The postinstall Script
The postinstall script creates the backout package using the information provided by the other scripts. Since the pkgmk and pkgtrans commands do not require the package database, they can be executed within a package installation.
In the example, undoing the patch is permitted by constructing a stream format package in the save directory (using the PKGSAV environment variable). It is not obvious, but this package must be in stream format, because the save directory gets moved around during a pkgadd operation. If the pkgadd command is applied to a package in its own save directory, assumptions about where the package source is at any given time become very unreliable. A stream format package is unpacked into a temporary directory and installed from there. (A directory format package would begin installing from the save directory and find itself suddenly relocated during a pkgadd fail-safe operation.)
To determine which patches are applied to a package, use this command:
$ pkgparam SUNWstuf PATCHLIST |
With the exception of PATCHLIST, which is a Sun public interface, there is nothing significant in the parameter names in this example. Instead of PATCH you could use the traditional SUNW_PATCHID and the various other lists such as PATCH_EXCL and PATCH_REQD could be renamed accordingly.
If certain patch packages depend upon other patch packages which are available from the same medium, the checkinstall script could determine this and create a script to be executed by the postinstall script in the same way that the upgrade example (see "Upgrading Packages") does.
# This script creates the backout package for a patch package
#
# directory format options.
#
# @(#) postinstall 1.6 96/01/29 SMI
#
# Copyright (c) 1995 by Sun Microsystems, Inc.
# All rights reserved
#
# Description:
# Set the TYPE parameter for the remote file
#
# Parameters:
# none
#
# Globals set:
# TYPE
set_TYPE_parameter () {
if [ ${PATCH_UNDO_ARCHIVE:?????} = "/dev" ]; then
# handle device specific stuff
TYPE="removable"
else
TYPE="filesystem"
fi
}
#
# Description:
# Build the remote file that points to the backout data
#
# Parameters:
# $1: the un/compressed undo archive
#
# Globals set:
# UNDO, STATE
build_remote_file () {
remote_path=$PKGSAV/$Patch_label/remote
set_TYPE_parameter
STATE="active"
if [ $1 = "undo" ]; then
UNDO="undo"
else
UNDO="undo.Z"
fi
cat > $remote_path << EOF
# Backout data stored remotely
TYPE=$TYPE
FIND_AT=$ARCHIVE_DIR/$UNDO
STATE=$STATE
EOF
}
PATH=/usr/sadm/bin:$PATH
if [ "$PKG_INSTALL_ROOT" = "/" ]; then
PKG_INSTALL_ROOT=""
fi
if [ -n "$PATCH_BUILD_DIR" -a -d "$PATCH_BUILD_DIR" ]; then
BUILD_DIR="$PATCH_BUILD_DIR/$Patch_label.$PKGINST"
else
BUILD_DIR="$PKG_INSTALL_ROOT/var/tmp/$Patch_label.$PKGINST"
fi
if [ ! -n "$PATCH_UNDO_ARCHIVE" ]; then
PATCH_UNDO_ARCHIVE="none"
fi
FILE_DIR=$BUILD_DIR/files
RELOC_DIR=$FILE_DIR/reloc
ROOT_DIR=$FILE_DIR/root
BO_Deletes=$FILE_DIR/deletes
THIS_DIR=`dirname $0`
PROTO_FILE=$BUILD_DIR/prototype
TEMP_REMOTE=$PKGSAV/$Patch_label/temp
if [ "$PATCH_PROGRESSIVE" = "true" ]; then
# remove the scripts that are left behind
install_scripts=`dirname $0`
rm $install_scripts/checkinstall \
$install_scripts/patch_checkinstall $install_scripts/patch_postinstall
# If this is being used in an old-style patch, insert
# the old-style script commands here.
#XXXOld_CommandsXXX#
exit 0
fi
#
# At this point we either have a deletes file or we don't. If we do,
# we create a prototype entry.
#
if [ -f $BO_Deletes ]; then
echo "i deletes=$BO_Deletes" >> $BUILD_DIR/prototype
fi
#
# Now delete everything in the deletes list after transferring
# the file to the backout package and the entry to the prototype
# file. Remember that the pkgmap will get the CLIENT_BASEDIR path
# but we have to actually get at it using the BASEDIR path. Also
# remember that removef will import our PKG_INSTALL_ROOT
#
Our_Deletes=$THIS_DIR/deletes
if [ -f $Our_Deletes ]; then
cd $BASEDIR
cat $Our_Deletes | while read path; do
Reg_File=0
if valpath -l $path; then
Client_Path="$CLIENT_BASEDIR/$path"
Build_Path="$RELOC_DIR/$path"
Proto_Path=$BASEDIR/$path
else # It's an absolute path
Client_Path=$path
Build_Path="$ROOT_DIR$path"
