annotate tests/test-import-git.t @ 25757:4d1382fd96ff

context: write dirstate out explicitly at the end of markcommitted

To detect change of a file without redundant comparison of file
content, dirstate recognizes a file as certainly clean, if:

  (1) it is already known as "normal",
  (2) dirstate entry for it has valid (= not "-1") timestamp, and
  (3) mode, size and timestamp of it on the filesystem are as same as
      ones expected in dirstate

This works as expected in many cases, but doesn't in the corner case
that changing a file keeps mode, size and timestamp of it on the
filesystem.

The timetable below shows steps in one of typical such situations:

  ---- ----------------------------------- ----------------
                                           timestamp of "f"
                                           ----------------
                                           dirstate   file-
  time          action                     mem  file  system
  ---- ----------------------------------- ---- ----- -----
   *                                             ***    ***
       - 'hg transplant REV1 REV2 ...'
         - transplanting REV1
           ....
   N
           - change "f", but keep size                   N
             (via 'patch.patch()')
           - 'dirstate.normal("f")'          N   ***
             (via 'repo.commit()')

         - transplanting REV2
           - change "f", but keep size                   N
             (via 'patch.patch()')
           - aborted while patching
  N+1
         - release wlock
           - 'dirstate.write()'              N    N      N

       - 'hg status' shows "r1" as "clean"   N    N      N
  ---- ----------------------------------- ---- ----- -----

The most important point is that 'dirstate.write()' is executed at N+1
or later. This causes writing dirstate timestamp N of "f" out
successfully. If it is executed at N, 'parsers.pack_dirstate()'
replaces timestamp N with "-1" before actual writing dirstate out.

This issue can occur when 'hg transplant' satisfies conditions below:

  - multiple revisions to be transplanted change the same file
  - those revisions don't change mode and size of the file, and
  - the 2nd or later revision of them fails after changing the file

The root cause of this issue is that files are changed without
flushing in-memory dirstate changes via 'repo.commit()' (even though
omitting 'dirstate.normallookup()' on files changed by 'patch.patch()'
for efficiency also causes this issue).

To detect changes of files correctly, this patch writes in-memory
dirstate changes out explicitly after marking files as clean in
'committablectx.markcommitted()', which is invoked via
'repo.commit()'.

After this change, timetable is changed as below:

  ---- ----------------------------------- ----------------
                                           timestamp of "f"
                                           ----------------
                                           dirstate   file-
  time          action                     mem  file  system
  ---- ----------------------------------- ---- ----- -----
   *                                             ***    ***
       - 'hg transplant REV1 REV2 ...'
         - transplanting REV1
           ....
   N
           - change "f", but keep size                   N
             (via 'patch.patch()')
           - 'dirstate.normal("f")'          N    ***
             (via 'repo.commit()')
       ----------------------------------- ---- ----- -----
           - 'dirsttate.write()'            -1    -1
       ----------------------------------- ---- ----- -----
         - transplanting REV2
           - change "f", but keep size                   N
             (via 'patch.patch()')
           - aborted while patching
  N+1
         - release wlock
           - 'dirstate.write()'              -1   -1     N

       - 'hg status' shows "r1" as "clean"   -1   -1     N
  ---- ----------------------------------- ---- ----- -----

To reproduce this issue in tests certainly, this patch emulates some
timing critical actions as below:

  - change "f" at N

    'patch.patch()' with 'fakepatchtime.py' explicitly changes mtime
    of patched files to "2000-01-01 00:00" (= N).

  - 'dirstate.write()' via 'repo.commit()' at N

    'fakedirstatewritetime.py' forces 'pack_dirstate()' to use
    "2000-01-01 00:00" as "now", only if 'pack_dirstate()' is invoked
    via 'committablectx.markcommitted()'.

  - 'dirstate.write()' via releasing wlock at N+1 (or "not at N")

    'pack_dirstate()' via releasing wlock uses actual timestamp at
    runtime as "now", and it should be different from the "2000-01-01
    00:00" of "f".

