nixos/stage-1: Added boot.initrd.logCommands

1 files changed, 26 insertions, 0 deletions

diff --git a/nixos/modules/system/boot/stage-1-init.sh b/nixos/modules/system/boot/stage-1-init.sh
index 95df0ace1ca4..94cecdf1fd79 100644
--- a/nixos/modules/system/boot/stage-1-init.sh
+++ b/nixos/modules/system/boot/stage-1-init.sh
@@ -71,6 +71,24 @@ mount -t devtmpfs -o "size=@devSize@" devtmpfs /dev
 mkdir -p /run
 mount -t tmpfs -o "mode=0755,size=@runSize@" tmpfs /run
 
+# Optionally log the script output to /dev/kmsg or /run/log/stage-1-init.log 
+if test -n "@logCommands@"; then
+    mkdir -p /tmp
+    mkfifo /tmp/stage-1-init.log.fifo
+    logOutFd=8 && logErrFd=9
+    eval "exec $logOutFd>&1 $logErrFd>&2"
+    if test -w /dev/kmsg; then
+        tee -i < /tmp/stage-1-init.log.fifo /proc/self/fd/"$logOutFd" | while read line; do
+            if test -n "$line"; then
+                echo "stage-1-init: $line" > /dev/kmsg
+            fi
+        done &
+    else
+        mkdir -p /run/log
+        tee -i < /tmp/stage-1-init.log.fifo /run/log/stage-1-init.log &
+    fi
+    exec > /tmp/stage-1-init.log.fifo 2>&1
+fi
 
 # Process the kernel command line.
 export stage2Init=/init
@@ -415,6 +433,14 @@ fi
 # Stop udevd.
 udevadm control --exit
 
+# Reset the logging file descriptors.
+# Do this just before pkill, which will kill the tee process.
+if test -n "@logCommands@"
+then
+    exec 1>&$logOutFd 2>&$logErrFd
+    eval "exec $logOutFd>&- $logErrFd>&-"
+fi
+
 # Kill any remaining processes, just to be sure we're not taking any
 # with us into stage 2. But keep storage daemons like unionfs-fuse.
 pkill -9 -v -f '@'