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#include "html.h"
 11
 12static int write_compressed_tar_archive(struct archiver_args *args,const char *filter)
 13{
 14	int rw[2];
 15	pid_t gzpid;
 16	int stdout2;
 17	int status;
 18	int rv;
 19
 20	stdout2 = chk_non_negative(dup(STDIN_FILENO), "Preserving STDOUT before compressing");
 21	chk_zero(pipe(rw), "Opening pipe from compressor subprocess");
 22	gzpid = chk_non_negative(fork(), "Forking compressor subprocess");
 23	if(gzpid==0) {
 24		/* child */
 25		chk_zero(close(rw[1]), "Closing write end of pipe in child");
 26		chk_zero(close(STDIN_FILENO), "Closing STDIN");
 27		chk_non_negative(dup2(rw[0],STDIN_FILENO), "Redirecting compressor input to stdin");
 28		execlp(filter,filter,NULL);
 29		_exit(-1);
 30	}
 31	/* parent */
 32	chk_zero(close(rw[0]), "Closing read end of pipe");
 33	chk_non_negative(dup2(rw[1],STDOUT_FILENO), "Redirecting output to compressor");
 34
 35	rv = write_tar_archive(args);
 36
 37	chk_zero(close(STDOUT_FILENO), "Closing STDOUT redirected to compressor");
 38	chk_non_negative(dup2(stdout2,STDOUT_FILENO), "Restoring uncompressed STDOUT");
 39	chk_zero(close(stdout2), "Closing uncompressed STDOUT");
 40	chk_zero(close(rw[1]), "Closing write end of pipe in parent");
 41	chk_positive(waitpid(gzpid,&status,0), "Waiting on compressor process");
 42	if(! ( WIFEXITED(status) && WEXITSTATUS(status)==0 ) )
 43		cgit_print_error("Failed to compress archive");
 44
 45	return rv;
 46}
 47
 48static int write_tar_gzip_archive(struct archiver_args *args)
 49{
 50	return write_compressed_tar_archive(args,"gzip");
 51}
 52
 53static int write_tar_bzip2_archive(struct archiver_args *args)
 54{
 55	return write_compressed_tar_archive(args,"bzip2");
 56}
 57
 58static const struct snapshot_archive_t {
 59    	const char *suffix;
 60	const char *mimetype;
 61	write_archive_fn_t write_func;
 62	int bit;
 63}	snapshot_archives[] = {
 64	{ ".zip", "application/x-zip", write_zip_archive, 0x1 },
 65	{ ".tar.gz", "application/x-tar", write_tar_gzip_archive, 0x2 },
 66	{ ".tar.bz2", "application/x-tar", write_tar_bzip2_archive, 0x4 },
 67	{ ".tar", "application/x-tar", write_tar_archive, 0x8 }
 68};
 69
 70#define snapshot_archives_len (sizeof(snapshot_archives) / sizeof(*snapshot_archives))
 71
 72void cgit_print_snapshot(struct cacheitem *item, const char *head,
 73			 const char *hex, const char *prefix,
 74			 const char *filename, int snapshots)
 75{
 76	const struct snapshot_archive_t* sat;
 77	struct archiver_args args;
 78	struct commit *commit;
 79	unsigned char sha1[20];
 80	int f, sl, fnl = strlen(filename);
 81
 82	for(f=0; f<snapshot_archives_len; f++) {
 83		sat = &snapshot_archives[f];
 84		if(!(snapshots & sat->bit))
 85			continue;
 86		sl = strlen(sat->suffix);
 87		if(fnl<sl || strcmp(&filename[fnl-sl],sat->suffix))
 88			continue;
 89		if (!hex)
 90			hex = head;
 91		if(get_sha1(hex, sha1)) {
 92			cgit_print_error(fmt("Bad object id: %s", hex));
 93			return;
 94		}
 95		commit = lookup_commit_reference(sha1);
 96		if(!commit) {
 97			cgit_print_error(fmt("Not a commit reference: %s", hex));
 98			return;;
 99		}
100		memset(&args,0,sizeof(args));
101		args.base = fmt("%s/", prefix);
102		args.tree = commit->tree;
103		args.time = commit->date;
104		ctx.page.mimetype = xstrdup(sat->mimetype);
105		ctx.page.filename = xstrdup(filename);
106		cgit_print_http_headers(&ctx);
107		(*sat->write_func)(&args);
108		return;
109	}
110	cgit_print_error(fmt("Unsupported snapshot format: %s", filename));
111}
112
113void cgit_print_snapshot_links(const char *repo, const char *head,
114			       const char *hex, int snapshots)
115{
116	const struct snapshot_archive_t* sat;
117    	char *filename;
118	int f;
119
120	for(f=0; f<snapshot_archives_len; f++) {
121		sat = &snapshot_archives[f];
122		if(!(snapshots & sat->bit))
123			continue;
124		filename = fmt("%s-%s%s", cgit_repobasename(repo), hex,
125			       sat->suffix);
126		cgit_snapshot_link(filename, NULL, NULL, (char *)head,
127				   (char *)hex, filename);
128		html("<br/>");
129	}
130}
131
132int cgit_parse_snapshots_mask(const char *str)
133{
134	const struct snapshot_archive_t* sat;
135	static const char *delim = " \t,:/|;";
136	int f, tl, sl, rv = 0;
137
138	/* favor legacy setting */
139	if(atoi(str))
140		return 1;
141	for(;;) {
142		str += strspn(str,delim);
143		tl = strcspn(str,delim);
144		if(!tl)
145			break;
146		for(f=0; f<snapshot_archives_len; f++) {
147			sat = &snapshot_archives[f];
148			sl = strlen(sat->suffix);
149			if((tl == sl && !strncmp(sat->suffix, str, tl)) ||
150			   (tl == sl-1 && !strncmp(sat->suffix+1, str, tl-1))) {
151				rv |= sat->bit;
152				break;
153			}
154		}
155		str += tl;
156	}
157	return rv;
158}
159
160/* vim:set sw=8: */