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sshpeer: initial definition and implementation of new SSH protocol...
sshpeer: initial definition and implementation of new SSH protocol The existing SSH protocol has several design flaws. Future commits will elaborate on these flaws as new features are introduced to combat these flaws. For now, hopefully you can take me for my word that a ground up rewrite of the SSH protocol is needed. This commit lays the foundation for a new SSH protocol by defining a mechanism to upgrade the SSH transport channel away from the default (version 1) protocol to something modern (which we'll call "version 2" for now). This upgrade process is detailed in the internals documentation for the wire protocol. The gist of it is the client sends a request line preceding the "hello" command/line which basically says "I'm requesting an upgrade: here's what I support." If the server recognizes that line, it processes the upgrade request and the transport channel is switched to use the new version of the protocol. If not, it sends an empty response, which is how all Mercurial SSH servers from the beginning of time reacted to unknown commands. The upgrade request is effectively ignored and the client continues to use the existing version of the protocol as if nothing happened. The new version of the SSH protocol is completely identical to version 1 aside from the upgrade dance and the bytes that follow. The immediate bytes that follow the protocol switch are defined to be a length framed "capabilities: " line containing the remote's advertised capabilities. In reality, this looks very similar to what the "hello" response would look like. But it will evolve quickly. The methodology by which the protocol will evolve is important. I'm not going to introduce the new protocol all at once. That would likely lead to endless bike shedding and forward progress would stall. Instead, I intend to tricle out new features and diversions from the existing protocol in small, incremental changes. To support the gradual evolution of the protocol, the on-the-wire advertised protocol name contains an "exp" to denote "experimental" and a 4 digit field to capture the sub-version of the protocol. Whenever we make a BC change to the wire protocol, we can increment this version and lock out all older clients because it will appear as a completely different protocol version. This means we can incur as many breaking changes as we want. We don't have to commit to supporting any one feature or idea for a long period of time. We can even evolve the handshake mechanism, because that is defined as being an implementation detail of the negotiated protocol version! Hopefully this lowers the barrier to accepting changes to the protocol and for experimenting with "radical" ideas during its development. In core, sshpeer received most of the attention. We haven't even implemented the server bits for the new protocol in core yet. Instead, we add very primitive support to our test server, mainly just to exercise the added code paths in sshpeer. Differential Revision: https://phab.mercurial-scm.org/D2061 # no-check-commit because of required foo_bar naming
Denis Laxalde - - Load All Authors

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test-branches.t
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$ hg init a
$ cd a
Verify checking branch of nullrev before the cache is created doesnt crash
$ hg log -r 'branch(.)' -T '{branch}\n'
Basic test
$ echo 'root' >root
$ hg add root
$ hg commit -d '0 0' -m "Adding root node"
$ echo 'a' >a
$ hg add a
$ hg branch a
marked working directory as branch a
(branches are permanent and global, did you want a bookmark?)
$ hg commit -d '1 0' -m "Adding a branch"
$ hg branch q
marked working directory as branch q
$ echo 'aa' >a
$ hg branch -C
reset working directory to branch a
$ hg commit -d '2 0' -m "Adding to a branch"
$ hg update -C 0
0 files updated, 0 files merged, 1 files removed, 0 files unresolved
$ echo 'b' >b
$ hg add b
$ hg branch b
marked working directory as branch b
$ hg commit -d '2 0' -m "Adding b branch"
$ echo 'bh1' >bh1
$ hg add bh1
$ hg commit -d '3 0' -m "Adding b branch head 1"
$ hg update -C 2
1 files updated, 0 files merged, 2 files removed, 0 files unresolved
$ echo 'bh2' >bh2
$ hg add bh2
$ hg commit -d '4 0' -m "Adding b branch head 2"
$ echo 'c' >c
$ hg add c
$ hg branch c
marked working directory as branch c
$ hg commit -d '5 0' -m "Adding c branch"
reserved names
$ hg branch tip
abort: the name 'tip' is reserved
[255]
$ hg branch null
abort: the name 'null' is reserved
[255]
$ hg branch .
abort: the name '.' is reserved
[255]
invalid characters
$ hg branch 'foo:bar'
abort: ':' cannot be used in a name
[255]
$ hg branch 'foo
> bar'
abort: '\n' cannot be used in a name
[255]
trailing or leading spaces should be stripped before testing duplicates
$ hg branch 'b '
abort: a branch of the same name already exists
(use 'hg update' to switch to it)
[255]
$ hg branch ' b'
abort: a branch of the same name already exists
(use 'hg update' to switch to it)
[255]
verify update will accept invalid legacy branch names
$ hg init test-invalid-branch-name
$ cd test-invalid-branch-name
$ hg pull -u "$TESTDIR"/bundles/test-invalid-branch-name.hg
pulling from *test-invalid-branch-name.hg (glob)
requesting all changes
adding changesets
adding manifests
adding file changes
added 3 changesets with 3 changes to 2 files
new changesets f0e4c7f04036:33c2ceb9310b
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ hg update '"colon:test"'
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ cd ..
