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cvsserver: generalize getmeta() to recognize commit refs 

This allows getmeta() to recognize any commitish (sha1,
tag/branch name, etc).

Signed-off-by: Matthew Ogilvie <mmogilvi_git@miniinfo.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Matthew Ogilvie 2012-10-13 23:42:29 -06:00 committed by Junio C Hamano
parent eb5dcb2c02
commit bfdafa099e
1 changed files with 148 additions and 14 deletions
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162
git-cvsserver.perl
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@ -4041,6 +4041,19 @@ =head2 getmeta
This function takes a filename (with path) argument and returns a hashref of
metadata for that file.
There are several ways $revision can be specified:
- A reference to hash that contains a "tag" that is the
actual revision (one of the below). TODO: Also allow it to
specify a "date" in the hash.
- undef, to refer to the latest version on the main branch.
- Full CVS client revision number (mapped to integer in DB, without the
"1." prefix),
- Complex CVS-compatible "special" revision number for
non-linear history (see comment below)
- git commit sha1 hash
- branch or tag name
=cut
sub getmeta
@ -4051,23 +4064,144 @@ sub getmeta
my $tablename_rev = $self->tablename("revision");
my $tablename_head = $self->tablename("head");
my $db_query;
if ( defined($revision) and $revision =~ /^1\.(\d+)$/ )
if ( ref($revision) eq "HASH" )
{
my ($intRev) = $1;
$db_query = $self->{dbh}->prepare_cached("SELECT * FROM $tablename_rev WHERE name=? AND revision=?",{},1);
$db_query->execute($filename, $intRev);
}
elsif ( defined($revision) and $revision =~ /^[a-zA-Z0-9]{40}$/ )
{
$db_query = $self->{dbh}->prepare_cached("SELECT * FROM $tablename_rev WHERE name=? AND commithash=?",{},1);
$db_query->execute($filename, $revision);
} else {
$db_query = $self->{dbh}->prepare_cached("SELECT * FROM $tablename_head WHERE name=?",{},1);
$db_query->execute($filename);
$revision = $revision->{tag};
}
# Overview of CVS revision numbers:
#
# General CVS numbering scheme:
# - Basic mainline branch numbers: "1.1", "1.2", "1.3", etc.
# - Result of "cvs checkin -r" (possible, but not really
# recommended): "2.1", "2.2", etc
# - Branch tag: "1.2.0.n", where "1.2" is revision it was branched
# from, "0" is a magic placeholder that identifies it as a
# branch tag instead of a version tag, and n is 2 times the
# branch number off of "1.2", starting with "2".
# - Version on a branch: "1.2.n.x", where "1.2" is branch-from, "n"
# is branch number off of "1.2" (like n above), and "x" is
# the version number on the branch.
# - Branches can branch off of branches: "1.3.2.7.4.1" (even number
# of components).
# - Odd "n"s are used by "vendor branches" that result
# from "cvs import". Vendor branches have additional
# strangeness in the sense that the main rcs "head" of the main
# branch will (temporarily until first normal commit) point
# to the version on the vendor branch, rather than the actual
# main branch. (FUTURE: This may provide an opportunity
# to use "strange" revision numbers for fast-forward-merged
# branch tip when CVS client is asking for the main branch.)
#
# git-cvsserver CVS-compatible special numbering schemes:
# - Currently git-cvsserver only tries to be identical to CVS for
# simple "1.x" numbers on the "main" branch (as identified
# by the module name that was originally cvs checkout'ed).
# - The database only stores the "x" part, for historical reasons.
# But most of the rest of the cvsserver preserves
# and thinks using the full revision number.
# - To handle non-linear history, it uses a version of the form
# "2.1.1.2000.b.b.b."..., where the 2.1.1.2000 is to help uniquely
# identify this as a special revision number, and there are
# 20 b's that together encode the sha1 git commit from which
# this version of this file originated. Each b is
# the numerical value of the corresponding byte plus
# 100.
# - "plus 100" avoids "0"s, and also reduces the
# likelyhood of a collision in the case that someone someday
# writes an import tool that tries to preserve original
# CVS revision numbers, and the original CVS data had done
# lots of branches off of branches and other strangeness to
# end up with a real version number that just happens to look
# like this special revision number form. Also, if needed
# there are several ways to extend/identify alternative encodings
# within the "2.1.1.2000" part if necessary.
# - Unlike real CVS revisions, you can't really reconstruct what
# relation a revision of this form has to other revisions.
# - FUTURE: TODO: Rework database somehow to make up and remember
# fully-CVS-compatible branches and branch version numbers.
my $meta;
if ( defined($revision) )
{
if ( $revision =~ /^1\.(\d+)$/ )
{
my ($intRev) = $1;
my $db_query;
$db_query = $self->{dbh}->prepare_cached(
"SELECT * FROM $tablename_rev WHERE name=? AND revision=?",
{},1);
$db_query->execute($filename, $intRev);
$meta = $db_query->fetchrow_hashref;
}
elsif ( $revision =~ /^2\.1\.1\.2000(\.[1-3][0-9][0-9]){20}$/ )
{
my ($commitHash)=($revision=~/^2\.1\.1\.2000(.*)$/);
$commitHash=~s/\.([0-9]+)/sprintf("%02x",$1-100)/eg;
if($commitHash=~/^[0-9a-f]{40}$/)
{
return $self->getMetaFromCommithash($filename,$commitHash);
}
# error recovery: fall back on head version below
print "E Failed to find $filename version=$revision or commit=$commitHash\n";
$log->warning("failed get $revision with commithash=$commitHash");
undef $revision;
}
elsif ( $revision =~ /^[0-9a-f]{40}$/ )
{
# Try DB first. This is mostly only useful for req_annotate(),
# which only calls this for stuff that should already be in
# the DB. It is fairly likely to be a waste of time
# in most other cases [unless the file happened to be
# modified in $revision specifically], but
# it is probably in the noise compared to how long
# getMetaFromCommithash() will take.
my $db_query;
$db_query = $self->{dbh}->prepare_cached(
"SELECT * FROM $tablename_rev WHERE name=? AND commithash=?",
{},1);
$db_query->execute($filename, $revision);
$meta = $db_query->fetchrow_hashref;
if(! $meta)
{
my($revCommit)=$self->lookupCommitRef($revision);
if($revCommit=~/^[0-9a-f]{40}$/)
{
return $self->getMetaFromCommithash($filename,$revCommit);
}
# error recovery: nothing found:
print "E Failed to find $filename version=$revision\n";
$log->warning("failed get $revision");
return $meta;
}
}
else
{
my($revCommit)=$self->lookupCommitRef($revision);
if($revCommit=~/^[0-9a-f]{40}$/)
{
return $self->getMetaFromCommithash($filename,$revCommit);
}
# error recovery: fall back on head version below
print "E Failed to find $filename version=$revision\n";
$log->warning("failed get $revision");
undef $revision; # Allow fallback
}
}
if(!defined($revision))
{
my $db_query;
$db_query = $self->{dbh}->prepare_cached(
"SELECT * FROM $tablename_head WHERE name=?",{},1);
$db_query->execute($filename);
$meta = $db_query->fetchrow_hashref;
}
my $meta = $db_query->fetchrow_hashref;
if($meta)
{
$meta->{revision} = "1.$meta->{revision}";