When running pkg_add -r, check & install our dependencies for each

package rather than expecting our top level package to get all of
the dependencies correct.

Previously, the code depended on the top level package having all
of the pkgdep lines in +CONTENTS correct and in the right order,
but that doesn't always happen due to code such as this (in
security/gnutls/Makefile):

    .if (defined(WITH_LZO) || exists(${LOCALBASE}/lib/liblzo2.so)) && !defined(WITHOUT_LZO)
    LIB_DEPENDS+=           lzo2:${PORTSDIR}/archivers/lzo2
    ....

With such conditional dependencies, my 'sophox-packages' package won't
install.  The dependency tree looks like this:

    sophox-packages
      ...
      x11/gnome2
        x11/gnome-applets
          net/libgweather
            devel/libsoup
              security/gnutls
                security/libgcrypt
                  security/libgpg-error
      ...
      x11/gnome2
        archivers/file-roller
          archivers/gtar
            archivers/lzop
              archivers/lzo2
      ...

gnutls doesn't depend on lzo2 initially, but lzo2 is dragged into the
mix via other dependencies and is built by the initial 'make'.  The
subsequent package generation for gnutls adds a pkgdep line for lzo2
to gnutls' +CONTENTS but the pkgdeps in sophox-packages' +CONTENTS
has gnutls *before* lzo2.

As a result, sophox-packages cannot install; gnutls fails because lzo2
is missing, 82 more packages fail because gnutls is missing and the
whole thing spirals into a super-confusing mess!

MFC after:	3 weeks

3 files changed, 29 insertions, 25 deletions

diff --git a/usr.sbin/pkg_install/lib/lib.h b/usr.sbin/pkg_install/lib/lib.h
index aef772b..acbd017 100644
--- a/usr.sbin/pkg_install/lib/lib.h
+++ b/usr.sbin/pkg_install/lib/lib.h
@@ -159,9 +159,9 @@ STAILQ_HEAD(reqr_by_head, reqr_by_entry);
 int		vsystem(const char *, ...);
 char		*vpipe(const char *, ...);
 void		cleanup(int);
-char		*make_playpen(char *, off_t);
+const char	*make_playpen(char *, off_t);
 char		*where_playpen(void);
-void		leave_playpen(void);
+int		leave_playpen(void);
 off_t		min_free(const char *);
 
 /* String */
@@ -183,7 +183,7 @@ Boolean		isfile(const char *);
 Boolean		isempty(const char *);
 Boolean		issymlink(const char *);
 Boolean		isURL(const char *);
-char		*fileGetURL(const char *, const char *, int);
+const char	*fileGetURL(const char *, const char *, int);
 char		*fileFindByPath(const char *, const char *);
 char		*fileGetContents(const char *);
 void		write_file(const char *, const char *);
diff --git a/usr.sbin/pkg_install/lib/pen.c b/usr.sbin/pkg_install/lib/pen.c
index fef3f9d..2f7e917 100644
--- a/usr.sbin/pkg_install/lib/pen.c
+++ b/usr.sbin/pkg_install/lib/pen.c
@@ -31,7 +31,6 @@ __FBSDID("$FreeBSD$");
 
 /* For keeping track of where we are */
 static char PenLocation[FILENAME_MAX];
-static char Previous[FILENAME_MAX];
 
 char *
 where_playpen(void)
@@ -76,12 +75,14 @@ find_play_pen(char *pen, off_t sz)
 static char *pstack[MAX_STACK];
 static int pdepth = -1;
 
-static void
+static const char *
 pushPen(const char *pen)
 {
     if (++pdepth == MAX_STACK)
 	errx(2, "%s: stack overflow.\n", __func__);
     pstack[pdepth] = strdup(pen);
+
+    return pstack[pdepth];
 }
 
 static void
@@ -99,10 +100,11 @@ popPen(char *pen)
  * Make a temporary directory to play in and chdir() to it, returning
  * pathname of previous working directory.
  */
-char *
+const char *
 make_playpen(char *pen, off_t sz)
 {
     char humbuf1[6], humbuf2[6];
+    char cwd[FILENAME_MAX];
 
     if (!find_play_pen(pen, sz))
 	return NULL;
@@ -134,7 +136,7 @@ make_playpen(char *pen, off_t sz)
 	     "with more space and\ntry the command again", __func__, pen);
     }
 
-    if (!getcwd(Previous, FILENAME_MAX)) {
+    if (!getcwd(cwd, FILENAME_MAX)) {
 	upchuck("getcwd");
 	return NULL;
     }
@@ -144,34 +146,35 @@ make_playpen(char *pen, off_t sz)
 	errx(2, "%s: can't chdir to '%s'", __func__, pen);
     }
 
-    if (PenLocation[0])
-	pushPen(PenLocation);
-
     strcpy(PenLocation, pen);
-    return Previous;
+    return pushPen(cwd);
 }
 
 /* Convenience routine for getting out of playpen */
-void
+int
 leave_playpen()
 {
+    static char left[FILENAME_MAX];
     void (*oldsig)(int);
 
+    if (!PenLocation[0])
+	return 0;
+
     /* Don't interrupt while we're cleaning up */
     oldsig = signal(SIGINT, SIG_IGN);
-    if (Previous[0]) {
-	if (chdir(Previous) == FAIL) {
-	    cleanup(0);
-	    errx(2, "%s: can't chdir back to '%s'", __func__, Previous);
-	}
-	Previous[0] = '\0';
-    }
-    if (PenLocation[0]) {
-	if (PenLocation[0] == '/' && vsystem("/bin/rm -rf %s", PenLocation))
-	    warnx("couldn't remove temporary dir '%s'", PenLocation);
-	popPen(PenLocation);
+    strcpy(left, PenLocation);
+    popPen(PenLocation);
+
+    if (chdir(PenLocation) == FAIL) {
+	cleanup(0);
+	errx(2, "%s: can't chdir back to '%s'", __func__, PenLocation);
     }
+
+    if (left[0] == '/' && vsystem("/bin/rm -rf %s", left))
+	warnx("couldn't remove temporary dir '%s'", left);
     signal(SIGINT, oldsig);
+
+    return 1;
 }
 
 off_t
diff --git a/usr.sbin/pkg_install/lib/url.c b/usr.sbin/pkg_install/lib/url.c
index 1cf5d31..8121283 100644
--- a/usr.sbin/pkg_install/lib/url.c
+++ b/usr.sbin/pkg_install/lib/url.c
@@ -32,10 +32,11 @@ __FBSDID("$FreeBSD$");
  * Try and fetch a file by URL, returning the directory name for where
  * it's unpacked, if successful.
  */
-char *
+const char *
 fileGetURL(const char *base, const char *spec, int keep_package)
 {
-    char *cp, *rp, *tmp;
+    const char *rp;
+    char *cp, *tmp;
     char fname[FILENAME_MAX];
     char pen[FILENAME_MAX];
     char pkg[FILENAME_MAX];