BTW, this patch doesn't test cases below, even though 'patch.patch()'
is used similarly in these cases:

  1. failure of 'hg import' or 'hg qpush'

  2. success of 'hg import', 'hg qpush' or 'hg transplant'

Case (1) above doesn't cause this kind of issue, because:

  - if patching is aborted by conflicts, changed files are committed

    changed files are marked as CLEAN, even though they are partially
    patched.

  - otherwise, dirstate are fully restored by 'dirstateguard'

    For example in timetable above, timestamp of "f" in .hg/dirstate
    is restored to -1 (or less than N), and subsequent 'hg status' can
    detect changes correctly.

Case (2) always causes 'repo.status()' invocation via 'repo.commit()'
just after changing files inside same wlock scope.

  ---- ----------------------------------- ----------------
                                           timestamp of "f"
                                           ----------------
                                           dirstate   file-
  time          action                     mem  file  system
  ---- ----------------------------------- ---- ----- -----
  N                                              ***   ***
       - make file "f" clean                            N

       - execute 'hg foobar'
         ....
         - 'dirstate.normal("f")'           N    ***
           (e.g. via dirty check
            or previous 'repo.commit()')

         - change "f", but keep size                    N
         - 'repo.status()' (*1)
           (via 'repo.commit()')
  ---- ----------------------------------- ---- ----- -----

At a glance, 'repo.status()' at (*1) seems to cause similar issue (=
"changed files are treated as clean"), but actually doesn't.

'dirstate._lastnormaltime' should be N at (*1) above, because
'dirstate.normal()' via dirty check is finished at N.

Therefore, "f" changed at N (= 'dirstate._lastnormaltime') is forcibly
treated as "unsure" at (*1), and changes are detected as expected (see
'dirstate.status()' for detail).

If 'hg import' is executed with '--no-commit', 'repo.status()' isn't
invoked just after changing files inside same wlock scope.

But preceding 'dirstate.normal()' is invoked inside another wlock
scope via 'cmdutil.bailifchanged()', and in-memory changes should be
flushed at the end of that scope.

Therefore, timestamp N of clean "f" should be replaced by -1, if
'dirstate.write()' is invoked at N. It means that condition of this
issue isn't satisfied.

  $ hg init repo
  $ cd repo

New file:

  $ hg import -d "1000000 0" -mnew - <<EOF
  > diff --git a/new b/new
  > new file mode 100644
  > index 0000000..7898192
  > --- /dev/null
  > +++ b/new
  > @@ -0,0 +1 @@
  > +a
  > EOF
  applying patch from stdin

  $ hg tip -q
  0:ae3ee40d2079

New empty file:

  $ hg import -d "1000000 0" -mempty - <<EOF
  > diff --git a/empty b/empty
  > new file mode 100644
  > EOF
  applying patch from stdin

  $ hg tip -q
  1:ab199dc869b5

  $ hg locate empty
  empty

chmod +x:

  $ hg import -d "1000000 0" -msetx - <<EOF
  > diff --git a/new b/new
  > old mode 100644
  > new mode 100755
  > EOF
  applying patch from stdin

#if execbit
  $ hg tip -q
  2:3a34410f282e
  $ test -x new
  $ hg rollback -q
#else
  $ hg tip -q
  1:ab199dc869b5
#endif

Copy and removing x bit:

  $ hg import -f -d "1000000 0" -mcopy - <<EOF
  > diff --git a/new b/copy
  > old mode 100755
  > new mode 100644
  > similarity index 100%
  > copy from new
  > copy to copy
  > diff --git a/new b/copyx
  > similarity index 100%
  > copy from new
  > copy to copyx
  > EOF
  applying patch from stdin

