Date: Tue, 09 Aug 2011 22:06:07 -0500 From: Stephen Montgomery-Smith <stephen@missouri.edu> To: "ctm-users@freebsd.org" <ctm-users@freebsd.org> Subject: Use of xz instead of gzip Message-ID: <4E41F59F.9020201@missouri.edu>
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It seems that xz has much better compression than gzip. How do people
feel about moving CTM to use xz instead of gzip?
This will give about a 40% reduction in the size of the CTM files. In
particular, if I start putting SVN on CTM, this will save about 3G.
It requires two things:
First, the attached patch needs to be applied to /usr/src. (Any
committers willing to commit it? It needs to MFC'ed rather quickly if I
start using xz.)
Secondly, if your version of FreeBSD is old (like 7.x or older) you need
to install the archivers/xz port. If you don't, when you attempt to
apply ctm to a "xz" compressed file, it replies with a rather helpful
message "xz not found."
Stephen
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diff -ur ~/FreeBSD-8/src/usr.sbin/ctm/ctm/ctm.c usr.sbin/ctm/ctm/ctm.c
--- /home/stephen/FreeBSD-8/src/usr.sbin/ctm/ctm/ctm.c 2011-08-09 16:38:22.000000000 -0500
+++ usr.sbin/ctm/ctm/ctm.c 2011-08-09 21:11:31.000000000 -0500
@@ -211,6 +211,12 @@
strcat(p,filename);
f = popen(p,"r");
if(!f) { warn("%s", p); return Exit_Garbage; }
+ } else if(p && !strcmp(p,".xz")) {
+ p = alloca(20 + strlen(filename));
+ strcpy(p,"xz -dc < ");
+ strcat(p,filename);
+ f = popen(p,"r");
+ if(!f) { warn("%s", p); return Exit_Garbage; }
} else {
p = 0;
f = fopen(filename,"r");
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