store: introduce _matchtrackedpath() and use it to filter store files
This patch introduces a function to filter store files on the basis of the path
which they are tracking.
The function assumes that the entries can be of two types, 'meta/*' and 'data/*'
which means it will just work on revlog based storage and not with another
storage ways.
For the 'data/*' entries, we remove the 'data/' part and '.i/.d' part from the
beginning and the end then pass that to matcher.
For the 'meta/*' entries, we remove the 'meta/' and '/00manifest.(i/d)' part from
beginning and end then call matcher.visitdir() with it to make sure all the
parent directories are also downloaded.
Since the storage filtering for narrow stream clones is implemented with this
patch, we remove the un-implemented error message, add some more tests and add
the treemanifest case to tests too.
The tests demonstrate that it works correctly.
After this patch, we have now narrow stream clones working. Narrow stream clones
are a very important feature for large repositories who have good internet
connection because they use streamclones for cloning and if they do normal
narrow clone, that takes more time then a full streamclone. Also narrow-stream
clone will drastically speed up clone timings.
Differential Revision: https://phab.mercurial-scm.org/D5139
#require unix-permissions no-root
$ hg init a
$ cd a
$ echo foo > b
$ hg add b
$ hg ci -m "b"
$ chmod -w .hg/store
$ cd ..
$ hg clone a b
requesting all changes
adding changesets
adding manifests
adding file changes
added 1 changesets with 1 changes to 1 files
new changesets 97310831fa1a
updating to branch default
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ chmod +w a/.hg/store # let test clean up
$ cd b
$ hg verify
checking changesets
checking manifests
crosschecking files in changesets and manifests
checking files
checked 1 changesets with 1 changes to 1 files
$ cd ..