dirstate-tree: Add tree traversal/iteration
Like Python’s, Rust’s iterators are "external" in that they are driven
by a caller who calls a `next` method. This is as opposed to "internal"
iterators who drive themselves and call a callback for each item.
Writing an internal iterator traversing a tree is easy with recursion,
but internal iterators cannot rely on the call stack in that way,
they must save in an explicit object all state that they need to be
preserved across two `next` calls.
This algorithm uses a `Vec` as a stack that contains what would be
local variables on the call stack if we could use recursion.
Differential Revision: https://phab.mercurial-scm.org/D10370
hide outer repo
$ hg init
$ echo "[extensions]" >> $HGRCPATH
$ echo "mq=" >> $HGRCPATH
$ mkdir webdir
$ cd webdir
$ hg init a
$ hg --cwd a qinit -c
$ echo a > a/a
$ hg --cwd a ci -A -m a
adding a
$ echo b > a/b
$ hg --cwd a addremove
adding b
$ hg --cwd a qnew -f b.patch
$ hg --cwd a qcommit -m b.patch
$ hg --cwd a log --template "{desc}\n"
[mq]: b.patch
a
$ hg --cwd a/.hg/patches log --template "{desc}\n"
b.patch
$ root=`pwd`
$ cd ..
test with recursive collection
$ cat > collections.conf <<EOF
> [paths]
> /=$root/**
> EOF
$ hg serve -p $HGPORT -d --pid-file=hg.pid --webdir-conf collections.conf \
> -A access-paths.log -E error-paths-1.log
$ cat hg.pid >> $DAEMON_PIDS
$ get-with-headers.py localhost:$HGPORT '?style=raw'
200 Script output follows
/a/
/a/.hg/patches/
$ hg qclone http://localhost:$HGPORT/a b
requesting all changes
adding changesets
adding manifests
adding file changes
added 2 changesets with 2 changes to 2 files
new changesets cb9a9f314b8b:184916345baa
requesting all changes
adding changesets
adding manifests
adding file changes
added 1 changesets with 3 changes to 3 files
new changesets 4052ceaa8c4e
updating to branch default
3 files updated, 0 files merged, 0 files removed, 0 files unresolved
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ hg --cwd b log --template "{desc}\n"
a
$ hg --cwd b qpush -a
applying b.patch
now at: b.patch
$ hg --cwd b log --template "{desc}\n"
imported patch b.patch
a
test with normal collection
$ cat > collections1.conf <<EOF
> [paths]
> /=$root/*
> EOF
$ hg serve -p $HGPORT1 -d --pid-file=hg.pid --webdir-conf collections1.conf \
> -A access-paths.log -E error-paths-1.log
$ cat hg.pid >> $DAEMON_PIDS
$ get-with-headers.py localhost:$HGPORT1 '?style=raw'
200 Script output follows
/a/
/a/.hg/patches/
$ hg qclone http://localhost:$HGPORT1/a c
requesting all changes
adding changesets
adding manifests
adding file changes
added 2 changesets with 2 changes to 2 files
new changesets cb9a9f314b8b:184916345baa
requesting all changes
adding changesets
adding manifests
adding file changes
added 1 changesets with 3 changes to 3 files
new changesets 4052ceaa8c4e
updating to branch default
3 files updated, 0 files merged, 0 files removed, 0 files unresolved
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ hg --cwd c log --template "{desc}\n"
a
$ hg --cwd c qpush -a
applying b.patch
now at: b.patch
$ hg --cwd c log --template "{desc}\n"
imported patch b.patch
a
test with old-style collection
$ cat > collections2.conf <<EOF
> [collections]
> $root=$root
> EOF
$ hg serve -p $HGPORT2 -d --pid-file=hg.pid --webdir-conf collections2.conf \
> -A access-paths.log -E error-paths-1.log
$ cat hg.pid >> $DAEMON_PIDS
$ get-with-headers.py localhost:$HGPORT2 '?style=raw'
200 Script output follows
/a/
/a/.hg/patches/
$ hg qclone http://localhost:$HGPORT2/a d
requesting all changes
adding changesets
adding manifests
adding file changes
added 2 changesets with 2 changes to 2 files
new changesets cb9a9f314b8b:184916345baa
requesting all changes
adding changesets
adding manifests
adding file changes
added 1 changesets with 3 changes to 3 files
new changesets 4052ceaa8c4e
updating to branch default
3 files updated, 0 files merged, 0 files removed, 0 files unresolved
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ hg --cwd d log --template "{desc}\n"
a
$ hg --cwd d qpush -a
applying b.patch
now at: b.patch
$ hg --cwd d log --template "{desc}\n"
imported patch b.patch
a
test --mq works and uses correct repository config
$ hg --cwd d outgoing --mq
comparing with http://localhost:$HGPORT2/a/.hg/patches
searching for changes
no changes found
[1]
$ hg --cwd d log --mq --template '{rev} {desc|firstline}\n'
0 b.patch
$ killdaemons.py