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#!/bin/sh
. /usr/share/debconf/confmodule
set -e
ISO_COUNT=0
ISO_MOUNT_COUNT=0
MOUNTABLE_DEVS_COUNT=0
TOPLEVEL_DIRS_COUNT=0
log () {
logger -t hd-image-detect "$@"
}
# Finds all block devices that might have a filesystem on them.
block_devices () {
find /dev/discs/ -follow -type b
sed -e '1,2d' -e 's/ * / /g' /proc/partitions | cut -d' ' -f 5 \
| sed -e 's,^,/dev/,'
}
mount_device () {
dev_to_mount=$1
db_subst iso-scan/progress_mount DRIVE $dev_to_mount
db_progress INFO iso-scan/progress_mount
mount -t auto -o ro $dev_to_mount /hd-media 2>/dev/null
}
is_debian_iso () {
test -e /cdrom/.disk/info
}
register_cd () {
# Set the suite used by base-installer and base-config to
# the suite that is on the CD. This assumes that there will
# be no more than one distribution on the CD, and that one of the
# testing, stable, or unstable links will point to it. Since the
# CDs currently have many links, parse the Release file to get the
# actual suite name to use.
for distlink in stable testing unstable ; do
relfile=/cdrom/dists/$distlink/Release
if [ -e $relfile ] ; then
suite=$(sed -n 's/^Suite: *//p' $relfile)
log "Detected ISO with '$suite' distribution"
db_set mirror/suite $suite
db_subst iso-scan/success SUITE $suite
description=`sed -n 's/^Description: *//p' $relfile`
db_subst iso-scan/success DESCRIPTION $description
break
fi
done
}
# Try to mount a file as an iso, and see if it's a Debian cd.
try_iso () {
iso_to_try=$1
iso_device=$2
if mount -t iso9660 -o loop,ro,exec $iso_to_try /cdrom 2>/dev/null; then
log "Mounted $1"
ISO_MOUNT_COUNT=$(expr $ISO_MOUNT_COUNT + 1)
if is_debian_iso; then
# This could be more sophisticated, and try to deal
# with multiple Debian ISO's. For now, once we've got
# a Debian ISO, any Debian ISO, we're done.
register_cd $iso_to_try $iso_device
db_progress STOP
db_subst iso-scan/success FILENAME $iso_to_try
db_set iso-scan/filename $iso_to_try
db_subst iso-scan/success DEVICE $iso_device
db_input medium iso-scan/success || true
db_go || true
exit 0
else
log "Not a Debian ISO"
umount /cdrom
fi
else
log "Failed mounting $iso_to_try"
fi
}
# Try to unmount anything that was previously mounted.
umount /cdrom 2>/dev/null || true
umount /hd-media 2>/dev/null || true
# Hopefully this will find the drive.
hw-detect iso-scan/detect_progress_title || true
# Find all block devices, and get a count of them, for use in progress bar.
DEVS=$(block_devices)
DEV_COUNT=0
for dev in $DEVS; do
DEV_COUNT=$(expr $DEV_COUNT + 1)
done
log "Searching for Debian installation media..."
db_progress START 0 $DEV_COUNT iso-scan/progress_title
# Load up every filesystem known to man. The drive could have anything.
FS="ext2 ext3 reiserfs fat vfat xfs iso9660 hfs ntfs"
for fs in $FS; do
modprobe $fs >/dev/null 2>&1 || true
done
modprobe loop >/dev/null || true
mkdir /cdrom 2>/dev/null || true
mkdir /hd-media 2>/dev/null || true
log "First pass: Look for ISOs near top-level of each filesystem."
for dev in $DEVS; do
if mount_device $dev; then
db_subst iso-scan/progress_scan DRIVE $dev
log "Mounted $dev for first pass"
MOUNTABLE_DEVS="$MOUNTABLE_DEVS $dev"
MOUNTABLE_DEVS_COUNT=$(expr $MOUNTABLE_DEVS_COUNT + 1)
cd /hd-media
for dir in . *; do
if [ -d "$dir" ]; then
if [ "$dir" != "." ]; then
TOPLEVEL_DIRS_COUNT=$(expr $TOPLEVEL_DIRS_COUNT + 1)
fi
db_subst iso-scan/progress_scan DIRECTORY "$dir/"
db_progress INFO iso-scan/progress_scan
for iso in $dir/*.iso $dir/*.ISO; do
if [ -e $iso ]; then
log "Found ISO $iso on $dev"
ISO_COUNT=$(expr $ISO_COUNT + 1)
try_iso $iso $dev
fi
done
fi
done
cd /
umount /hd-media
fi
# It's possible that the ISO was written right to the front of a
# device, and not to a filesystem. (Hey, we may even be spinning
# a real CD here, though that would be pretty weird..)
try_iso $dev $dev
db_progress STEP 1
done
db_progress STOP
if [ "$MOUNTABLE_DEVS_COUNT" != 0 ]; then
# Ask about the more expensive second pass.
db_subst iso-scan/ask_second_pass NUM_FILESYSTEMS $MOUNTABLE_DEVS_COUNT
db_subst iso-scan/ask_second_pass NUM_DIRS $TOPLEVEL_DIRS_COUNT
db_input critical iso-scan/ask_second_pass || true
db_go || true
db_get iso-scan/ask_second_pass
if [ "$RET" = true ]; then
db_progress START 0 $TOPLEVEL_DIRS_COUNT iso-scan/progress_title
log "Second pass: Search whole filesystems for ISOs."
# To save time, only ones we mounted successfully before.
for dev in $MOUNTABLE_DEVS; do
if mount_device $dev; then
db_subst iso-scan/progress_scan DRIVE $dev
log "Mounted $dev for second pass"
cd /hd-media
for dir in *; do
if [ -d "$dir" ]; then
db_subst iso-scan/progress_scan DIRECTORY "$dir/"
db_progress INFO iso-scan/progress_scan
for iso in $(find $dir 2>/dev/null | grep -i '\.iso$'); do
log "Found ISO $iso on $dev"
ISO_COUNT=$(expr $ISO_COUNT + 1)
try_iso $iso $dev
done
db_progress STEP 1
fi
done
cd /
umount /hd-media
fi
done
db_progress STOP
fi
fi
# Failure. Display the best message we can about what happened.
# Let them know the second pass failed too.
if [ "$ISO_COUNT" = 0 ]; then
db_input critical iso-scan/no-isos || true
elif [ "$ISO_MOUNT_COUNT" != "$ISO_COUNT" ]; then
db_input critical iso-scan/bad-isos || true
else
db_input critical iso-scan/other-isos || true
fi
db_go || true
log "Failing with ISO_COUNT = $ISO_COUNT, MOUNTABLE_DEVS_COUNT = $MOUNTABLE_DEVS_COUNT, ISO_MOUNT_COUNT = $ISO_MOUNT_COUNT"
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