  $ test -f copy
#if execbit
  $ test ! -x copy
  $ test -x copyx
  $ hg tip -q
  2:21dfaae65c71
#else
  $ hg tip -q
  2:0efdaa8e3bf3
#endif

  $ hg up -qCr1
  $ hg rollback -q

Copy (like above but independent of execbit):

  $ hg import -d "1000000 0" -mcopy - <<EOF
  > diff --git a/new b/copy
  > similarity index 100%
  > copy from new
  > copy to copy
  > diff --git a/new b/copyx
  > similarity index 100%
  > copy from new
  > copy to copyx
  > EOF
  applying patch from stdin

  $ hg tip -q
  2:0efdaa8e3bf3
  $ test -f copy

  $ cat copy
  a

  $ hg cat copy
  a

Rename:

  $ hg import -d "1000000 0" -mrename - <<EOF
  > diff --git a/copy b/rename
  > similarity index 100%
  > rename from copy
  > rename to rename
  > EOF
  applying patch from stdin

  $ hg tip -q
  3:b1f57753fad2

  $ hg locate
  copyx
  empty
  new
  rename

Delete:

  $ hg import -d "1000000 0" -mdelete - <<EOF
  > diff --git a/copyx b/copyx
  > deleted file mode 100755
  > index 7898192..0000000
  > --- a/copyx
  > +++ /dev/null
  > @@ -1 +0,0 @@
  > -a
  > EOF
  applying patch from stdin

  $ hg tip -q
  4:1bd1da94b9b2

  $ hg locate
  empty
  new
  rename

  $ test -f copyx
  [1]

Regular diff:

  $ hg import -d "1000000 0" -mregular - <<EOF
  > diff --git a/rename b/rename
  > index 7898192..72e1fe3 100644
  > --- a/rename
  > +++ b/rename
  > @@ -1 +1,5 @@
  >  a
  > +a
  > +a
  > +a
  > +a
  > EOF
  applying patch from stdin

  $ hg tip -q
  5:46fe99cb3035

Copy and modify:

  $ hg import -d "1000000 0" -mcopymod - <<EOF
  > diff --git a/rename b/copy2
  > similarity index 80%
  > copy from rename
  > copy to copy2
  > index 72e1fe3..b53c148 100644
  > --- a/rename
  > +++ b/copy2
  > @@ -1,5 +1,5 @@
  >  a
  >  a
  > -a
  > +b
  >  a
  >  a
  > EOF
  applying patch from stdin

  $ hg tip -q
  6:ffeb3197c12d

  $ hg cat copy2
  a
  a
  b
  a
  a

Rename and modify:

  $ hg import -d "1000000 0" -mrenamemod - <<EOF
  > diff --git a/copy2 b/rename2
  > similarity index 80%
  > rename from copy2
  > rename to rename2
  > index b53c148..8f81e29 100644
  > --- a/copy2
  > +++ b/rename2
  > @@ -1,5 +1,5 @@
  >  a
  >  a
  >  b
  > -a
  > +c
  >  a
  > EOF
  applying patch from stdin

  $ hg tip -q
  7:401aede9e6bb

  $ hg locate copy2
  [1]
  $ hg cat rename2
  a
  a
  b
  c
  a

One file renamed multiple times:

  $ hg import -d "1000000 0" -mmultirenames - <<EOF
  > diff --git a/rename2 b/rename3
  > rename from rename2
  > rename to rename3
  > diff --git a/rename2 b/rename3-2
  > rename from rename2
  > rename to rename3-2
  > EOF
  applying patch from stdin

  $ hg tip -q
  8:2ef727e684e8

  $ hg log -vr. --template '{rev} {files} / {file_copies}\n'
  8 rename2 rename3 rename3-2 / rename3 (rename2)rename3-2 (rename2)

  $ hg locate rename2 rename3 rename3-2
  rename3
  rename3-2

  $ hg cat rename3
  a
  a
  b
  c
  a

  $ hg cat rename3-2
  a
  a
  b
  c
  a

  $ echo foo > foo
  $ hg add foo
  $ hg ci -m 'add foo'

