1 files changed, 222 insertions, 0 deletions

diff --git a/www/git.causal.agency/cgit/filter.c b/www/git.causal.agency/cgit/filter.c
new file mode 100644
index 00000000..2b6c838e
--- /dev/null
+++ b/www/git.causal.agency/cgit/filter.c
@@ -0,0 +1,222 @@
+/* filter.c: filter framework functions
+ *
+ * Copyright (C) 2006-2014 cgit Development Team <cgit@lists.zx2c4.com>
+ *
+ * Licensed under GNU General Public License v2
+ *   (see COPYING for full license text)
+ */
+
+#include "cgit.h"
+#include "html.h"
+
+static inline void reap_filter(struct cgit_filter *filter)
+{
+	if (filter && filter->cleanup)
+		filter->cleanup(filter);
+}
+
+void cgit_cleanup_filters(void)
+{
+	int i;
+	reap_filter(ctx.cfg.about_filter);
+	reap_filter(ctx.cfg.commit_filter);
+	reap_filter(ctx.cfg.source_filter);
+	reap_filter(ctx.cfg.email_filter);
+	reap_filter(ctx.cfg.owner_filter);
+	reap_filter(ctx.cfg.auth_filter);
+	for (i = 0; i < cgit_repolist.count; ++i) {
+		reap_filter(cgit_repolist.repos[i].about_filter);
+		reap_filter(cgit_repolist.repos[i].commit_filter);
+		reap_filter(cgit_repolist.repos[i].source_filter);
+		reap_filter(cgit_repolist.repos[i].email_filter);
+		reap_filter(cgit_repolist.repos[i].owner_filter);
+	}
+}
+
+static int open_exec_filter(struct cgit_filter *base, va_list ap)
+{
+	struct cgit_exec_filter *filter = (struct cgit_exec_filter *)base;
+	int pipe_fh[2];
+	int i;
+
+	for (i = 0; i < filter->base.argument_count; i++)
+		filter->argv[i + 1] = va_arg(ap, char *);
+
+	chk_zero(fflush(stdout), "unable to flush STDOUT");
+	filter->old_stdout = chk_positive(dup(STDOUT_FILENO),
+		"Unable to duplicate STDOUT");
+	chk_zero(pipe(pipe_fh), "Unable to create pipe to subprocess");
+	filter->pid = chk_non_negative(fork(), "Unable to create subprocess");
+	if (filter->pid == 0) {
+		close(pipe_fh[1]);
+		chk_non_negative(dup2(pipe_fh[0], STDIN_FILENO),
+			"Unable to use pipe as STDIN");
+		execvp(filter->cmd, filter->argv);
+		die_errno("Unable to exec subprocess %s", filter->cmd);
+	}
+	close(pipe_fh[0]);
+	chk_non_negative(dup2(pipe_fh[1], STDOUT_FILENO),
+		"Unable to use pipe as STDOUT");
+	close(pipe_fh[1]);
+	return 0;
+}
+
+static int close_exec_filter(struct cgit_filter *base)
+{
+	struct cgit_exec_filter *filter = (struct cgit_exec_filter *)base;
+	int i, exit_status = 0;
+
+	chk_zero(fflush(stdout), "unable to flush STDOUT");
+	chk_non_negative(dup2(filter->old_stdout, STDOUT_FILENO),
+		"Unable to restore STDOUT");
+	close(filter->old_stdout);
+	if (filter->pid < 0)
+		goto done;
+	waitpid(filter->pid, &exit_status, 0);
+	if (WIFEXITED(exit_status))
+		goto done;
+	die("Subprocess %s exited abnormally", filter->cmd);
+
+done:
+	for (i = 0; i < filter->base.argument_count; i++)
+		filter->argv[i + 1] = NULL;
+	return WEXITSTATUS(exit_status);
+
+}
+
+static void fprintf_exec_filter(struct cgit_filter *base, FILE *f, const char *prefix)
+{
+	struct cgit_exec_filter *filter = (struct cgit_exec_filter *)base;
