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
Testing narrow clones when changesets modifying a matching file exist on
multiple branches
$ . "$TESTDIR/narrow-library.sh"
$ hg init master
$ cd master
$ cat >> .hg/hgrc <<EOF
> [narrow]
> serveellipses=True
> EOF
$ hg branch default
marked working directory as branch default
(branches are permanent and global, did you want a bookmark?)
$ for x in `$TESTDIR/seq.py 10`; do
> echo $x > "f$x"
> hg add "f$x"
> hg commit -m "Add $x"
> done
$ hg branch release-v1
marked working directory as branch release-v1
(branches are permanent and global, did you want a bookmark?)
$ hg commit -m "Start release for v1"
$ hg update default
0 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ for x in `$TESTDIR/seq.py 10`; do
> echo "$x v2" > "f$x"
> hg commit -m "Update $x to v2"
> done
$ hg update release-v1
10 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ hg branch release-v1
marked working directory as branch release-v1
$ for x in `$TESTDIR/seq.py 1 5`; do
> echo "$x v1 hotfix" > "f$x"
> hg commit -m "Hotfix $x in v1"
> done
$ hg update default
10 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ hg branch release-v2
marked working directory as branch release-v2
$ hg commit -m "Start release for v2"
$ hg update default
0 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ hg branch default
marked working directory as branch default
$ for x in `$TESTDIR/seq.py 10`; do
> echo "$x v3" > "f$x"
> hg commit -m "Update $x to v3"
> done
$ hg update release-v2
10 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ hg branch release-v2
marked working directory as branch release-v2
$ for x in `$TESTDIR/seq.py 4 9`; do
> echo "$x v2 hotfix" > "f$x"
> hg commit -m "Hotfix $x in v2"
> done
$ hg heads -T '{rev} <- {p1rev} ({branch}): {desc}\n'
42 <- 41 (release-v2): Hotfix 9 in v2
36 <- 35 (default): Update 10 to v3
25 <- 24 (release-v1): Hotfix 5 in v1
$ cd ..
We now have 3 branches: default, which has v3 of all files, release-v1 which
has v1 of all files, and release-v2 with v2 of all files.
Narrow clone which should get all branches
$ hg clone --narrow ssh://user@dummy/master narrow --include "f5"
requesting all changes
adding changesets
adding manifests
adding file changes
added 12 changesets with 5 changes to 1 files (+2 heads)
new changesets *:* (glob)
updating to branch default
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ cd narrow
$ hg log -G -T "{if(ellipsis, '...')}{node|short} ({branch}): {desc}\n"
o ...031f516143fe (release-v2): Hotfix 9 in v2
|
o 9cd7f7bb9ca1 (release-v2): Hotfix 5 in v2
|
o ...37bbc88f3ef0 (release-v2): Hotfix 4 in v2
|
| @ ...dae2f368ca07 (default): Update 10 to v3
| |
| o 9c224e89cb31 (default): Update 5 to v3
| |
| o ...04fb59c7c9dc (default): Update 4 to v3
|/
| o b2253e82401f (release-v1): Hotfix 5 in v1
| |
| o ...960ac37d74fd (release-v1): Hotfix 4 in v1
| |
o | 986298e3f347 (default): Update 5 to v2
| |
o | ...75d539c667ec (default): Update 4 to v2
|/
o 04c71bd5707f (default): Add 5
|
o ...881b3891d041 (default): Add 4
Narrow clone the first file, hitting edge condition where unaligned
changeset and manifest revnums cross branches.
$ hg clone --narrow ssh://user@dummy/master narrow --include "f1"
requesting all changes
adding changesets
adding manifests
adding file changes
added 10 changesets with 4 changes to 1 files (+2 heads)
new changesets *:* (glob)
updating to branch default
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ cd narrow
$ hg log -G -T "{if(ellipsis, '...')}{node|short} ({branch}): {desc}\n"
o ...031f516143fe (release-v2): Hotfix 9 in v2
|
| @ ...dae2f368ca07 (default): Update 10 to v3
| |
| o 1f5d184b8e96 (default): Update 1 to v3
|/
| o ...b2253e82401f (release-v1): Hotfix 5 in v1
| |
| o 133502f6b7e5 (release-v1): Hotfix 1 in v1
| |
o | ...79165c83d644 (default): Update 10 to v2
| |
o | c7b7a5f2f088 (default): Update 1 to v2
| |
| o ...f0531a3db7a9 (release-v1): Start release for v1
|/
o ...6a3f0f0abef3 (default): Add 10
|
o e012ac15eaaa (default): Add 1