Binary files and regular patch hunks:

  $ hg import -d "1000000 0" -m binaryregular - <<EOF
  > diff --git a/binary b/binary
  > new file mode 100644
  > index 0000000000000000000000000000000000000000..593f4708db84ac8fd0f5cc47c634f38c013fe9e4
  > GIT binary patch
  > literal 4
  > Lc\${NkU|;|M00aO5
  > 
  > diff --git a/foo b/foo2
  > rename from foo
  > rename to foo2
  > EOF
  applying patch from stdin

  $ hg tip -q
  10:27377172366e

  $ cat foo2
  foo

  $ hg manifest --debug | grep binary
  045c85ba38952325e126c70962cc0f9d9077bc67 644   binary

Multiple binary files:

  $ hg import -d "1000000 0" -m multibinary - <<EOF
  > diff --git a/mbinary1 b/mbinary1
  > new file mode 100644
  > index 0000000000000000000000000000000000000000..593f4708db84ac8fd0f5cc47c634f38c013fe9e4
  > GIT binary patch
  > literal 4
  > Lc\${NkU|;|M00aO5
  > 
  > diff --git a/mbinary2 b/mbinary2
  > new file mode 100644
  > index 0000000000000000000000000000000000000000..112363ac1917b417ffbd7f376ca786a1e5fa7490
  > GIT binary patch
  > literal 5
  > Mc\${NkU|\`?^000jF3jhEB
  > 
  > EOF
  applying patch from stdin

  $ hg tip -q
  11:18b73a84b4ab

  $ hg manifest --debug | grep mbinary
  045c85ba38952325e126c70962cc0f9d9077bc67 644   mbinary1
  a874b471193996e7cb034bb301cac7bdaf3e3f46 644   mbinary2

Binary file and delta hunk (we build the patch using this sed hack to
avoid an unquoted ^, which check-code says breaks sh on Solaris):

