4 files changed, 530 insertions, 0 deletions
diff --git a/contrib/coccinelle/xstrdup_or_null.cocci b/contrib/coccinelle/xstrdup_or_null.cocci
new file mode 100644
index 0000000000..3fceef132b
--- /dev/null
+++ b/contrib/coccinelle/xstrdup_or_null.cocci
@@ -0,0 +1,7 @@
+@@
+expression E;
+expression V;
+@@
+- if (E)
+-    V = xstrdup(E);
++ V = xstrdup_or_null(E);
diff --git a/contrib/credential/libsecret/Makefile b/contrib/credential/libsecret/Makefile
new file mode 100644
index 0000000000..3e67552cc5
--- /dev/null
+++ b/contrib/credential/libsecret/Makefile
@@ -0,0 +1,25 @@
+MAIN:=git-credential-libsecret
+all:: $(MAIN)
+
+CC = gcc
+RM = rm -f
+CFLAGS = -g -O2 -Wall
+PKG_CONFIG = pkg-config
+
+-include ../../../config.mak.autogen
+-include ../../../config.mak
+
+INCS:=$(shell $(PKG_CONFIG) --cflags libsecret-1 glib-2.0)
+LIBS:=$(shell $(PKG_CONFIG) --libs libsecret-1 glib-2.0)
+
+SRCS:=$(MAIN).c
+OBJS:=$(SRCS:.c=.o)
+
+%.o: %.c
+	$(CC) $(CFLAGS) $(CPPFLAGS) $(INCS) -o $@ -c $<
+
+$(MAIN): $(OBJS)
+	$(CC) -o $@ $(LDFLAGS) $^ $(LIBS)
+
+clean:
+	@$(RM) $(MAIN) $(OBJS)
diff --git a/contrib/credential/libsecret/git-credential-libsecret.c b/contrib/credential/libsecret/git-credential-libsecret.c
new file mode 100644
index 0000000000..4c56979d8a
--- /dev/null
+++ b/contrib/credential/libsecret/git-credential-libsecret.c
@@ -0,0 +1,370 @@
+/*
+ * Copyright (C) 2011 John Szakmeister <john@szakmeister.net>
+ *               2012 Philipp A. Hartmann <pah@qo.cx>
+ *               2016 Mantas Mikulėnas <grawity@gmail.com>
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, write to the Free Software
+ *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+/*
+ * Credits:
+ * - GNOME Keyring API handling originally written by John Szakmeister
+ * - ported to credential helper API by Philipp A. Hartmann
+ */
+
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <glib.h>
+#include <libsecret/secret.h>
+
+/*
+ * This credential struct and API is simplified from git's credential.{h,c}
+ */
+struct credential {
+	char *protocol;
+	char *host;
+	unsigned short port;
+	char *path;
+	char *username;
+	char *password;
+};
+
+#define CREDENTIAL_INIT { NULL, NULL, 0, NULL, NULL, NULL }
+
+typedef int (*credential_op_cb)(struct credential *);
+
+struct credential_operation {
+	char *name;
+	credential_op_cb op;
+};
+
+#define CREDENTIAL_OP_END { NULL, NULL }
+
+/* ----------------- Secret Service functions ----------------- */
+
+static char *make_label(struct credential *c)
+{
+	if (c->port)
+		return g_strdup_printf("Git: %s://%s:%hu/%s",
+					c->protocol, c->host, c->port, c->path ? c->path : "");
+	else
+		return g_strdup_printf("Git: %s://%s/%s",
+					c->protocol, c->host, c->path ? c->path : "");
+}
+
+static GHashTable *make_attr_list(struct credential *c)
+{
+	GHashTable *al = g_hash_table_new_full(g_str_hash, g_str_equal, NULL, g_free);
+
+	if (c->username)
+		g_hash_table_insert(al, "user", g_strdup(c->username));
+	if (c->protocol)
+		g_hash_table_insert(al, "protocol", g_strdup(c->protocol));
+	if (c->host)
+		g_hash_table_insert(al, "server", g_strdup(c->host));
+	if (c->port)
+		g_hash_table_insert(al, "port", g_strdup_printf("%hu", c->port));
+	if (c->path)
+		g_hash_table_insert(al, "object", g_strdup(c->path));
+
+	return al;
+}
+
+static int keyring_get(struct credential *c)
+{
