$ hg init a

  $ cd a

  $ cp "$TESTDIR/binfile.bin" .

  $ hg add binfile.bin

  $ hg ci -m 'add binfile.bin'

  $ echo >> binfile.bin

  $ hg ci -m 'change binfile.bin'

  $ hg revert -r 0 binfile.bin

  $ hg ci -m 'revert binfile.bin'

  $ hg cp binfile.bin nonbinfile

  $ echo text > nonbinfile

  $ hg ci -m 'make non-binary copy of binary file'

  $ hg diff --nodates -r 0 -r 1

  diff -r 48b371597640 -r acea2ab458c8 binfile.bin

  Binary file binfile.bin has changed

  $ hg diff --nodates -r 0 -r 2

  $ hg diff --git -r 0 -r 1

  diff --git a/binfile.bin b/binfile.bin

  index 37ba3d1c6f17137d9c5f5776fa040caf5fe73ff9..58dc31a9e2f40f74ff3b45903f7d620b8e5b7356

  GIT binary patch

  literal 594

  zc$@)J0<HatP)<h;3K|Lk000e1NJLTq000mG000mO0ssI2kdbIM00009a7bBm000XU

  z000XU0RWnu7ytkO2XskIMF-Uh9TW;VpMjwv0005-Nkl<ZD9@FWPs=e;7{<>W$NUkd

  zX$nnYLt$-$V!?uy+1V%`z&Eh=ah|duER<4|QWhju3gb^nF*8iYobxWG-qqXl=2~5M

  z*IoDB)sG^CfNuoBmqLTVU^<;@nwHP!1wrWd`{(mHo6VNXWtyh{alzqmsH*yYzpvLT

  zLdY<T=ks|woh-`&01!ej#(xbV1f|pI*=%;d-%F*E*X#ZH`4I%6SS+$EJDE&ct=8po

  ziN#{?_j|kD%Cd|oiqds`xm@;oJ-^?NG3Gdqrs?5u*zI;{nogxsx~^|Fn^Y?Gdc6<;

  zfMJ+iF1J`LMx&A2?dEwNW8ClebzPTbIh{@$hS6*`kH@1d%Lo7fA#}N1)oN7`gm$~V

  z+wDx#)OFqMcE{s!JN0-xhG8ItAjVkJwEcb`3WWlJfU2r?;Pd%dmR+q@mSri5q9_W-

  zaR2~ECX?B2w+zELozC0s*6Z~|QG^f{3I#<`?)Q7U-JZ|q5W;9Q8i_=pBuSzunx=U;

  z9C)5jBoYw9^?EHyQl(M}1OlQcCX>lXB*ODN003Z&P17_@)3Pi=i0wb04<W?v-u}7K

  zXmmQA+wDgE!qR9o8jr`%=ab_&uh(l?R=r;Tjiqon91I2-hIu?57~@*4h7h9uORK#=

  gQItJW-{SoTm)8|5##k|m00000NkvXXu0mjf3JwksH2?qr

  $ hg diff --git -r 0 -r 2

  $ hg diff --config diff.nobinary=True --git -r 0 -r 1

  diff --git a/binfile.bin b/binfile.bin

  Binary file binfile.bin has changed

  $ hg diff --git -r 2 -r 3

  diff --git a/binfile.bin b/nonbinfile

  copy from binfile.bin

  copy to nonbinfile

  index 37ba3d1c6f17137d9c5f5776fa040caf5fe73ff9..8e27be7d6154a1f68ea9160ef0e18691d20560dc

  GIT binary patch

  literal 5

  Mc$_OqttjCF00uV!&;S4c

  $ cd ..