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Index: os-prober/common.sh
===================================================================
--- os-prober.orig/common.sh
+++ os-prober/common.sh
@@ -62,10 +62,14 @@ cache_progname() {
esac
}
-log() {
- cache_progname
- logger -t "$progname" "$@"
-}
+# fd_logger: bind value now, possibly after assigning default.
+eval '
+ log() {
+ cache_progname
+ echo "$progname: $@" 1>&'${fd_logger:=9}'
+ }
+'
+export fd_logger # so subshells inherit current value by default
error() {
log "error: $@"
@@ -81,10 +85,14 @@ debug() {
fi
}
-result () {
- log "result:" "$@"
- echo "$@"
-}
+# fd_result: bind value now, possibly after assigning default.
+eval '
+ result() {
+ log "result:" "$@"
+ echo "$@" 1>&'${fd_result:=1}'
+ }
+'
+export fd_result # so subshells inherit current value by default
# shim to make it easier to use os-prober outside d-i
if ! type mapdevfs >/dev/null 2>&1; then
Index: os-prober/linux-boot-prober
===================================================================
--- os-prober.orig/linux-boot-prober
+++ os-prober/linux-boot-prober
@@ -1,4 +1,12 @@
#!/bin/sh
+
+# dash shell does not have "{varname}>&1" feature that bash shell has
+# for auto-assignment of new filedescriptors.
+# It is cumbersome to write the 'eval' to use our own variables in redirections.
+# Therefore use fixed numbers.
+export fd_result=3 # file descriptor for external results
+export fd_logger=9 # file descriptor for input to logger
+
. /usr/share/os-prober/common.sh
set -e
@@ -19,6 +27,7 @@ bootuuid=
grep "^/dev/" /proc/mounts | parse_proc_mounts >"$OS_PROBER_TMP/mounted-map" || true
+( (
if [ -z "$1" ]; then
ERR=y
elif [ "$1" = btrfs -a -z "$2" ]; then
@@ -186,3 +195,5 @@ else
fi
fi
fi
+) 9>&1 | logger 1>&- # fd_logger
+) 3>&1 # fd_result
Index: os-prober/os-prober
===================================================================
--- os-prober.orig/os-prober
+++ os-prober/os-prober
@@ -1,7 +1,14 @@
#!/bin/sh
set -e
-. /usr/share/os-prober/common.sh
+# dash shell does not have "{varname}>&1" feature that bash shell has
+# for auto-assignment of new filedescriptors.
+# It is cumbersome to write the 'eval' to use our own variables in redirections.
+# Therefore use fixed numbers.
+export fd_result=3 # file descriptor for external results
+export fd_logger=9 # file descriptor for input to logger
+
+ . /usr/share/os-prober/common.sh
newns "$@"
require_tmpdir
@@ -136,6 +143,7 @@ fi
: >"$OS_PROBER_TMP/btrfs-vols"
+( (
for partition in $(partitions); do
if ! mapped="$(mapdevfs "$partition")"; then
log "Device '$partition' does not exist; skipping"
@@ -200,3 +208,5 @@ for partition in $(partitions); do
fi
fi
done
+) 9>&1 | logger 1>&- # fd_logger
+) 3>&1 # fd_result
|