[make-initrd] [PATCH 3/3] feature/network: Use flock-based locking

[Alexey Gladkov <gladkov.alexey@gmail.com>]

Signed-off-by: Alexey Gladkov <gladkov.alexey@gmail.com>
---
 features/network/data/lib/network/config         |  8 --------
 features/network/data/lib/network/hostname       | 10 +++-------
 features/network/data/lib/network/resolvconf     | 10 +++-------
 features/network/data/lib/network/udhcpc4.script | 12 ++++++------
 4 files changed, 12 insertions(+), 28 deletions(-)

diff --git a/features/network/data/lib/network/config b/features/network/data/lib/network/config
index c3a8dbb1..418b03b6 100755
--- a/features/network/data/lib/network/config
+++ b/features/network/data/lib/network/config
@@ -1,14 +1,6 @@
 #!/bin/bash -efu
 
 . shell-error
-
-lock="/tmp/$PROG.lock"
-while ! mkdir -- "$lock" >/dev/null 2>&1; do
-	sleep 0.1
-done
-unlock() { rmdir "$lock"; }
-trap unlock EXIT
-
 . network-sh-functions
 
 PROG="$PROG: $NET_IF"
diff --git a/features/network/data/lib/network/hostname b/features/network/data/lib/network/hostname
index 1160fba0..3597a495 100755
--- a/features/network/data/lib/network/hostname
+++ b/features/network/data/lib/network/hostname
@@ -1,18 +1,12 @@
 #!/bin/bash -efu
 
 . shell-error
+. shell-locks
 . network-sh-functions
 
 [ "$NET_EV_ACTION" = update ] ||
 	exit 0
 
-lock="/tmp/$PROG.lock"
-while ! mkdir -- "$lock" >/dev/null 2>&1; do
-	sleep 0.1
-done
-unlock() { rmdir "$lock"; }
-trap unlock EXIT
-
 PROG="$PROG: $NET_IF"
 message_time=1
 
@@ -20,6 +14,8 @@ get_iface_confdir &&
 	[ -f "$confdir/hostname" ] ||
 	exit 0
 
+fd_lock 90 "$0"
+
 name=
 read -r name < "$confdir/hostname" ||:
 
diff --git a/features/network/data/lib/network/resolvconf b/features/network/data/lib/network/resolvconf
index e6e14602..67ccb8ab 100755
--- a/features/network/data/lib/network/resolvconf
+++ b/features/network/data/lib/network/resolvconf
@@ -1,18 +1,12 @@
 #!/bin/bash -efu
 
 . shell-error
+. shell-locks
 . network-sh-functions
 
 [ "$NET_EV_ACTION" = update ] ||
 	exit 0
 
-lock="/tmp/$PROG.lock"
-while ! mkdir -- "$lock" >/dev/null 2>&1; do
-	sleep 0.1
-done
-unlock() { rmdir "$lock"; }
-trap unlock EXIT
-
 PROG="$PROG: $NET_IF"
 message_time=1
 
@@ -20,6 +14,8 @@ get_iface_confdir &&
 	[ -f "$confdir/resolv.conf" ] ||
 	exit 0
 
+fd_lock 90 "$0"
+
 message "write resolv.conf"
 
 tmp="$(mktemp "/etc/resolv.conf.XXXXXX")"
diff --git a/features/network/data/lib/network/udhcpc4.script b/features/network/data/lib/network/udhcpc4.script
index dcb1f74c..bd1b4779 100755
--- a/features/network/data/lib/network/udhcpc4.script
+++ b/features/network/data/lib/network/udhcpc4.script
@@ -1,5 +1,7 @@
 #!/bin/bash -efu
 
+. shell-locks
+
 STATE="$1"
 
 PROG="${0##*/}"
@@ -9,11 +11,9 @@ V="${CMDNAME##udhcpc}"
 INTERFACE="${interface-}"
 
 lock="/tmp/$CMDNAME.$INTERFACE.lock"
-while ! mkdir -- "$lock" >/dev/null 2>&1; do
-	sleep 0.1
-done
-unlock() { rmdir "$lock"; }
-trap unlock EXIT
+[ -d "$lock" ] || mkdir -p -- "$lock"
+
+fd_lock 90 "$lock"
 
 logfile=$(
 	. /.initrd/initenv
@@ -148,4 +148,4 @@ case "$STATE" in
 	*)
 		exit 0
 		;;
-esac
+esac 90<&-
-- 
2.33.8