corruption: backout changeset 49fd21f32695 (issue6528)
inverting the parent is masking copy information leading to bad content being
fetched and bad status result.
Since 49fd21f32695, exchange can actively swap these parent corrupting existing
changesets and triggering the corruption.
Data corruption are considered critical so backing this out and doing and
unscheduled release seems in order.
Differential Revision: https://phab.mercurial-scm.org/D10995
#require hardlink
$ echo "[extensions]" >> $HGRCPATH
$ echo "relink=" >> $HGRCPATH
$ fix_path() {
> tr '\\' /
> }
$ cat > arelinked.py <<EOF
> from __future__ import absolute_import, print_function
> import os
> import sys
> from mercurial import (
> pycompat,
> util,
> )
> path1, path2 = sys.argv[1:3]
> if util.samefile(pycompat.fsencode(path1), pycompat.fsencode(path2)):
> print('%s == %s' % (path1, path2))
> else:
> print('%s != %s' % (path1, path2))
> EOF
create source repository
$ hg init repo
$ cd repo
$ echo a > a
$ echo b > b
$ hg ci -Am addfile
adding a
adding b
$ cat "$TESTDIR/binfile.bin" >> a
$ cat "$TESTDIR/binfile.bin" >> b
$ hg ci -Am changefiles
make another commit to create files larger than 1 KB to test
formatting of final byte count
$ cat "$TESTDIR/binfile.bin" >> a
$ cat "$TESTDIR/binfile.bin" >> b
$ hg ci -m anotherchange
don't sit forever trying to double-lock the source repo
$ hg relink .
relinking $TESTTMP/repo/.hg/store to $TESTTMP/repo/.hg/store
there is nothing to relink
Test files are read in binary mode
$ "$PYTHON" -c "open('.hg/store/data/dummy.i', 'wb').write(b'a\r\nb\n')"
$ cd ..
clone and pull to break links
$ hg clone --pull -r0 repo clone
adding changesets
adding manifests
adding file changes
added 1 changesets with 2 changes to 2 files
new changesets 008c0c271c47
updating to branch default
2 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ cd clone
$ hg pull -q
$ echo b >> b
$ hg ci -m changeb
created new head
$ "$PYTHON" -c "open('.hg/store/data/dummy.i', 'wb').write(b'a\nb\r\n')"
relink
#if no-reposimplestore
$ hg relink --debug --config progress.debug=true | fix_path
relinking $TESTTMP/repo/.hg/store to $TESTTMP/clone/.hg/store
tip has 2 files, estimated total number of files: 3
collecting: 00changelog.i 1/3 files (33.33%)
collecting: 00manifest.i 2/3 files (66.67%)
collecting: a.i 3/3 files (100.00%)
collecting: b.i 4/3 files (133.33%)
collecting: dummy.i 5/3 files (166.67%)
collected 5 candidate storage files
not linkable: 00changelog.i
not linkable: 00manifest.i
pruning: data/a.i 3/5 files (60.00%)
not linkable: data/b.i
pruning: data/dummy.i 5/5 files (100.00%)
pruned down to 2 probably relinkable files
relinking: data/a.i 1/2 files (50.00%)
not linkable: data/dummy.i
relinked 1 files (1.36 KB reclaimed)
$ cd ..
check hardlinks
$ "$PYTHON" arelinked.py repo/.hg/store/data/a.i clone/.hg/store/data/a.i
repo/.hg/store/data/a.i == clone/.hg/store/data/a.i
$ "$PYTHON" arelinked.py repo/.hg/store/data/b.i clone/.hg/store/data/b.i
repo/.hg/store/data/b.i != clone/.hg/store/data/b.i
#endif