ui-snapshot.c


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.highlight .ge { font-s/* ui-snapshot.c: generate snapshot of a commit
 *
 * Copyright (C) 2006 Lars Hjemli
 *
 * Licensed under GNU General Public License v2
 *   (see COPYING for full license text)
 */

#include "cgit.h"

static int write_compressed_tar_archive(struct archiver_args *args,const char *filter)
{
	int rw[2];
	pid_t gzpid;
	int stdout2;
	int status;
	int rv;

	stdout2 = chk_non_negative(dup(STDIN_FILENO), "Preserving STDOUT before compressing");
	chk_zero(pipe(rw), "Opening pipe from compressor subprocess");
	gzpid = chk_non_negative(fork(), "Forking compressor subprocess");
	if(gzpid==0) {
		/* child */
		chk_zero(close(rw[1]), "Closing write end of pipe in child");
		chk_zero(close(STDIN_FILENO), "Closing STDIN");
		chk_non_negative(dup2(rw[0],STDIN_FILENO), "Redirecting compressor input to stdin");
		execlp(filter,filter,NULL);
		_exit(-1);
	}
	/* parent */
	chk_zero(close(rw[0]), "Closing read end of pipe");
	chk_non_negative(dup2(rw[1],STDOUT_FILENO), "Redirecting output to compressor");
	
	rv = write_tar_archive(args);

	chk_zero(close(STDOUT_FILENO), "Closing STDOUT redirected to compressor");
	chk_non_negative(dup2(stdout2,STDOUT_FILENO), "Restoring uncompressed STDOUT");
	chk_zero(close(stdout2), "Closing uncompressed STDOUT");
	chk_zero(close(rw[1]), "Closing write end of pipe in parent");
	chk_positive(waitpid(gzpid,&status,0), "Waiting on compressor process");
	if(! ( WIFEXITED(status) && WEXITSTATUS(status)==0 ) )
		cgit_print_error("Failed to compress archive");

	return rv;
}

static int write_tar_gzip_archive(struct archiver_args *args)
{
	return write_compressed_tar_archive(args,"gzip");
}
static int write_tar_bzip2_archive(struct archiver_args *args)
{
	return write_compressed_tar_archive(args,"bzip2");
}

static const struct snapshot_archive_t {
    	const char *suffix;
	const char *mimetype;
	write_archive_fn_t write_func;
}	snapshot_archives[] = {
	{ ".zip", "application/x-zip", write_zip_archive },
	{ ".tar.gz",