localrepo: stop doing special dirstate backup at transaction open
Since the dirstate writes are already managed by the transaction, we already do
a backup of the dirstate when necessary (and even trigger one to keep `hg
rollback` happy).
We needs some special code to deal with the initial empty checkout, but it is
not too complicated.
Managing variable filename (as dirstate-v2 uses) at the "journalfile" level, is
complex and fragile (which is consistent with the fact these files are not
journal…). If we no longer do it, our life is significantly simpler.
In some sense, we apply the xkcd-1134¹ solution to our savebackup/restorebackup
problem.
[1] https://xkcd.com/1134/
(the change to test-hardlink are expect as decreasing the number of duplicated
backup drive the hardlink count down)
# common patterns in test at can safely be replaced
import os
substitutions = [
# list of possible compressions
(br'(zstd,)?zlib,none,bzip2', br'$USUAL_COMPRESSIONS$'),
(br'=(zstd,)?zlib', br'=$BUNDLE2_COMPRESSIONS$'),
# capabilities sent through http
(
br'bundlecaps=HG20%2Cbundle2%3DHG20%250A'
br'bookmarks%250A'
br'changegroup%253D01%252C02%250A'
br'checkheads%253Drelated%250A'
br'digests%253Dmd5%252Csha1%252Csha512%250A'
br'error%253Dabort%252Cunsupportedcontent%252Cpushraced%252Cpushkey%250A'
br'hgtagsfnodes%250A'
br'listkeys%250A'
br'phases%253Dheads%250A'
br'pushkey%250A'
br'remote-changegroup%253Dhttp%252Chttps%250A'
br'stream%253Dv2',
# (the replacement patterns)
br'$USUAL_BUNDLE_CAPS$',
),
(
br'bundlecaps=HG20%2Cbundle2%3DHG20%250A'
br'bookmarks%250A'
br'changegroup%253D01%252C02%250A'
br'checkheads%3Drelated%0A'
br'digests%253Dmd5%252Csha1%252Csha512%250A'
br'error%253Dabort%252Cunsupportedcontent%252Cpushraced%252Cpushkey%250A'
br'hgtagsfnodes%250A'
br'listkeys%250A'
br'phases%253Dheads%250A'
br'pushkey%250A'
br'remote-changegroup%253Dhttp%252Chttps',
# (the replacement patterns)
br'$USUAL_BUNDLE_CAPS_SERVER$',
),
# bundle2 capabilities sent through ssh
(
br'bundle2=HG20%0A'
br'bookmarks%0A'
br'changegroup%3D01%2C02%0A'
br'checkheads%3Drelated%0A'
br'digests%3Dmd5%2Csha1%2Csha512%0A'
br'error%3Dabort%2Cunsupportedcontent%2Cpushraced%2Cpushkey%0A'
br'hgtagsfnodes%0A'
br'listkeys%0A'
br'phases%3Dheads%0A'
br'pushkey%0A'
br'remote-changegroup%3Dhttp%2Chttps%0A'
br'stream%3Dv2',
# (replacement patterns)
br'$USUAL_BUNDLE2_CAPS$',
),
# bundle2 capabilities advertised by the server
(
br'bundle2=HG20%0A'
br'bookmarks%0A'
br'changegroup%3D01%2C02%0A'
br'checkheads%3Drelated%0A'
br'digests%3Dmd5%2Csha1%2Csha512%0A'
br'error%3Dabort%2Cunsupportedcontent%2Cpushraced%2Cpushkey%0A'
br'hgtagsfnodes%0A'
br'listkeys%0A'
br'phases%3Dheads%0A'
br'pushkey%0A'
br'remote-changegroup%3Dhttp%2Chttps',
# (replacement patterns)
br'$USUAL_BUNDLE2_CAPS_SERVER$',
),
(
br'bundle2=HG20%0A'
br'bookmarks%0A'
br'changegroup%3D01%2C02%0A'
br'digests%3Dmd5%2Csha1%2Csha512%0A'
br'error%3Dabort%2Cunsupportedcontent%2Cpushraced%2Cpushkey%0A'
br'hgtagsfnodes%0A'
br'listkeys%0A'
br'pushkey%0A'
br'remote-changegroup%3Dhttp%2Chttps%0A'
br'stream%3Dv2',
# (replacement patterns)
br'$USUAL_BUNDLE2_CAPS_NO_PHASES$',
),
# HTTP access log dates
(
br' - - \[\d\d/.../2\d\d\d \d\d:\d\d:\d\d] "(GET|PUT|POST)',
lambda m: br' - - [$LOGDATE$] "' + m.group(1),
),
# HTTP error log dates
(
br' - - \[\d\d/.../2\d\d\d \d\d:\d\d:\d\d] (HG error:|Exception)',
lambda m: br' - - [$ERRDATE$] ' + m.group(1),
