filectx: fix cmp() of file starting with '\1\n'
If file data starts with '\1\n', it will be escaped in the revlog to
create an empty metadata block, thus adding four bytes to the size in
the revlog size index. There's no way to detect that this has happened
in filelog.size() faster than decompressing each revision [1].
For filectx.cmp(), we have the size of the file in the working directory
available. If it differs by exactly four bytes, it may be this case, so
do a full comparison.
[1]: http://markmail.org/message/5akdbmmqx7vq2fsg
test stripping of filelogs where the linkrev doesn't always increase
$ echo '[extensions]' >> $HGRCPATH
$ echo 'hgext.mq =' >> $HGRCPATH
$ hg init orig
$ cd orig
$ commit()
> {
> hg up -qC null
> count=1
> for i in "$@"; do
> for f in $i; do
> echo $count > $f
> done
> count=`expr $count + 1`
> done
> hg commit -qAm "$*"
> }
2 1 0 2 0 1 2
$ commit '201 210'
$ commit '102 120' '210'
$ commit '021'
$ commit '201' '021 120'
$ commit '012 021' '102 201' '120 210'
$ commit 'manifest-file'
$ commit '102 120' '012 210' '021 201'
$ commit '201 210' '021 120' '012 102'
$ HGUSER=another-user; export HGUSER
$ commit 'manifest-file'
$ commit '012' 'manifest-file'
$ cd ..
$ hg clone -q -U -r -1 -r -2 -r -3 -r -4 -r -6 orig crossed
$ cd crossed
$ hg debugindex --manifest
rev offset length base linkrev nodeid p1 p2
0 0 112 0 0 6f105cbb914d 000000000000 000000000000
1 112 56 1 3 1b55917b3699 000000000000 000000000000
2 168 123 1 1 8f3d04e263e5 000000000000 000000000000
3 291 122 1 2 f0ef8726ac4f 000000000000 000000000000
4 413 87 4 4 0b76e38b4070 000000000000 000000000000
$ for i in 012 021 102 120 201 210 manifest-file; do
> echo $i
> hg debugindex $i
> echo
> done
012
rev offset length base linkrev nodeid p1 p2
0 0 3 0 0 b8e02f643373 000000000000 000000000000
1 3 3 1 1 5d9299349fc0 000000000000 000000000000
2 6 3 2 2 2661d26c6496 000000000000 000000000000
021
rev offset length base linkrev nodeid p1 p2
0 0 3 0 0 b8e02f643373 000000000000 000000000000
1 3 3 1 2 5d9299349fc0 000000000000 000000000000
2 6 3 2 1 2661d26c6496 000000000000 000000000000
102
rev offset length base linkrev nodeid p1 p2
0 0 3 0 1 b8e02f643373 000000000000 000000000000
1 3 3 1 0 5d9299349fc0 000000000000 000000000000
2 6 3 2 2 2661d26c6496 000000000000 000000000000
120
rev offset length base linkrev nodeid p1 p2
0 0 3 0 1 b8e02f643373 000000000000 000000000000
1 3 3 1 2 5d9299349fc0 000000000000 000000000000
2 6 3 2 0 2661d26c6496 000000000000 000000000000
201
rev offset length base linkrev nodeid p1 p2
0 0 3 0 2 b8e02f643373 000000000000 000000000000
1 3 3 1 0 5d9299349fc0 000000000000 000000000000
2 6 3 2 1 2661d26c6496 000000000000 000000000000
210
rev offset length base linkrev nodeid p1 p2
0 0 3 0 2 b8e02f643373 000000000000 000000000000
1 3 3 1 1 5d9299349fc0 000000000000 000000000000
2 6 3 2 0 2661d26c6496 000000000000 000000000000
manifest-file
rev offset length base linkrev nodeid p1 p2
0 0 3 0 3 b8e02f643373 000000000000 000000000000
1 3 3 1 4 5d9299349fc0 000000000000 000000000000
$ cd ..
$ for i in 0 1 2 3 4; do
> hg clone -q -U --pull crossed $i
> echo "% Trying to strip revision $i"
> hg --cwd $i strip $i
> echo "% Verifying"
> hg --cwd $i verify
> echo
> done
% Trying to strip revision 0
saved backup bundle to $TESTTMP/0/.hg/strip-backup/*-backup.hg (glob)
% Verifying
checking changesets
checking manifests
crosschecking files in changesets and manifests
checking files
7 files, 4 changesets, 15 total revisions
% Trying to strip revision 1
saved backup bundle to $TESTTMP/1/.hg/strip-backup/*-backup.hg (glob)
% Verifying
checking changesets
checking manifests
crosschecking files in changesets and manifests
checking files
7 files, 4 changesets, 14 total revisions
% Trying to strip revision 2
saved backup bundle to $TESTTMP/2/.hg/strip-backup/*-backup.hg (glob)
% Verifying
checking changesets
checking manifests
crosschecking files in changesets and manifests
checking files
7 files, 4 changesets, 14 total revisions
% Trying to strip revision 3
saved backup bundle to $TESTTMP/3/.hg/strip-backup/*-backup.hg (glob)
% Verifying
checking changesets
checking manifests
crosschecking files in changesets and manifests
checking files
7 files, 4 changesets, 19 total revisions
% Trying to strip revision 4
saved backup bundle to $TESTTMP/4/.hg/strip-backup/*-backup.hg (glob)
% Verifying
checking changesets
checking manifests
crosschecking files in changesets and manifests
checking files
7 files, 4 changesets, 19 total revisions