requires: re-use vfs.tryread for simplicity
Avoids calling `set` twice or having to re-raise an exception and implements the routine with a single return expression.
A new repository uses zlib storage, which doesn't need a requirement
$ cat << EOF >> $HGRCPATH
> [format]
> # stabilize test accross variant
> revlog-compression=zlib
> EOF
$ hg init default
$ cd default
$ hg debugrequires | grep compression
[1]
$ 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'
$ hg debugrequires | grep compression
[1]
$ 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
$ hg debugrequires | grep compression
revlog-compression-zstd
$ 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
$ hg debugrequires -R none-compression/ | grep compression
exp-compression-none
$ $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