Now that we store and display merge labels in user prompts (not just
conflict markets), we should rely on labels to clarify the two sides of a
merge operation (hg merge, hg update, hg rebase etc).
"remote" is not a great name here, as it conflates "remote" as in "remote
server" with "remote" as in "the side of the merge that's further away". In
cases where you're merging the "wrong way" around, remote can even be the
"local" commit that you're merging with something pulled from the remote
server.
Now that we persist the labels, we can consistently use the labels in
prompts for the user without risk of confusion. This changes a huge amount
of command output:
This means that merge prompts like:
no tool found to merge a
keep (l)ocal, take (o)ther, or leave (u)nresolved? u
and
remote changed a which local deleted
use (c)hanged version, leave (d)eleted, or leave (u)nresolved? c
become:
no tool found to merge a
keep (l)ocal [working copy], take (o)ther [destination], or leave (u)nresolved? u
and
remote [source] changed a which local [dest] deleted
use (c)hanged version, leave (d)eleted, or leave (u)nresolved? c
where "working copy" and "destination" were supplied by the command that
requested the merge as labels for conflict markers, and thus should be
human-friendly.
Initializing a subrepo when one doesn't exist is the right thing to do when the
parent is being updated, but in few other cases. Unfortunately, there isn't
enough context in the subrepo module to distinguish this case. This same issue
can be caused with other subrepo aware commands, so there is a general issue
here beyond the scope of this fix.
A simpler attempt I tried was to add an '_updating' boolean to localrepo, and
set/clear it around the call to mergemod.update() in hg.updaterepo(). That
mostly worked, but doesn't handle the case where archive will clone the subrepo
if it is missing. (I vaguely recall that there may be other commands that will
clone if needed like this, but certainly not all do. It seems both handy, and a
bit surprising for what should be a read only operation. It might be nice if
all commands did this consistently, but we probably need Angel's subrepo caching
first, to not make a mess of the working directory.)
I originally handled 'Exception' in order to pick up the Aborts raised in
subrepo.state(), but this turns out to be unnecessary because that is called
once and cached by ctx.sub() when iterating the subrepos.
It was suggested in the bug discussion to skip looking at the subrepo links
unless -S is specified. I don't really like that idea because missing a subrepo
or (less likely, but worse) a corrupt .hgsubstate is a problem of the parent
repo when checking out a revision. The -S option seems like a better fit for
functionality that would recurse into each subrepo and do a full verification.
Ultimately, the default value for 'allowcreate' should probably be flipped, but
since the default behavior was to allow creation, this is less risky for now.
While hopefully atypical, there are reasons that a subrepository revision can be
lost that aren't covered by corruption of the .hgsubstate revlog. Such things
can happen when a subrepo is amended, stripped or simply isn't pulled from
upstream because the parent repo revision wasn't updated yet. There's no way to
know if it is an error, but this will find potential problems sooner than when
some random revision is updated.
Until recently, convert made no attempt at rewriting the .hgsubstate file. The
impetuous for this is to verify the conversion of some repositories, and this is
orders of magnitude faster than a bash script from 0..tip that does an
'hg update -C $rev'. But it is equally useful to determine if everything has
been pulled down before taking a thumb drive on the go.
It feels somewhat wrong to leave this out of verifymod (mostly because the file
is already read in there, and the final summary is printed before the subrepos
are checked). But verifymod looks very low level, so importing subrepo stuff
there seems more wrong.
With many commands accepting a '-S' or an explicit path to trigger recursing
into subrepos, it seems that --hidden needs to be propagated too.
Unfortunately, many of the subrepo layer methods discard the options map, so
passing the option along explicitly isn't currently an option. It also isn't
clear if other filtered views need to be propagated, so changing all of those
commands may be insufficient anyway.
The specific jam I got into was amending an ancestor of qbase in a subrepo, and
then evolving. The patch ended up being hidden, and outgoing said it would only
push one unrelated commit. But push aborted with an 'unknown revision' that I
traced back to the patch. (Odd it didn't say 'filtered revision'.) A push with
--hidden worked from the subrepo, but that wasn't possible from the parent repo
before this.
Since the underlying problem doesn't actually require a subrepo, there's
probably more to investigate here in the discovery area. Yes, evolve + mq is
not exactly sane, but I don't know what is seeing the hidden revision.
In lieu of creating a test for the above situation (evolving mq should probably
be blocked), the test here is a marginally useful case where --hidden is needed
in a subrepo: cat'ing a file in a hidden revision. Without this change, cat
aborts with:
$ hg --hidden cat subrepo/a
skipping missing subrepository: subrepo
[1]
It isn't obvious which file is the problem with deep subrepos, so provide the
path. Since the parsing is done with a ctx and not a subrepo object, it isn't
possible to display a path from the root subrepo. Therefore, the path shown is
relative to cwd.
There's no test coverage for the first abort, and I couldn't figure out how to
trigger it, but it is changed for consistency.
The obsolete._enabled flag has become a config option. This updates all but one
of the tests to use the minimal number of flags necessary for them to pass. For
most tests this is just 'createmarkers', for a couple tests it's
'allowunstable', and for even fewer it's 'exchange'.
When a subrepo revision was hidden it was considered missing and mercurial was
unable to update to the corresponding parent revision. Instead warn the user of
the problem and let it choose what to do (the default is to udpate anyway).
Many tests didn't change back from subdirectories at the end of the tests ...
and they don't have to. The missing 'cd ..' could always be added when another
test case is added to the test file.
This change do that tests (99.5%) consistently end up in $TESTDIR where they
started, thus making it simpler to extend them or move them around.
Note that aborting in subrepo.state() prevents "repairing" commands like revert
to be issued. The user will have to edit the .hgsubstate manually (but he
probably had already otherwise this would not be failing). The same behaviour
already happens with invalid .hgsub entries.
When the contents of .hgsubstate are stale (either because they've
manually been tweaked or partial updates have confused it), we get
confused about whether it actually needs committing.
So instead, we actively consult the parent's substate and compare it
the actual current state when deciding whether it needs committing.
Side effect: lots of "committing subrepo" messages that didn't
correspond with real commits disappear.
This change is fairly invasive for a fairly obscure condition, so it's
kept on the default branch.