$ echo 'd' >d
$ hg add d
$ hg branch 'a branch name much longer than the default justification used by branches'
marked working directory as branch a branch name much longer than the default justification used by branches
$ hg commit -d '6 0' -m "Adding d branch"
$ hg branches
a branch name much longer than the default justification used by branches 7:10ff5895aa57
b 4:aee39cd168d0
c 6:589736a22561 (inactive)
a 5:d8cbc61dbaa6 (inactive)
default 0:19709c5a4e75 (inactive)
-------
$ hg branches -a
a branch name much longer than the default justification used by branches 7:10ff5895aa57
b 4:aee39cd168d0
--- Branch a
$ hg log -b a
changeset: 5:d8cbc61dbaa6
branch: a
parent: 2:881fe2b92ad0
user: test
date: Thu Jan 01 00:00:04 1970 +0000
summary: Adding b branch head 2
changeset: 2:881fe2b92ad0
branch: a
user: test
date: Thu Jan 01 00:00:02 1970 +0000
summary: Adding to a branch
changeset: 1:dd6b440dd85a
branch: a
user: test
date: Thu Jan 01 00:00:01 1970 +0000
summary: Adding a branch
---- Branch b
$ hg log -b b
changeset: 4:aee39cd168d0
branch: b
user: test
date: Thu Jan 01 00:00:03 1970 +0000
summary: Adding b branch head 1
changeset: 3:ac22033332d1
branch: b
parent: 0:19709c5a4e75
user: test
date: Thu Jan 01 00:00:02 1970 +0000
summary: Adding b branch
---- going to test branch closing
$ hg branches
a branch name much longer than the default justification used by branches 7:10ff5895aa57
b 4:aee39cd168d0
c 6:589736a22561 (inactive)
a 5:d8cbc61dbaa6 (inactive)
default 0:19709c5a4e75 (inactive)
$ hg up -C b
2 files updated, 0 files merged, 4 files removed, 0 files unresolved
$ echo 'xxx1' >> b
$ hg commit -d '7 0' -m 'adding cset to branch b'
$ hg up -C aee39cd168d0
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ echo 'xxx2' >> b
$ hg commit -d '8 0' -m 'adding head to branch b'
created new head
$ echo 'xxx3' >> b
$ hg commit -d '9 0' -m 'adding another cset to branch b'
$ hg branches
b 10:bfbe841b666e
a branch name much longer than the default justification used by branches 7:10ff5895aa57
c 6:589736a22561 (inactive)
a 5:d8cbc61dbaa6 (inactive)
default 0:19709c5a4e75 (inactive)
$ hg heads --closed
changeset: 10:bfbe841b666e
branch: b
tag: tip
user: test
date: Thu Jan 01 00:00:09 1970 +0000
summary: adding another cset to branch b
changeset: 8:eebb944467c9
branch: b
parent: 4:aee39cd168d0
user: test
date: Thu Jan 01 00:00:07 1970 +0000
summary: adding cset to branch b
changeset: 7:10ff5895aa57
branch: a branch name much longer than the default justification used by branches
user: test
date: Thu Jan 01 00:00:06 1970 +0000
summary: Adding d branch
changeset: 6:589736a22561
branch: c
user: test
date: Thu Jan 01 00:00:05 1970 +0000
summary: Adding c branch
changeset: 5:d8cbc61dbaa6
branch: a
parent: 2:881fe2b92ad0
user: test
date: Thu Jan 01 00:00:04 1970 +0000
summary: Adding b branch head 2
changeset: 0:19709c5a4e75
user: test
date: Thu Jan 01 00:00:00 1970 +0000
summary: Adding root node
$ hg heads
changeset: 10:bfbe841b666e
branch: b
tag: tip
user: test
date: Thu Jan 01 00:00:09 1970 +0000
summary: adding another cset to branch b
changeset: 8:eebb944467c9
branch: b
parent: 4:aee39cd168d0
user: test
date: Thu Jan 01 00:00:07 1970 +0000
summary: adding cset to branch b
changeset: 7:10ff5895aa57
branch: a branch name much longer than the default justification used by branches
user: test
date: Thu Jan 01 00:00:06 1970 +0000
summary: Adding d branch
changeset: 6:589736a22561
branch: c
user: test
date: Thu Jan 01 00:00:05 1970 +0000
summary: Adding c branch
changeset: 5:d8cbc61dbaa6
branch: a
parent: 2:881fe2b92ad0