+	fprintf(f, "%sexec:%s\n", prefix, filter->cmd);
+}
+
+static void cleanup_exec_filter(struct cgit_filter *base)
+{
+	struct cgit_exec_filter *filter = (struct cgit_exec_filter *)base;
+	if (filter->argv) {
+		free(filter->argv);
+		filter->argv = NULL;
+	}
+	if (filter->cmd) {
+		free(filter->cmd);
+		filter->cmd = NULL;
+	}
+}
+
+static struct cgit_filter *new_exec_filter(const char *cmd, int argument_count)
+{
+	struct cgit_exec_filter *f;
+	int args_size = 0;
+
+	f = xmalloc(sizeof(*f));
+	/* We leave argv for now and assign it below. */
+	cgit_exec_filter_init(f, xstrdup(cmd), NULL);
+	f->base.argument_count = argument_count;
+	args_size = (2 + argument_count) * sizeof(char *);
+	f->argv = xmalloc(args_size);
+	memset(f->argv, 0, args_size);
+	f->argv[0] = f->cmd;
+	return &f->base;
+}
+
+void cgit_exec_filter_init(struct cgit_exec_filter *filter, char *cmd, char **argv)
+{
+	memset(filter, 0, sizeof(*filter));
+	filter->base.open = open_exec_filter;
+	filter->base.close = close_exec_filter;
+	filter->base.fprintf = fprintf_exec_filter;
+	filter->base.cleanup = cleanup_exec_filter;
+	filter->cmd = cmd;
+	filter->argv = argv;
+	/* The argument count for open_filter is zero by default, unless called from new_filter, above. */
+	filter->base.argument_count = 0;
+}
+
+int cgit_open_filter(struct cgit_filter *filter, ...)
+{
+	int result;
+	va_list ap;
+	if (!filter)
+		return 0;
+	va_start(ap, filter);
+	result = filter->open(filter, ap);
+	va_end(ap);
+	return result;
+}
+
+int cgit_close_filter(struct cgit_filter *filter)
+{
+	if (!filter)
+		return 0;
+	return filter->close(filter);
+}
+
+void cgit_fprintf_filter(struct cgit_filter *filter, FILE *f, const char *prefix)
+{
+	filter->fprintf(filter, f, prefix);
+}
+
+
+
+static const struct {
+	const char *prefix;
+	struct cgit_filter *(*ctor)(const char *cmd, int argument_count);
+} filter_specs[] = {
+	{ "exec", new_exec_filter },
+};
+
+struct cgit_filter *cgit_new_filter(const char *cmd, filter_type filtertype)
+{
+	char *colon;
+	int i;
+	size_t len;
+	int argument_count;
+
+	if (!cmd || !cmd[0])
+		return NULL;
+
+	colon = strchr(cmd, ':');
+	len = colon - cmd;
+	/*
+	 * In case we're running on Windows, don't allow a single letter before
+	 * the colon.
+	 */
+	if (len == 1)
+		colon = NULL;
+
+	switch (filtertype) {
+		case AUTH:
+			argument_count = 12;
+			break;
+
+		case EMAIL:
+			argument_count = 2;
+			break;
+
+		case OWNER:
+			argument_count = 0;
+			break;
+
+		case SOURCE:
+		case ABOUT:
+			argument_count = 1;
+			break;
+
+		case COMMIT:
+		default:
+			argument_count = 0;
+			break;
+	}
+
+	/* If no prefix is given, exec filter is the default. */
+	if (!colon)
+		return new_exec_filter(cmd, argument_count);
+
+	for (i = 0; i < ARRAY_SIZE(filter_specs); i++) {
+		if (len == strlen(filter_specs[i].prefix) &&
+		    !strncmp(filter_specs[i].prefix, cmd, len))
+			return filter_specs[i].ctor(colon + 1, argument_count);
+	}
+
+	die("Invalid filter type: %.*s", (int) len, cmd);
+}