requirements: add an official `REVLOG_COMPRESSION_ZSTD` const

Such constant was missing and its value was missing from the set of requirements
that needs to be preserved through stream clone. This did not had any
consequence yet as the "bundle 2 does not filter its requirements" is shadowing
the issue.

However we are now in a situation where we can fix this issue. So lets do it
next.

With the preparation work on test, changing the streamreqs value only impact two
tests, where checking the full value seems to remains relevant.

Important note: Since older version of Mercurial used the old `supportedformat`
class attribute to check for stream requirement they supported, older version
will consider this requirements to prevent them from using streaming clone. Even
as they support this requirements for years. Pack for stable will be send to fix
it, but they will have to be backported to older version if needed.

Differential Revision: https://phab.mercurial-scm.org/D12083

mercurial/localrepo.py

@@ -932,7 +932,7 b' def gathersupportedrequirements(ui):'
         if engine.available() and engine.revlogheader():
             supported.add(b'exp-compression-%s' % name)
             if engine.name() == b'zstd':
-                supported.add(b'revlog-compression-zstd')
+                supported.add(requirementsmod.REVLOG_COMPRESSION_ZSTD)
 
     return supported
 

mercurial/requirements.py

@@ -36,6 +36,9 b" TREEMANIFEST_REQUIREMENT = b'treemanifes"
 
 REVLOGV1_REQUIREMENT = b'revlogv1'
 
+# allow using ZSTD as compression engine for revlog content
+REVLOG_COMPRESSION_ZSTD = b'revlog-compression-zstd'
+
 # Increment the sub-version when the revlog v2 format changes to lock out old
 # clients.
 CHANGELOGV2_REQUIREMENT = b'exp-changelog-v2'
@@ -109,6 +112,7 b' STREAM_FIXED_REQUIREMENTS = {'
     DIRSTATE_V2_REQUIREMENT,
     GENERALDELTA_REQUIREMENT,
     NODEMAP_REQUIREMENT,
+    REVLOG_COMPRESSION_ZSTD,
     REVLOGV1_REQUIREMENT,
     REVLOGV2_REQUIREMENT,
     SHARESAFE_REQUIREMENT,

tests/test-bundle.t

@@ -297,32 +297,32 b' packed1 is produced properly'
 
   $ hg -R test debugcreatestreamclonebundle packed.hg
   writing 2665 bytes for 6 files
-  bundle requirements: generaldelta, persistent-nodemap, revlogv1, sparserevlog
+  bundle requirements: generaldelta, persistent-nodemap, revlog-compression-zstd, revlogv1, sparserevlog
 
   $ f -B 64 --size --sha1 --hexdump packed.hg
-  packed.hg: size=2860, sha1=81d7a2e535892cda51e82c200f818de2cca828d3
+  packed.hg: size=2884, sha1=b0c868701f8a9fe44daf094b2f5bf661cf90c789
   0000: 48 47 53 31 55 4e 00 00 00 00 00 00 00 06 00 00 |HGS1UN..........|
-  0010: 00 00 00 00 0a 69 00 36 67 65 6e 65 72 61 6c 64 |.....i.6generald|
+  0010: 00 00 00 00 0a 69 00 4e 67 65 6e 65 72 61 6c 64 |.....i.Ngenerald|
   0020: 65 6c 74 61 2c 70 65 72 73 69 73 74 65 6e 74 2d |elta,persistent-|
-  0030: 6e 6f 64 65 6d 61 70 2c 72 65 76 6c 6f 67 76 31 |nodemap,revlogv1|
+  0030: 6e 6f 64 65 6d 61 70 2c 72 65 76 6c 6f 67 2d 63 |nodemap,revlog-c|
   $ hg debugbundle --spec packed.hg
-  none-packed1;requirements%3Dgeneraldelta%2Cpersistent-nodemap%2Crevlogv1%2Csparserevlog
+  none-packed1;requirements%3Dgeneraldelta%2Cpersistent-nodemap%2Crevlog-compression-zstd%2Crevlogv1%2Csparserevlog
 #endif
 
 #if reporevlogstore no-rust zstd
 
   $ hg -R test debugcreatestreamclonebundle packed.hg
   writing 2665 bytes for 6 files
-  bundle requirements: generaldelta, revlogv1, sparserevlog
+  bundle requirements: generaldelta, revlog-compression-zstd, revlogv1, sparserevlog
 