user: test
date: Thu Jan 01 00:00:04 1970 +0000
summary: Adding b branch head 2
changeset: 0:19709c5a4e75
user: test
date: Thu Jan 01 00:00:00 1970 +0000
summary: Adding root node
$ hg commit -d '9 0' --close-branch -m 'prune bad branch'
$ hg branches -a
b 8:eebb944467c9
a branch name much longer than the default justification used by branches 7:10ff5895aa57
$ hg up -C b
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ hg commit -d '9 0' --close-branch -m 'close this part branch too'
$ hg commit -d '9 0' --close-branch -m 're-closing this branch'
abort: can only close branch heads
[255]
$ hg log -r tip --debug
changeset: 12:e3d49c0575d8fc2cb1cd6859c747c14f5f6d499f
branch: b
tag: tip
phase: draft
parent: 8:eebb944467c9fb9651ed232aeaf31b3c0a7fc6c1
parent: -1:0000000000000000000000000000000000000000
manifest: 8:6f9ed32d2b310e391a4f107d5f0f071df785bfee
user: test
date: Thu Jan 01 00:00:09 1970 +0000
extra: branch=b
extra: close=1
description:
close this part branch too
--- b branch should be inactive
$ hg branches
a branch name much longer than the default justification used by branches 7:10ff5895aa57
c 6:589736a22561 (inactive)
a 5:d8cbc61dbaa6 (inactive)
default 0:19709c5a4e75 (inactive)
$ hg branches -c
a branch name much longer than the default justification used by branches 7:10ff5895aa57
b 12:e3d49c0575d8 (closed)
c 6:589736a22561 (inactive)
a 5:d8cbc61dbaa6 (inactive)
default 0:19709c5a4e75 (inactive)
$ hg branches -a
a branch name much longer than the default justification used by branches 7:10ff5895aa57
$ hg branches -q
a branch name much longer than the default justification used by branches
c
a
default
$ hg heads b
no open branch heads found on branches b
[1]
$ hg heads --closed b
changeset: 12:e3d49c0575d8
branch: b
tag: tip
parent: 8:eebb944467c9
user: test
date: Thu Jan 01 00:00:09 1970 +0000
summary: close this part branch too
changeset: 11:d3f163457ebf
branch: b
user: test
date: Thu Jan 01 00:00:09 1970 +0000
summary: prune bad branch
$ echo 'xxx4' >> b
$ hg commit -d '9 0' -m 'reopen branch with a change'
reopening closed branch head 12
--- branch b is back in action
$ hg branches -a
b 13:e23b5505d1ad
a branch name much longer than the default justification used by branches 7:10ff5895aa57
---- test heads listings
$ hg heads
changeset: 13:e23b5505d1ad
branch: b
tag: tip
user: test
date: Thu Jan 01 00:00:09 1970 +0000
summary: reopen branch with a change
changeset: 7:10ff5895aa57
branch: a branch name much longer than the default justification used by branches
user: test
date: Thu Jan 01 00:00:06 1970 +0000
summary: Adding d branch
changeset: 6:589736a22561
branch: c
user: test
date: Thu Jan 01 00:00:05 1970 +0000
summary: Adding c branch
changeset: 5:d8cbc61dbaa6
branch: a
parent: 2:881fe2b92ad0
user: test
date: Thu Jan 01 00:00:04 1970 +0000
summary: Adding b branch head 2
changeset: 0:19709c5a4e75
user: test
date: Thu Jan 01 00:00:00 1970 +0000
summary: Adding root node
branch default
$ hg heads default
changeset: 0:19709c5a4e75
user: test
date: Thu Jan 01 00:00:00 1970 +0000
summary: Adding root node
branch a
$ hg heads a
changeset: 5:d8cbc61dbaa6
branch: a
parent: 2:881fe2b92ad0
user: test
date: Thu Jan 01 00:00:04 1970 +0000
summary: Adding b branch head 2
$ hg heads --active a
no open branch heads found on branches a
[1]
branch b
$ hg heads b
changeset: 13:e23b5505d1ad
branch: b
tag: tip
user: test
date: Thu Jan 01 00:00:09 1970 +0000
summary: reopen branch with a change
$ hg heads --closed b
changeset: 13:e23b5505d1ad
branch: b
tag: tip
user: test
date: Thu Jan 01 00:00:09 1970 +0000
