[source] base-files: use procd init for urandom_seed

[LEDE Commits]

dangole pushed a commit to source.git, branch master:
https://git.lede-project.org/?p=source.git;a=commitdiff;h=35e423ca41d52c0415bfd2d781482d8cf2a9b067

commit 35e423ca41d52c0415bfd2d781482d8cf2a9b067
Author: Etienne CHAMPETIER <champetier.etienne at gmail.com>
AuthorDate: Wed Jul 20 12:22:44 2016 +0000

    base-files: use procd init for urandom_seed
    
    Previous implementation was blocking the init and
    breaking halt/reboot/sysupgrade (reported by Daniel Golle)
    
    v2: use procd logging, use set -e + trap for error handling
    
    Signed-off-by: Etienne CHAMPETIER <champetier.etienne at gmail.com>
    Tested-by: Daniel Golle <daniel at makrotopia.org>
---
 package/base-files/files/etc/init.d/urandom_seed | 33 ++++++------------------
 package/base-files/files/sbin/urandom_seed       | 20 ++++++++++++++
 2 files changed, 28 insertions(+), 25 deletions(-)

diff --git a/package/base-files/files/etc/init.d/urandom_seed b/package/base-files/files/etc/init.d/urandom_seed
index cb2eb44..17d9c13 100755
--- a/package/base-files/files/etc/init.d/urandom_seed
+++ b/package/base-files/files/etc/init.d/urandom_seed
@@ -1,29 +1,12 @@
 #!/bin/sh /etc/rc.common
 
 START=99
-
-EXTRA_COMMANDS="save"
-
-_log() {
-    logger -t urandom_seed "$1"
-}
-
-_save() {
-    touch $1.tmp || { _log "touch $1 failed"; return; }
-    chown root:root $1.tmp || { _log "chown $1 failed"; return; }
-    chmod 600 $1.tmp || { _log "chmod $1 failed"; return; }
-    getrandom 512 > $1.tmp || { _log "getrandom failed"; return; }
-    mv $1.tmp $1 || { _log "mv $1 failed"; return; }
-}
-
-save() {
-    SEED="$(uci -q get system. at system[0].urandom_seed)"
-    [ "${SEED:0:1}" == "/" ] && _save "$SEED" && _log "Seed saved ($SEED)"
-
-    SEED=/etc/urandom.seed
-    [ ! -f $SEED ] && _save "$SEED" && _log "Seed saved ($SEED)"
-}
-
-boot() {
-    save
+USE_PROCD=1
+
+start_service() {
+    procd_open_instance "urandom_seed"
+    procd_set_param command "/sbin/urandom_seed"
+    procd_set_param stdout 1
+    procd_set_param stderr 1
+    procd_close_instance
 }
diff --git a/package/base-files/files/sbin/urandom_seed b/package/base-files/files/sbin/urandom_seed
new file mode 100755
index 0000000..16d3657
--- /dev/null
+++ b/package/base-files/files/sbin/urandom_seed
@@ -0,0 +1,20 @@
+#!/bin/sh
+set -e
+
+trap '[ "$?" -eq 0 ] || echo "An error occured" >&2' EXIT
+
+save() {
+    touch "$1.tmp"
+    chown root:root "$1.tmp"
+    chmod 600 "$1.tmp"
+    getrandom 512 > "$1.tmp"
+    mv "$1.tmp" "$1"
+    echo "Seed saved ($1)"
+}
+
+SEED="$(uci -q get system. at system[0].urandom_seed || true)"
+[ "${SEED:0:1}" == "/" ] && save "$SEED"
+
+SEED=/etc/urandom.seed
+[ ! -f $SEED ] && save "$SEED"
+true