DragonFly upgrade script

[Tse]

Hiya dears,

I'm not sure if this the appropriate place, or if this is something you'd
like to consider; but I wanted to look at simplifying the OS upgrade
process. Turning this:
------
> cd /usr
> make src-create
> ...
> make buildworld
> make buildkernel
> ...
> make upgrade
------

Into this:
------
> /usr/upgrade
Upgrading DragonFly BSD

For more information see:
  `man build`      `man config`
  /usr/src/README  /usr/src/UPDATING
  http://www.dragonflybsd.org/docs/handbook/

It is possible to run this script without root privileges
Usage:  upgrade [configuration]
Configuration is "X86_64_GENERIC"

Latest releases:
  [1]  DragonFly_RELEASE_5_6
  [2]  DragonFly_RELEASE_5_4
  [3]  DragonFly_RELEASE_5_2
  [4]  DragonFly_RELEASE_5_0
  [5]  DragonFly_RELEASE_4_8

Select [1-5]:
------

I've tested it on new installs of 4.8, 5.2, and 5.4, and with installs
previously upgraded with `make src-create/src-create-shallow`

Anyway, here's the script:
------
#!/bin/sh

# ensure PATH contains what we use
export PATH=/sbin:/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin

echo 'Upgrading DragonFly BSD'
echo ''
echo 'For more information see:'
echo '  `man build`      `man config`'
echo '  /usr/src/README  /usr/src/UPDATING'
echo '  http://www.dragonflybsd.org/docs/handbook/'
echo ''

errmsg() { echo "Failed:  $1"; exit; }

# warn if root, or enable non-root usage
test `id -u` -eq 0 \
&& echo 'It is possible to run this script without root privileges' \
|| test `stat -f '%u' /usr/src` -eq 0  -o  `stat -f '%u' /usr/obj` -eq 0 \
&& su -m root -c "chown -R `id -u` /usr/src; chown -R `id -u` /usr/obj"
2>/dev/null

# get KERNCONF
KERNCONF="$1"
test "$KERNCONF" \
|| { echo 'Usage:  upgrade [configuration]'; KERNCONF='X86_64_GENERIC'; }
echo "Configuration is \"$KERNCONF\""
echo ''

# create the base repository
test -d /usr/src \
|| {
  su -m root -c "mkdir /usr/src && chown `id -u` /usr/src" \
  && cd /usr/src \
  && git init >/dev/null \
  && git remote add origin git://git.dragonflybsd.org/dragonfly.git; }
cd /usr/src

# test network connection
git ls-remote origin not-here >/dev/null 2>&1 \
|| errmsg 'Could not reach git://git.dragonflybsd.org'

# list possible releases to choose from
RELEASES=`git ls-remote -q | grep 'DragonFly_RELEASE' | tail -5 -r | sed -E
's/.*\/heads\///'`
echo 'Latest releases:'
echo "$RELEASES" | cat -n | sed -E 's/^ +([0-9]+)./  [\1]  /'
echo ''
printf 'Select [1-5]: '; read choice

# choice is acceptable number in range 1-5
test $choice -ge 1 -a $choice -le 5     2>/dev/null \
&& echo "$RELEASES" | head -"$choice"   2>/dev/null >&2 \
|| { echo 'Requires a number [1-5]'; exit; }
CHOICE=`echo "$RELEASES" | head -"$choice" | tail -1`

# install
git fetch --depth=1 origin "$CHOICE" \
|| errmsg 'git fetch' \
&& git checkout "$CHOICE" \
|| errmsg 'git checkout' \
&& test -f "/usr/src/sys/config/$KERNCONF" \
|| errmsg "Configuration \"$KERNCONF\" not in /usr/src/sys/config" \
&& make -j`sysctl -n hw.ncpu` buildworld \
|| errmsg 'make buildworld' \
&& make -j`sysctl -n hw.ncpu` buildkernel KERNCONF="$KERNCONF" \
|| errmsg 'make buildkernel' \
&& su -m root -c "make installkernel KERNCONF='$KERNCONF'" \
|| errmsg        'make installkernel' \
&& su -m root -c 'make installworld' \
|| errmsg        'make installworld' \
&& su -m root -c 'make upgrade' \
|| errmsg        'make upgrade'
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