summary: reopen branch with a change
changeset: 11:d3f163457ebf
branch: b
user: test
date: Thu Jan 01 00:00:09 1970 +0000
summary: prune bad branch
reclose branch
$ hg up -C c
3 files updated, 0 files merged, 2 files removed, 0 files unresolved
$ hg commit -d '9 0' --close-branch -m 'reclosing this branch'
$ hg branches
b 13:e23b5505d1ad
a branch name much longer than the default justification used by branches 7:10ff5895aa57
a 5:d8cbc61dbaa6 (inactive)
default 0:19709c5a4e75 (inactive)
$ hg branches --closed
b 13:e23b5505d1ad
a branch name much longer than the default justification used by branches 7:10ff5895aa57
c 14:f894c25619d3 (closed)
a 5:d8cbc61dbaa6 (inactive)
default 0:19709c5a4e75 (inactive)
multihead branch
$ hg up -C default
0 files updated, 0 files merged, 3 files removed, 0 files unresolved
$ hg branch m
marked working directory as branch m
$ touch m
$ hg add m
$ hg commit -d '10 0' -m 'multihead base'
$ echo "m1" >m
$ hg commit -d '10 0' -m 'head 1'
$ hg up -C '.^'
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ echo "m2" >m
$ hg commit -d '10 0' -m 'head 2'
created new head
$ hg log -b m
changeset: 17:df343b0df04f
branch: m
tag: tip
parent: 15:f3447637f53e
user: test
date: Thu Jan 01 00:00:10 1970 +0000
summary: head 2
changeset: 16:a58ca5d3bdf3
branch: m
user: test
date: Thu Jan 01 00:00:10 1970 +0000
summary: head 1
changeset: 15:f3447637f53e
branch: m
parent: 0:19709c5a4e75
user: test
date: Thu Jan 01 00:00:10 1970 +0000
summary: multihead base
$ hg heads --topo m
changeset: 17:df343b0df04f
branch: m
tag: tip
parent: 15:f3447637f53e
user: test
date: Thu Jan 01 00:00:10 1970 +0000
summary: head 2
changeset: 16:a58ca5d3bdf3
branch: m
user: test
date: Thu Jan 01 00:00:10 1970 +0000
summary: head 1
$ hg branches
m 17:df343b0df04f
b 13:e23b5505d1ad
a branch name much longer than the default justification used by branches 7:10ff5895aa57
a 5:d8cbc61dbaa6 (inactive)
default 0:19709c5a4e75 (inactive)
partially merge multihead branch
$ hg up -C default
0 files updated, 0 files merged, 1 files removed, 0 files unresolved
$ hg branch md
marked working directory as branch md
$ hg merge m
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
(branch merge, don't forget to commit)
$ hg commit -d '11 0' -m 'merge head 2'
$ hg heads --topo m
changeset: 16:a58ca5d3bdf3
branch: m
user: test
date: Thu Jan 01 00:00:10 1970 +0000
summary: head 1
$ hg branches
md 18:c914c99f1fbb
m 17:df343b0df04f
b 13:e23b5505d1ad
a branch name much longer than the default justification used by branches 7:10ff5895aa57
a 5:d8cbc61dbaa6 (inactive)
default 0:19709c5a4e75 (inactive)
partially close multihead branch
$ hg up -C a58ca5d3bdf3
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ hg commit -d '12 0' -m 'close head 1' --close-branch
$ hg heads --topo m
changeset: 19:cd21a80baa3d
branch: m
tag: tip
parent: 16:a58ca5d3bdf3
user: test
date: Thu Jan 01 00:00:12 1970 +0000
summary: close head 1
$ hg branches
md 18:c914c99f1fbb
b 13:e23b5505d1ad
a branch name much longer than the default justification used by branches 7:10ff5895aa57
m 17:df343b0df04f (inactive)
a 5:d8cbc61dbaa6 (inactive)
default 0:19709c5a4e75 (inactive)
default branch colors:
$ cat <<EOF >> $HGRCPATH
> [extensions]
> color =
> [color]
> mode = ansi
> EOF
$ hg up -C b
2 files updated, 0 files merged, 1 files removed, 0 files unresolved
$ hg branches --color=always
\x1b[0;0mmd\x1b[0m\x1b[0;33m 18:c914c99f1fbb\x1b[0m (esc)
\x1b[0;32mb\x1b[0m\x1b[0;33m 13:e23b5505d1ad\x1b[0m (esc)
\x1b[0;0ma branch name much longer than the default justification used by branches\x1b[0m\x1b[0;33m 7:10ff5895aa57\x1b[0m (esc)
