
Curtis Dunham 2017-02-14 15:09:18 -06:00
parent 72e74aed0a
commit 5638a074b9
1 changed files with 36 additions and 0 deletions
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36
util/cpt_upgrader.py
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@ -64,6 +64,14 @@
# its upgrader (or downgrader) can run. It is still the case that a tag
# can only be used once.
# Dependencies between tags are expressed by two variables at the top-level
# of the upgrader script: "depends" can be either a string naming another
# tag that it depends upon or a list of such strings; and "fwd_depends"
# accepts the same datatypes but it reverses the sense of the dependency
# arrow(s) -- it expresses that that tag depends upon the tag of the current
# upgrader. This can be especially valuable when maintaining private
# upgraders in private branches.
import ConfigParser
import glob, types, sys, os
@ -94,6 +102,20 @@ class Upgrader:
elif isinstance(self.depends, str):
self.depends = [self.depends]
if not isinstance(self.depends, list):
print "Error: 'depends' for %s is the wrong type" % self.tag
sys.exit(1)
if hasattr(self, 'fwd_depends'):
if isinstance(self.fwd_depends, str):
self.fwd_depends = [self.fwd_depends]
else:
self.fwd_depends = []
if not isinstance(self.fwd_depends, list):
print "Error: 'fwd_depends' for %s is the wrong type" % self.tag
sys.exit(1)
if hasattr(self, 'upgrader'):
if not isinstance(self.upgrader, types.FunctionType):
print "Error: 'upgrader' for %s is %s, not function" \
@ -148,6 +170,20 @@ class Upgrader:
Upgrader.legacy[i].depends = [Upgrader.legacy[i-1].tag]
i = i + 1
# resolve forward dependencies and audit normal dependencies
for tag, upg in Upgrader.by_tag.items():
for fd in upg.fwd_depends:
if fd not in Upgrader.by_tag:
print "Error: '%s' cannot (forward) depend on "\
"nonexistent tag '%s'" % (fd, tag)
sys.exit(1)
Upgrader.by_tag[fd].depends.append(tag)
for dep in upg.depends:
if dep not in Upgrader.by_tag:
print "Error: '%s' cannot depend on "\
"nonexistent tag '%s'" % (tag, dep)
sys.exit(1)
def process_file(path, **kwargs):
if not osp.isfile(path):
import errno