OS-8400 pkgsrc-setup should be able to re-bootstrap (#1053)

Reviewed by: Dan McDonald <danmcd@kebe.com>
Reviewed by: Travis <Tr@visPaul.me>
Approved by: Dan McDonald <danmcd@kebe.com>

man/manifest

@@ -4,6 +4,7 @@ d usr/share/man/man1 0755 root bin
 d usr/share/man/man3lib 0755 root bin
 d usr/share/man/man7 0755 root bin
 d usr/share/man/man8 0755 root bin
+f smartdc/man/man1/pkgsrc-setup.1 0444 root bin
 f smartdc/man/man1/sdc-factoryreset.1 0444 root bin
 f smartdc/man/man1/sdc-lastcomm.1 0444 root bin
 f smartdc/man/man1/sdc-zfs-io-throttle.1 0444 root bin

man/smartdc/man/man1/pkgsrc-setup.1.md

@@ -0,0 +1,25 @@
+# pkgsrc-setup(1) -- bootstrap pkgsrc-tools
+
+
+## SYNOPSIS
+
+`pkgsrc-setup [--clean]`
+
+
+## DESCRIPTION
+
+This command installs pkgsrc-tools for the global zone to /opt/tools.
+
+
+## OPTIONS
+
+`--clean`
+    This option will re-bootstrap the pkgsrc-tools installation by removing
+    /opt/tools and reinstalling all currently installed packages.
+    Re-bootstrapping is generally not necessary, but can be used to "reset"
+    the installation without having to manually reinstall all packages.
+
+
+## COPYRIGHT
+
+pkgsrc-setup Copyright 2022 MNX Cloud, Inc.

src/smartdc/bin/pkgsrc-setup.sh

@@ -18,6 +18,21 @@ if [[ -n "$TRACE" ]]; then
     set -o xtrace
 fi
 
+# If there's an existing install...
+if [[ -e /opt/tools/bin/pkgin ]]; then
+    # Re-bootstrap pkgsrc if requested.
+    if [[ $1 == '--clean' ]]; then
+        pkg_stash=$(mktemp)
+        pkgin export > "$pkg_stash"
+        rm -rf /opt/tools
+        shift
+    else
+        # Don't stomp an existing install.
+        printf 'pkgsrc has already been set up.\n'
+        exit
+    fi
+fi
+
 root="/${1}"
 
 # Occasionally, the filename and hash will need to be updated. Refer to
@@ -41,7 +56,12 @@ if [[ -d "$root" ]]; then
     tar -zxpf ${BOOTSTRAP_TAR} -C "${root}"
 fi
 
+if [[ -n $pkg_stash ]]; then
+    pkgin -y import "$pkg_stash"
+    rm "${pkg_stash:?}"
+fi
+
 if [[ ${#root} == 1 ]]; then
-    printf 'The pkgsrc-tools collection is now ready for use. It will be in\n'
+    printf '\nThe pkgsrc-tools collection is now ready for use. It will be in\n'
     printf 'your PATH the next time you log in.\n'
 fi