[9fans] unlnfs

[9fans] unlnfs

[rog]

[-- Attachment #1: Type: text/plain, Size: 328 bytes --]

for those moving to fossil, here's a little program that
gets transforms the coded long names created by lnfs(1)
back into their original form.

run it on the same directory that was originally given to lnfs.

of course, someone's probably already done this,
but i couldn't find it on the system.

  cheers,
    rog.

[-- Attachment #2: unlnfs.c --]
[-- Type: text/plain, Size: 2062 bytes --]

#include <u.h>
#include <libc.h>
#include <bio.h>
#include <libsec.h>

enum
{
	ENCLEN = 26,
};

typedef struct Name Name;
struct Name {
	char		shortname[ENCLEN + 1];
	char*	longname;
	Name*	next;
};

Name *names;
void rename(char*, char*, char*);
void renamedir(char*);
void readnames(char*);

void
main(int argc, char **argv)
{
	char lnfile[256], *d;
	d = ".";
	if(argc > 1)
		d = argv[1];

	snprint(lnfile, sizeof(lnfile), "%s/.longnames", d);
	readnames(lnfile);
	renamedir(d);
}

void
renamedir(char *d)
{
	int n;
	Dir *dir;
	char *sub;
	int fd, i;
	uchar digest[MD5dlen];
	Name *na;

	fd = open(d, OREAD);
	if (fd == -1)
		return;
	while((n = dirread(fd, &dir)) > 0){
		for(i = 0; i < n; i++){
			if(dir[i].mode & DMDIR){
				sub = malloc(strlen(d) + 1 + strlen(dir[i].name) + 1);
				sprint(sub, "%s/%s", d, dir[i].name);
				renamedir(sub);
				free(sub);
			}
			if(strlen(dir[i].name) != ENCLEN)
				continue;
			for (na = names; na != nil; na = na->next){
				if (strcmp(na->shortname, dir[i].name) == 0){
					rename(d, dir[i].name, na->longname);
					break;
				}
			}
		}
		free(dir);
	}
	close(fd);
}

void
rename(char *d, char *old, char *new)
{
	char *p;
	Dir dir;
	p = malloc(strlen(d) + 1 + strlen(old) + 1);
	sprint(p, "%s/%s", d, old);
	nulldir(&dir);
	dir.name = new;
	if(dirwstat(p, &dir) == -1)
		fprint(2, "unlnfs: cannot rename %s to %s: %r\n", p, new);
	free(p);
}
	
void
long2short(char shortname[ENCLEN+1], char *longname)
{
	uchar digest[MD5dlen];
	md5((uchar*)longname, strlen(longname), digest, nil);
	enc32(shortname, ENCLEN+1, digest, MD5dlen);
}

void
readnames(char *lnfile)
{
	Biobuf *bio;
	char *f;
	int slot;
	Name *n;

	bio = Bopen(lnfile, OREAD);
	if(bio == nil){
		fprint(2, "unlnfs: cannot open %s: %r\n", lnfile);
		exits("error");
	}
	while((f = Brdstr(bio, '\n', 1)) != nil){
		n = malloc(sizeof(Name));
		n->longname = f;
		long2short(n->shortname, f);
		n->next = names;
		names = n;
	}
	Bterm(bio);
}