str_starts, str_replace
chr - decimal value to character
funiq - print new unique file name
mkuniqdir - create and print new unique dir
enc_nonprn_white - encode non-printable and white chars to '\xHH'
foreach_dev_until - evaluates command for every given device
modified:
foreach_uuid_until - use $___ as a place holder
---
modules.d/99base/dracut-lib.sh | 142 ++++++++++++++++++++++++++++++++++++++--
1 files changed, 135 insertions(+), 7 deletions(-)
diff --git a/modules.d/99base/dracut-lib.sh b/modules.d/99base/dracut-lib.sh
index 627d2c5..e8a7850 100755
--- a/modules.d/99base/dracut-lib.sh
+++ b/modules.d/99base/dracut-lib.sh
@@ -6,6 +6,35 @@ strstr() {
[ "${1#*$2*}" != "$1" ]
}
+# returns OK if $1 contains $2 at the beginning
+str_starts() {
+ [ "${1#$2*}" != "$1" ]
+}
+
+# converts decimal value to its ASCII character representation
+# <http://mywiki.wooledge.org/BashFAQ/071>
+chr() {
+ printf \\$(($1/64*100+$1%64/8*10+$1%8))
+}
+
+# replaces all occurrences of 'search' in 'str' with 'replacement'
+#
+# str_replace str search replacement
+#
+# example:
+# str_replace ' one two three ' ' ' '_'
+str_replace() {
+ local in="$1"; local s="$2"; local r="$3"
+ local out=''
+
+ while strstr "${in}" "$s"; do
+ chop="${in%%$s*}"
+ out="${out}${chop# }$r"
+ in="${in#*$s}"
+ done
+ echo "${out}${in}"
+}
+
getarg() {
set +x
local o line val
@@ -283,35 +312,134 @@ ip_to_var() {
esac
}
-# Evaluate command for UUIDs either given as arguments for this function or all
+# Prints unique path for potential file inside specified directory. It consists
+# of specified directory, prefix and number at the end which is incremented
+# until non-existing file is found.
+#
+# funiq dir prefix
+#
+# example:
+# # ls /mnt
+# cdrom0 cdrom1
+#
+# # funiq /mnt cdrom
+# /mnt/cdrom2
+funiq() {
+ local dir="$1"; local prefix="$2"
+ local i=0
+
+ [ -d "${dir}" ] || return 1
+
+ while [ -e "${dir}/${prefix}$i" ]; do
+ i=$(($i+1)) || return 1
+ done
+
+ echo "${dir}/${prefix}$i"
+}
+
+# Creates unique directory and prints its path. It's using funiq to generate
+# path.
+#
+# mkuniqdir subdir new_dir_name
+mkuniqdir() {
+ local dir="$1"; local prefix="$2"
+ local retdir
+
+ retdir=$(funiq "${dir}" "${prefix}") || return 1
+ until mkdir "${retdir}" 2>/dev/null; do
+ retdir=$(funiq "${dir}" "${prefix}") || return 1
+ done
+
+ echo "${retdir}"
+}
+
+# Encodes non-printable characters and spaces in a string to their hexadecimal
+# values prefixed with '\x'.
+#
+# enc_nonprn_white str
+enc_nonprn_white() {
+ local str="$1"; local i=1
+
+ while [ $i -le 32 ]; do
+ str="$(str_replace "${str}" "$(chr $i)" \\x$(printf '%02x' $i))"
+ i=$(($i+1))
+ done
+
+ echo "${str}"
+}
+
+# Evaluates command for UUIDs either given as arguments for this function or all
# listed in /dev/disk/by-uuid. UUIDs doesn't have to be fully specified. If
-# beginning is given it is expanded to all matching UUIDs. To pass full UUID
-# to your command use '${full_uuid}'. Remember to escape '$'!
+# beginning is given it is expanded to all matching UUIDs. To pass full UUID to
+# your command use '$___' as a place holder. Remember to escape '$'!
+#
+# foreach_uuid_until [ -p prefix ] command UUIDs
#
-# $1 = command to be evaluated
-# $2 = list of UUIDs separated by space
+# prefix - string to put just before $___
+# command - command to be evaluated
+# UUIDs - list of UUIDs separated by space
#
# The function returns after *first successful evaluation* of the given command
# with status 0. If evaluation fails for every UUID function returns with
# status 1.
#
# Example:
-# foreach_uuid_until "mount -U \${full_uuid} /mnt; echo OK; umount /mnt" \
+# foreach_uuid_until "mount -U \$___ /mnt; echo OK; umount /mnt" \
# "01234 f512 a235567f-12a3-c123-a1b1-01234567abcb"
foreach_uuid_until() (
cd /dev/disk/by-uuid
+ [ "$1" = -p ] && local prefix="$2" && shift 2
local cmd="$1"; shift; local uuids_list="$*"
- local uuid; local full_uuid
+ local uuid; local full_uuid; local ___
[ -n "${cmd}" ] || return 1
for uuid in ${uuids_list:-*}; do
for full_uuid in ${uuid}*; do
[ -e "${full_uuid}" ] || continue
+ ___="${prefix}${full_uuid}"
eval ${cmd} && return 0
done
done
return 1
)
+
+# Evaluates command for every given device. Every single device must be
+# specified either by path, by label prefixed with 'LABEL=' or UUID prefixed
+# with 'UUID='. UUIDs are processed by 'foreach_uuid_until'. List elements'
+# order is preserved.
+#
+# foreach_dev_until command device1 device2 ...
+#
+# The function returns after *first successful evaluation* of the given command
+# with status 0. If evaluation fails for every device, function returns with
+# status 1.
+#
+# Example:
+# foreach_dev_until "echo \$___; false" /dev/sda1 "LABEL=Linux boot" "UUID=123a"
+foreach_dev_until() {
+ local cmd="$1"; shift
+ local dev; local ___
+
+ [ -n "${cmd}" ] || return 1
+
+ if [ -n "$*" ]; then
+ for dev; do
+ if str_starts "${dev}" 'UUID='; then
+ foreach_uuid_until -p 'UUID=' "${cmd}" "${dev#UUID=*}" && \
+ return 0
+ else
+ [ -e "${dev}" ] || [ -e "/dev/disk/by-label/$(enc_nonprn_white\
+ "${dev#LABEL=}")" ] || continue
+ ___="${dev}"
+ eval ${cmd} && return 0
+ fi
+ done
+ else
+ foreach_uuid_until -p 'UUID=' "${cmd}" && return 0
+ fi
+
+ return 1
+}
--
1.7.3
--
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