  $ sed 's/ caret /^/g;s/ dollarparen /$(/g' > quote-hack.patch <<'EOF'
  > diff --git a/delta b/delta
  > new file mode 100644
  > index 0000000000000000000000000000000000000000..8c9b7831b231c2600843e303e66b521353a200b3
  > GIT binary patch
  > literal 3749
  > zcmV;W4qEYvP)<h;3K|Lk000e1NJLTq006iE002D*0ssI2kt{U(0000PbVXQnQ*UN;
  > zcVTj606}DLVr3vnZDD6+Qe|Oed2z{QJOBU=M@d9MRCwC#oC!>o#}>x{(W-y~UN*tK
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  > zjxH`PPEJmgD7U?IK&h;(EGQ@_DJc<@01=4fiNXHcKZ8LhZQ8T}E3U4tUS3}OrcgQW
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  > zGiS21vn>WCCr+GLx caret !uNetzB6u3o(w6&1C2?_LW8ij$+$sZ*zZ`|US3H@8N~%&V%Z
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  > z*s){8pw68;i+kiG%CpBKYSJLLFyq&*U8}qDp+kpe&6<Vp(Z58%l#~>ZK?&s7y?b}i
  > zuwcOgO%x-27A;y785zknl_{sU;E6v$8{pWmVS{KaJPpu`i;HP$#flY@u~Ua~K3%tN
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  > zpxmunH#%=+ICMvZA~wyNH%~eMl!-g caret R!cYJ#WmLq5N8viz#J%%LPtkO?V)tZ81cp>
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  > zHr6)1ynEF<i3kO6A8&ppPMo-F=PnWfXkSj@i*7J6C<F}wR?s(O0niC?t+6;+k}pPq
  > zrok&TPU40rL0ZYDwenNrrmPZ`gjo@DEF`7 caret cKP||pUr;+r)hyn9O37=xA`3%Bj-ih
  > z+1usk<%5G-y+R?tA`qY=)6&vNjL{P?QzHg%P%>`ZxP=QB%DHY6L26?36V_p caret {}n$q
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  > zSohlc=7K+spN<ctf}5KgKqNyJDNP9;LZd)nTE=9|6Xdr9%Hzk63-tL2c9FD*rsyYY
  > z!}t+Yljq7-p$X;4_YL?6d;mdY3R##o1e%rlPxrsMh8|;sKTr~ caret QD#sw3&vS$FwlTk
  > zp1#Gw!Qo-$LtvpXt#ApV0g) caret F=qFB`VB!W297x=$mr<$>rco3v$QKih_xN!k6;M=@
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  > zk+ caret N&zCAiRns(?p6iBlk9v&h{1ve(FNtc)td51M>)TkXhc6{>5C)`fS$&)A1*CP1%
  > zld+peue4aYbg3C0!+4mu+}vE caret j_feX+ZijvffBI7Ofh#RZ*U3<3J5(+nfRCzexqQ5
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  > zwrmcd5MnP}xByB_)P@{J>DR9x6;`cUwPM8z){yooNiXPOc9_{W-gtwxE5TUg0vJk6
  > zO#JGruV&1cL6VGK2?+_YQr4`+EY8;Sm$9U$uuGRN=uj3k7?O9b+R~J7t_y*K64ZnI
  > zM+{aE<b(v?vSmw;9zFP!aE266zHIhlmdI@ caret xa6o2jwdRk54a$>pcRbC29ZyG!Cfdp
  > zutFf`Q`vljgo!(wHf=)F#m2_MIuj;L(2ja2YsQRX+rswV{d<H`Ar;(@%aNa9VPU8Z
  > z;tq*`y}dm#NDJHKlV}uTIm!_vAq5E7!X-p{P=Z=Sh668>PuVS1*6e}OwOiMc;u3OQ
  > z@Bs)w3=lzfKoufH$SFuPG@uZ4NOnM#+=8LnQ2Q4zUd+nM+OT26;lqbN{P07dhH{jH
  > zManE8 caret dLms-Q2;1kB<*Q1a3f8kZr;xX=!Qro@`~@xN*Qj>gx;i;0Z24!~i2uLb`}v
  > zA?R$|wvC+m caret Ups=*(4lDh*=UN8{5h(A?p#D caret 2N$8u4Z55!q?ZAh(iEEng9_Zi>IgO
  > z#~**JC8hE4@n{hO&8btT5F*?nC_%LhA3i)PDhh-pB_&1wGrDIl caret *=8x3n&;akBf caret -
  > zJd&86kq$%%907v caret tgWoQdwI`|oNK%VvU~S#C<o caret F?6c48?Cjj#-4P<>HFD%&|Ni~t
  > zKJ(|#H`$<5W+6ZkBb213rXonKZLB+X> caret L}J@W6osP3piLD_5?R!`S}*{xLBzFiL4@
  > zX+}l{`A%?f@T5tT%ztu60p;)be`fWC`tP@WpO=?cpf8Xuf1OSj6d3f@Ki(ovDYq%0
  > z{4ZSe`kOay5@=lAT!}vFzxyemC{sXDrhuYM0Y#ZI1r%ipD9W11{w=@&xgJ}t2x;ep
  > P00000NkvXXu0mjfZ5|Er
  > 
  > literal 0
  > HcmV?d00001
  > 
  > EOF
  $ hg import -d "1000000 0" -m delta quote-hack.patch
  applying quote-hack.patch
  $ rm quote-hack.patch

  $ hg manifest --debug | grep delta
  9600f98bb60ce732634d126aaa4ac1ec959c573e 644   delta

