[PATCH v2 2/5] util: add new function copy

[Jonatan Schlag <jonatan.schlag@ipfire.org>]

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Just one short note, I could also insted of rmoving the destintaion if she exists,
allow fwrite to overired files. I did not do this because it would first maybe break code
when the function fwrite is used. Second it is easier to remove the destintaion and
so allow fwrite writing the content to a plain file, then changing the function so that fwrite override files.
It is easy to remove a file bevore but appending to a file with a function that overried files is not possible.
So I think it is the best to keep this feature of fwrite and when somebody wants to override a file he has to remove it before.

Signed-off-by: Jonatan Schlag <jonatan.schlag(a)ipfire.org>
---
 src/functions/functions.util | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

diff --git a/src/functions/functions.util b/src/functions/functions.util
index 3bcd00f..7f691e0 100644
--- a/src/functions/functions.util
+++ b/src/functions/functions.util
@@ -766,3 +766,29 @@ hex2dec() {
 dec2hex() {
 	printf "%02x\n" "${1}"
 }
+
+copy() {
+	# This function just copy config files
+	assert [ $# -eq 2 ]
+	local src=${1}
+	local dst=${2}
+
+	# Wo do the decleration and the initialisation in two lines to get the return code of fread
+	local data
+	data=$(fread "${src}")
+	if [ ! $? -eq 0 ]; then
+		log ERROR "Could not read data from ${src}"
+		return ${EXIT_ERROR}
+	fi
+
+	# If the file exist we will overwrite it
+	# fwrite would just append the contentet to the end of the file
+	if [ -f ${dst} ]; then
+		rm -f ${dst}
+	fi
+
+	if ! fwrite "${dst}" "${data}"; then
+		log ERROR "Could not write data to ${dst}"
+		return ${EXIT_ERROR}
+	fi
+}
-- 
2.6.3