\x1b[0;0mm\x1b[0m\x1b[0;33m 17:df343b0df04f\x1b[0m (inactive) (esc)
\x1b[0;0ma\x1b[0m\x1b[0;33m 5:d8cbc61dbaa6\x1b[0m (inactive) (esc)
\x1b[0;0mdefault\x1b[0m\x1b[0;33m 0:19709c5a4e75\x1b[0m (inactive) (esc)
default closed branch color:
$ hg branches --color=always --closed
\x1b[0;0mmd\x1b[0m\x1b[0;33m 18:c914c99f1fbb\x1b[0m (esc)
\x1b[0;32mb\x1b[0m\x1b[0;33m 13:e23b5505d1ad\x1b[0m (esc)
\x1b[0;0ma branch name much longer than the default justification used by branches\x1b[0m\x1b[0;33m 7:10ff5895aa57\x1b[0m (esc)
\x1b[0;0mm\x1b[0m\x1b[0;33m 17:df343b0df04f\x1b[0m (inactive) (esc)
\x1b[0;30;1mc\x1b[0m\x1b[0;33m 14:f894c25619d3\x1b[0m (closed) (esc)
\x1b[0;0ma\x1b[0m\x1b[0;33m 5:d8cbc61dbaa6\x1b[0m (inactive) (esc)
\x1b[0;0mdefault\x1b[0m\x1b[0;33m 0:19709c5a4e75\x1b[0m (inactive) (esc)
$ cat <<EOF >> $HGRCPATH
> [extensions]
> color =
> [color]
> branches.active = green
> branches.closed = blue
> branches.current = red
> branches.inactive = magenta
> log.changeset = cyan
> EOF
custom branch colors:
$ hg branches --color=always
\x1b[0;32mmd\x1b[0m\x1b[0;36m 18:c914c99f1fbb\x1b[0m (esc)
\x1b[0;31mb\x1b[0m\x1b[0;36m 13:e23b5505d1ad\x1b[0m (esc)
\x1b[0;32ma branch name much longer than the default justification used by branches\x1b[0m\x1b[0;36m 7:10ff5895aa57\x1b[0m (esc)
\x1b[0;35mm\x1b[0m\x1b[0;36m 17:df343b0df04f\x1b[0m (inactive) (esc)
\x1b[0;35ma\x1b[0m\x1b[0;36m 5:d8cbc61dbaa6\x1b[0m (inactive) (esc)
\x1b[0;35mdefault\x1b[0m\x1b[0;36m 0:19709c5a4e75\x1b[0m (inactive) (esc)
custom closed branch color:
$ hg branches --color=always --closed
\x1b[0;32mmd\x1b[0m\x1b[0;36m 18:c914c99f1fbb\x1b[0m (esc)
\x1b[0;31mb\x1b[0m\x1b[0;36m 13:e23b5505d1ad\x1b[0m (esc)
\x1b[0;32ma branch name much longer than the default justification used by branches\x1b[0m\x1b[0;36m 7:10ff5895aa57\x1b[0m (esc)
\x1b[0;35mm\x1b[0m\x1b[0;36m 17:df343b0df04f\x1b[0m (inactive) (esc)
\x1b[0;34mc\x1b[0m\x1b[0;36m 14:f894c25619d3\x1b[0m (closed) (esc)
\x1b[0;35ma\x1b[0m\x1b[0;36m 5:d8cbc61dbaa6\x1b[0m (inactive) (esc)
\x1b[0;35mdefault\x1b[0m\x1b[0;36m 0:19709c5a4e75\x1b[0m (inactive) (esc)
template output:
$ hg branches -Tjson --closed
[
{
"active": true,
"branch": "md",
"closed": false,
"current": false,
"node": "c914c99f1fbb2b1d785a0a939ed3f67275df18e9",
"rev": 18
},
{
"active": true,
"branch": "b",
"closed": false,
"current": true,
"node": "e23b5505d1ad24aab6f84fd8c7cb8cd8e5e93be0",
"rev": 13
},
{
"active": true,
"branch": "a branch name much longer than the default justification used by branches",
"closed": false,
"current": false,
"node": "10ff5895aa5793bd378da574af8cec8ea408d831",
"rev": 7
},
{
"active": false,
"branch": "m",
"closed": false,
"current": false,
"node": "df343b0df04feb2a946cd4b6e9520e552fef14ee",
"rev": 17
},
{
"active": false,
"branch": "c",
"closed": true,
"current": false,
"node": "f894c25619d3f1484639d81be950e0a07bc6f1f6",
"rev": 14
},
{
"active": false,
"branch": "a",
"closed": false,
"current": false,
"node": "d8cbc61dbaa6dc817175d1e301eecb863f280832",
"rev": 5
},
{
"active": false,
"branch": "default",
"closed": false,
"current": false,
"node": "19709c5a4e75bf938f8e349aff97438539bb729e",
"rev": 0
}
]
$ hg branches --closed -T '{if(closed, "{branch}\n")}'
c
$ hg branches -T '{word(0, branch)}: {desc|firstline}\n'
md: merge head 2
b: reopen branch with a change
a: Adding d branch
m: head 2
a: Adding b branch head 2
default: Adding root node
$ cat <<'EOF' > "$TESTTMP/map-myjson"
> docheader = '\{\n'
> docfooter = '\n}\n'
> separator = ',\n'