  $ hg import -d "1000000 0" -m delta - <<'EOF'
  > diff --git a/delta b/delta
  > index 8c9b7831b231c2600843e303e66b521353a200b3..0021dd95bc0dba53c39ce81377126d43731d68df 100644
  > GIT binary patch
  > delta 49
  > zcmZ1~yHs|=21Z8J$r~9bFdA-lVv=EEw4WT$qRf2QSa5SIOAHI6(&k4T8H|kLo4vWB
  > FSO9ZT4bA`n
  > 
  > delta 49
  > zcmV-10M7rV9i<(xumJ(}ld%Di0Xefm0vrMXpOaq%BLm9I%d>?9Tm%6Vv*HM70RcC&
  > HOA1;9yU-AD
  > 
  > EOF
  applying patch from stdin

  $ hg manifest --debug | grep delta
  56094bbea136dcf8dbd4088f6af469bde1a98b75 644   delta

Filenames with spaces:

  $ sed 's,EOL$,,g' <<EOF | hg import -d "1000000 0" -m spaces -
  > diff --git a/foo bar b/foo bar
  > new file mode 100644
  > index 0000000..257cc56
  > --- /dev/null
  > +++ b/foo bar	EOL
  > @@ -0,0 +1 @@
  > +foo
  > EOF
  applying patch from stdin

  $ hg tip -q
  14:4b79479c9a6d

  $ cat "foo bar"
  foo

Copy then modify the original file:

  $ hg import -d "1000000 0" -m copy-mod-orig - <<EOF
  > diff --git a/foo2 b/foo2
  > index 257cc56..fe08ec6 100644
  > --- a/foo2
  > +++ b/foo2
  > @@ -1 +1,2 @@
  >  foo
  > +new line
  > diff --git a/foo2 b/foo3
  > similarity index 100%
  > copy from foo2
  > copy to foo3
  > EOF
  applying patch from stdin

  $ hg tip -q
  15:9cbe44af4ae9

  $ cat foo3
  foo

Move text file and patch as binary

  $ echo a > text2
  $ hg ci -Am0
  adding text2
  $ hg import -d "1000000 0" -m rename-as-binary - <<"EOF"
  > diff --git a/text2 b/binary2
  > rename from text2
  > rename to binary2
  > index 78981922613b2afb6025042ff6bd878ac1994e85..10efcb362e9f3b3420fcfbfc0e37f3dc16e29757
  > GIT binary patch
  > literal 5
  > Mc$`b*O5$Pw00T?_*Z=?k
  > 
  > EOF
  applying patch from stdin

  $ cat binary2
  a
  b
  \x00 (no-eol) (esc)

  $ hg st --copies --change .
  A binary2
    text2
  R text2

Invalid base85 content

  $ hg rollback
  repository tip rolled back to revision 16 (undo import)
  working directory now based on revision 16
  $ hg revert -aq
  $ hg import -d "1000000 0" -m invalid-binary - <<"EOF"
  > diff --git a/text2 b/binary2
  > rename from text2
  > rename to binary2
  > index 78981922613b2afb6025042ff6bd878ac1994e85..10efcb362e9f3b3420fcfbfc0e37f3dc16e29757
  > GIT binary patch
  > literal 5
  > Mc$`b*O.$Pw00T?_*Z=?k
  > 
  > EOF
  applying patch from stdin
  abort: could not decode "binary2" binary patch: bad base85 character at position 6
  [255]

  $ hg revert -aq
  $ hg import -d "1000000 0" -m rename-as-binary - <<"EOF"
  > diff --git a/text2 b/binary2
  > rename from text2
  > rename to binary2
  > index 78981922613b2afb6025042ff6bd878ac1994e85..10efcb362e9f3b3420fcfbfc0e37f3dc16e29757
  > GIT binary patch
  > literal 6
  > Mc$`b*O5$Pw00T?_*Z=?k
  > 
  > EOF
  applying patch from stdin
  abort: "binary2" length is 5 bytes, should be 6
  [255]

