dirstate: use a single closure for get_flags
The previous code was overlooking fallback when neither symlink not exec was
supported.
The number of "variants" is getting too high, so I am consolidating this in a
single closure that should be easier to maintains.
This also ensure that fallback flags are always taken into account.
(they are not user code yet, but small experimentation shown that the feature
was working as intended.)
A a small side effect we need to check for symlink support more lazily and this
show up in the test in a couple of places.
Differential Revision: https://phab.mercurial-scm.org/D11728
====================================
Test delta choice with sparse revlog
====================================
Sparse-revlog usually shows the most gain on Manifest. However, it is simpler
to general an appropriate file, so we test with a single file instead. The
goal is to observe intermediate snapshot being created.
We need a large enough file. Part of the content needs to be replaced
repeatedly while some of it changes rarely.
$ bundlepath="$TESTDIR/artifacts/cache/big-file-churn.hg"
$ expectedhash=`cat "$bundlepath".md5`
#if slow
$ if [ ! -f "$bundlepath" ]; then
> "$TESTDIR"/artifacts/scripts/generate-churning-bundle.py > /dev/null
> fi
#else
$ if [ ! -f "$bundlepath" ]; then
> echo 'skipped: missing artifact, run "'"$TESTDIR"'/artifacts/scripts/generate-churning-bundle.py"'
> exit 80
> fi
#endif
$ currenthash=`f -M "$bundlepath" | cut -d = -f 2`
$ if [ "$currenthash" != "$expectedhash" ]; then
> echo 'skipped: outdated artifact, md5 "'"$currenthash"'" expected "'"$expectedhash"'" run "'"$TESTDIR"'/artifacts/scripts/generate-churning-bundle.py"'
> exit 80
> fi
$ cat >> $HGRCPATH << EOF
> [format]
> sparse-revlog = yes
> maxchainlen = 15
> [storage]
> revlog.optimize-delta-parent-choice = yes
> revlog.reuse-external-delta = no
> EOF
$ hg init sparse-repo
$ cd sparse-repo
$ hg unbundle $bundlepath
adding changesets
adding manifests
adding file changes
added 5001 changesets with 5001 changes to 1 files (+89 heads)
new changesets 9706f5af64f4:d9032adc8114 (5001 drafts)
(run 'hg heads' to see heads, 'hg merge' to merge)
$ hg up
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
updated to "d9032adc8114: commit #5000"
89 other heads for branch "default"
$ hg log --stat -r 0:3
changeset: 0:9706f5af64f4
user: test
date: Thu Jan 01 00:00:00 1970 +0000
summary: initial commit
SPARSE-REVLOG-TEST-FILE | 10500 ++++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 10500 insertions(+), 0 deletions(-)
changeset: 1:724907deaa5e
user: test
date: Thu Jan 01 00:00:00 1970 +0000
summary: commit #1
SPARSE-REVLOG-TEST-FILE | 1068 +++++++++++++++++++++++-----------------------
1 files changed, 534 insertions(+), 534 deletions(-)
changeset: 2:62c41bce3e5d
user: test
date: Thu Jan 01 00:00:00 1970 +0000
summary: commit #2
SPARSE-REVLOG-TEST-FILE | 1068 +++++++++++++++++++++++-----------------------
1 files changed, 534 insertions(+), 534 deletions(-)
changeset: 3:348a9cbd6959
user: test
date: Thu Jan 01 00:00:00 1970 +0000
summary: commit #3
SPARSE-REVLOG-TEST-FILE | 1068 +++++++++++++++++++++++-----------------------
1 files changed, 534 insertions(+), 534 deletions(-)
$ f -s .hg/store/data/*.d
.hg/store/data/_s_p_a_r_s_e-_r_e_v_l_o_g-_t_e_s_t-_f_i_l_e.d: size=63327412
$ hg debugrevlog *
format : 1
flags : generaldelta
revisions : 5001
merges : 625 (12.50%)
normal : 4376 (87.50%)
revisions : 5001
empty : 0 ( 0.00%)
text : 0 (100.00%)
delta : 0 (100.00%)
snapshot : 383 ( 7.66%)
lvl-0 : 3 ( 0.06%)
lvl-1 : 20 ( 0.40%)
lvl-2 : 68 ( 1.36%)
lvl-3 : 112 ( 2.24%)
lvl-4 : 180 ( 3.60%)
deltas : 4618 (92.34%)
revision size : 63327412
snapshot : 9886710 (15.61%)
lvl-0 : 603104 ( 0.95%)
lvl-1 : 1559991 ( 2.46%)
lvl-2 : 2295592 ( 3.62%)
lvl-3 : 2531199 ( 4.00%)
lvl-4 : 2896824 ( 4.57%)
deltas : 53440702 (84.39%)
chunks : 5001
0x78 (x) : 5001 (100.00%)
chunks size : 63327412
0x78 (x) : 63327412 (100.00%)
avg chain length : 9
max chain length : 15
max chain reach : 28248745
compression ratio : 27
uncompressed data size (min/max/avg) : 346468 / 346472 / 346471
full revision size (min/max/avg) : 201008 / 201050 / 201034
inter-snapshot size (min/max/avg) : 11596 / 168150 / 24430
level-1 (min/max/avg) : 16653 / 168150 / 77999
level-2 (min/max/avg) : 12951 / 85595 / 33758
level-3 (min/max/avg) : 11608 / 43029 / 22599
level-4 (min/max/avg) : 11596 / 21632 / 16093
delta size (min/max/avg) : 10649 / 107163 / 11572
deltas against prev : 3910 (84.67%)
where prev = p1 : 3910 (100.00%)
where prev = p2 : 0 ( 0.00%)
other : 0 ( 0.00%)
deltas against p1 : 648 (14.03%)
deltas against p2 : 60 ( 1.30%)
deltas against other : 0 ( 0.00%)