xbps{,-static}: add patch from master to reduce memory footprint.

This reduces the memory footprint while checking SHA256 hashes on files.
See 72c64c7626

srcpkgs/xbps-static/template

@@ -3,7 +3,7 @@
 # NOTE: keep this package synchronized with "srcpkgs/xbps".
 pkgname=xbps-static
 version=0.39
-revision=3
+revision=4
 bootstrap=yes
 short_desc="The XBPS package system utilities - static binaries"
 maintainer="Juan RP <xtraeme@gmail.com>"

srcpkgs/xbps/patches/0003-xbps_file_hash-reduce-memory-footprint-and-process-f.patch

@@ -0,0 +1,77 @@
+From 72c64c76262fef08cc09b25b3ec3ed80ad6136e7 Mon Sep 17 00:00:00 2001
+From: Juan RP <xtraeme@gmail.com>
+Date: Wed, 17 Sep 2014 06:50:46 +0200
+Subject: [PATCH] xbps_file_hash: reduce memory footprint and process file in
+ small chunks.
+
+With xbps-rindex(8) -c/-r being multithreaded, the memory usage was
+insanely high in the build server, with peaks of almost 4GB (this depends
+on the file size being processed and number of threads).
+
+Process the file in small chunks instead to compute the SHA256 hash.
+---
+ NEWS            |  4 ++++
+ lib/util_hash.c | 33 +++++++++++++++------------------
+ 2 files changed, 19 insertions(+), 18 deletions(-)
+
+diff --git a/lib/util_hash.c b/lib/util_hash.c
+index 4663ea1..990e31a 100644
+--- lib/util_hash.c
++++ lib/util_hash.c
+@@ -61,17 +61,16 @@ char *
+ xbps_file_hash(const char *file)
+ {
+ 	struct stat st;
++	SHA256_CTX ctx;
+ 	char hash[SHA256_DIGEST_LENGTH * 2 + 1];
+-	unsigned char *buf = NULL, digest[SHA256_DIGEST_LENGTH];
++	unsigned char digest[SHA256_DIGEST_LENGTH];
++	ssize_t ret;
++	unsigned char buf[256];
+ 	int fd;
+ 
+-	assert(file != NULL);
+-
+-	if ((fd = open(file, O_RDONLY|O_CLOEXEC)) == -1) {
+-		free(buf);
++	if ((fd = open(file, O_RDONLY)) == -1)
+ 		return NULL;
+-	}
+-	memset(&st, 0, sizeof(st));
++
+ 	if (fstat(fd, &st) == -1) {
+ 		(void)close(fd);
+ 		return NULL;
+@@ -81,20 +80,18 @@ xbps_file_hash(const char *file)
+ 		return NULL;
+ 	}
+ 
+-	buf = malloc(st.st_size);
+-	assert(buf);
++	SHA256_Init(&ctx);
++	while ((ret = read(fd, buf, sizeof(buf))) > 0)
++		SHA256_Update(&ctx, buf, ret);
+ 
+-	if (read(fd, buf, st.st_size) != st.st_size) {
+-	       free(buf);
+-	       (void)close(fd);
+-	       return NULL;
+-	}
+-	(void)close(fd);
+-	if (SHA256(buf, st.st_size, digest) == NULL) {
+-		free(buf);
++	if (ret == -1) {
++		/* read error */
++		(void)close(fd);
+ 		return NULL;
+ 	}
+-	free(buf);
++
++	SHA256_Final(digest, &ctx);
++	(void)close(fd);
+ 	digest2string(digest, hash, SHA256_DIGEST_LENGTH);
+ 
+ 	return strdup(hash);
+-- 
+2.1.0
+

srcpkgs/xbps/template

@@ -1,7 +1,7 @@
 # Template file for 'xbps'
 pkgname=xbps
 version=0.39
-revision=3
+revision=4
 bootstrap=yes
 short_desc="The XBPS package system utilities"
 maintainer="Juan RP <xtraeme@gmail.com>"