[projects/geninitrd] Check if kernel supports specified INITRDFS (tested with initramfs and romfs only though)

[arekm]

commit fee61d3f4dd96bfdca441a8ab524d9928309559e
Author: Arkadiusz Miśkiewicz <arekm at maven.pl>
Date:   Fri Feb 26 18:15:14 2016 +0100

    Check if kernel supports specified INITRDFS (tested with initramfs and romfs only though)

 geninitrd | 60 +++++++++++++++++++++++++++++++++++++++++-------------------
 1 file changed, 41 insertions(+), 19 deletions(-)
---
diff --git a/geninitrd b/geninitrd
index a4de196..92a519d 100755
--- a/geninitrd
+++ b/geninitrd
@@ -1097,7 +1097,7 @@ sym_exists() {
 		return 1
 	fi
 
-	awk -vc=1 -vsymbol="$symbol" '$2 == "T" && $3 == symbol {c = 0} END {exit c}' $mapfile
+	awk -vc=1 -vsymbol="$symbol" '($2 == "T" || $2 == "t") && $3 == symbol {c = 0} END {exit c}' $mapfile
 }
 
 # find best compressor (or forced one) for initrd
@@ -1400,24 +1400,46 @@ if [ -z "$INITRDFS" ]; then
 	fi
 fi
 
-case "$INITRDFS" in
-  ext2)
-	[ -x /sbin/mke2fs ] || die "/sbin/mke2fs is missing"
-	;;
-  rom|romfs)
-	[ -x /sbin/genromfs ] || die "/sbin/genromfs is missing"
-	;;
-  cram|cramfs)
-	[ -x /sbin/mkcramfs ] || die "/sbin/mkcramfs is missing"
-	;;
-  initramfs)
-	[ -x /bin/cpio ] || die "/bin/cpio is missing"
-	[ -x /usr/bin/find ] || die "/usr/bin/find is missing"
-	;;
-  *)
-	die "Filesystem $INITRDFS on initrd is not supported"
-	;;
-esac
+check_initrd_fs() {
+	local s sfound sym p prog map=/boot/System.map-$kernel
+	case "$INITRDFS" in
+		ext2)
+			# TODO: symbols to check in case of ext2 used via ext3/4 subsystem
+			sym=init_ext2_fs
+			prog=/sbin/mke2fs
+			;;
+		rom|romfs)
+			sym=init_romfs_fs
+			prog=/sbin/genromfs
+			;;
+		cram|cramfs)
+			sym=init_cramfs_fs
+			prog=/sbin/mkcramfs
+			;;
+		initramfs)
+			sym=__initramfs_start
+			prog="/bin/cpio /usr/bin/find"
+			;;
+		*)
+			die "Filesystem $INITRDFS on initrd is not supported by geninitrd"
+			;;
+	esac
+
+	# only one is needed (for cases like ext2 via ext2 or via ext3 or via ext4 subsysytem)
+	sfound=0
+	for s in $sym; do
+		sym_exists $map $s && sfound=1
+		break
+	done
+	if [ "$sfound" -eq "0" ]; then
+		die "Filesystem $INITRDFS on initrd is not supported by kernel"
+	fi
+
+	for p in $prog; do
+		[ ! -x "$p" ] && die "$prog is missing"
+	done
+}
+check_initrd_fs
 
 if [ -L "$target" ]; then
 	target=$(readlink -f "$target")
================================================================

---- gitweb:

http://git.pld-linux.org/gitweb.cgi/projects/geninitrd.git/commitdiff/fee61d3f4dd96bfdca441a8ab524d9928309559e