nodemap: introduce append-only incremental update of the persistent data
Rewriting the full nodemap for each transaction has a cost we would like to
avoid. We introduce a new way to write persistent nodemap data by adding new
information at the end for file. Any new and updated block as added at the end
of the file. The last block is the new root node.
With this method, some of the block already on disk get "dereferenced" and
become dead data. In later changesets, We'll start tracking the amount of dead
data to eventually re-generate a full nodemap.
Differential Revision: https://phab.mercurial-scm.org/D7886
Path conflict checking is currently disabled by default because of issue5716.
Turn it on for this test.
$ cat >> $HGRCPATH << EOF
> [experimental]
> merge.checkpathconflicts=True
> EOF
$ hg init repo
$ cd repo
$ echo base > base
$ hg add base
$ hg commit -m "base"
$ hg bookmark -i base
$ mkdir a
$ echo 1 > a/b
$ hg add a/b
$ hg commit -m "file"
$ hg bookmark -i file
$ echo 2 > a/b
$ hg commit -m "file2"
$ hg bookmark -i file2
$ hg up 0
0 files updated, 0 files merged, 1 files removed, 0 files unresolved
$ mkdir a
#if symlink
$ ln -s c a/b
#else
$ touch a/b
#endif
$ hg add a/b
$ hg commit -m "link"
created new head
$ hg bookmark -i link
$ hg up 0
0 files updated, 0 files merged, 1 files removed, 0 files unresolved
$ mkdir -p a/b/c
$ echo 2 > a/b/c/d
$ hg add a/b/c/d
$ hg commit -m "dir"
created new head
$ hg bookmark -i dir
Update - local file conflicts with remote directory:
$ hg up -q 0
$ mkdir a
$ echo 9 > a/b
$ hg up dir
a/b: untracked file conflicts with directory
abort: untracked files in working directory differ from files in requested revision
[255]
$ hg up dir --config merge.checkunknown=warn
a/b: replacing untracked file
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
(activating bookmark dir)
$ cat a/b.orig
9
$ rm a/b.orig
Update - local symlink conflicts with remote directory:
$ hg up -q 0
$ mkdir a
#if symlink
$ ln -s x a/b
#else
$ touch a/b
#endif
$ hg up dir
a/b: untracked file conflicts with directory
abort: untracked files in working directory differ from files in requested revision
[255]
$ hg up dir --config merge.checkunknown=warn
a/b: replacing untracked file
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
(activating bookmark dir)
#if symlink
$ readlink.py a/b.orig
a/b.orig -> x
#endif
$ rm a/b.orig
Update - local directory conflicts with remote file
$ hg up -q 0
$ mkdir -p a/b/c
$ echo 9 > a/b/c/d
$ hg up file
a/b: untracked directory conflicts with file
abort: untracked files in working directory differ from files in requested revision
[255]
$ hg up file --config merge.checkunknown=warn
a/b: replacing untracked files in directory
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
(activating bookmark file)
$ cat a/b
1
$ test -d a/b.orig
$ rm -rf a/b.orig
Update - local directory conflicts with remote symlink
$ hg up -q 0
$ mkdir -p a/b/c
$ echo 9 > a/b/c/d
$ hg up link
a/b: untracked directory conflicts with file
abort: untracked files in working directory differ from files in requested revision
[255]
$ hg up link --config merge.checkunknown=warn
a/b: replacing untracked files in directory
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
(activating bookmark link)
#if symlink
$ readlink.py a/b
a/b -> c
#endif
$ test -d a/b.orig
$ rm -rf a/b.orig
Update - local renamed file conflicts with remote directory
$ hg up -q 0
$ hg mv base a
$ hg status -C
A a
base
R base
$ hg up --check dir
abort: uncommitted changes
[255]
$ hg up dir
a: path conflict - a file or link has the same name as a directory
the local file has been renamed to a~d20a80d4def3
resolve manually then use 'hg resolve --mark a'
1 files updated, 0 files merged, 0 files removed, 1 files unresolved
use 'hg resolve' to retry unresolved file merges
(activating bookmark dir)
[1]
$ hg status -C
A a~d20a80d4def3
base
R base
$ hg resolve --list
P a
$ hg up --clean -q 0
Update clean - local directory conflicts with changed remote file
$ hg up -q file
$ rm a/b
$ mkdir a/b
$ echo 9 > a/b/c
$ hg up file2 --check --config merge.checkunknown=warn
abort: uncommitted changes
[255]
$ hg up file2 --clean
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
(activating bookmark file2)