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_tar_gzip_archive(struct archiver_args *args)
 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("gzip","gzip",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 const struct snapshot_archive_t {
 48    	const char *suffix;
 49	const char *mimetype;
 50	write_archive_fn_t write_func;
 51}	snapshot_archives[] = {
 52	{ ".zip", "application/x-zip", write_zip_archive },
 53	{ ".tar.gz", "application/x-gzip", write_tar_gzip_archive }
 54};
 55
 56void cgit_print_snapshot(struct cacheitem *item, const char *hex, 
 57			 const char *prefix, const char *filename)
 58{
 59	int fnl = strlen(filename);
 60	int f;
 61    	for(f=0;f<(sizeof(snapshot_archives)/sizeof(*snapshot_archives));++f) {
 62		const struct snapshot_archive_t* sat = &snapshot_archives[f];
 63		int sl = strlen(sat->suffix);
 64		if(fnl<sl || strcmp(&filename[fnl-sl],sat->suffix))
 65			continue;
 66
 67		struct archiver_args args;
 68		struct commit *commit;
 69		unsigned char sha1[20];
 70
 71		if(get_sha1(hex, sha1)) {
 72			cgit_print_error(fmt("Bad object id: %s", hex));
 73			return;
 74		}
 75		commit = lookup_commit_reference(sha1);
 76
 77		if(!commit) {
 78			cgit_print_error(fmt("Not a commit reference: %s", hex));
 79			return;;
 80		}
 81
 82		memset(&args,0,sizeof(args));
 83		args.base = fmt("%s/", prefix);
 84		args.tree = commit->tree;
 85
 86		cgit_print_snapshot_start(sat->mimetype, filename, item);
 87		(*sat->write_func)(&args);
 88		return;
 89	}
 90	cgit_print_error(fmt("Unsupported snapshot format: %s", filename));
 91}
 92
 93void cgit_print_snapshot_links(const char *repo,const char *hex)
 94{
 95    	char *filename;
 96	int f;
 97    	for(f=0;f<(sizeof(snapshot_archives)/sizeof(*snapshot_archives));++f) {
 98		const struct snapshot_archive_t* sat = &snapshot_archives[f];
 99		filename = fmt("%s-%s%s",repo,hex,sat->suffix);
100		htmlf("<a href='%s'>%s</a><br/>",
101			cgit_pageurl(repo,"snapshot",
102			    fmt("id=%s&amp;name=%s",hex,filename)), filename);
103	}
104}