git-mv.perl

   1 #!/usr/bin/perl
   2 #
   3 # Copyright 2005, Ryan Anderson <ryan@michonline.com>
   4 #                 Josef Weidendorfer <Josef.Weidendorfer@gmx.de>
   5 #
   6 # This file is licensed under the GPL v2, or a later version
   7 # at the discretion of Linus Torvalds.
   8
   9
  10 use warnings;
  11 use strict;
  12 use Getopt::Std;
  13
  14 sub usage() {
  15         print <<EOT;
  16 $0 [-f] [-n] <source> <dest>
  17 $0 [-f] [-k] [-n] <source> ... <dest directory>
  18
  19 In the first form, source must exist and be either a file,
  20 symlink or directory, dest must not exist. It renames source to dest.
  21 In the second form, the last argument has to be an existing
  22 directory; the given sources will be moved into this directory.
  23
  24 Updates the git cache to reflect the change.
  25 Use "git commit" to make the change permanently.
  26
  27 Options:
  28   -f   Force renaming/moving, even if target exists
  29   -k   Continue on error by skipping
  30        not-existing or not revision-controlled source
  31   -n   Do nothing; show what would happen
  32 EOT
  33         exit(1);
  34 }
  35
  36 # Sanity checks:
  37 my $GIT_DIR = $ENV{'GIT_DIR'} || ".git";
  38
  39 unless ( -d $GIT_DIR && -d $GIT_DIR . "/objects" &&
  40         -d $GIT_DIR . "/objects/" && -d $GIT_DIR . "/refs") {
  41     print "Git repository not found.";
  42     usage();
  43 }
  44
  45
  46 our ($opt_n, $opt_f, $opt_h, $opt_k, $opt_v);
  47 getopts("hnfkv") || usage;
  48 usage() if $opt_h;
  49 @ARGV >= 1 or usage;
  50
  51 my (@srcArgs, @dstArgs, @srcs, @dsts);
  52 my ($src, $dst, $base, $dstDir);
  53
  54 my $argCount = scalar @ARGV;
  55 if (-d $ARGV[$argCount-1]) {
  56         $dstDir = $ARGV[$argCount-1];
  57         # remove any trailing slash
  58         $dstDir =~ s/\/$//;
  59         @srcArgs = @ARGV[0..$argCount-2];
  60
  61         foreach $src (@srcArgs) {
  62                 $base = $src;
  63                 $base =~ s/^.*\///;
  64                 $dst = "$dstDir/". $base;
  65                 push @dstArgs, $dst;
  66         }
  67 }
  68 else {
  69     if ($argCount != 2) {
  70         print "Error: moving to directory '"
  71             . $ARGV[$argCount-1]
  72             . "' not possible; not exisiting\n";
  73         usage;
  74     }
  75     @srcArgs = ($ARGV[0]);
  76     @dstArgs = ($ARGV[1]);
  77     $dstDir = "";
  78 }
  79
  80 my (@allfiles,@srcfiles,@dstfiles);
  81 my $safesrc;
  82 my (%overwritten, %srcForDst);
  83
  84 $/ = "\0";
  85 open(F,"-|","git-ls-files","-z")
  86         or die "Failed to open pipe from git-ls-files: " . $!;
  87
  88 @allfiles = map { chomp; $_; } <F>;
  89 close(F);
  90
  91
  92 my ($i, $bad);
  93 while(scalar @srcArgs > 0) {
  94     $src = shift @srcArgs;
  95     $dst = shift @dstArgs;
  96     $bad = "";
  97
  98     if ($opt_v) {
  99         print "Checking rename of '$src' to '$dst'\n";
 100     }
 101
 102     unless (-f $src || -l $src || -d $src) {
 103         $bad = "bad source '$src'";
 104     }
 105
 106     $safesrc = quotemeta($src);
 107     @srcfiles = grep /^$safesrc(\/|$)/, @allfiles;
 108
 109     $overwritten{$dst} = 0;
 110     if (($bad eq "") && -e $dst) {
 111         $bad = "destination '$dst' already exists";
 112         if ($opt_f) {
 113             # only files can overwrite each other: check both source and destination
 114             if (-f $dst && (scalar @srcfiles == 1)) {
 115                 print "Warning: $bad; will overwrite!\n";
 116                 $bad = "";
 117                 $overwritten{$dst} = 1;
 118             }
 119             else {
 120                 $bad = "Can not overwrite '$src' with '$dst'";
 121             }
 122         }
 123     }
 124
 125     if (($bad eq "") && ($src eq $dstDir)) {
 126         $bad = "can not move directory '$src' into itself";
 127     }
 128
 129     if ($bad eq "") {
 130         if (scalar @srcfiles == 0) {
 131             $bad = "'$src' not under version control";
 132         }
 133     }
 134
 135     if ($bad eq "") {
 136        if (defined $srcForDst{$dst}) {
 137            $bad = "can not move '$src' to '$dst'; already target of ";
 138            $bad .= "'".$srcForDst{$dst}."'";
 139        }
 140        else {
 141            $srcForDst{$dst} = $src;
 142        }
 143     }
 144
 145     if ($bad ne "") {
 146         if ($opt_k) {
 147             print "Warning: $bad; skipping\n";
 148             next;
 149         }
 150         print "Error: $bad\n";
 151         usage();
 152     }
 153     push @srcs, $src;
 154     push @dsts, $dst;
 155 }
 156
 157 # Final pass: rename/move
 158 my (@deletedfiles,@addedfiles,@changedfiles);
 159 while(scalar @srcs > 0) {
 160     $src = shift @srcs;
 161     $dst = shift @dsts;
 162
 163     if ($opt_n || $opt_v) { print "Renaming $src to $dst\n"; }
 164     if (!$opt_n) {
 165         rename($src,$dst)
 166             or die "rename failed: $!";
 167     }
 168
 169     $safesrc = quotemeta($src);
 170     @srcfiles = grep /^$safesrc(\/|$)/, @allfiles;
 171     @dstfiles = @srcfiles;
 172     s/^$safesrc(\/|$)/$dst$1/ for @dstfiles;
 173
 174     push @deletedfiles, @srcfiles;
 175     if (scalar @srcfiles == 1) {
 176         # $dst can be a directory with 1 file inside
 177         if ($overwritten{$dst} ==1) {
 178             push @changedfiles, $dstfiles[0];
 179
 180         } else {
 181             push @addedfiles, $dstfiles[0];
 182         }
 183     }
 184     else {
 185         push @addedfiles, @dstfiles;
 186     }
 187 }
 188
 189 if ($opt_n) {
 190         print "Changed  : ". join(", ", @changedfiles) ."\n";
 191         print "Adding   : ". join(", ", @addedfiles) ."\n";
 192         print "Deleting : ". join(", ", @deletedfiles) ."\n";
 193         exit(1);
 194 }
 195
 196 my $rc;
 197 if (scalar @changedfiles >0) {
 198         $rc = system("git-update-index","--",@changedfiles);
 199         die "git-update-index failed to update changed files with code $?\n" if $rc;
 200 }
 201 if (scalar @addedfiles >0) {
 202         $rc = system("git-update-index","--add","--",@addedfiles);
 203         die "git-update-index failed to add new names with code $?\n" if $rc;
 204 }
 205 $rc = system("git-update-index","--remove","--",@deletedfiles);
 206 die "git-update-index failed to remove old names with code $?\n" if $rc;