+	SecretService *service = NULL;
+	GHashTable *attributes = NULL;
+	GError *error = NULL;
+	GList *items = NULL;
+
+	if (!c->protocol || !(c->host || c->path))
+		return EXIT_FAILURE;
+
+	service = secret_service_get_sync(0, NULL, &error);
+	if (error != NULL) {
+		g_critical("could not connect to Secret Service: %s", error->message);
+		g_error_free(error);
+		return EXIT_FAILURE;
+	}
+
+	attributes = make_attr_list(c);
+	items = secret_service_search_sync(service,
+					   SECRET_SCHEMA_COMPAT_NETWORK,
+					   attributes,
+					   SECRET_SEARCH_LOAD_SECRETS,
+					   NULL,
+					   &error);
+	g_hash_table_unref(attributes);
+	if (error != NULL) {
+		g_critical("lookup failed: %s", error->message);
+		g_error_free(error);
+		return EXIT_FAILURE;
+	}
+
+	if (items != NULL) {
+		SecretItem *item;
+		SecretValue *secret;
+		const char *s;
+
+		item = items->data;
+		secret = secret_item_get_secret(item);
+		attributes = secret_item_get_attributes(item);
+
+		s = g_hash_table_lookup(attributes, "user");
+		if (s) {
+			g_free(c->username);
+			c->username = g_strdup(s);
+		}
+
+		s = secret_value_get_text(secret);
+		if (s) {
+			g_free(c->password);
+			c->password = g_strdup(s);
+		}
+
+		g_hash_table_unref(attributes);
+		secret_value_unref(secret);
+		g_list_free_full(items, g_object_unref);
+	}
+
+	return EXIT_SUCCESS;
+}
+
+
+static int keyring_store(struct credential *c)
+{
+	char *label = NULL;
+	GHashTable *attributes = NULL;
+	GError *error = NULL;
+
+	/*
+	 * Sanity check that what we are storing is actually sensible.
+	 * In particular, we can't make a URL without a protocol field.
+	 * Without either a host or pathname (depending on the scheme),
+	 * we have no primary key. And without a username and password,
+	 * we are not actually storing a credential.
+	 */
+	if (!c->protocol || !(c->host || c->path) ||
+	    !c->username || !c->password)
+		return EXIT_FAILURE;
+
+	label = make_label(c);
+	attributes = make_attr_list(c);
+	secret_password_storev_sync(SECRET_SCHEMA_COMPAT_NETWORK,
+				    attributes,
+				    NULL,
+				    label,
+				    c->password,
+				    NULL,
+				    &error);
+	g_free(label);
+	g_hash_table_unref(attributes);
+
+	if (error != NULL) {
+		g_critical("store failed: %s", error->message);
+		g_error_free(error);
+		return EXIT_FAILURE;
+	}
+
+	return EXIT_SUCCESS;
+}
+
+static int keyring_erase(struct credential *c)
+{
+	GHashTable *attributes = NULL;
+	GError *error = NULL;
+
+	/*
+	 * Sanity check that we actually have something to match
+	 * against. The input we get is a restrictive pattern,
+	 * so technically a blank credential means "erase everything".
+	 * But it is too easy to accidentally send this, since it is equivalent
+	 * to empty input. So explicitly disallow it, and require that the
+	 * pattern have some actual content to match.
+	 */
+	if (!c->protocol && !c->host && !c->path && !c->username)
+		return EXIT_FAILURE;
+
+	attributes = make_attr_list(c);
+	secret_password_clearv_sync(SECRET_SCHEMA_COMPAT_NETWORK,
+				    attributes,
+				    NULL,
+				    &error);
+	g_hash_table_unref(attributes);
+
+	if (error != NULL) {
+		g_critical("erase failed: %s", error->message);
+		g_error_free(error);
+		return EXIT_FAILURE;
+	}
+
+	return EXIT_SUCCESS;
+}
+
+/*
+ * Table with helper operation callbacks, used by generic
+ * credential helper main function.
