1/* ui-snapshot.c: generate snapshot of a commit
  2 *
  3 * Copyright (C) 2006 Lars Hjemli
  4 *
  5 * Licensed under GNU General Public License v2
  6 *   (see COPYING for full license text)
  7 */
  8
  9#include "cgit.h"
 10
 11static int write_compressed_tar_archive(struct archiver_args *args,const char *filter)
 12{
 13	int rw[2];
 14	pid_t gzpid;
 15	int stdout2;
 16	int status;
 17	int rv;
 18
 19	stdout2 = chk_non_negative(dup(STDIN_FILENO), "Preserving STDOUT before compressing");
 20	chk_zero(pipe(rw), "Opening pipe from compressor subprocess");
 21	gzpid = chk_non_negative(fork(), "Forking compressor subprocess");
 22	if(gzpid==0) {
 23		/* child */
 24		chk_zero(close(rw[1]), "Closing write end of pipe in child");
 25		chk_zero(close(STDIN_FILENO), "Closing STDIN");
 26		chk_non_negative(dup2(rw[0],STDIN_FILENO), "Redirecting compressor input to stdin");
 27		execlp(filter,filter,NULL);
 28		_exit(-1);
 29	}
 30	/* parent */
 31	chk_zero(close(rw[0]), "Closing read end of pipe");
 32	chk_non_negative(dup2(rw[1],STDOUT_FILENO), "Redirecting output to compressor");
 33	
 34	rv = write_tar_archive(args);
 35
 36	chk_zero(close(STDOUT_FILENO), "Closing STDOUT redirected to compressor");
 37	chk_non_negative(dup2(stdout2,STDOUT_FILENO), "Restoring uncompressed STDOUT");
 38	chk_zero(close(stdout2), "Closing uncompressed STDOUT");
 39	chk_zero(close(rw[1]), "Closing write end of pipe in parent");
 40	chk_positive(waitpid(gzpid,&status,0), "Waiting on compressor process");
 41	if(! ( WIFEXITED(status) && WEXITSTATUS(status)==0 ) )
 42		cgit_print_error("Failed to compress archive");
 43
 44	return rv;
 45}
 46
 47static int write_tar_gzip_archive(struct archiver_args *args)
 48{
 49	return write_compressed_tar_archive(args,"gzip");
 50}
 51static int write_tar_bzip2_archive(struct archiver_args *args)
 52{
 53	return write_compressed_tar_archive(args,"bzip2");
 54}
 55
 56static const struct snapshot_archive_t {
 57    	const char *suffix;
 58	const char *mimetype;
 59	write_archive_fn_t write_func;
 60}	snapshot_archives[] = {
 61	{ ".zip", "application/x-zip", write_zip_archive },
 62	{ ".tar.gz", "application/x-tar", write_tar_gzip_archive },
 63	{ ".tar.bz2", "application/x-tar", write_tar_bzip2_archive }
 64};
 65
 66void cgit_print_snapshot(struct cacheitem *item, const char *hex, 
 67			 const char *prefix, const char *filename)
 68{
 69	int fnl = strlen(filename);
 70	int f;
 71    	for(f=0;f<(sizeof(snapshot_archives)/sizeof(*snapshot_archives));++f) {
 72		const struct snapshot_archive_t* sat = &snapshot_archives[f];
 73		int sl = strlen(sat->suffix);
 74		if(fnl<sl || strcmp(&filename[fnl-sl],sat->suffix))
 75			continue;
 76
 77		struct archiver_args args;
 78		struct commit *commit;
 79		unsigned char sha1[20];
 80
 81		if(get_sha1(hex, sha1)) {
 82			cgit_print_error(fmt("Bad object id: %s", hex));
 83			return;
 84		}
 85		commit = lookup_commit_reference(sha1);
 86
 87		if(!commit) {
 88			cgit_print_error(fmt("Not a commit reference: %s", hex));
 89			return;;
 90		}
 91
 92		memset(&args,0,sizeof(args));
 93		args.base = fmt("%s/", prefix);
 94		args.tree = commit->tree;
 95
 96		cgit_print_snapshot_start(sat->mimetype, filename, item);
 97		(*sat->write_func)(&args);
 98		return;
 99	}
100	cgit_print_error(fmt("Unsupported snapshot format: %s", filename));
101}
102
103void cgit_print_snapshot_links(const char *repo,const char *hex)
104{
105    	char *filename;
106	int f;
107    	for(f=0;f<(sizeof(snapshot_archives)/sizeof(*snapshot_archives));++f) {
108		const struct snapshot_archive_t* sat = &snapshot_archives[f];
109		filename = fmt("%s-%s%s",repo,hex,sat->suffix);
110		htmlf("<a href='%s'>%s</a><br/>",
111			cgit_pageurl(repo,"snapshot",
112			    fmt("id=%s&amp;name=%s",hex,filename)), filename);
113	}
114}
115/* vim:set sw=8: */