sharesafe: add functionality to automatically downgrade shares
Reasoning is same as previous patch which adds automatic upgrade support.
Downgrade is required as if automatic upgrade is enabled, all shares upgrade and
then source repository downgrades, shares won't work. We need to downgrade them.
Differential Revision: https://phab.mercurial-scm.org/D9680
A new repository uses zlib storage, which doesn't need a requirement
$ hg init default
$ cd default
$ cat .hg/requires
dotencode
fncache
generaldelta
revlogv1
sparserevlog
store
testonly-simplestore (reposimplestore !)
$ touch foo
$ hg -q commit -A -m 'initial commit with a lot of repeated repeated repeated text to trigger compression'
$ hg debugrevlog -c | grep 0x78
0x78 (x) : 1 (100.00%)
0x78 (x) : 110 (100.00%)
$ cd ..
Unknown compression engine to format.compression aborts
$ hg --config format.revlog-compression=unknown init unknown
abort: compression engines "unknown" defined by format.revlog-compression not available
(run "hg debuginstall" to list available compression engines)
[255]
unknown compression engine in a list with known one works fine
$ hg --config format.revlog-compression=zlib,unknown init zlib-before-unknow
$ hg --config format.revlog-compression=unknown,zlib init unknown-before-zlib
A requirement specifying an unknown compression engine results in bail
$ hg init unknownrequirement
$ cd unknownrequirement
$ echo exp-compression-unknown >> .hg/requires
$ hg log
abort: repository requires features unknown to this Mercurial: exp-compression-unknown
(see https://mercurial-scm.org/wiki/MissingRequirement for more information)
[255]
$ cd ..
Specifying a new format.compression on an existing repo won't introduce data
with that engine or a requirement
$ cd default
$ touch bar
$ hg --config format.revlog-compression=none -q commit -A -m 'add bar with a lot of repeated repeated repeated text'
$ cat .hg/requires
dotencode
fncache
generaldelta
revlogv1
sparserevlog
store
testonly-simplestore (reposimplestore !)
$ hg debugrevlog -c | grep 0x78
0x78 (x) : 2 (100.00%)
0x78 (x) : 199 (100.00%)
$ cd ..
#if zstd
$ hg --config format.revlog-compression=zstd init zstd
$ cd zstd
$ cat .hg/requires
dotencode
fncache
generaldelta
revlog-compression-zstd
revlogv1
sparserevlog
store
testonly-simplestore (reposimplestore !)
$ touch foo
$ hg -q commit -A -m 'initial commit with a lot of repeated repeated repeated text'
$ hg debugrevlog -c | grep 0x28
0x28 : 1 (100.00%)
0x28 : 98 (100.00%)
$ cd ..
#endif
checking zlib options
=====================
$ hg init zlib-level-default
$ hg init zlib-level-1
$ cat << EOF >> zlib-level-1/.hg/hgrc
> [storage]
> revlog.zlib.level=1
> EOF
$ hg init zlib-level-9
$ cat << EOF >> zlib-level-9/.hg/hgrc
> [storage]
> revlog.zlib.level=9
> EOF
$ commitone() {
> repo=$1
> cp $RUNTESTDIR/bundles/issue4438-r1.hg $repo/a
> hg -R $repo add $repo/a
> hg -R $repo commit -m some-commit
> }
$ for repo in zlib-level-default zlib-level-1 zlib-level-9; do
> commitone $repo
> done
$ $RUNTESTDIR/f -s */.hg/store/data/*
default/.hg/store/data/bar.i: size=64
default/.hg/store/data/foo.i: size=64
zlib-level-1/.hg/store/data/a.i: size=4146
zlib-level-9/.hg/store/data/a.i: size=4138
zlib-level-default/.hg/store/data/a.i: size=4138
zstd/.hg/store/data/foo.i: size=64 (zstd !)
Test error cases
$ hg init zlib-level-invalid
$ cat << EOF >> zlib-level-invalid/.hg/hgrc
> [storage]
> revlog.zlib.level=foobar
> EOF
$ commitone zlib-level-invalid
config error: storage.revlog.zlib.level is not a valid integer ('foobar')
config error: storage.revlog.zlib.level is not a valid integer ('foobar')
[30]
$ hg init zlib-level-out-of-range
$ cat << EOF >> zlib-level-out-of-range/.hg/hgrc
> [storage]
> revlog.zlib.level=42
> EOF
$ commitone zlib-level-out-of-range
abort: invalid value for `storage.revlog.zlib.level` config: 42
abort: invalid value for `storage.revlog.zlib.level` config: 42
[255]
checking details of none compression
====================================
$ hg init none-compression --config format.revlog-compression=none
$ commitone() {
> repo=$1
> cp $RUNTESTDIR/bundles/issue4438-r1.hg $repo/a
> hg -R $repo add $repo/a
> hg -R $repo commit -m some-commit
> }
$ commitone none-compression
$ hg log -R none-compression
changeset: 0:68b53da39cd8
tag: tip
user: test
date: Thu Jan 01 00:00:00 1970 +0000
summary: some-commit
$ cat none-compression/.hg/requires
dotencode
exp-compression-none
fncache
generaldelta
revlogv1
sparserevlog
store
testonly-simplestore (reposimplestore !)
$ $RUNTESTDIR/f -s none-compression/.hg/store/data/*
none-compression/.hg/store/data/a.i: size=4216
#if zstd
checking zstd options
=====================
$ hg init zstd-level-default --config format.revlog-compression=zstd
$ hg init zstd-level-1 --config format.revlog-compression=zstd
$ cat << EOF >> zstd-level-1/.hg/hgrc
> [storage]
> revlog.zstd.level=1
> EOF
$ hg init zstd-level-22 --config format.revlog-compression=zstd
$ cat << EOF >> zstd-level-22/.hg/hgrc
> [storage]
> revlog.zstd.level=22
> EOF
$ commitone() {
> repo=$1
> cp $RUNTESTDIR/bundles/issue4438-r1.hg $repo/a
> hg -R $repo add $repo/a
> hg -R $repo commit -m some-commit
> }
$ for repo in zstd-level-default zstd-level-1 zstd-level-22; do
> commitone $repo
> done
$ $RUNTESTDIR/f -s zstd-*/.hg/store/data/*
zstd-level-1/.hg/store/data/a.i: size=4114
zstd-level-22/.hg/store/data/a.i: size=4091
zstd-level-default/\.hg/store/data/a\.i: size=(4094|4102) (re)
Test error cases
$ hg init zstd-level-invalid --config format.revlog-compression=zstd
$ cat << EOF >> zstd-level-invalid/.hg/hgrc
> [storage]
> revlog.zstd.level=foobar
> EOF
$ commitone zstd-level-invalid
config error: storage.revlog.zstd.level is not a valid integer ('foobar')
config error: storage.revlog.zstd.level is not a valid integer ('foobar')
[30]
$ hg init zstd-level-out-of-range --config format.revlog-compression=zstd
$ cat << EOF >> zstd-level-out-of-range/.hg/hgrc
> [storage]
> revlog.zstd.level=42
> EOF
$ commitone zstd-level-out-of-range
abort: invalid value for `storage.revlog.zstd.level` config: 42
abort: invalid value for `storage.revlog.zstd.level` config: 42
[255]
#endif