+ */
+static struct credential_operation const credential_helper_ops[] = {
+	{ "get",   keyring_get },
+	{ "store", keyring_store },
+	{ "erase", keyring_erase },
+	CREDENTIAL_OP_END
+};
+
+/* ------------------ credential functions ------------------ */
+
+static void credential_init(struct credential *c)
+{
+	memset(c, 0, sizeof(*c));
+}
+
+static void credential_clear(struct credential *c)
+{
+	g_free(c->protocol);
+	g_free(c->host);
+	g_free(c->path);
+	g_free(c->username);
+	g_free(c->password);
+
+	credential_init(c);
+}
+
+static int credential_read(struct credential *c)
+{
+	char *buf;
+	size_t line_len;
+	char *key;
+	char *value;
+
+	key = buf = g_malloc(1024);
+
+	while (fgets(buf, 1024, stdin)) {
+		line_len = strlen(buf);
+
+		if (line_len && buf[line_len-1] == '\n')
+			buf[--line_len] = '\0';
+
+		if (!line_len)
+			break;
+
+		value = strchr(buf, '=');
+		if (!value) {
+			g_warning("invalid credential line: %s", key);
+			g_free(buf);
+			return -1;
+		}
+		*value++ = '\0';
+
+		if (!strcmp(key, "protocol")) {
+			g_free(c->protocol);
+			c->protocol = g_strdup(value);
+		} else if (!strcmp(key, "host")) {
+			g_free(c->host);
+			c->host = g_strdup(value);
+			value = strrchr(c->host, ':');
+			if (value) {
+				*value++ = '\0';
+				c->port = atoi(value);
+			}
+		} else if (!strcmp(key, "path")) {
+			g_free(c->path);
+			c->path = g_strdup(value);
+		} else if (!strcmp(key, "username")) {
+			g_free(c->username);
+			c->username = g_strdup(value);
+		} else if (!strcmp(key, "password")) {
+			g_free(c->password);
+			c->password = g_strdup(value);
+			while (*value)
+				*value++ = '\0';
+		}
+		/*
+		 * Ignore other lines; we don't know what they mean, but
+		 * this future-proofs us when later versions of git do
+		 * learn new lines, and the helpers are updated to match.
+		 */
+	}
+
+	g_free(buf);
+
+	return 0;
+}
+
+static void credential_write_item(FILE *fp, const char *key, const char *value)
+{
+	if (!value)
+		return;
+	fprintf(fp, "%s=%s\n", key, value);
+}
+
+static void credential_write(const struct credential *c)
+{
+	/* only write username/password, if set */
+	credential_write_item(stdout, "username", c->username);
+	credential_write_item(stdout, "password", c->password);
+}
+
+static void usage(const char *name)
+{
+	struct credential_operation const *try_op = credential_helper_ops;
+	const char *basename = strrchr(name, '/');
+
+	basename = (basename) ? basename + 1 : name;
+	fprintf(stderr, "usage: %s <", basename);
+	while (try_op->name) {
+		fprintf(stderr, "%s", (try_op++)->name);
+		if (try_op->name)
+			fprintf(stderr, "%s", "|");
+	}
+	fprintf(stderr, "%s", ">\n");
+}
+
+int main(int argc, char *argv[])
+{
+	int ret = EXIT_SUCCESS;
+
+	struct credential_operation const *try_op = credential_helper_ops;
+	struct credential cred = CREDENTIAL_INIT;
+
+	if (!argv[1]) {
+		usage(argv[0]);
+		exit(EXIT_FAILURE);
+	}
+
+	g_set_application_name("Git Credential Helper");
+
+	/* lookup operation callback */
+	while (try_op->name && strcmp(argv[1], try_op->name))
+		try_op++;
+
+	/* unsupported operation given -- ignore silently */
+	if (!try_op->name || !try_op->op)
+		goto out;
+
+	ret = credential_read(&cred);
+	if (ret)
+		goto out;
+
+	/* perform credential operation */
+	ret = (*try_op->op)(&cred);
+
+	credential_write(&cred);
+
+out:
+	credential_clear(&cred);
+	return ret;
+}
diff --git a/contrib/long-running-filter/example.pl b/contrib/long-running-filter/example.pl
new file mode 100755
index 0000000000..39457055a5
--- /dev/null
+++ b/contrib/long-running-filter/example.pl
@@ -0,0 +1,128 @@
+#!/usr/bin/perl
+#
+# Example implementation for the Git filter protocol version 2
+# See Documentation/gitattributes.txt, section "Filter Protocol"
+#
+# Please note, this pass-thru filter is a minimal skeleton. No proper
+# error handling was implemented.
