rust-changelog: remove special parsing of empty changelog data for null rev
For the null revision, `Revlog::get_rev_data()` will return an empty
string (of bytes). We currently handle that case in
`ChangelogRevisionData::manifest_node()`. However, it's going to be
ugly to have special handling for the null revision for each future
method on `ChangelogRevisionData`. This patch therefore restructures
the code so we instead initialize the struct with valid data for the
null revision.
Differential Revision: https://phab.mercurial-scm.org/D12438
Create a repository:
#if no-extraextensions
$ hg config
chgserver.idletimeout=60
devel.all-warnings=true
devel.default-date=0 0
extensions.fsmonitor= (fsmonitor !)
format.use-dirstate-v2=1 (dirstate-v2 !)
largefiles.usercache=$TESTTMP/.cache/largefiles
lfs.usercache=$TESTTMP/.cache/lfs
ui.slash=True
ui.interactive=False
ui.detailed-exit-code=True
ui.merge=internal:merge
ui.mergemarkers=detailed
ui.promptecho=True
ui.ssh=* (glob)
ui.timeout.warn=15
web.address=localhost
web\.ipv6=(?:True|False) (re)
web.server-header=testing stub value
#endif
$ hg init t
$ cd t
Prepare a changeset:
$ echo a > a
$ hg add a
$ hg status
A a
Writes to stdio succeed and fail appropriately
#if devfull
$ hg status 2>/dev/full
A a
$ hg status >/dev/full
abort: No space left on device* (glob)
[255]
#endif
#if devfull
$ hg status >/dev/full 2>&1
[255]
$ hg status ENOENT 2>/dev/full
[255]
#endif
On Python 3, stdio may be None:
$ hg debuguiprompt --config ui.interactive=true 0<&-
abort: Bad file descriptor (no-rhg !)
abort: response expected (rhg !)
[255]
$ hg version -q 0<&-
Mercurial Distributed SCM * (glob)
#if py3 no-rhg
$ hg version -q 1>&-
abort: Bad file descriptor
[255]
#else
$ hg version -q 1>&-
#endif
$ hg unknown -q 1>&-
hg: unknown command 'unknown'
(did you mean debugknown?)
[10]
$ hg version -q 2>&-
Mercurial Distributed SCM * (glob)
$ hg unknown -q 2>&-
[10]
$ hg commit -m test
This command is ancient:
$ hg history
changeset: 0:acb14030fe0a
tag: tip
user: test
date: Thu Jan 01 00:00:00 1970 +0000
summary: test
Verify that updating to revision 0 via commands.update() works properly
$ cat <<EOF > update_to_rev0.py
> from mercurial import commands, hg, ui as uimod
> myui = uimod.ui.load()
> repo = hg.repository(myui, path=b'.')
> commands.update(myui, repo, rev=b"0")
> EOF
$ hg up null
0 files updated, 0 files merged, 1 files removed, 0 files unresolved
$ "$PYTHON" ./update_to_rev0.py
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ hg identify -n
0
Poke around at hashes:
$ hg manifest --debug
b789fdd96dc2f3bd229c1dd8eedf0fc60e2b68e3 644 a
$ hg cat a
a
Verify should succeed:
$ hg verify
checking changesets
checking manifests
crosschecking files in changesets and manifests
checking files
checked 1 changesets with 1 changes to 1 files
Repository root:
$ hg root
$TESTTMP/t
$ hg log -l1 -T '{reporoot}\n'
$TESTTMP/t
$ hg root -Tjson | sed 's|\\\\|\\|g'
[
{
"hgpath": "$TESTTMP/t/.hg",
"reporoot": "$TESTTMP/t",
"storepath": "$TESTTMP/t/.hg/store"
}
]
At the end...
$ cd ..
Status message redirection:
$ hg init empty
status messages are sent to stdout by default:
$ hg outgoing -R t empty -Tjson 2>/dev/null
comparing with empty
searching for changes
[
{
"bookmarks": [],
"branch": "default",
"date": [0, 0],
"desc": "test",
"node": "acb14030fe0a21b60322c440ad2d20cf7685a376",
"parents": ["0000000000000000000000000000000000000000"],
"phase": "draft",
"rev": 0,
"tags": ["tip"],
"user": "test"
}
]
which can be configured to send to stderr, so the output wouldn't be
interleaved:
$ cat <<'EOF' >> "$HGRCPATH"
> [ui]
> message-output = stderr
> EOF
$ hg outgoing -R t empty -Tjson 2>/dev/null
[
{
"bookmarks": [],
"branch": "default",
"date": [0, 0],
"desc": "test",
"node": "acb14030fe0a21b60322c440ad2d20cf7685a376",
"parents": ["0000000000000000000000000000000000000000"],
"phase": "draft",
"rev": 0,
"tags": ["tip"],
"user": "test"
}
]
$ hg outgoing -R t empty -Tjson >/dev/null
comparing with empty
searching for changes
this option should be turned off by HGPLAIN= since it may break scripting use:
$ HGPLAIN= hg outgoing -R t empty -Tjson 2>/dev/null
comparing with empty
searching for changes
[
{
"bookmarks": [],
"branch": "default",
"date": [0, 0],
"desc": "test",
"node": "acb14030fe0a21b60322c440ad2d20cf7685a376",
"parents": ["0000000000000000000000000000000000000000"],
"phase": "draft",
"rev": 0,
"tags": ["tip"],
"user": "test"
}
]
but still overridden by --config:
$ HGPLAIN= hg outgoing -R t empty -Tjson --config ui.message-output=stderr \
> 2>/dev/null
[
{
"bookmarks": [],
"branch": "default",
"date": [0, 0],
"desc": "test",
"node": "acb14030fe0a21b60322c440ad2d20cf7685a376",
"parents": ["0000000000000000000000000000000000000000"],
"phase": "draft",
"rev": 0,
"tags": ["tip"],
"user": "test"
}
]
Invalid ui.message-output option:
$ hg log -R t --config ui.message-output=bad
abort: invalid ui.message-output destination: bad
[255]
Underlying message streams should be updated when ui.fout/ferr are set:
$ cat <<'EOF' > capui.py
> import io
> from mercurial import registrar
> cmdtable = {}
> command = registrar.command(cmdtable)
> @command(b'capui', norepo=True)
> def capui(ui):
> out = ui.fout
> ui.fout = io.BytesIO()
> ui.status(b'status\n')
> ui.ferr = io.BytesIO()
> ui.warn(b'warn\n')
> out.write(b'stdout: %s' % ui.fout.getvalue())
> out.write(b'stderr: %s' % ui.ferr.getvalue())
> EOF
$ hg --config extensions.capui=capui.py --config ui.message-output=stdio capui
stdout: status
stderr: warn