),
# HTTP header dates- RFC 1123
(
br'([Dd]ate): [A-Za-z]{3}, \d\d [A-Za-z]{3} \d{4} \d\d:\d\d:\d\d GMT',
lambda m: br'%s: $HTTP_DATE$' % m.group(1),
),
# LFS expiration value
(
br'"expires_at": "\d{4}-\d\d-\d\dT\d\d:\d\d:\d\dZ"',
br'"expires_at": "$ISO_8601_DATE_TIME$"',
),
# Windows has an extra '/' in the following lines that get globbed away:
# pushing to file:/*/$TESTTMP/r2 (glob)
# comparing with file:/*/$TESTTMP/r2 (glob)
# sub/maybelarge.dat: largefile 34..9c not available from
# file:/*/$TESTTMP/largefiles-repo (glob)
(
br'(.*file:/)/?(/\$TESTTMP.*)',
lambda m: m.group(1) + b'*' + m.group(2) + b' (glob)',
),
# `hg clone --stream` output
(
br'transferred (\S+?) KB in \S+? seconds \(.+?/sec\)(?: \(glob\))?(.*)',
lambda m: (
br'transferred %s KB in * seconds (* */sec) (glob)%s'
% (m.group(1), m.group(2))
),
),
]
# Various platform error strings, keyed on a common replacement string
_errors = {
br'$ENOENT$': (
# IOError in Python does not have the same error message
# than in Rust, and automatic conversion is not possible
# because of module member privacy.
br'No such file or directory \(os error 2\)',
# strerror()
br'No such file or directory',
# FormatMessage(ERROR_FILE_NOT_FOUND)
br'The system cannot find the file specified',
),
br'$ENOTDIR$': (
# strerror()
br'Not a directory',
# FormatMessage(ERROR_PATH_NOT_FOUND)
br'The system cannot find the path specified',
),
br'$ECONNRESET$': (
# strerror()
br'Connection reset by peer',
# FormatMessage(WSAECONNRESET)
br'An existing connection was forcibly closed by the remote host',
),
br'$EADDRINUSE$': (
# strerror()
br'Address already in use',
# FormatMessage(WSAEADDRINUSE)
br'Only one usage of each socket address'
br' \(protocol/network address/port\) is normally permitted',
),
br'$EADDRNOTAVAIL$': (
# strerror()
br'Cannot assign requested address',
br'Can\'t assign requested address',
# FormatMessage(WSAEADDRNOTAVAIL)
),
}
for replace, msgs in _errors.items():
substitutions.extend((m, replace) for m in msgs)
# Output lines on Windows that can be autocorrected for '\' vs '/' path
# differences.
_winpathfixes = [
# cloning subrepo s\ss from $TESTTMP/t/s/ss
# cloning subrepo foo\bar from http://localhost:$HGPORT/foo/bar
br'(?m)^cloning subrepo \S+\\.*',
# pulling from $TESTTMP\issue1852a
br'(?m)^pulling from \$TESTTMP\\.*',
# pushing to $TESTTMP\a
br'(?m)^pushing to \$TESTTMP\\.*',
# pushing subrepo s\ss to $TESTTMP/t/s/ss
br'(?m)^pushing subrepo \S+\\\S+ to.*',
# moving d1\d11\a1 to d3/d11/a1
br'(?m)^moving \S+\\.*',
# d1\a: not recording move - dummy does not exist
br'\S+\\\S+: not recording move .+',
# reverting s\a
br'(?m)^reverting (?!subrepo ).*\\.*',
# saved backup bundle to
# $TESTTMP\test\.hg\strip-backup/443431ffac4f-2fc5398a-backup.hg
br'(?m)^saved backup bundle to \$TESTTMP.*\.hg',
# no changes made to subrepo s\ss since last push to ../tcc/s/ss
br'(?m)^no changes made to subrepo \S+\\\S+ since.*',
# changeset 5:9cc5aa7204f0: stuff/maybelarge.dat references missing
# $TESTTMP\largefiles-repo-hg\.hg\largefiles\76..38
br'(?m)^changeset .* references (corrupted|missing) \$TESTTMP\\.*',
# stuff/maybelarge.dat: largefile 76..38 not available from
# file:/*/$TESTTMP\largefiles-repo (glob)
br'.*: largefile \S+ not available from file:/\*/.+',
]
if os.name == 'nt':
substitutions.extend(
[
(s, lambda match: match.group().replace(b'\\', b'/'))
for s in _winpathfixes
]
)