[PATCH v2] initramfs: print error and shell out for unsupported content

[Alexander Holler <holler@ahsoftware.de>]

The initramfs generation is broken for file and directory names which contain
colons or spaces. Print an error and don't try to continue.

Tests:

cd linux
make defconfig
echo 'CONFIG_BLK_DEV_INITRD=y' >> .config
echo 'CONFIG_INITRAMFS_ROOT_UID=0' >>.config
echo 'CONFIG_INITRAMFS_ROOT_GID=0' >>.config
echo 'CONFIG_INITRAMFS_COMPRESSION_NONE=y' >>.config
echo 'CONFIG_INITRAMFS_SOURCE="/tmp/bugroot"' >>.config

Problem with colons:

mkdir -p /tmp/bugroot/a:b
make -j4 bzImage # no error
make bzImage # try again, oops

Problem with spaces:

mkdir -p /tmp/bugroot/a\ b
make -j4 bzImage # no error
zcat usr/initramfs_data.cpio.gz | cpio --extract --list # oops, no content

Signed-off-by: Alexander Holler <holler@ahsoftware.de>
---
 Silly and trivial changes in v2: Fixed a typo and added 'colons and spaces'

 scripts/gen_initramfs_list.sh | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/scripts/gen_initramfs_list.sh b/scripts/gen_initramfs_list.sh
index 17fa901..8f4c145 100644
--- a/scripts/gen_initramfs_list.sh
+++ b/scripts/gen_initramfs_list.sh
@@ -171,6 +171,18 @@ dir_filelist() {
 	${dep_list}header "$1"
 
 	srcdir=$(echo "$1" | sed -e 's://*:/:g')
+
+	# Files and directories with spaces and colons are unsupported.
+	local unsupported=$(find "${srcdir}" -regex '.*\(:\| \).*')
+	if [ ! -z "${unsupported}" ]; then
+		printf "ERROR: Unable to handle files/directories with " >&2
+		printf "unsupported characters (spaces and colons).\n" >&2
+		printf "Please use other ways to generate a cpio-archive. " >&2
+		printf "Unsupported files and directories are:\n" >&2
+		printf "$unsupported\n" >&2
+		exit 1
+	fi
+
 	dirlist=$(find "${srcdir}" -printf "%p %m %U %G\n")
 
 	# If $dirlist is only one line, then the directory is empty
-- 
1.8.3.1