diff tests/test-diff-upgrade.out @ 10189:e451e599fbcf

patch: support diff data loss detection and upgrade

In worst case, generating diff in upgrade mode can be two times more expensive
than generating it in git mode directly: we may have to regenerate the whole
diff again whenever a git feature is detected. Also, the first diff attempt is
completely buffered instead of being streamed. That said, even without having
profiled it yet, I am convinced we can fast-path the upgrade mode if necessary
were it to be used in regular diff commands, and not only in mq where avoiding
data loss is worth the price.

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/tests/test-diff-upgrade.out	Fri Jan 01 20:54:05 2010 +0100
@@ -0,0 +1,186 @@
+% make a combination of new, changed and deleted file
+adding binary
+adding exec
+adding regular
+adding rmbinary
+adding rmempty
+adding rmexec
+adding rmregular
+adding setexec
+adding unsetexec
+adding newbinary
+adding newempty
+adding newexec
+adding newregular
+removing rmbinary
+removing rmempty
+removing rmexec
+removing rmregular
+% git=no: regular diff for all files
+diff -r b3f053cd7c7f binary
+Binary file binary has changed
+diff -r b3f053cd7c7f exec
+--- a/exec
++++ b/exec
+@@ -1,1 +1,2 @@
+ exec
++exec
+diff -r b3f053cd7c7f newbinary
+Binary file newbinary has changed
+diff -r b3f053cd7c7f newexec
+--- /dev/null
++++ b/newexec
+@@ -0,0 +1,1 @@
++newexec
+diff -r b3f053cd7c7f newregular
+--- /dev/null
++++ b/newregular
+@@ -0,0 +1,1 @@
++newregular
+diff -r b3f053cd7c7f regular
+--- a/regular
++++ b/regular
+@@ -1,1 +1,2 @@
+ regular
++regular
+diff -r b3f053cd7c7f rmbinary
+Binary file rmbinary has changed
+diff -r b3f053cd7c7f rmexec
+--- a/rmexec
++++ /dev/null
+@@ -1,1 +0,0 @@
+-rmexec
+diff -r b3f053cd7c7f rmregular
+--- a/rmregular
++++ /dev/null
+@@ -1,1 +0,0 @@
+-rmregular
+% git=no: git diff for single regular file
+diff --git a/regular b/regular
+--- a/regular
++++ b/regular
+@@ -1,1 +1,2 @@
+ regular
++regular
+% git=auto: regular diff for regular files and removals
+diff -r b3f053cd7c7f newregular
+--- /dev/null
++++ b/newregular
+@@ -0,0 +1,1 @@
++newregular
+diff -r b3f053cd7c7f regular
+--- a/regular
++++ b/regular
+@@ -1,1 +1,2 @@
+ regular
++regular
+diff -r b3f053cd7c7f rmbinary
+Binary file rmbinary has changed
+diff -r b3f053cd7c7f rmexec
+--- a/rmexec
++++ /dev/null
+@@ -1,1 +0,0 @@
+-rmexec
+diff -r b3f053cd7c7f rmregular
+--- a/rmregular
++++ /dev/null
+@@ -1,1 +0,0 @@
+-rmregular
+% git=auto: git diff for exec
+diff -r b3f053cd7c7f exec
+--- a/exec
++++ b/exec
+@@ -1,1 +1,2 @@
+ exec
++exec
+% git=auto: git diff for newexec
+diff --git a/newexec b/newexec
+new file mode 100755
+--- /dev/null
++++ b/newexec
+@@ -0,0 +1,1 @@
++newexec
+% git=auto: git diff for setexec
+diff --git a/setexec b/setexec
+old mode 100644
+new mode 100755
+% git=auto: git diff for unsetexec
+diff --git a/unsetexec b/unsetexec
+old mode 100755
+new mode 100644
+% git=auto: git diff for binary
+diff --git a/binary b/binary
+index a9128c283485202893f5af379dd9beccb6e79486..09f370e38f498a462e1ca0faa724559b6630c04f
+GIT binary patch
+literal 2
+Jc${Nk0000200961
+
+% git=auto: git diff for newbinary
+diff --git a/newbinary b/newbinary
+new file mode 100644
+index 0000000000000000000000000000000000000000..f76dd238ade08917e6712764a16a22005a50573d
+GIT binary patch
+literal 1
+Ic${MZ000310RR91
+
+% git=auto: git diff for newempty
+diff --git a/newempty b/newempty
+new file mode 100644
+% git=auto: git diff for rmempty
+diff --git a/rmempty b/rmempty
+deleted file mode 100644
+% git=warn: regular diff with data loss warnings
+diff -r b3f053cd7c7f binary
+Binary file binary has changed
+diff -r b3f053cd7c7f exec
+--- a/exec
++++ b/exec
+@@ -1,1 +1,2 @@
+ exec
++exec
+diff -r b3f053cd7c7f newbinary
+Binary file newbinary has changed
+diff -r b3f053cd7c7f newexec
+--- /dev/null
++++ b/newexec
+@@ -0,0 +1,1 @@
++newexec
+diff -r b3f053cd7c7f newregular
+--- /dev/null
++++ b/newregular
+@@ -0,0 +1,1 @@
++newregular
+diff -r b3f053cd7c7f regular
+--- a/regular
++++ b/regular
+@@ -1,1 +1,2 @@
+ regular
++regular
+diff -r b3f053cd7c7f rmbinary
+Binary file rmbinary has changed
+diff -r b3f053cd7c7f rmexec
+--- a/rmexec
++++ /dev/null
+@@ -1,1 +0,0 @@
+-rmexec
+diff -r b3f053cd7c7f rmregular
+--- a/rmregular
++++ /dev/null
+@@ -1,1 +0,0 @@
+-rmregular
+data lost for: binary
+data lost for: newbinary
+data lost for: newempty
+data lost for: newexec
+data lost for: rmempty
+data lost for: setexec
+data lost for: unsetexec
+% git=abort: fail on execute bit change
+abort: losing data for setexec
+% git=abort: succeed on regular file
+diff -r b3f053cd7c7f regular
+--- a/regular
++++ b/regular
+@@ -1,1 +1,2 @@
+ regular
++regular