Proto_Path=$PKG_INSTALL_ROOT$path
fi
# Note: If the file isn't really there, pkgproto
# doesn't write anything.
LINE=`pkgproto $Proto_Path=$path`
ftype=`echo $LINE | nawk '{ print $1 }'`
if [ $ftype = "f" ]; then
Reg_File=1
fi
if [ $Reg_File = 1 ]; then
# Add source file to the prototype entry
if [ "$Proto_Path" = "$path" ]; then
LINE=`echo $LINE | sed -e s@$Proto_Path@$Build_Path@2`
else
LINE=`echo $LINE | sed -e s@$Proto_Path@$Build_Path@`
fi
DirName=`dirname $Build_Path`
# make room in the build tree
mkdir -p $DirName
cp -p $Proto_Path $Build_Path
fi
# Insert it into the prototype file
echo $LINE 1>>$PROTO_FILE 2>/dev/null
# Remove the file only if it's OK'd by removef
rm `removef $PKGINST $Client_Path` 1>/dev/null 2>&1
done
removef -f $PKGINST
rm $Our_Deletes
fi
#
# Unless specifically denied, make the backout package.
#
if [ "$PATCH_NO_UNDO" != "true" ]; then
cd $BUILD_DIR # We have to build from here.
if [ "$PATCH_UNDO_ARCHIVE" != "none" ]; then
STAGE_DIR="$PATCH_UNDO_ARCHIVE"
ARCHIVE_DIR="$PATCH_UNDO_ARCHIVE/$Patch_label/$PKGINST"
mkdir -p $ARCHIVE_DIR
mkdir -p $PKGSAV/$Patch_label
else
if [ -d $PKGSAV/$Patch_label ]; then
rm -r $PKGSAV/$Patch_label
fi
STAGE_DIR=$PKGSAV
ARCHIVE_DIR=$PKGSAV/$Patch_label
mkdir $ARCHIVE_DIR
fi
pkgmk -o -d $STAGE_DIR 1>/dev/null 2>&1
pkgtrans -s $STAGE_DIR $ARCHIVE_DIR/undo $PKG 1>/dev/null 2>&1
compress $ARCHIVE_DIR/undo
retcode=$?
if [ "$PATCH_UNDO_ARCHIVE" != "none" ]; then
if [ $retcode != 0 ]; then
build_remote_file "undo"
else
build_remote_file "undo.Z"
fi
fi
rm -r $STAGE_DIR/$PKG
cd ..
rm -r $BUILD_DIR
# remove the scripts that are left behind
install_scripts=`dirname $0`
rm $install_scripts/checkinstall $install_scripts/patch_\
checkinstall $install_scripts/patch_postinstall
fi
#
# Since this apparently worked, we'll mark as obsoleted the prior
# versions of this patch - installpatch deals with explicit obsoletions.
#
cd ${PKG_INSTALL_ROOT:-/}
cd var/sadm/pkg
active_base=`echo $Patch_label | nawk '
{ print substr($0, 1, match($0, "Patchvers_pfx")-1) } '`
List=`ls -d $PKGINST/save/${active_base}*`
if [ $? -ne 0 ]; then
List=""
fi
for savedir in $List; do
patch=`basename $savedir`
if [ $patch = $Patch_label ]; then
break
fi
# If we get here then the previous patch gets deleted
if [ -f $savedir/undo ]; then
mv $savedir/undo $savedir/obsolete
echo $Patch_label >> $savedir/obsoleted_by
elif [ -f $savedir/undo.Z ]; then
mv $savedir/undo.Z $savedir/obsolete.Z
echo $Patch_label >> $savedir/obsoleted_by
elif [ -f $savedir/remote ]; then
`grep . $PKGSAV/$patch/remote | sed 's/STATE=.*/STATE=obsolete/
' > $TEMP_REMOTE`
rm -f $PKGSAV/$patch/remote
mv $TEMP_REMOTE $PKGSAV/$patch/remote
rm -f $TEMP_REMOTE
echo $Patch_label >> $savedir/obsoleted_by
elif [ -f $savedir/obsolete -o -f $savedir/obsolete.Z ]; then
echo $Patch_label >> $savedir/obsoleted_by
fi
done
# If additional operations are required for this package, place
# those package-specific commands here.
#XXXSpecial_CommandsXXX#
exit 0
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