view tests/test-remotefilelog-gc.t @ 49672:e92de86cf4f8

emitrevision: consider ancestors revision to emit as available base

This should make more delta base valid. This notably affects:

* case where we skipped some parent with empty delta to directly delta against
  an ancestors
* case where an intermediate snapshots is stored.

This change means we could sent largish intermediate snapshots over the wire.
However this is actually a sub goal here. Sending snapshots over the wire means
the client have a high odd of simply storing the pre-computed delta instead of
doing a lengthy process that will… end up doing the same intermediate snapshot.

In addition the overall size of snapshot (or any level) is "only" some or the
overall delta size. (0.17% for my mercurial clone, 20% for my clone of Mozilla
try). So Sending them other the wire is unlikely to change large impact on the
bandwidth used.

If we decide that minimising the bandwidth is an explicit goal, we should
introduce new logic to filter-out snapshot as delta. The current code has no
notion explicite of snapshot so far, they just tended to fall into the wobbly
filtering options.

In some cases, this patch can yield large improvement to the bundling time:

    ### data-env-vars.name      = mozilla-try-2019-02-18-zstd-sparse-revlog
      # benchmark.name          = perf-bundle
      # benchmark.variants.revs = last-100000
    before: 68.787066 seconds
    after:  47.552677 seconds (-30.87%)

That translate to large improvement to the pull time :

    ### data-env-vars.name           = mozilla-try-2019-02-18-zstd-sparse-revlog
      # benchmark.name               = pull
      # benchmark.variants.issue6528 = disabled
      # benchmark.variants.revs      = last-100000
    before: 142.186625 seconds
    after:   75.897745 seconds  (-46.62%)

No significant negative impact have been observed.

#require no-windows

  $ . "$TESTDIR/remotefilelog-library.sh"

  $ hg init master
  $ cd master
  $ cat >> .hg/hgrc <<EOF
  > [remotefilelog]
  > server=True
  > serverexpiration=-1
  > EOF
  $ echo x > x
  $ hg commit -qAm x
  $ cd ..

  $ hgcloneshallow ssh://user@dummy/master shallow -q
  1 files fetched over 1 fetches - (1 misses, 0.00% hit ratio) over *s (glob)

# Set the prefetchdays config to zero so that all commits are prefetched
# no matter what their creation date is.
  $ cd shallow
  $ cat >> .hg/hgrc <<EOF
  > [remotefilelog]
  > prefetchdays=0
  > EOF
  $ cd ..

# commit a new version of x so we can gc the old one

  $ cd master
  $ echo y > x
  $ hg commit -qAm y
  $ cd ..

  $ cd shallow
  $ hg pull -q
  $ hg update -q
  1 files fetched over 1 fetches - (1 misses, 0.00% hit ratio) over *s (glob)
  $ cd ..

# gc client cache

  $ lastweek=`"$PYTHON" -c 'import datetime,time; print(datetime.datetime.fromtimestamp(time.time() - (86400 * 7)).strftime("%y%m%d%H%M"))'`
  $ find $CACHEDIR -type f -exec touch -t $lastweek {} \;

  $ find $CACHEDIR -type f | sort
  $TESTTMP/hgcache/master/11/f6ad8ec52a2984abaafd7c3b516503785c2072/1406e74118627694268417491f018a4a883152f0 (glob)
  $TESTTMP/hgcache/master/11/f6ad8ec52a2984abaafd7c3b516503785c2072/48023ec064c1d522f0d792a5a912bb1bf7859a4a (glob)
  $TESTTMP/hgcache/repos (glob)
  $ hg gc
  finished: removed 1 of 2 files (0.00 GB to 0.00 GB)
  $ find $CACHEDIR -type f | sort
  $TESTTMP/hgcache/master/11/f6ad8ec52a2984abaafd7c3b516503785c2072/48023ec064c1d522f0d792a5a912bb1bf7859a4a (glob)
  $TESTTMP/hgcache/repos

# gc server cache

  $ find master/.hg/remotefilelogcache -type f | sort
  master/.hg/remotefilelogcache/x/1406e74118627694268417491f018a4a883152f0 (glob)
  master/.hg/remotefilelogcache/x/48023ec064c1d522f0d792a5a912bb1bf7859a4a (glob)
  $ hg gc master
  finished: removed 0 of 1 files (0.00 GB to 0.00 GB)
  $ find master/.hg/remotefilelogcache -type f | sort
  master/.hg/remotefilelogcache/x/48023ec064c1d522f0d792a5a912bb1bf7859a4a (glob)

# Test that GC keepset includes pullprefetch revset if it is configured

  $ cd shallow
  $ cat >> .hg/hgrc <<EOF
  > [remotefilelog]
  > pullprefetch=all()
  > EOF
  $ hg prefetch
  1 files fetched over 1 fetches - (1 misses, 0.00% hit ratio) over *s (glob)

  $ cd ..
  $ hg gc
  finished: removed 0 of 2 files (0.00 GB to 0.00 GB)

# Ensure that there are 2 versions of the file in cache
  $ find $CACHEDIR -type f | sort
  $TESTTMP/hgcache/master/11/f6ad8ec52a2984abaafd7c3b516503785c2072/1406e74118627694268417491f018a4a883152f0 (glob)
  $TESTTMP/hgcache/master/11/f6ad8ec52a2984abaafd7c3b516503785c2072/48023ec064c1d522f0d792a5a912bb1bf7859a4a (glob)
  $TESTTMP/hgcache/repos (glob)

# Test that if garbage collection on repack and repack on hg gc flags are set then incremental repack with garbage collector is run

  $ hg gc --config remotefilelog.gcrepack=True --config remotefilelog.repackonhggc=True

# Ensure that loose files are repacked
  $ find $CACHEDIR -type f | sort
  $TESTTMP/hgcache/master/packs/320dab99b7e3f60512b97f347689625263d22cf5.dataidx
  $TESTTMP/hgcache/master/packs/320dab99b7e3f60512b97f347689625263d22cf5.datapack
  $TESTTMP/hgcache/master/packs/837b83c1ef6485a336eb4421ac5973c0ec130fbb.histidx
  $TESTTMP/hgcache/master/packs/837b83c1ef6485a336eb4421ac5973c0ec130fbb.histpack
  $TESTTMP/hgcache/repos

# Test that warning is displayed when there are no valid repos in repofile

  $ cp $CACHEDIR/repos $CACHEDIR/repos.bak
  $ echo " " > $CACHEDIR/repos
  $ hg gc
  warning: no valid repos in repofile
  $ mv $CACHEDIR/repos.bak $CACHEDIR/repos

# Test that warning is displayed when the repo path is malformed

  $ printf "asdas\0das" >> $CACHEDIR/repos
  $ hg gc
  abort: invalid path asdas\x00da: .*(null|NULL).* (re)
  [255]