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	int bit;
 61}	snapshot_archives[] = {
 62	{ ".zip", "application/x-zip", write_zip_archive, 0x1 },
 63	{ ".tar.gz", "application/x-tar", write_tar_gzip_archive, 0x2 },
 64	{ ".tar.bz2", "application/x-tar", write_tar_bzip2_archive, 0x4 },
 65	{ ".tar", "application/x-tar", write_tar_archive, 0x8 }
 66};
 67
 68void cgit_print_snapshot(struct cacheitem *item, const char *head,
 69			 const char *hex, const char *prefix,
 70			 const char *filename, int snapshots)
 71{
 72	int fnl = strlen(filename);
 73	int f, n;
 74
 75	n = sizeof(snapshot_archives) / sizeof(*snapshot_archives);
 76    	for(f=0; f<n; f++) {
 77		const struct snapshot_archive_t* sat = &snapshot_archives[f];
 78		int sl;
 79		if(!(snapshots & sat->bit))
 80			continue;
 81		sl = strlen(sat->suffix);
 82		if(fnl<sl || strcmp(&filename[fnl-sl],sat->suffix))
 83			continue;
 84
 85		struct archiver_args args;
 86		struct commit *commit;
 87		unsigned char sha1[20];
 88
 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
 97		if(!commit) {
 98			cgit_print_error(fmt("Not a commit reference: %s", hex));
 99			return;;
100		}
101
102		memset(&args,0,sizeof(args));
103		args.base = fmt("%s/", prefix);
104		args.tree = commit->tree;
105
106		cgit_print_snapshot_start(sat->mimetype, filename, item);
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    	char *filename;
117	int f, n;
118
119	n = sizeof(snapshot_archives) / sizeof(*snapshot_archives);
120    	for(f=0; f<n ;f++) {
121		const struct snapshot_archive_t* 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	static const char *delim = " \t,:/|;";
135	int f, tl, rv = 0;
136	/* favor legacy setting */
137	if(atoi(str)) return 1;
138	for(;;) {
139		str += strspn(str,delim);
140		tl = strcspn(str,delim);
141		if(!tl)
142			break;
143		for(f=0;f<(sizeof(snapshot_archives)/sizeof(*snapshot_archives));++f) {
144			const struct snapshot_archive_t* sat = &snapshot_archives[f];
145			if(! ( strncmp(sat->suffix,str,tl) && strncmp(sat->suffix+1,str,tl-1) ) ) {
146				rv |= sat->bit;
147				break;
148			}
149		}
150		str += tl;
151	}
152	return rv;
153}
154
155/* vim:set sw=8: */