hgfs(4) getrevinfo patch

[Alex Musolino <alex@musolino.id.au>]

Hi again,

Another problem with hgfs(4) is that it incorrectly reports the size
of files under the 'changes' directory that were renamed in a commit.

Here's my fix.  Seems to work, but also seems too obvious not to have
been done this way already.  Thoughts?

diff -r 754916eeedf1 sys/src/cmd/hgfs/fs.c
--- a/sys/src/cmd/hgfs/fs.c	Tue Dec 03 18:32:30 2019 +1030
+++ b/sys/src/cmd/hgfs/fs.c	Thu Dec 05 19:13:06 2019 +1030
@@ -104,7 +104,6 @@
 getrevinfo(int rev)
 {
 	Revinfo *ri;
-
 	if(rev < 0 || rev >= changelog.nmap)
 		return nil;
 	if(ri = changelog.map[rev].aux)
@@ -236,7 +235,7 @@
 	char buf[64], *s;
 	Revnode *nd;
 	Revinfo *ri;
-	int rev;
+	int rev, fd;
 
 	memset(d, 0, sizeof(*d));
 
@@ -302,15 +301,9 @@
 				break;
 			if((rev = hashrev(rl, nd->hash)) >= 0){
 				if(level == Qtree){
-					/*
-					 * BUG: this is not correct. mercurial might
-					 * prefix the data log with random \1\n escaped
-					 * metadata strings (see fmetaheader()) and the flen
-					 * *includes* the metadata part. we try to compensate
-					 * for this once the revision got extracted and
-					 * subtract the metadata header in fsstat().
-					 */
-					d->length = rl->map[rev].flen;
+					fd = revlogopentemp(rl, rev);
+					d->length = rl->map[rev].flen - fmetaheader(fd);
+					close(fd);
 				}
 				ri = getrevinfo(rl->map[rev].linkrev);
 			}