[RFC/PATCH v4 2/2] gitweb: append short hash ids to snapshot files

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Teach gitweb how to produce nicer snapshot names by only using the
short hash id. If clients make requests using a tree-ish that is not a
partial or full SHA-1 hash, then the short hash will also be appended
to whatever they asked for.

This also includes tests cases for t9502-gitweb-standalone-parse-output.

Signed-off-by: Mark Rada <marada@xxxxxxxxxxxx>
---
 gitweb/gitweb.perl                        |   26 +++++++++++
 t/t9502-gitweb-standalone-parse-output.sh |   67 +++++++++++++++++++++++++++++
 2 files changed, 93 insertions(+), 0 deletions(-)
 create mode 100644 t/t9502-gitweb-standalone-parse-output.sh

diff --git a/gitweb/gitweb.perl b/gitweb/gitweb.perl
index e1beca5..fdecc3d 100755
--- a/gitweb/gitweb.perl
+++ b/gitweb/gitweb.perl
@@ -2006,6 +2006,26 @@ sub git_get_full_hash {
 	return $retval;
 }
 
+# try and get a shorter hash id
+sub git_get_short_hash {
+	my $project = shift;
+	my $hash = shift;
+	my $o_git_dir = $git_dir;
+	my $retval = undef;
+	$git_dir = "$projectroot/$project";
+	if (open my $fd, '-|', git_cmd(), 'rev-parse', '--short', $hash) {
+		$hash = <$fd>;
+		close $fd;
+		if (defined $hash && $hash =~ /^([0-9a-fA-F]{7,})$/) {
+			$retval = $1;
+		}
+	}
+	if (defined $o_git_dir) {
+		$git_dir = $o_git_dir;
+	}
+	return $retval;
+}
+
 # get type of given object
 sub git_get_type {
 	my $hash = shift;
@@ -5207,6 +5227,12 @@ sub git_snapshot {
 		die_error(404, 'Hash id was not valid');
 	}
 
+
+	if ($full_hash !~ /$hash/) {
+		$hash .= '-' . git_get_short_hash($project, $hash);
+	} else {
+		$hash = git_get_short_hash($project, $hash);
+	}
 	my $name = $project;
 	$name =~ s,([^/])/*\.git$,$1,;
 	$name = basename($name);
diff --git a/t/t9502-gitweb-standalone-parse-output.sh b/t/t9502-gitweb-standalone-parse-output.sh
new file mode 100644
index 0000000..1a2a27f
--- /dev/null
+++ b/t/t9502-gitweb-standalone-parse-output.sh
@@ -0,0 +1,67 @@
+#!/bin/sh
+#
+# Copyright (c) 2009 Mark Rada
+#
+
+test_description='gitweb as standalone script (parsing script output).
+
+This test runs gitweb (git web interface) as a CGI script from the
+commandline, and checks that it produces the correct output, either
+in the HTTP header or the actual script output.'
+
+
+. ./gitweb-lib.sh
+
+# ----------------------------------------------------------------------
+# snapshot file name
+
+test_commit \
+	'SnapshotFileTests' \
+	'i can has snapshot?'
+
+test_expect_success \
+	'snapshots: give full hash' \
+	'ID=`git rev-parse --verify HEAD` &&
+	gitweb_run "p=.git;a=snapshot;h=$ID;sf=tgz" &&
+	ID=`git rev-parse --short HEAD` &&
+	grep ".git-$ID.tar.gz" gitweb.output'
+test_debug 'cat gitweb.output'
+
+test_expect_success \
+	'snapshots: give short hash' \
+	'ID=`git rev-parse --short HEAD` &&
+	gitweb_run "p=.git;a=snapshot;h=$ID;sf=tgz" &&
+	grep ".git-$ID.tar.gz" gitweb.output'
+test_debug 'cat gitweb.output'
+
+test_expect_success \
+	'snapshots: give almost full hash' \
+	'ID=`git rev-parse --short=30 HEAD` &&
+	gitweb_run "p=.git;a=snapshot;h=$ID;sf=tgz" &&
+	ID=`git rev-parse --short HEAD` &&
+	grep ".git-$ID.tar.gz" gitweb.output'
+test_debug 'cat gitweb.output'
+
+test_expect_success \
+	'snapshots: give HEAD tree-ish' \
+	'gitweb_run "p=.git;a=snapshot;h=HEAD;sf=tgz" &&
+	ID=`git rev-parse --short HEAD` &&
+	grep ".git-HEAD-$ID.tar.gz" gitweb.output'
+test_debug 'cat gitweb.output'
+
+test_expect_success \
+	'snapshots: give branch name tree-ish' \
+	'gitweb_run "p=.git;a=snapshot;h=master;sf=tgz" &&
+	ID=`git rev-parse --short master` &&
+	grep ".git-master-$ID.tar.gz" gitweb.output'
+test_debug 'cat gitweb.output'
+
+test_expect_success \
+	'snapshots: give tag tree-ish' \
+	'gitweb_run "p=.git;a=snapshot;h=SnapshotFileTests;sf=tgz" &&
+	ID=`git rev-parse --short SnapshotFileTests` &&
+	grep ".git-SnapshotFileTests-$ID.tar.gz" gitweb.output'
+test_debug 'cat gitweb.output'
+
+
+test_done
-- 
1.6.4.2
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