176 lines
4.1 KiB
Bash
Executable File
176 lines
4.1 KiB
Bash
Executable File
#!/bin/sh
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# Copyright (c) 2010, 2011 George Danchev <danchev@spnet.net>
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# Copyright (c) 2010, 2011 Thomas Schmitt <scdbackup@gmx.net>
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# This script is distributed according to the terms of the GNU GPL v2.
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# This should be better rewritten in C at some future point. Ref: pwd code.
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# Create a list of MD5sums encoded in hexidecimal format and print to standard output
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# Format Description
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# A line in the emerging file is to be composed as follows:
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#
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# The MD5 checksum of the file content must be encoded in 32 hex digits
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# [0-9afAF]
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#
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# Next come two blanks.
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#
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# The byte size of the file content must be encoded in 12 decimal digits
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# or blanks.
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#
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# Next come two blanks.
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#
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# The rest of the line up to the newline character is a semi-literal file
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# address. Its basename has to be the same as the basename of the data file
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# when it is used as one of the input files for the jigdo file generator.
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# The semi-literal address and the address mapping define what will be
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# listed as file address in the jigdo file.
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# The address may bear at its start a literal text that shall be recognized by
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# the address mapping (e.g. -jigdo-map) of the jigdo file generator.
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# The rest of the address must be usable as file address in both situations:
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# When the jigdo file gets generated, and when the jigdo file gets read
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# to inflate the template file into the original payload image.
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# The address mappings at both occasions can be used to adapt to a change
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# of the absolute location of the listed files.
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# Between both mappings, the parent directory is represented by a symbolic
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# text, like "Debian:".
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# A simple strategy to cope with this is to write absolute paths into the
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# .md5 file, and to use matching absolute paths in the -jigdo-map
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# directives. Keep in mind that mapping is purely literal. Symbolic links
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# are neither resolved nor can they confuse the mapping.
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set -e
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SELF=jigdo-gen-md5-list
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VER=0.2
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OPT_ABSOLUTE=1
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# On FreeBSD there is "md5" rather than "md5sum".
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# Furthermore, the FreeBSD shell reports missing commands to inherited stderr,
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# regardless that the attempt itself has redirected stderr. Thus a sub shell
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# is needed to hide the protest.
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if ( md5sum --help ) >/dev/null 2>&1
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then
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md5_cmd=md5sum
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elif ( md5 -s test ) >/dev/null 2>&1
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then
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md5_cmd=md5
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else
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echo "$0 : Programs md5sum and md5 failed to work" >&2
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exit 2
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fi
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usage() {
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cat << USAGE
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usage: $SELF [option] DIR FILE ...
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-a, --make-absolute make absolute paths, avoiding any symlinks (default)
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-l, --keep-literal leave paths untouched, literally as supplied
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-v, --version print version
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-h, --help print help
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-e, --examples print examples
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USAGE
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}
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examples() {
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cat << EXAMPLES
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examples:
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$SELF datadir datafile
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$SELF --keep-literal datadir datafile
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find . -type f | xargs $SELF
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find . -exec $SELF '{}' ';'
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EXAMPLES
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}
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md5list() {
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item="$1"
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if test $OPT_ABSOLUTE -eq 1; then
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dn=`dirname "$item"` # dirname
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fn=`basename "$item"` # filename
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od=`pwd -P` # old dir
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cd "$dn" || exit 1
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item=`pwd -P`/"$fn" # absolute physical file path, avoiding all symlinks
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cd "$od" || exit 1
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fi
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if test "$md5_cmd" = "md5sum"
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then
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MD5=`md5sum "$item" | awk '{print $1}'`
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elif test "$md5_cmd" = "md5"
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then
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MD5=`md5 -q "$item"`
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else
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echo "$0 : No MD5 program found" >&2
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exit 2
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fi
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SIZ=`ls -ld "$item" | awk '{print $5}'`
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printf '%32s %12s %s\n' "$MD5" "$SIZ" "$item"
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}
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walkdir() {
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DR="$1"
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for item in `find "$DR" -type f`
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do
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md5list "$item"
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done
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}
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# main()
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if test "$1" = "" ; then
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usage
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exit 1
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fi
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case "$1" in
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--make-absolute|-a)
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OPT_ABSOLUTE=1;
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shift;
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;;
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--keep-literal|-l)
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OPT_ABSOLUTE=0;
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shift;
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;;
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--version|-v)
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printf '%s %s\n' "$SELF" "$VER"
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exit 0
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;;
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--help|-h)
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usage
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exit 0
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;;
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--examples|-e)
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examples
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exit 0
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# *)
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# usage
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# exit 1
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# ;;
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esac
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for i in "$@"
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do
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if test -d "$i" ; then
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DR="$i"
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if test $OPT_ABSOLUTE -eq 1; then
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od=`pwd -P` # old dir
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cd "$DR" || exit 1
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DR=`pwd -P` # absolute physical dir path, avoiding all symlinks
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cd "$od" || exit 1
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fi
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walkdir "$DR"
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elif test -f "$i" ; then
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FL="$i"
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md5list "$FL"
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else
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usage
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exit 1
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fi;
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done
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exit 0
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