   $ f -B 64 --size --sha1 --hexdump packed.hg
-  packed.hg: size=2841, sha1=8b645a65f49b0ae43042a9f3da56d4bfdf1c7f99
+  packed.hg: size=2865, sha1=353d10311f4befa195d9a1ca4b8e26518115c702
   0000: 48 47 53 31 55 4e 00 00 00 00 00 00 00 06 00 00 |HGS1UN..........|
-  0010: 00 00 00 00 0a 69 00 23 67 65 6e 65 72 61 6c 64 |.....i.#generald|
-  0020: 65 6c 74 61 2c 72 65 76 6c 6f 67 76 31 2c 73 70 |elta,revlogv1,sp|
-  0030: 61 72 73 65 72 65 76 6c 6f 67 00 64 61 74 61 2f |arserevlog.data/|
+  0010: 00 00 00 00 0a 69 00 3b 67 65 6e 65 72 61 6c 64 |.....i.;generald|
+  0020: 65 6c 74 61 2c 72 65 76 6c 6f 67 2d 63 6f 6d 70 |elta,revlog-comp|
+  0030: 72 65 73 73 69 6f 6e 2d 7a 73 74 64 2c 72 65 76 |ression-zstd,rev|
   $ hg debugbundle --spec packed.hg
-  none-packed1;requirements%3Dgeneraldelta%2Crevlogv1%2Csparserevlog
+  none-packed1;requirements%3Dgeneraldelta%2Crevlog-compression-zstd%2Crevlogv1%2Csparserevlog
 #endif
 
 #if reporevlogstore no-rust no-zstd
@@ -357,17 +357,17 b' generaldelta requirement is not listed i'
 
   $ hg -R testnongd debugcreatestreamclonebundle packednongd.hg
   writing 301 bytes for 3 files
-  bundle requirements: persistent-nodemap, revlogv1
+  bundle requirements: persistent-nodemap, revlog-compression-zstd, revlogv1
 
   $ f -B 64 --size --sha1 --hexdump packednongd.hg
-  packednongd.hg: size=402, sha1=d3cc1417f0e8142cf9340aaaa520b660ad3ec3ea
+  packednongd.hg: size=426, sha1=79563ccd6ef779bcfe62a4da64f89a1b308e92e0
   0000: 48 47 53 31 55 4e 00 00 00 00 00 00 00 03 00 00 |HGS1UN..........|
-  0010: 00 00 00 00 01 2d 00 1c 70 65 72 73 69 73 74 65 |.....-..persiste|
+  0010: 00 00 00 00 01 2d 00 34 70 65 72 73 69 73 74 65 |.....-.4persiste|
   0020: 6e 74 2d 6e 6f 64 65 6d 61 70 2c 72 65 76 6c 6f |nt-nodemap,revlo|
-  0030: 67 76 31 00 64 61 74 61 2f 66 6f 6f 2e 69 00 36 |gv1.data/foo.i.6|
+  0030: 67 2d 63 6f 6d 70 72 65 73 73 69 6f 6e 2d 7a 73 |g-compression-zs|
 
   $ hg debugbundle --spec packednongd.hg
-  none-packed1;requirements%3Dpersistent-nodemap%2Crevlogv1
+  none-packed1;requirements%3Dpersistent-nodemap%2Crevlog-compression-zstd%2Crevlogv1
 
 #endif
 
@@ -375,17 +375,17 b' generaldelta requirement is not listed i'
 
   $ hg -R testnongd debugcreatestreamclonebundle packednongd.hg
   writing 301 bytes for 3 files
-  bundle requirements: revlogv1
+  bundle requirements: revlog-compression-zstd, revlogv1
 
   $ f -B 64 --size --sha1 --hexdump packednongd.hg
-  packednongd.hg: size=383, sha1=1d9c230238edd5d38907100b729ba72b1831fe6f
+  packednongd.hg: size=407, sha1=0b8714422b785ba8eb98c916b41ffd5fb994c9b5
   0000: 48 47 53 31 55 4e 00 00 00 00 00 00 00 03 00 00 |HGS1UN..........|
-  0010: 00 00 00 00 01 2d 00 09 72 65 76 6c 6f 67 76 31 |.....-..revlogv1|
-  0020: 00 64 61 74 61 2f 66 6f 6f 2e 69 00 36 34 0a 00 |.data/foo.i.64..|
-  0030: 01 00 01 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
+  0010: 00 00 00 00 01 2d 00 21 72 65 76 6c 6f 67 2d 63 |.....-.!revlog-c|
+  0020: 6f 6d 70 72 65 73 73 69 6f 6e 2d 7a 73 74 64 2c |ompression-zstd,|
+  0030: 72 65 76 6c 6f 67 76 31 00 64 61 74 61 2f 66 6f |revlogv1.data/fo|
 