> branches = ' {dict(branch, node|short)|json}'
> EOF
$ hg branches -T "$TESTTMP/map-myjson"
{
{"branch": "md", "node": "c914c99f1fbb"},
{"branch": "b", "node": "e23b5505d1ad"},
{"branch": "a branch *", "node": "10ff5895aa57"}, (glob)
{"branch": "m", "node": "df343b0df04f"},
{"branch": "a", "node": "d8cbc61dbaa6"},
{"branch": "default", "node": "19709c5a4e75"}
}
$ cat <<'EOF' >> .hg/hgrc
> [templates]
> myjson = ' {dict(branch, node|short)|json}'
> myjson:docheader = '\{\n'
> myjson:docfooter = '\n}\n'
> myjson:separator = ',\n'
> EOF
$ hg branches -T myjson
{
{"branch": "md", "node": "c914c99f1fbb"},
{"branch": "b", "node": "e23b5505d1ad"},
{"branch": "a branch *", "node": "10ff5895aa57"}, (glob)
{"branch": "m", "node": "df343b0df04f"},
{"branch": "a", "node": "d8cbc61dbaa6"},
{"branch": "default", "node": "19709c5a4e75"}
}
$ cat <<'EOF' >> .hg/hgrc
> [templates]
> :docheader = 'should not be selected as a docheader for literal templates\n'
> EOF
$ hg branches -T '{branch}\n'
md
b
a branch name much longer than the default justification used by branches
m
a
default
Tests of revision branch name caching
We rev branch cache is updated automatically. In these tests we use a trick to
trigger rebuilds. We remove the branch head cache and run 'hg head' to cause a
rebuild that also will populate the rev branch cache.
revision branch cache is created when building the branch head cache
$ rm -rf .hg/cache; hg head a -T '{rev}\n'
5
$ f --hexdump --size .hg/cache/rbc-*
.hg/cache/rbc-names-v1: size=92
0000: 64 65 66 61 75 6c 74 00 61 00 62 00 63 00 61 20 |default.a.b.c.a |
0010: 62 72 61 6e 63 68 20 6e 61 6d 65 20 6d 75 63 68 |branch name much|
0020: 20 6c 6f 6e 67 65 72 20 74 68 61 6e 20 74 68 65 | longer than the|
0030: 20 64 65 66 61 75 6c 74 20 6a 75 73 74 69 66 69 | default justifi|
0040: 63 61 74 69 6f 6e 20 75 73 65 64 20 62 79 20 62 |cation used by b|
0050: 72 61 6e 63 68 65 73 00 6d 00 6d 64 |ranches.m.md|
.hg/cache/rbc-revs-v1: size=160
0000: 19 70 9c 5a 00 00 00 00 dd 6b 44 0d 00 00 00 01 |.p.Z.....kD.....|
0010: 88 1f e2 b9 00 00 00 01 ac 22 03 33 00 00 00 02 |.........".3....|
0020: ae e3 9c d1 00 00 00 02 d8 cb c6 1d 00 00 00 01 |................|
0030: 58 97 36 a2 00 00 00 03 10 ff 58 95 00 00 00 04 |X.6.......X.....|
0040: ee bb 94 44 00 00 00 02 5f 40 61 bb 00 00 00 02 |...D...._@a.....|
0050: bf be 84 1b 00 00 00 02 d3 f1 63 45 80 00 00 02 |..........cE....|
0060: e3 d4 9c 05 80 00 00 02 e2 3b 55 05 00 00 00 02 |.........;U.....|
0070: f8 94 c2 56 80 00 00 03 f3 44 76 37 00 00 00 05 |...V.....Dv7....|
0080: a5 8c a5 d3 00 00 00 05 df 34 3b 0d 00 00 00 05 |.........4;.....|
0090: c9 14 c9 9f 00 00 00 06 cd 21 a8 0b 80 00 00 05 |.........!......|
no errors when revbranchcache is not writable
$ echo >> .hg/cache/rbc-revs-v1
$ mv .hg/cache/rbc-revs-v1 .hg/cache/rbc-revs-v1_
$ mkdir .hg/cache/rbc-revs-v1
$ rm -f .hg/cache/branch* && hg head a -T '{rev}\n'
5
$ rmdir .hg/cache/rbc-revs-v1
$ mv .hg/cache/rbc-revs-v1_ .hg/cache/rbc-revs-v1
no errors when wlock cannot be acquired
#if unix-permissions
$ mv .hg/cache/rbc-revs-v1 .hg/cache/rbc-revs-v1_
$ rm -f .hg/cache/branch*
$ chmod 555 .hg
$ hg head a -T '{rev}\n'
5
$ chmod 755 .hg
$ mv .hg/cache/rbc-revs-v1_ .hg/cache/rbc-revs-v1
#endif
recovery from invalid cache revs file with trailing data
$ echo >> .hg/cache/rbc-revs-v1
$ rm -f .hg/cache/branch* && hg head a -T '{rev}\n' --debug
5
truncating cache/rbc-revs-v1 to 160
$ f --size .hg/cache/rbc-revs*
.hg/cache/rbc-revs-v1: size=160
recovery from invalid cache file with partial last record
$ mv .hg/cache/rbc-revs-v1 .