  $ hg revert -aq
  $ hg import -d "1000000 0" -m rename-as-binary - <<"EOF"
  > diff --git a/text2 b/binary2
  > rename from text2
  > rename to binary2
  > index 78981922613b2afb6025042ff6bd878ac1994e85..10efcb362e9f3b3420fcfbfc0e37f3dc16e29757
  > GIT binary patch
  > Mc$`b*O5$Pw00T?_*Z=?k
  > 
  > EOF
  applying patch from stdin
  abort: could not extract "binary2" binary data
  [255]

Simulate a copy/paste turning LF into CRLF (issue2870)

  $ hg revert -aq
  $ cat > binary.diff <<"EOF"
  > diff --git a/text2 b/binary2
  > rename from text2
  > rename to binary2
  > index 78981922613b2afb6025042ff6bd878ac1994e85..10efcb362e9f3b3420fcfbfc0e37f3dc16e29757
  > GIT binary patch
  > literal 5
  > Mc$`b*O5$Pw00T?_*Z=?k
  > 
  > EOF
  >>> fp = file('binary.diff', 'rb')
  >>> data = fp.read()
  >>> fp.close()
  >>> file('binary.diff', 'wb').write(data.replace('\n', '\r\n'))
  $ rm binary2
  $ hg import --no-commit binary.diff
  applying binary.diff

  $ cd ..

Consecutive import with renames (issue2459)

  $ hg init issue2459
  $ cd issue2459
  $ hg import --no-commit --force - <<EOF
  > diff --git a/a b/a
  > new file mode 100644
  > EOF
  applying patch from stdin
  $ hg import --no-commit --force - <<EOF
  > diff --git a/a b/b
  > rename from a
  > rename to b
  > EOF
  applying patch from stdin
  a has not been committed yet, so no copy data will be stored for b.
  $ hg debugstate
  a   0         -1 unset               b
  $ hg ci -m done
  $ cd ..

Renames and strip

  $ hg init renameandstrip
  $ cd renameandstrip
  $ echo a > a
  $ hg ci -Am adda
  adding a
  $ hg import --no-commit -p2 - <<EOF
  > diff --git a/foo/a b/foo/b
  > rename from foo/a
  > rename to foo/b
  > EOF
  applying patch from stdin
  $ hg st --copies
  A b
    a
  R a

Prefix with strip, renames, creates etc

  $ hg revert -aC
  undeleting a
  forgetting b
  $ rm b
  $ mkdir -p dir/dir2
  $ echo b > dir/dir2/b
  $ echo c > dir/dir2/c
  $ echo d > dir/d
  $ hg ci -Am addbcd
  adding dir/d
  adding dir/dir2/b
  adding dir/dir2/c

prefix '.' is the same as no prefix
  $ hg import --no-commit --prefix . - <<EOF
  > diff --git a/dir/a b/dir/a
  > --- /dev/null
  > +++ b/dir/a
  > @@ -0,0 +1 @@
  > +aaaa
  > diff --git a/dir/d b/dir/d
  > --- a/dir/d
  > +++ b/dir/d
  > @@ -1,1 +1,2 @@
  >  d
  > +dddd
  > EOF
  applying patch from stdin
  $ cat dir/a
  aaaa
  $ cat dir/d
  d
  dddd
  $ hg revert -aC
  forgetting dir/a (glob)
  reverting dir/d (glob)
  $ rm dir/a

