mkcvsbck

   1 #!/usr/bin/env bash
   2
   3 #=======================================================================
   4 # mkcvsbck
   5 # File ID: ed0eac02-5d3f-11df-9313-90e6ba3022ac
   6 # I’m getting spoiled by having a text-base around when working in
   7 # Subversion, CVS doesn’t have that. So if I’ve edited a file without
   8 # making a copy of the original, a new version of the file has to be
   9 # checked out manually. This script automates that task.
  10 #=======================================================================
  11
  12 fname=$1
  13 fbck=$fname.bck
  14 ftmp=$fname.tmp
  15
  16 if [ "$fname" = "" ]; then
  17     echo "Syntax: $0 filename" >&2
  18     exit 1
  19 fi
  20
  21 if [ -e $fbck ]; then
  22     echo -n "$0: $fbck: File already exists. Press Enter to remove it, Ctrl-C to abort..." >&2
  23     read
  24     rm -v $fbck || { echo "$0: $fbck: Cannot remove file" >&2; exit 1; }
  25 fi
  26
  27 if [ -e $ftmp ]; then
  28     echo "$0: $ftmp: Temporary file already exists" >&2
  29     exit 1
  30 fi
  31
  32 if [ ! -f $fname ]; then
  33     echo "$0: $fname: Not a regular file" >&2
  34     exit 1
  35 fi
  36
  37 mv -v $fname $ftmp || { echo "$0: mv $fname $ftmp: Error when renaming to tempfile" >&2; exit 1; }
  38 cvs update $fname
  39
  40 if [ ! -e $fname ]; then
  41     echo "$0: $fname: Yikes! Couldn’t check out original file, moving tempfile back" >&2
  42     mv -v $ftmp $fname || { echo "$0: mv $ftmp $fname: Shit! Unable to rename tempfile to workfile" >&2; }
  43     exit 1
  44 fi
  45
  46 mv -v $fname $fbck || { echo "$0: mv $fname $fbck: Couldn’t rename to backup file" >&2; exit 1; }
  47 mv -v $ftmp $fname || { echo "$0: mv $ftmp $fname: Couldn’t rename tempfile to workfile" >&2; exit 1; }
  48
  49 ls -la $fname $fbck