$ f -qDB 119 rbc-revs-v1 > .hg/cache/rbc-revs-v1
$ f --size .hg/cache/rbc-revs*
.hg/cache/rbc-revs-v1: size=119
$ rm -f .hg/cache/branch* && hg head a -T '{rev}\n' --debug
5
truncating cache/rbc-revs-v1 to 112
$ f --size .hg/cache/rbc-revs*
.hg/cache/rbc-revs-v1: size=160
recovery from invalid cache file with missing record - no truncation
$ mv .hg/cache/rbc-revs-v1 .
$ f -qDB 112 rbc-revs-v1 > .hg/cache/rbc-revs-v1
$ rm -f .hg/cache/branch* && hg head a -T '{rev}\n' --debug
5
$ f --size .hg/cache/rbc-revs*
.hg/cache/rbc-revs-v1: size=160
recovery from invalid cache file with some bad records
$ mv .hg/cache/rbc-revs-v1 .
$ f -qDB 8 rbc-revs-v1 > .hg/cache/rbc-revs-v1
$ f --size .hg/cache/rbc-revs*
.hg/cache/rbc-revs-v1: size=8
$ f -qDB 112 rbc-revs-v1 >> .hg/cache/rbc-revs-v1
$ f --size .hg/cache/rbc-revs*
.hg/cache/rbc-revs-v1: size=120
$ hg log -r 'branch(.)' -T '{rev} ' --debug
history modification detected - truncating revision branch cache to revision 13
history modification detected - truncating revision branch cache to revision 1
3 4 8 9 10 11 12 13 truncating cache/rbc-revs-v1 to 8
$ rm -f .hg/cache/branch* && hg head a -T '{rev}\n' --debug
5
truncating cache/rbc-revs-v1 to 104
$ f --size --hexdump --bytes=16 .hg/cache/rbc-revs*
.hg/cache/rbc-revs-v1: size=160
0000: 19 70 9c 5a 00 00 00 00 dd 6b 44 0d 00 00 00 01 |.p.Z.....kD.....|
cache is updated when committing
$ hg branch i-will-regret-this
marked working directory as branch i-will-regret-this
$ hg ci -m regrets
$ f --size .hg/cache/rbc-*
.hg/cache/rbc-names-v1: size=111
.hg/cache/rbc-revs-v1: size=168
update after rollback - the cache will be correct but rbc-names will will still
contain the branch name even though it no longer is used
$ hg up -qr '.^'
$ hg rollback -qf
$ f --size --hexdump .hg/cache/rbc-*
.hg/cache/rbc-names-v1: size=111
0000: 64 65 66 61 75 6c 74 00 61 00 62 00 63 00 61 20 |default.a.b.c.a |
0010: 62 72 61 6e 63 68 20 6e 61 6d 65 20 6d 75 63 68 |branch name much|
0020: 20 6c 6f 6e 67 65 72 20 74 68 61 6e 20 74 68 65 | longer than the|
0030: 20 64 65 66 61 75 6c 74 20 6a 75 73 74 69 66 69 | default justifi|
0040: 63 61 74 69 6f 6e 20 75 73 65 64 20 62 79 20 62 |cation used by b|
0050: 72 61 6e 63 68 65 73 00 6d 00 6d 64 00 69 2d 77 |ranches.m.md.i-w|
0060: 69 6c 6c 2d 72 65 67 72 65 74 2d 74 68 69 73 |ill-regret-this|
.hg/cache/rbc-revs-v1: size=160
0000: 19 70 9c 5a 00 00 00 00 dd 6b 44 0d 00 00 00 01 |.p.Z.....kD.....|
0010: 88 1f e2 b9 00 00 00 01 ac 22 03 33 00 00 00 02 |.........".3....|
0020: ae e3 9c d1 00 00 00 02 d8 cb c6 1d 00 00 00 01 |................|
0030: 58 97 36 a2 00 00 00 03 10 ff 58 95 00 00 00 04 |X.6.......X.....|
0040: ee bb 94 44 00 00 00 02 5f 40 61 bb 00 00 00 02 |...D...._@a.....|
0050: bf be 84 1b 00 00 00 02 d3 f1 63 45 80 00 00 02 |..........cE....|
0060: e3 d4 9c 05 80 00 00 02 e2 3b 55 05 00 00 00 02 |.........;U.....|
0070: f8 94 c2 56 80 00 00 03 f3 44 76 37 00 00 00 05 |...V.....Dv7....|
0080: a5 8c a5 d3 00 00 00 05 df 34 3b 0d 00 00 00 05 |.........4;.....|
0090: c9 14 c9 9f 00 00 00 06 cd 21 a8 0b 80 00 00 05 |.........!......|
cache is updated/truncated when stripping - it is thus very hard to get in a
situation where the cache is out of sync and the hash check detects it