prefix with default strip
  $ hg import --no-commit --prefix dir/ - <<EOF
  > diff --git a/a b/a
  > --- /dev/null
  > +++ b/a
  > @@ -0,0 +1 @@
  > +aaa
  > diff --git a/d b/d
  > --- a/d
  > +++ b/d
  > @@ -1,1 +1,2 @@
  >  d
  > +dd
  > EOF
  applying patch from stdin
  $ cat dir/a
  aaa
  $ cat dir/d
  d
  dd
  $ hg revert -aC
  forgetting dir/a (glob)
  reverting dir/d (glob)
  $ rm dir/a
(test that prefixes are relative to the cwd)
  $ mkdir tmpdir
  $ cd tmpdir
  $ hg import --no-commit -p2 --prefix ../dir/ - <<EOF
  > diff --git a/foo/a b/foo/a
  > new file mode 100644
  > --- /dev/null
  > +++ b/foo/a
  > @@ -0,0 +1 @@
  > +a
  > diff --git a/foo/dir2/b b/foo/dir2/b2
  > rename from foo/dir2/b
  > rename to foo/dir2/b2
  > diff --git a/foo/dir2/c b/foo/dir2/c
  > --- a/foo/dir2/c
  > +++ b/foo/dir2/c
  > @@ -0,0 +1 @@
  > +cc
  > diff --git a/foo/d b/foo/d
  > deleted file mode 100644
  > --- a/foo/d
  > +++ /dev/null
  > @@ -1,1 +0,0 @@
  > -d
  > EOF
  applying patch from stdin
  $ hg st --copies
  M dir/dir2/c
  A dir/a
  A dir/dir2/b2
    dir/dir2/b
  R dir/d
  R dir/dir2/b
  $ cd ..

Renames, similarity and git diff

  $ hg revert -aC
  forgetting dir/a (glob)
  undeleting dir/d (glob)
  undeleting dir/dir2/b (glob)
  forgetting dir/dir2/b2 (glob)
  reverting dir/dir2/c (glob)
  $ rm dir/a dir/dir2/b2
  $ hg import --similarity 90 --no-commit - <<EOF
  > diff --git a/a b/b
  > rename from a
  > rename to b
  > EOF
  applying patch from stdin
  $ hg st --copies
  A b
    a
  R a
  $ cd ..

Pure copy with existing destination

  $ hg init copytoexisting
  $ cd copytoexisting
  $ echo a > a
  $ echo b > b
  $ hg ci -Am add
  adding a
  adding b
  $ hg import --no-commit - <<EOF
  > diff --git a/a b/b
  > copy from a
  > copy to b
  > EOF
  applying patch from stdin
  abort: cannot create b: destination already exists
  [255]
  $ cat b
  b

Copy and changes with existing destination

  $ hg import --no-commit - <<EOF
  > diff --git a/a b/b
  > copy from a
  > copy to b
  > --- a/a
  > +++ b/b
  > @@ -1,1 +1,2 @@
  > a
  > +b
  > EOF
  applying patch from stdin
  cannot create b: destination already exists
  1 out of 1 hunks FAILED -- saving rejects to file b.rej
  abort: patch failed to apply
  [255]
  $ cat b
  b

#if symlink

  $ ln -s b linkb
  $ hg add linkb
  $ hg ci -m addlinkb
  $ hg import --no-commit - <<EOF
  > diff --git a/linkb b/linkb
  > deleted file mode 120000
  > --- a/linkb
  > +++ /dev/null
  > @@ -1,1 +0,0 @@
  > -badhunk
  > \ No newline at end of file
  > EOF
  applying patch from stdin
  patching file linkb
  Hunk #1 FAILED at 0
  1 out of 1 hunks FAILED -- saving rejects to file linkb.rej
  abort: patch failed to apply
  [255]
  $ hg st
  ? b.rej
  ? linkb.rej

#endif

Test corner case involving copies and multiple hunks (issue3384)

  $ hg revert -qa
  $ hg import --no-commit - <<EOF
  > diff --git a/a b/c
  > copy from a
  > copy to c
  > --- a/a
  > +++ b/c
  > @@ -1,1 +1,2 @@
  >  a
  > +a
  > @@ -2,1 +2,2 @@
  >  a
  > +a
  > diff --git a/a b/a
  > --- a/a
  > +++ b/a
  > @@ -1,1 +1,2 @@
  >  a
  > +b
  > EOF
  applying patch from stdin

  $ cd ..