+#
+
+use strict;
+use warnings;
+
+my $MAX_PACKET_CONTENT_SIZE = 65516;
+
+sub packet_bin_read {
+	my $buffer;
+	my $bytes_read = read STDIN, $buffer, 4;
+	if ( $bytes_read == 0 ) {
+
+		# EOF - Git stopped talking to us!
+		exit();
+	}
+	elsif ( $bytes_read != 4 ) {
+		die "invalid packet: '$buffer'";
+	}
+	my $pkt_size = hex($buffer);
+	if ( $pkt_size == 0 ) {
+		return ( 1, "" );
+	}
+	elsif ( $pkt_size > 4 ) {
+		my $content_size = $pkt_size - 4;
+		$bytes_read = read STDIN, $buffer, $content_size;
+		if ( $bytes_read != $content_size ) {
+			die "invalid packet ($content_size bytes expected; $bytes_read bytes read)";
+		}
+		return ( 0, $buffer );
+	}
+	else {
+		die "invalid packet size: $pkt_size";
+	}
+}
+
+sub packet_txt_read {
+	my ( $res, $buf ) = packet_bin_read();
+	unless ( $buf =~ s/\n$// ) {
+		die "A non-binary line MUST be terminated by an LF.";
+	}
+	return ( $res, $buf );
+}
+
+sub packet_bin_write {
+	my $buf = shift;
+	print STDOUT sprintf( "%04x", length($buf) + 4 );
+	print STDOUT $buf;
+	STDOUT->flush();
+}
+
+sub packet_txt_write {
+	packet_bin_write( $_[0] . "\n" );
+}
+
+sub packet_flush {
+	print STDOUT sprintf( "%04x", 0 );
+	STDOUT->flush();
+}
+
+( packet_txt_read() eq ( 0, "git-filter-client" ) ) || die "bad initialize";
+( packet_txt_read() eq ( 0, "version=2" ) )         || die "bad version";
+( packet_bin_read() eq ( 1, "" ) )                  || die "bad version end";
+
+packet_txt_write("git-filter-server");
+packet_txt_write("version=2");
+packet_flush();
+
+( packet_txt_read() eq ( 0, "capability=clean" ) )  || die "bad capability";
+( packet_txt_read() eq ( 0, "capability=smudge" ) ) || die "bad capability";
+( packet_bin_read() eq ( 1, "" ) )                  || die "bad capability end";
+
+packet_txt_write("capability=clean");
+packet_txt_write("capability=smudge");
+packet_flush();
+
+while (1) {
+	my ($command)  = packet_txt_read() =~ /^command=([^=]+)$/;
+	my ($pathname) = packet_txt_read() =~ /^pathname=([^=]+)$/;
+
+	packet_bin_read();
+
+	my $input = "";
+	{
+		binmode(STDIN);
+		my $buffer;
+		my $done = 0;
+		while ( !$done ) {
+			( $done, $buffer ) = packet_bin_read();
+			$input .= $buffer;
+		}
+	}
+
+	my $output;
+	if ( $command eq "clean" ) {
+		### Perform clean here ###
+		$output = $input;
+	}
+	elsif ( $command eq "smudge" ) {
+		### Perform smudge here ###
+		$output = $input;
+	}
+	else {
+		die "bad command '$command'";
+	}
+
+	packet_txt_write("status=success");
+	packet_flush();
+	while ( length($output) > 0 ) {
+		my $packet = substr( $output, 0, $MAX_PACKET_CONTENT_SIZE );
+		packet_bin_write($packet);
+		if ( length($output) > $MAX_PACKET_CONTENT_SIZE ) {
+			$output = substr( $output, $MAX_PACKET_CONTENT_SIZE );
+		}
+		else {
+			$output = "";
+		}
+	}
+	packet_flush();    # flush content!
+	packet_flush();    # empty list, keep "status=success" unchanged!
+
+}