branchcache: add a "pure topological head" fast path
In a narrow but actually quick common case, all topological heads are all on
the same branch and all open. In this case, computing the branch map is very
simple. We can quickly detect situation where this situation will not change.
So we update the V3 format to be able to express this situation and upgrade the
update code to detect we remains in that mode.
The branch cache is populated with the actual value when the branch map is
accessed, but the update_disk method can do the update without needing to
populate it.
Testing cloning with the EOL extension
$ cat >> $HGRCPATH <<EOF
> [extensions]
> eol =
>
> [eol]
> native = CRLF
> EOF
setup repository
$ hg init repo
$ cd repo
$ cat > .hgeol <<EOF
> [patterns]
> **.txt = native
> EOF
$ printf "first\r\nsecond\r\nthird\r\n" > a.txt
$ hg commit --addremove -m 'checkin'
adding .hgeol
adding a.txt
Test commit of removed .hgeol and how it immediately makes the automatic
changes explicit and committable.
$ cd ..
$ hg clone repo repo-2
updating to branch default
2 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ cd repo-2
$ cat a.txt
first\r (esc)
second\r (esc)
third\r (esc)
$ hg cat a.txt
first
second
third
$ hg remove .hgeol
$ touch a.txt * # ensure consistent st dirtyness checks, ignoring dirstate timing
$ hg st -v --debug
M a.txt
R .hgeol
$ hg commit -m 'remove eol'
$ hg exp
# HG changeset patch
# User test
# Date 0 0
# Thu Jan 01 00:00:00 1970 +0000
# Node ID 3c20c2d90333b6ecdc8f7aa8f9b73223c7c7a608
# Parent 90f94e2cf4e24628afddd641688dfe4cd476d6e4
remove eol
diff -r 90f94e2cf4e2 -r 3c20c2d90333 .hgeol
--- a/.hgeol Thu Jan 01 00:00:00 1970 +0000
+++ /dev/null Thu Jan 01 00:00:00 1970 +0000
@@ -1,2 +0,0 @@
-[patterns]
-**.txt = native
diff -r 90f94e2cf4e2 -r 3c20c2d90333 a.txt
--- a/a.txt Thu Jan 01 00:00:00 1970 +0000
+++ b/a.txt Thu Jan 01 00:00:00 1970 +0000
@@ -1,3 +1,3 @@
-first
-second
-third
+first\r (esc)
+second\r (esc)
+third\r (esc)
$ hg push --quiet
$ cd ..
Test clone of repo with .hgeol in working dir, but no .hgeol in default
checkout revision tip. The repo is correctly updated to be consistent and have
the exact content checked out without filtering, ignoring the current .hgeol in
the source repo:
$ cat repo/.hgeol
[patterns]
**.txt = native
$ hg clone repo repo-3 -v --debug
linked 8 files (no-rust !)
linked 10 files (rust !)
updating to branch default
resolving manifests
branchmerge: False, force: False, partial: False
ancestor: 000000000000, local: 000000000000+, remote: 3c20c2d90333
calling hook preupdate.eol: hgext.eol.preupdate
a.txt: remote created -> g
getting a.txt
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
updating the branch cache
$ cd repo-3
$ cat a.txt
first\r (esc)
second\r (esc)
third\r (esc)
Test clone of revision with .hgeol
$ cd ..
$ hg clone -r 0 repo repo-4
adding changesets
adding manifests
adding file changes
added 1 changesets with 2 changes to 2 files
new changesets 90f94e2cf4e2
updating to branch default
2 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ cd repo-4
$ cat .hgeol
[patterns]
**.txt = native
$ cat a.txt
first\r (esc)
second\r (esc)
third\r (esc)
$ cd ..