Teach walk code about absolute paths. The first consequence of this is that absolute and relative paths now all work in the same way. The second is that paths that lie outside the repository now cause an error to be reported, instead of something arbitrary and expensive being done. Internally, all of the serious work is in the util package. The new canonpath function takes an arbitrary path and either returns a canonical path or raises an error. Because it needs to know where the repository root is, it must be fed a repository or dirstate object, which has given commands.matchpats and friends a new parameter to pass along. The util.matcher function uses this to canonicalise globs and relative path names. Meanwhile, I've moved the Abort exception from commands to util, and killed off the redundant util.CommandError exception.

+ hg init
+ hg add a
+ hg commit -m 1 -d 0 0
+ hg status
+ hg copy a b
+ hg status
A b
+ hg --debug commit -m 2 -d 0 0
b
 b: copy a:b789fdd96dc2f3bd229c1dd8eedf0fc60e2b68e3
+ hg history
changeset:   1:3b5b84850bbe
tag:         tip
user:        test
date:        Thu Jan  1 00:00:00 1970
summary:     2

changeset:   0:c19d34741b0a
user:        test
date:        Thu Jan  1 00:00:00 1970
summary:     1

+ hg log a
changeset:   0:c19d34741b0a
user:        test
date:        Thu Jan  1 00:00:00 1970
summary:     1

566e338d09a089ba737c21e0d3759980  .hg/data/b.d
3268d2f51b2d2d423ff01b59eb6fbb14  bsum
70909ca2ecf494c71e9184b445e040ee  asum
+ hg verify
checking changesets
checking manifests
crosschecking files in changesets and manifests
checking files
2 files, 2 changesets, 2 total revisions