Introduce notion of the package tools revision and allow to wrap all tools

included into pkg_install according to the content of /var/db/pkg_install.conf
file, which specifies version and alternative location of the tools. Format
of the said file is very simple: one line which specifies revision of the
alternative version of the tools and their location separated by space,
i.e.:

20030102 /usr/local/sbin

This would allow bsd.port.mk to install and use up to date version of tools
on older system from ports.

Also add new `-P' flag to pkg_info, which causes it to report currently
installed version of package tools.

Discussed with:	will

2 files changed, 99 insertions, 0 deletions

diff --git a/usr.sbin/pkg_install/lib/lib.h b/usr.sbin/pkg_install/lib/lib.h
index 6a01fac..00b735e 100644
--- a/usr.sbin/pkg_install/lib/lib.h
+++ b/usr.sbin/pkg_install/lib/lib.h
@@ -82,6 +82,15 @@
 /* The name of the "prefix" environment variable given to scripts */
 #define PKG_PREFIX_VNAME	"PKG_PREFIX"
 
+/*
+ * Version of the package tools - increase only when some
+ * functionality used by bsd.port.mk is changed, added or removed
+ */
+#define PKG_INSTALL_VERSION	20020908
+
+#define PKG_WRAPCONF_FNAME	"/var/db/pkg_install.conf"
+#define main(argc, argv)	real_main(argc, argv)
+
 /* Version numbers to assist with changes in package file format */
 #define PLIST_FMT_VER_MAJOR	1
 #define PLIST_FMT_VER_MINOR	1
@@ -190,6 +199,7 @@ Boolean 	make_preserve_name(char *, int, const char *, const char *);
 
 /* For all */
 int		pkg_perform(char **);
+int		real_main(int, char **);
 
 /* Query installed packages */
 char		**matchinstalled(match_t, char **, int *);
diff --git a/usr.sbin/pkg_install/lib/pkgwrap.c b/usr.sbin/pkg_install/lib/pkgwrap.c
new file mode 100644
index 0000000..cbd15cd
--- /dev/null
+++ b/usr.sbin/pkg_install/lib/pkgwrap.c
@@ -0,0 +1,89 @@
+/*
+ * FreeBSD install - a package for the installation and maintenance
+ * of non-core utilities.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * Maxim Sobolev
+ * 8 September 2002
+ *
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include "lib.h"
+#include <ctype.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+#undef main
+
+#define SEPARATORS " \t"
+
+extern char **environ;
+
+int
+main(int argc, char **argv)
+{
+    FILE *f;
+    char buffer[FILENAME_MAX], *cp, *verstr;
+    int len;
+
+    if (getenv("PKG_NOWRAP") != NULL)
+	goto nowrap;
+    f = fopen(PKG_WRAPCONF_FNAME, "r");
+    if (f == NULL)
+	goto nowrap;
+    cp = fgets(buffer, 256, f);
+    fclose(f);
+    if (cp == NULL)
+	goto nowrap;
+    len = strlen(cp);
+    if (cp[len - 1] == '\n')
+	cp[len - 1] = '\0';
+    while (strchr(SEPARATORS, *cp) != NULL)
+	cp++;
+    verstr = cp;
+    cp = strpbrk(cp, SEPARATORS);
+    if (cp == NULL)
+	goto nowrap;
+    *cp = '\0';
+    for (cp = verstr; *cp != '\0'; cp++)
+	if (isdigit(*cp) == 0)
+	    goto nowrap;
+    if (atoi(verstr) < PKG_INSTALL_VERSION)
+	goto nowrap;
+    cp++;
+    while (*cp != '\0' && strchr(SEPARATORS, *cp) != NULL)
+	cp++;
+    if (*cp == '\0')
+	goto nowrap;
+    bcopy(cp, buffer, strlen(cp) + 1);
+    cp = strpbrk(buffer, SEPARATORS);
+    if (cp != NULL)
+	*cp = '\0';
+    if (!isdir(buffer))
+	goto nowrap;
+    cp = strrchr(argv[0], '/');
+    if (cp == NULL)
+	cp = argv[0];
+    else
+	cp++;
+    strlcat(buffer, "/", sizeof(buffer));
+    strlcat(buffer, cp, sizeof(buffer));
+    setenv("PKG_NOWRAP", "1", 1);
+    execve(buffer, argv, environ);
+
+nowrap:
+    unsetenv("PKG_NOWRAP");
+    return(real_main(argc, argv));
+}