   $ hg debugbundle --spec packednongd.hg
-  none-packed1;requirements%3Drevlogv1
+  none-packed1;requirements%3Drevlog-compression-zstd%2Crevlogv1
 
 
 #endif
@@ -427,7 +427,7 b' Warning emitted when packed bundles cont'
   $ hg -R testsecret debugcreatestreamclonebundle packedsecret.hg
   (warning: stream clone bundle will contain secret revisions)
   writing 301 bytes for 3 files
-  bundle requirements: generaldelta, persistent-nodemap, revlogv1, sparserevlog
+  bundle requirements: generaldelta, persistent-nodemap, revlog-compression-zstd, revlogv1, sparserevlog
 
 #endif
 
@@ -436,7 +436,7 b' Warning emitted when packed bundles cont'
   $ hg -R testsecret debugcreatestreamclonebundle packedsecret.hg
   (warning: stream clone bundle will contain secret revisions)
   writing 301 bytes for 3 files
-  bundle requirements: generaldelta, revlogv1, sparserevlog
+  bundle requirements: generaldelta, revlog-compression-zstd, revlogv1, sparserevlog
 
 #endif
 

tests/test-clonebundles.t

@@ -279,8 +279,9 b' Stream clone bundles are supported'
 
   $ hg -R server debugcreatestreamclonebundle packed.hg
   writing 613 bytes for 4 files
-  bundle requirements: generaldelta, revlogv1, sparserevlog (no-rust !)
-  bundle requirements: generaldelta, persistent-nodemap, revlogv1, sparserevlog (rust !)
+  bundle requirements: generaldelta, revlogv1, sparserevlog (no-rust no-zstd !)
+  bundle requirements: generaldelta, revlog-compression-zstd, revlogv1, sparserevlog (no-rust zstd !)
+  bundle requirements: generaldelta, persistent-nodemap, revlog-compression-zstd, revlogv1, sparserevlog (rust !)
 
 No bundle spec should work
 

tests/test-debugcommands.t

@@ -657,8 +657,8 b' Test debugpeer'
   devel-peer-request:   pairs: 81 bytes
   sending hello command
   sending between command
-  remote: 463
-  remote: capabilities: batch branchmap $USUAL_BUNDLE2_CAPS$ changegroupsubset getbundle known lookup protocaps pushkey streamreqs=generaldelta,persistent-nodemap,revlogv1,sparserevlog unbundle=HG10GZ,HG10BZ,HG10UN unbundlehash
+  remote: 487
+  remote: capabilities: batch branchmap $USUAL_BUNDLE2_CAPS$ changegroupsubset getbundle known lookup protocaps pushkey streamreqs=generaldelta,persistent-nodemap,revlog-compression-zstd,revlogv1,sparserevlog unbundle=HG10GZ,HG10BZ,HG10UN unbundlehash
   remote: 1
   devel-peer-request: protocaps
   devel-peer-request:   caps: * bytes (glob)
@@ -677,8 +677,8 b' Test debugpeer'
   devel-peer-request:   pairs: 81 bytes
   sending hello command
   sending between command
-  remote: 444
-  remote: capabilities: batch branchmap $USUAL_BUNDLE2_CAPS$ changegroupsubset getbundle known lookup protocaps pushkey streamreqs=generaldelta,revlogv1,sparserevlog unbundle=HG10GZ,HG10BZ,HG10UN unbundlehash
+  remote: 468
+  remote: capabilities: batch branchmap $USUAL_BUNDLE2_CAPS$ changegroupsubset getbundle known lookup protocaps pushkey streamreqs=generaldelta,revlog-compression-zstd,revlogv1,sparserevlog unbundle=HG10GZ,HG10BZ,HG10UN unbundlehash
   remote: 1
   devel-peer-request: protocaps
   devel-peer-request:   caps: * bytes (glob)