Show a progress bar when creating RAID arrays.

2 files changed, 74 insertions, 4 deletions

diff --git a/src/fripost-partman-udeb/base.sh b/src/fripost-partman-udeb/base.sh
index 976cfb6..8080bc0 100644
--- a/src/fripost-partman-udeb/base.sh
+++ b/src/fripost-partman-udeb/base.sh
@@ -1,5 +1,5 @@
 # Functions commonly used by fripost-partman shell scripts
-# Copyright © 2013 Guilhem Moulin <guilhem@fripost.org>
+# Copyright © 2013,2014 Guilhem Moulin <guilhem@fripost.org>
 #
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
@@ -596,9 +596,71 @@ getIPv4() {
 
 fripost_rmpart () {
     local device="$1" part="$2"
-    n=$( /sbin/parted -sm "$device" p
+    n=$( /sbin/parted -sm "$device" p \
        | sed -nr "/^[0-9].*:$part:[^:]*;$/ s/:.*//p" )
     [ "$n" ] || return
     log "Removing partition $n ($part) from $device"
     /sbin/parted -sm "$device" rm "$n"
 }
+
+
+
+##############################################################################
+# Create a RAID aray; add a progress bar to mdadm(8) --create
+#
+# Usage: fripost_mdadm_create device mdadm_options
+#   (equivalent to mdadm --create device mdadm_options)
+
+fripost_mdadm_create() {
+    local md="$1"; shift
+    local device level devices size info n=
+
+    /sbin/modprobe -v md_mod
+    [ -e /proc/mdstat ] || fail "/proc/mdstat missing"
+
+    log "Creating RAID device $md with $@"
+    /sbin/mdadm --create "$md" "$@"
+
+    wait_for_device "$md"
+    device=$(/usr/bin/readlink -f "$md")
+    device="${device#/dev/}"
+
+    level=$(sed -nr   "/^$device\s*:/     s/.*:\s*active (\S+) .*/\1/p"      /proc/mdstat)
+    devices=$(sed -nr "/^$device\s*:/     s/.*:\s*active \S+ //p"            /proc/mdstat)
+    size=$(sed -nr    "/^$device\s*:/ {n; s/^\s*([0-9]+)\s+blocks\s.*/\1/p}" /proc/mdstat)
+    info=$(sed -nr    "/^$device\s*:/ {n; s/^.*\s(super\s.*)/\1/p}"          /proc/mdstat)
+    if ! [ "$level" -a "$devices" -a "$size" -a "$info" ] && [ $size -gt 0 ]; then
+        log < /proc/mdstat
+        fail "Couldn't find entry $device ($md) in /proc/mdstat"
+    fi
+
+    db_subst fripost/mdadm_create_progress_title MD "$md"
+    db_subst fripost/mdadm_create_progress_title LEVEL $level
+    db_subst fripost/mdadm_create_progress_title DEVICES "$devices"
+    db_progress START 0 $size fripost/mdadm_create_progress_title
+
+    db_subst fripost/mdadm_create_progress_info CURRENT 0
+    db_subst fripost/mdadm_create_progress_info SIZE $size
+    db_subst fripost/mdadm_create_progress_info INFO "$info"
+    db_progress INFO fripost/mdadm_create_progress_info
+
+    while sed -nr "/^$device\s*:/ { p; :l; n; /^\s+\S/ {p; b l;} q }" /proc/mdstat \
+        | grep -q '\bresync\b'; do
+        n=$(sed -nr "/^$device\s*:/ {
+                        :l; n
+                        s#^\s.*\sresync\s*=\s*[0-9.]+%\s*\(([0-9]+)/$size\).*#\1#p
+                        /^\s+\S/ b l; q
+                    }" /proc/mdstat)
+        if [ "$n" ]; then
+            db_subst fripost/mdadm_create_progress_info CURRENT $n
+            db_progress INFO fripost/mdadm_create_progress_info
+            db_progress SET $n
+        fi
+        sleep 1
+    done
+    db_progress SET $size; sleep 0.25
+
+    db_progress STOP
+    db_unregister fripost/mdadm_create_progress_title
+    db_unregister fripost/mdadm_create_progress_info
+}
diff --git a/src/fripost-partman-udeb/debian/templates b/src/fripost-partman-udeb/debian/templates
index 4f4d177..3f94e14 100644
--- a/src/fripost-partman-udeb/debian/templates
+++ b/src/fripost-partman-udeb/debian/templates
@@ -4,7 +4,15 @@ Description: Seeding /dev/urandom with ${BYTES} bytes from /dev/random
 
 Template: fripost/seed_urandom_progress_info
 Type: text
-Description: This may take a while
+Description: This may take some time.
+
+Template: fripost/mdadm_create_progress_title
+Type: text
+Description: Creating ${LEVEL} array on ${MD} with ${DEVICES}
+
+Template: fripost/mdadm_create_progress_info
+Type: text
+Description: ${CURRENT}/${SIZE} blocks ${INFO}
 
 Template: debian-installer/fripost-partman/title
 Type: text
@@ -80,7 +88,7 @@ Description: Generating volume key
 
 Template: fripost/cryptsetup-genkey_progress_info
 Type: text
-Description: This will take a while if it drains the entropy pool
+Description: This may take some time.
 
 Template: fripost/mkfs_progress_title
 Type: text