Adding upstream version 1.154.6.

[live-boot-grml.git] / scripts / live-helpers

diff --git a/scripts/live-helpers b/scripts/live-helpers
index 70c7f34..8970834 100644 (file)
--- a/scripts/live-helpers
+++ b/scripts/live-helpers
@@ -77,7 +77,7 @@ get_fstype ()
            return
        fi
 
-       eval $(fstype < ${1})
+       eval $(fstype ${1} 2>/dev/null)
 
        if [ "${FSTYPE}" != "unknown" ]
        then
@@ -146,7 +146,7 @@ fs_size ()
                        mountp="/mnt/tmp_fs_size"
 
                        mkdir -p "${mountp}"
-                       mount -n -t $(get_fstype "${dev}") -o ro "${dev}" "${mountp}"
+                       mount -t $(get_fstype "${dev}") -o ro "${dev}" "${mountp}" || log_warning_msg "cannot mount -t $(get_fstype ${dev}) -o ro ${dev} ${mountp}"
 
                        doumount=1
                fi
@@ -163,7 +163,7 @@ fs_size ()
 
        if [ -n "${doumount}" ]
        then
-               umount "${mountp}"
+               umount "${mountp}" || log_warning_msg "cannot umount ${mountp}"
                rmdir "${mountp}"
        fi
 
@@ -206,7 +206,7 @@ setup_loop ()
                        dev=$(sys2dev "${loopdev}")
                        options=''
 
-                       if [ -n ${readonly} ]
+                       if [ -n "${readonly}" ]
                        then
                                if losetup --help 2>&1 | grep -q -- "-r\b"
                                then
@@ -269,22 +269,42 @@ try_mount ()
        dev="${1}"
        mountp="${2}"
        opts="${3}"
+       fstype="${4}"
 
        old_mountp="$(where_is_mounted ${dev})"
 
        if [ -n "${old_mountp}" ]
        then
-               mount -n -o remount,"${opts}" "${dev}" "${old_mountp}" || panic "Remounting ${dev} ${opts} on ${old_mountp} failed"
-               mount -n -o bind "${old_mountp}" "${mountp}" || panic "Cannot bind-mount ${old_mountp} on ${mountp}"
+               if [ "${opts}" != "ro" ]
+               then
+                       mount -o remount,"${opts}" "${dev}" "${old_mountp}" || panic "Remounting ${dev} ${opts} on ${old_mountp} failed"
+               fi
+
+               mount -o bind "${old_mountp}" "${mountp}" || panic "Cannot bind-mount ${old_mountp} on ${mountp}"
        else
-               mount -n -t $(get_fstype "${dev}") -o "${opts}" "${dev}" "${mountp}" || panic "Cannot mount ${dev} on ${mountp}"
+               if [ -z "${fstype}" ]
+               then
+                       fstype=$(get_fstype "${dev}")
+               fi
+               mount -t "${fstype}" -o "${opts}" "${dev}" "${mountp}" || panic "Cannot mount ${dev} on ${mountp}, fstype=${fstype}, options=${opts}"
        fi
 }
 
 find_cow_device ()
 {
+       # Returns a device containing a partition labeled "${pers_label}" or containing a file named the same way
+       #  in the latter case the partition containing the file is left mounted
+       #  if is not in black_listed_devices
        pers_label="${1}"
        cow_backing="/${pers_label}-backing"
+       black_listed_devices="${2}"
+
+       if [ -z "${PERSISTENT_PATH}" ]
+       then
+               pers_fpath=${cow_backing}/${pers_label}
+       else
+               pers_fpath=${cow_backing}/${PERSISTENT_PATH}/${pers_label}
+       fi
 
        for sysblock in $(echo /sys/block/* | tr ' ' '\n' | grep -v loop | grep -v ram | grep -v fd)
        do
@@ -292,20 +312,36 @@ find_cow_device ()
                do
                        devname=$(sys2dev "${dev}")
 
+                       if echo "${black_listed_devices}" | grep -q "${devname}"
+                       then
+                               # skip this device enterely
+                               break
+                       fi
+
                        if [ "$(/lib/udev/vol_id -l ${devname} 2>/dev/null)" = "${pers_label}" ]
                        then
                                echo "${devname}"
                                return
                        fi
 
+                       if [ "${PERSISTENT}" = "nofiles" ]
+                       then
+                               # do not mount the device to find for image files
+                               # just skip this
+                               break
+                       fi
+
                        case "$(get_fstype ${devname})" in
                                vfat|ext2|ext3|jffs2)
                                        mkdir -p "${cow_backing}"
-                                       try_mount "${devname}" "${cow_backing}" "rw"
+                                       if ! try_mount "${devname}" "${cow_backing}" "rw"
+                                       then
+                                               break
+                                       fi
 
-                                       if [ -f "${cow_backing}/${pers_label}" ]
+                                       if [ -f "${pers_fpath}" ]
                                        then
-                                               echo $(setup_loop "${cow_backing}/${pers_label}" "loop" "/sys/block/loop*")
+                                               echo $(setup_loop "${pers_fpath}" "loop" "/sys/block/loop*")
                                                return 0
                                        else
                                                umount ${cow_backing}
@@ -320,11 +356,12 @@ find_cow_device ()
 
 find_files ()
 {
-       # return the first of ${filenames} found on vfat and ext2/ext3 devices
+       # return the a string composed by device name, mountpoint an the first of ${filenames} found on a supported partition
        # FIXME: merge with above function
 
        filenames="${1}"
        snap_backing="/snap-backing"
+       black_listed_devices="${2}"
 
        for sysblock in $(echo /sys/block/* | tr ' ' '\n' | grep -v loop | grep -v ram | grep -v fd)
        do
@@ -333,19 +370,28 @@ find_files ()
                        devname=$(sys2dev "${dev}")
                        devfstype="$(get_fstype ${devname})"
 
+                       if echo "${black_listed_devices}" | grep -q "${devname}"
+                       then
+                               # skip this device enterely
+                               break
+                       fi
+
                        if is_supported_fs ${devfstype}
                        then
                                mkdir -p "${snap_backing}"
-                               try_mount "${devname}" "${snap_backing}" "ro"
 
-                               for filename in ${filenames}
+                               if try_mount "${devname}" "${snap_backing}" "ro" "${devfstype}"
+                               then
+                                       for filename in ${filenames}
                                        do
-                                       if [ -f "${snap_backing}/${filename}" ]
-                                       then
-                                               echo "${devname} ${snap_backing} ${filename}"
-                                               return 0
-                                       fi
-                               done
+                                               if [ -f "${snap_backing}/${filename}" ]
+                                               then
+                                                       echo "${devname} ${snap_backing} ${filename}"
+                                                       umount ${snap_backing}
+                                                       return 0
+                                               fi
+                                       done
+                               fi
 
                                umount ${snap_backing}
                        fi