$ hg --config extensions.strip= strip -r tip --nob
$ f --size .hg/cache/rbc-revs*
.hg/cache/rbc-revs-v1: size=152
cache is rebuilt when corruption is detected
$ echo > .hg/cache/rbc-names-v1
$ hg log -r '5:&branch(.)' -T '{rev} ' --debug
referenced branch names not found - rebuilding revision branch cache from scratch
8 9 10 11 12 13 truncating cache/rbc-revs-v1 to 40
$ f --size --hexdump .hg/cache/rbc-*
.hg/cache/rbc-names-v1: size=84
0000: 62 00 61 00 63 00 61 20 62 72 61 6e 63 68 20 6e |b.a.c.a branch n|
0010: 61 6d 65 20 6d 75 63 68 20 6c 6f 6e 67 65 72 20 |ame much longer |
0020: 74 68 61 6e 20 74 68 65 20 64 65 66 61 75 6c 74 |than the default|
0030: 20 6a 75 73 74 69 66 69 63 61 74 69 6f 6e 20 75 | justification u|
0040: 73 65 64 20 62 79 20 62 72 61 6e 63 68 65 73 00 |sed by branches.|
0050: 6d 00 6d 64 |m.md|
.hg/cache/rbc-revs-v1: size=152
0000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
0010: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
0020: 00 00 00 00 00 00 00 00 d8 cb c6 1d 00 00 00 01 |................|
0030: 58 97 36 a2 00 00 00 02 10 ff 58 95 00 00 00 03 |X.6.......X.....|
0040: ee bb 94 44 00 00 00 00 5f 40 61 bb 00 00 00 00 |...D...._@a.....|
0050: bf be 84 1b 00 00 00 00 d3 f1 63 45 80 00 00 00 |..........cE....|
0060: e3 d4 9c 05 80 00 00 00 e2 3b 55 05 00 00 00 00 |.........;U.....|
0070: f8 94 c2 56 80 00 00 02 f3 44 76 37 00 00 00 04 |...V.....Dv7....|
0080: a5 8c a5 d3 00 00 00 04 df 34 3b 0d 00 00 00 04 |.........4;.....|
0090: c9 14 c9 9f 00 00 00 05 |........|
Test that cache files are created and grows correctly:
$ rm .hg/cache/rbc*
$ hg log -r "5 & branch(5)" -T "{rev}\n"
5
$ f --size --hexdump .hg/cache/rbc-*
.hg/cache/rbc-names-v1: size=1
0000: 61 |a|
.hg/cache/rbc-revs-v1: size=152
0000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
0010: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
0020: 00 00 00 00 00 00 00 00 d8 cb c6 1d 00 00 00 00 |................|
0030: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
0040: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
0050: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
0060: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
0070: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
0080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
0090: 00 00 00 00 00 00 00 00 |........|
$ cd ..
Test for multiple incorrect branch cache entries:
$ hg init b
$ cd b
$ touch f
$ hg ci -Aqmf
$ echo >> f
$ hg ci -Amf
$ hg branch -q branch
$ hg ci -Amf
$ f --size --hexdump .hg/cache/rbc-*
.hg/cache/rbc-names-v1: size=14
0000: 64 65 66 61 75 6c 74 00 62 72 61 6e 63 68 |default.branch|
.hg/cache/rbc-revs-v1: size=24
0000: 66 e5 f5 aa 00 00 00 00 fa 4c 04 e5 00 00 00 00 |f........L......|
0010: 56 46 78 69 00 00 00 01 |VFxi....|
$ : > .hg/cache/rbc-revs-v1
No superfluous rebuilding of cache:
$ hg log -r "branch(null)&branch(branch)" --debug
$ f --size --hexdump .hg/cache/rbc-*
.hg/cache/rbc-names-v1: size=14
0000: 64 65 66 61 75 6c 74 00 62 72 61 6e 63 68 |default.branch|
.hg/cache/rbc-revs-v1: size=24
0000: 66 e5 f5 aa 00 00 00 00 fa 4c 04 e5 00 00 00 00 |f........L......|
0010: 56 46 78 69 00 00 00 01 |VFxi....|
$ cd ..