From 773a5f451d951042f1a9541533ee9b5c97430c39 Mon Sep 17 00:00:00 2001
From: jkh <jkh@FreeBSD.org>
Date: Tue, 6 Dec 1994 00:51:50 +0000
Subject: Many of John T. Kohl's patches from NetBSD.  Thanks, John! Submitted
 by:	jkohl

---
 usr.sbin/pkg_install/create/pl.c | 133 +++++++++++++++++++++++++++++++++++++--
 1 file changed, 127 insertions(+), 6 deletions(-)

(limited to 'usr.sbin/pkg_install/create/pl.c')

diff --git a/usr.sbin/pkg_install/create/pl.c b/usr.sbin/pkg_install/create/pl.c
index 0d87779..f50bd8f 100644
--- a/usr.sbin/pkg_install/create/pl.c
+++ b/usr.sbin/pkg_install/create/pl.c
@@ -1,5 +1,5 @@
 #ifndef lint
-static const char *rcsid = "$Id: pl.c,v 1.4 1994/08/29 16:31:38 adam Exp $";
+static const char *rcsid = "$Id: pl.c,v 1.5 1994/11/17 10:35:04 jkh Exp $";
 #endif
 
 /*
@@ -24,6 +24,7 @@ static const char *rcsid = "$Id: pl.c,v 1.4 1994/08/29 16:31:38 adam Exp $";
 
 #include "lib.h"
 #include "create.h"
+#include <errno.h>
 
 /* Check a list for files that require preconversion */
 void
@@ -59,6 +60,35 @@ check_list(char *home, Package *pkg)
     }
 }   
 
+static int
+trylink(const char *from, const char *to)
+{
+    if (link(from, to) == 0)
+	return 0;
+    if (errno == ENOENT) {
+	/* try making the container directory */
+	char *cp = strrchr(to, '/');
+	if (cp)
+	    vsystem("mkdir -p %.*s", cp - to,
+		    to);
+	return link(from, to);
+    }
+    return -1;
+}
+
+#define STARTSTRING "tar cf -"
+#define TOOBIG(str) strlen(str) + 6 + strlen(home) + where_count > maxargs
+#define PUSHOUT() /* push out string */ \
+	if (where_count > sizeof(STARTSTRING)-1) { \
+		    strcat(where_args, "|tar xpf -"); \
+		    if (system(where_args)) \
+			barf("can't invoke tar pipeline"); \
+		    memset(where_args, 0, maxargs); \
+ 		    last_chdir = NULL; \
+		    strcpy(where_args, STARTSTRING); \
+		    where_count = sizeof(STARTSTRING)-1; \
+	}
+
 /*
  * Copy unmarked files in packing list to playpen - marked files
  * have already been copied in an earlier pass through the list.
@@ -68,7 +98,30 @@ copy_plist(char *home, Package *plist)
 {
     PackingList p = plist->head;
     char *where = home;
-    char *there = NULL;
+    char *there = NULL, *mythere;
+    char *where_args, *last_chdir, *root = "/";
+    int maxargs, where_count = 0, add_count;
+    struct stat stb;
+    dev_t curdir;
+
+    maxargs = sysconf(_SC_ARG_MAX);
+    maxargs -= 64;			/* some slop for the tar cmd text,
+					   and sh -c */
+    where_args = malloc(maxargs);
+    if (!where_args)
+	barf("can't get argument list space");
+
+    memset(where_args, 0, maxargs);
+    strcpy(where_args, STARTSTRING);
+    where_count = sizeof(STARTSTRING)-1;
+    last_chdir = 0;
+
+    if (stat(".", &stb) == 0)
+	curdir = stb.st_dev;
+    else
+	curdir = (dev_t) -1;		/* It's ok if this is a valid dev_t;
+					   this is just a hint for an
+					   optimization. */
 
     while (p) {
 	if (p->type == PLIST_CWD)
@@ -80,16 +133,84 @@ copy_plist(char *home, Package *plist)
 	else if (p->type == PLIST_FILE && !p->marked) {
 	    char fn[FILENAME_MAX];
 
+
 	    /* First, look for it in the "home" dir */
 	    sprintf(fn, "%s/%s", home, p->name);
-	    if (fexists(fn))
-		copy_hierarchy(home, p->name, FALSE);
+	    if (fexists(fn)) {
+		if (lstat(fn, &stb) == 0 && stb.st_dev == curdir &&
+		    S_ISREG(stb.st_mode)) {
+		    /* if we can link it to the playpen, that avoids a copy
+		       and saves time. */
+		    if (p->name[0] != '/') {
+			/* don't link abspn stuff--it doesn't come from
+			   local dir! */
+			if (trylink(fn, p->name) == 0) {
+			    p = p->next;
+			    continue;
+			}
+		    }
+		}
+		if (TOOBIG(fn)) {
+		    PUSHOUT();
+		}
+		if (p->name[0] == '/') {
+		    add_count = snprintf(&where_args[where_count],
+					 maxargs - where_count,
+					 " %s %s",
+					 last_chdir == root ? "" : "-C /",
+					 p->name);
+		    last_chdir = root;
+		} else {
+		    add_count = snprintf(&where_args[where_count],
+					 maxargs - where_count,
+					 " %s%s %s", 
+					 last_chdir == home ? "" : "-C ",
+					 last_chdir == home ? "" : home,
+					 p->name);
+		    last_chdir = home;
+		}
+		if (add_count > maxargs - where_count)
+		    barf("oops, miscounted strings!");
+		where_count += add_count;
+	    }
 	    /*
 	     * Otherwise, try along the actual extraction path..
 	     */
-	    else
-		copy_hierarchy(there ? there : where, p->name, FALSE);
+	    else {
+		if (p->name[0] == '/')
+		    mythere = root;
+		else mythere = there;
+		sprintf(fn, "%s/%s", mythere ? mythere : where, p->name);
+		if (lstat(fn, &stb) == 0 && stb.st_dev == curdir &&
+		    S_ISREG(stb.st_mode)) {
+		    /* if we can link it to the playpen, that avoids a copy
+		       and saves time. */
+		    if (trylink(fn, p->name) == 0) {
+			p = p->next;
+			continue;
+		    }
+		}
+		if (TOOBIG(p->name)) {
+		    PUSHOUT();
+		}
+		if (last_chdir == (mythere ? mythere : where))
+		    add_count = snprintf(&where_args[where_count],
+					 maxargs - where_count,
+					 " %s", p->name);
+		else
+		    add_count = snprintf(&where_args[where_count],
+					 maxargs - where_count,
+					 " -C %s %s",
+					 mythere ? mythere : where,
+					 p->name);
+		if (add_count > maxargs - where_count)
+		    barf("oops, miscounted strings!");
+		where_count += add_count;
+		last_chdir = (mythere ? mythere : where);
+	    }
 	}
 	p = p->next;
     }
+    PUSHOUT();
+    free(where_args);
 }
-- 
cgit v1.1