snapshot: consider all snapshots in the parents' chains
There are no reasons to only consider full snapshot as a possible base for an
intermediate snapshot. Now that the basic principles have been set, we can
start adding more levels of snapshots.
We now consider all snapshots in the parent's chains (full or intermediate).
This creates a chain of intermediate snapshots, each smaller than the previous
one.
# Effect On The Test Repository
In the test repository, we can see a decrease in the revlog size and slightly
shorter delta chain.
However, that approach creates snapshots more frequently, increasing the risk
of ending into problematic cases in very branchy repositories (not triggered
by the test repository). The next changesets will remove that risk by adding
logic that increases deltas reuse.
test stripping of filelogs where the linkrev doesn't always increase
$ echo '[extensions]' >> $HGRCPATH
$ echo 'strip =' >> $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 linkrev nodeid p1 p2
0 0 6f105cbb914d 000000000000 000000000000
1 3 1b55917b3699 000000000000 000000000000
2 1 8f3d04e263e5 000000000000 000000000000
3 2 f0ef8726ac4f 000000000000 000000000000
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 linkrev nodeid p1 p2
0 0 b8e02f643373 000000000000 000000000000
1 1 5d9299349fc0 000000000000 000000000000
2 2 2661d26c6496 000000000000 000000000000
021
rev linkrev nodeid p1 p2
0 0 b8e02f643373 000000000000 000000000000
1 2 5d9299349fc0 000000000000 000000000000
2 1 2661d26c6496 000000000000 000000000000
102
rev linkrev nodeid p1 p2
0 1 b8e02f643373 000000000000 000000000000
1 0 5d9299349fc0 000000000000 000000000000
2 2 2661d26c6496 000000000000 000000000000
120
rev linkrev nodeid p1 p2
0 1 b8e02f643373 000000000000 000000000000
1 2 5d9299349fc0 000000000000 000000000000
2 0 2661d26c6496 000000000000 000000000000
201
rev linkrev nodeid p1 p2
0 2 b8e02f643373 000000000000 000000000000
1 0 5d9299349fc0 000000000000 000000000000
2 1 2661d26c6496 000000000000 000000000000
210
rev linkrev nodeid p1 p2
0 2 b8e02f643373 000000000000 000000000000
1 1 5d9299349fc0 000000000000 000000000000
2 0 2661d26c6496 000000000000 000000000000
manifest-file
rev linkrev nodeid p1 p2
0 3 b8e02f643373 000000000000 000000000000
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
checked 4 changesets with 15 changes to 7 files
% 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
checked 4 changesets with 14 changes to 7 files
% 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
checked 4 changesets with 14 changes to 7 files
% 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
checked 4 changesets with 19 changes to 7 files
% 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
checked 4 changesets with 19 changes to 7 files