# HG changeset patch
# User Joerg Sonnenberger <joerg@bec.de>
# Date 1607815143 -3600
# Node ID 84130fd74a223039a1af6876823b820270881eee
# Parent  c000eff2c6353e1418007632b23f147caf47b8b8
revlog: support none compression

revlog files had uncompressed revlog entries support since forever, but
it wasn't selectable or exposed explicitly. It is occassionally useful
for performance testing as it avoids the latency of zlib or zstd. It
also has the nice side effect of providing a non-default compression
engine out-of-the-box.

Differential Revision: https://phab.mercurial-scm.org/D9572

diff -r c000eff2c635 -r 84130fd74a22 mercurial/utils/compression.py
--- a/mercurial/utils/compression.py	Thu Nov 12 10:41:03 2020 -0800
+++ b/mercurial/utils/compression.py	Sun Dec 13 00:19:03 2020 +0100
@@ -617,8 +617,10 @@
     def wireprotosupport(self):
         return compewireprotosupport(b'none', 0, 10)
 
-    # We don't implement revlogheader because it is handled specially
-    # in the revlog class.
+    # revlog special cases the uncompressed case, but implementing
+    # revlogheader allows forcing uncompressed storage.
+    def revlogheader(self):
+        return b'\0'
 
     def compressstream(self, it, opts=None):
         return it
diff -r c000eff2c635 -r 84130fd74a22 tests/test-repo-compengines.t
--- a/tests/test-repo-compengines.t	Thu Nov 12 10:41:03 2020 -0800
+++ b/tests/test-repo-compengines.t	Sun Dec 13 00:19:03 2020 +0100
@@ -43,6 +43,27 @@
 
   $ 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
@@ -66,25 +87,6 @@
 
   $ 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=zstd -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%)
 
 #endif
 
@@ -116,10 +118,12 @@
   > done
 
   $ $RUNTESTDIR/f -s */.hg/store/data/*
-  default/.hg/store/data/foo.i: size=64 (pure !)
+  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
 
@@ -144,6 +148,41 @@
   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