Lots of tweaks to the install-chroot.sh and install-build-deps.sh

script to make them more userfriendly.

In particular, we now recognize systems that have multiple filesystems
(e.g. /home on NFS) and offer to do the right thing.

We also have better support for new Ubuntu distributions (both as
host and as guest). This means, we can now test on "precise".

Added a lot of extra error handling to catch common problems and either
fix them or offer suggestions on how the user can fix them. For example,
we now detect if the user tries to re-install the same chroot environment
multiple times; and we then offer to delete or overwrite the old
installation.

We also detect if a chroot environment is still in active use, and then
refuse to damage it.

In order to help users, who accidentally left an old chroot enviroment
running, we have added a "clean up" option to the wrapper script.

We automatically invoke install-build-deps.sh from install-chroot.sh,
so users only need to run install-chroot.sh and then answer a couple
of questions.

BUG=none
TEST=run install-chroot.sh on a Ubuntu machine and install both lucid32 and precise32. Verify that afterwards, we can build Chrome inside the chroot.
Review URL: https://chromiumcodereview.appspot.com/9702047

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@126957 0039d316-1c4b-4281-b951-d872f2087c98

build/install-build-deps.sh

@@ -30,9 +30,9 @@ do
 done
 
 if ! egrep -q \
-    'Ubuntu (10\.04|10\.10|11\.04|11\.10|lucid|maverick|natty|oneiric)' \
+    'Ubuntu (10\.04|10\.10|11\.04|11\.10|12\.04|lucid|maverick|natty|oneiric|precise)' \
     /etc/issue; then
-  echo "Only Ubuntu 10.04 (lucid) through 11.10 (oneiric) are currently" \
+  echo "Only Ubuntu 10.04 (lucid) through 12.04 (precise) are currently" \
       "supported" >&2
   exit 1
 fi
@@ -59,7 +59,7 @@ dev_list="apache2.2-bin bison curl elfutils fakeroot flex g++ gperf
           libglu1-mesa-dev libgnome-keyring-dev libgtk2.0-dev libjpeg62-dev
           libkrb5-dev libnspr4-dev libnss3-dev libpam0g-dev libsctp-dev
           libsqlite3-dev libssl-dev libudev-dev libwww-perl libxslt1-dev
-          libxss-dev libxt-dev libxtst-dev mesa-common-dev msttcorefonts patch
+          libxss-dev libxt-dev libxtst-dev mesa-common-dev patch
           perl php5-cgi pkg-config python python-cherrypy3 python-dev
           python-psutil rpm ruby subversion ttf-dejavu-core ttf-indic-fonts
           ttf-kochi-gothic ttf-kochi-mincho ttf-thai-tlwg wdiff git-core
@@ -90,13 +90,24 @@ dbg_list="libatk1.0-dbg libc6-dbg libcairo2-dbg libdbus-glib-1-2-dbg
 # Plugin lists needed for tests.
 plugin_list="flashplugin-installer"
 
-# Some NSS packages were renamed in Natty.
-if egrep -q 'Ubuntu (10\.04|10\.10)' /etc/issue; then
-  dbg_list="${dbg_list} libnspr4-0d-dbg libnss3-1d-dbg"
-  lib_list="${lib_list} libnspr4-0d libnss3-1d"
+# Some package names have changed over time
+if dpkg --print-avail msttcorefonts >/dev/null 2>&1; then
+  dev_list="${dev_list} msttcorefonts"
 else
+  dev_list="${dev_list} ttf-mscorefonts-installer"
+fi
+if dpkg --print-avail libnspr4 >/dev/null 2>&1; then
   dbg_list="${dbg_list} libnspr4-dbg libnss3-dbg"
   lib_list="${lib_list} libnspr4 libnss3"
+else
+  dbg_list="${dbg_list} libnspr4-0d-dbg libnss3-1d-dbg"
+  lib_list="${lib_list} libnspr4-0d libnss3-1d"
+fi
+
+# Some packages are only needed, if the distribution actually supports
+# installing them.
+if dpkg --print-avail appmenu-gtk >/dev/null 2>&1; then
+  lib_list="$lib_list appmenu-gtk"
 fi
 
 # Waits for the user to press 'Y' or 'N'. Either uppercase of lowercase is
@@ -161,7 +172,7 @@ sudo apt-get update
 # We then re-run "apt-get" with just the list of missing packages.
 echo "Finding missing packages..."
 packages="${dev_list} ${lib_list} ${dbg_list} ${plugin_list}"
-# Intentially leaving $packages unquoted so it's more readable.
+# Intentionally leaving $packages unquoted so it's more readable.
 echo "Packages required: " $packages
 echo
 new_list_cmd="sudo apt-get install --reinstall $(echo $packages)"
@@ -170,7 +181,7 @@ if new_list="$(yes n | LANG=C $new_list_cmd)"; then
   echo "No missing packages, and the packages are up-to-date."
 elif [ $? -eq 1 ]; then
   # We expect apt-get to have exit status of 1.
-  # This indicates that we canceled the install with "yes n|".
+  # This indicates that we cancelled the install with "yes n|".
   new_list=$(echo "$new_list" |
     sed -e '1,/The following NEW packages will be installed:/d;s/^  //;t;d')
   new_list=$(echo "$new_list" | sed 's/ *$//')