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 *hex, 
 69			 const char *prefix, const char *filename,
 70			 int snapshots)
 71{
 72	int fnl = strlen(filename);
 73	int f;
 74    	for(f=0;f<(sizeof(snapshot_archives)/sizeof(*snapshot_archives));++f) {
 75		const struct snapshot_archive_t* sat = &snapshot_archives[f];
 76		int sl;
 77		if(!(snapshots&sat->bit)) continue;
 78		sl = strlen(sat->suffix);
 79		if(fnl<sl || strcmp(&filename[fnl-sl],sat->suffix))
 80			continue;
 81
 82		struct archiver_args args;
 83		struct commit *commit;
 84		unsigned char sha1[20];
 85
 86		if(get_sha1(hex, sha1)) {
 87			cgit_print_error(fmt("Bad object id: %s", hex));
 88			return;
 89		}
 90		commit = lookup_commit_reference(sha1);
 91
 92		if(!commit) {
 93			cgit_print_error(fmt("Not a commit reference: %s", hex));
 94			return;;
 95		}
 96
 97		memset(&args,0,sizeof(args));
 98		args.base = fmt("%s/", prefix);
 99		args.tree = commit->tree;
100
101		cgit_print_snapshot_start(sat->mimetype, filename, item);
102		(*sat->write_func)(&args);
103		return;
104	}
105	cgit_print_error(fmt("Unsupported snapshot format: %s", filename));
106}
107
108void cgit_print_snapshot_links(const char *repo,const char *hex,int snapshots)
109{
110    	char *filename;
111	int f;
112    	for(f=0;f<(sizeof(snapshot_archives)/sizeof(*snapshot_archives));++f) {
113		const struct snapshot_archive_t* sat = &snapshot_archives[f];
114		if(!(snapshots&sat->bit)) continue;
115		filename = fmt("%s-%s%s",cgit_repobasename(repo),hex,sat->suffix);
116		htmlf("<a href='%s'>%s</a><br/>",
117			cgit_fileurl(repo,"snapshot",filename,
118			    fmt("id=%s&amp;name=%s",hex,filename)), filename);
119	}
120}
121
122int cgit_parse_snapshots_mask(const char *str)
123{
124	static const char *delim = " \t,:/|;";
125	int f, tl, rv = 0;
126	/* favor legacy setting */
127	if(atoi(str)) return 1;
128	for(;;) {
129		str += strspn(str,delim);
130		tl = strcspn(str,delim);
131		if(!tl)
132			break;
133		for(f=0;f<(sizeof(snapshot_archives)/sizeof(*snapshot_archives));++f) {
134			const struct snapshot_archive_t* sat = &snapshot_archives[f];
135			if(! ( strncmp(sat->suffix,str,tl) && strncmp(sat->suffix+1,str,tl-1) ) ) {
136				rv |= sat->bit;
137				break;
138			}
139		}
140		str += tl;
141	}
142	return rv;
143}
144
145/* vim:set sw=8: */