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David Turner's patch to return "ambiguous" seems like a reasonable
patch for future versions of git:
https://public-inbox.org/git/672a6fb9e480becbfcb5df23ae37193784811b6b.camel@novalis.org/
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Ambiguity is not worth it for internal usage with the
solver.
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This will be useful for disambiguating short OIDs in older
emails when abbreviations were shorter.
Tested against the following script with /path/to/git.git
==> t.perl <==
use strict;
use PublicInbox::Git;
use Data::Dumper;
my $dir = shift or die "Usage: $0 GIT_DIR # (of git.git)";
my $git = PublicInbox::Git->new($dir);
my @res = $git->check('dead');
print Dumper({res => \@res, err=> $git->last_check_err});
@res = $git->check('5335669531d83d7d6c905bcfca9b5f8e182dc4d4');
print Dumper({res => \@res, err=> $git->last_check_err});
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It'll be helpful for displaying progress in SolverGit
output.
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For redundancy and centralization resistance.
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This will lookup git blobs from associated git source code
repositories. If the blobs can't be found, an attempt to
"solve" them via patch application will be performed.
Eventually, this may become the basis of a type-agnostic
frontend similar to "git show"
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We need to work with 0x22 (double-quote) and 0x5c (backslash);
even if they're oddball characters in filenames which wouldn't
be used by projects I'd want to work on.
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This function doesn't have a lot of callers at the moment so
none of them are affected by this change. But the plan is to
use this in our WWW code for things, so do it now before we
call it in more places.
Results from a Thinkpad X200 with a Core2Duo P8600 @ 2.4GHz:
Benchmark: timing 10 iterations of cp, ip...
cp: 12.868 wallclock secs (12.86 usr + 0.00 sys = 12.86 CPU) @ 0.78/s (n=10)
ip: 10.9137 wallclock secs (10.91 usr + 0.00 sys = 10.91 CPU) @ 0.92/s (n=10)
Note: I mainly care about unquoted performance because
that's the common case for the target audience of public-inbox.
Script used to get benchmark results against the Linux source tree:
==> bench_unquote.perl <==
use strict;
use warnings;
use Benchmark ':hireswallclock';
my $nr = 50;
my %GIT_ESC = (
a => "\a",
b => "\b",
f => "\f",
n => "\n",
r => "\r",
t => "\t",
v => "\013",
);
sub git_unquote_ip ($) {
return $_[0] unless ($_[0] =~ /\A"(.*)"\z/);
$_[0] = $1;
$_[0] =~ s/\\([abfnrtv])/$GIT_ESC{$1}/g;
$_[0] =~ s/\\([0-7]{1,3})/chr(oct($1))/ge;
$_[0];
}
sub git_unquote_cp ($) {
my ($s) = @_;
return $s unless ($s =~ /\A"(.*)"\z/);
$s = $1;
$s =~ s/\\([abfnrtv])/$GIT_ESC{$1}/g;
$s =~ s/\\([0-7]{1,3})/chr(oct($1))/ge;
$s;
}
chomp(my @files = `git -C ~/linux ls-tree --name-only -r v4.19.13`);
timethese(10, {
cp => sub { for (0..$nr) { git_unquote_cp($_) for @files } },
ip => sub { for (0..$nr) { git_unquote_ip($_) for @files } },
});
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We'll be using it outside of searchidx...
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I've hit /proc/sys/fs/pipe-user-pages-* limits on some systems.
So stop hogging resources on pipes which don't benefit from
giant sizes.
Some of these can use eventfd in the future to further reduce
resource use.
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Since we'll be adding new repositories to the `alternates' file
in git, we must restart the `git cat-file --batch' process as
git currently does not detect changes to the alternates file
in long-running cat-file processes.
Don't bother with the `--batch-check' process since we won't be
using it with v2.
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Wrap the old Import package to enable creating new repos based
on size thresholds. This is better than relying on time-based
rotation as LKML traffic seems to be increasing.
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Using update-copyrights from gnulib
While we're at it, use the SPDX identifier for AGPL-3.0+ to
ease mechanical processing.
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We must ensure cat-file process is launched before Xapian
grabs lock, too. Our use of "git cat-file --batch" has
the same problem as "git log" did, (which was fixed in
commit 3713c727cda431a0dc2865a7878c13ecf9f21851)
"searchidx: release Xapian FDs before spawning git log"
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fork failures are unfortunately common when Xapian has
gigabytes and gigabytes mmapped.
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This hopefully makes the intent of the code clearer, too.
The the HTTP use of the numeric reference for getline
caused problems in Git.pm, already.
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This allows us to easily provide gigantic inboxes
with proper backpressure handling for slow clients.
It also eliminates public-inbox-httpd and Danga::Socket-specific
knowledge from this class, making it easier to follow for
those used to generic PSGI applications.
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This is probably trivial enough to be final?
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This lets us one-line git commands easily like ``, but without
having to remember --git-dir or escape arguments.
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We can rely on timely auto-destruction based on reference
counting; reducing the chance of redundant close(2) calls
which may hit the wront FD.
We do care about certain close calls (e.g. writing to a buffered
IO handle) if we require error-checking for write-integrity. In
other cases, let things go out-of-scope so it can be freed
automatically after use.
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This should reduce overhead of spawning git processes
from our long-running httpd and nntpd servers.
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We'll be using it for more than just cat-file.
Adding a `popen' API for internal use allows us to save a bunch
of code in other places.
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