2a88ad712e
* Further cleanup on cpv script; add back a ln_or_cp function and use it to cp only when ln fails for all instances of linking/copying in the script; better handling of case where the unversioned dest file does not exist but version versions of the file DO exst. * cpv: remove local declarations to be Posix-compliant
108 lines
2.3 KiB
Bash
Executable File
108 lines
2.3 KiB
Bash
Executable File
#!/bin/sh
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# cpv file dest
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# could extend with -r or copying multiple files
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#define ln_or_cp function - try to hardlink and if that fails copy source to dest
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ln_or_cp () {
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ln_or_cp_src="$1"
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ln_or_cp_dest="$2"
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ln "$ln_or_cp_src" "$ln_or_cp_dest" >/dev/null 2>&1
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if [ $? -eq 0 ]
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then
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return 0
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else
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cp -p "$ln_or_cp_src" "$ln_or_cp_dest"
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return $?
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fi
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}
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# end of funtion definitions
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file="$1"
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dest="$2"
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if [ ! -f "$file" ]; then
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echo "Error: no such file "$file". Exiting."
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exit 1
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fi
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# if dest is a directory, add the source file name
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if [ -d "$dest" ]; then
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dest=$dest/`basename $file`
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fi
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# if (the new) $dest is a directory, then just bail
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if [ -d "$dest" ]; then
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echo "Error: destination file ($dest) is a directory. Exiting."
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exit 1
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fi
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# if no such file $dest or dest.~[0-9]*~ then just link or copy
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# without adding version info
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# THEN EXIT
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if [ ! -f "$dest" ] && ! ls "$dest".~[0-9]*~ >/dev/null 2>&1
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then
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ln_or_cp $file $dest
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res=$?
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if [ $res -eq 0 ]
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then
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msg_start="Added"
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else
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msg_start="Error: failed to add"
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fi
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echo "$msg_start $(basename $dest) to $(dirname $dest)"
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exit $res
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fi
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# find maximum version of dest
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max=0
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for vf in "$dest".~[1-9]*~
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do vn=`echo $vf | sed -e 's/^.*\.~\([1-9][0-9]*\)~$/\1/'`
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if [ -f $dest.~$vn~ ]; then
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if [ $max -lt $vn ]; then
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max=$vn
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fi
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fi
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done
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if [ $max -eq 0 ]; then # no current versions
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mv $dest $dest.~1~ # change version to version 1
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new=2
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else
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if cmp -q $dest $dest.~$max~ >/dev/null 2>&1
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then # they're different
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max=`expr $max + 1` # make newer version
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mv $dest $dest.~$max~
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new=`expr $max + 1`
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else # dest and dest.~nn~ are equal so
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rm $dest # delete dest leave old version behind
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new=`expr $max + 1`
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fi
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fi
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# make new version and link or copy it.
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# If link or copy fails, then exit with error code
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ln_or_cp $file $dest.~$new~
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res=$?
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if [ $res -eq 0 ]
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then
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echo "Added $(basename $dest.~$new~) to $(dirname $dest.~$new~)"
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else
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echo "Error: failed to add $(basename $dest.~$new~) to $(dirname $dest.~$new~)."
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exit $res
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fi
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# hardlink latest version to unversioned filename
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rm -f $dest
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ln $dest.~$new~ $dest
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if [ $? -eq 0 ]
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then
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msg_start="Linked"
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else
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msg_start="Warning: failed to link"
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fi
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echo "$msg_start $(basename $dest) to $(basename $dest.~$new~) in $(dirname $dest)"
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exit 0
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