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427dcb4bca
This introduces the diff-core, the layer between the diff-tree family and the external diff interface engine. The calls to the interface diff-tree family uses (diff_change and diff_addremove) have not changed and will not change. The purpose of the diff-core layer is to provide an infrastructure to transform the set of differences sent from the applications, before sending them to the external diff interface. The recently introduced rename detection code has been rewritten to use the diff-core facility. When applications send in separate creates and deletes, matching ones are transformed into a single rename-and-edit diff, and sent out to the external diff interface as such. This patch also enhances the rename detection code further to be able to detect copies. Currently this happens only as long as copy sources appear as part of the modified files, but there already is enough provision for callers to report unmodified files to diff-core, so that they can be also used as copy source candidates. Extending the callers this way will be done in a separate patch. Please see and marvel at how well this works by trying out the newly added t/t4003-diff-rename-1.sh test script. Signed-off-by: Junio C Hamano <junkio@cox.net> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
145 lines
3.3 KiB
Bash
Executable File
145 lines
3.3 KiB
Bash
Executable File
#!/bin/sh
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# Copyright (C) 2005 Junio C Hamano
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#
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# Applying diff between two trees to the work tree can be
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# done with the following single command:
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#
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# GIT_EXTERNAL_DIFF=git-apply-patch-script git-diff-tree -p $tree1 $tree2
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#
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case "$#" in
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1)
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echo >&2 "cannot handle unmerged diff on path $1."
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exit 1 ;;
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8 | 9)
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echo >&2 "cannot handle rename diff between $1 and $8 yet."
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exit 1 ;;
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esac
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name="$1" tmp1="$2" hex1="$3" mode1="$4" tmp2="$5" hex2="$6" mode2="$7"
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type1=f
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case "$mode1" in
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*120???) type1=l ;;
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*1007??) mode1=+x ;;
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*1006??) mode1=-x ;;
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.) type1=- ;;
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esac
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type2=f
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case "$mode2" in
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*120???) type2=l ;;
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*1007??) mode2=+x ;;
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*1006??) mode2=-x ;;
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.) type2=- ;;
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esac
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case "$type1,$type2" in
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-,?)
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dir=$(dirname "$name")
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case "$dir" in '' | .) ;; *) mkdir -p "$dir" ;; esac || {
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echo >&2 "cannot create leading path for $name."
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exit 1
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}
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if test -e "$name"
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then
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echo >&2 "path $name to be created already exists."
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exit 1
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fi
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case "$type2" in
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f)
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# creating a regular file
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cat "$tmp2" >"$name" || {
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echo >&2 "cannot create a regular file $name."
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exit 1
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}
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case "$mode2" in
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+x)
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echo >&2 "created a regular file $name with mode +x."
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chmod "$mode2" "$name"
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;;
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-x)
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echo >&2 "created a regular file $name."
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;;
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esac
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;;
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l)
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# creating a symlink
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ln -s "$(cat "$tmp2")" "$name" || {
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echo >&2 "cannot create a symbolic link $name."
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exit 1
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}
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echo >&2 "created a symbolic link $name."
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;;
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*)
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echo >&2 "do not know how to create $name of type $type2."
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exit 1
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esac
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git-update-cache --add -- "$name" ;;
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?,-)
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rm -f "$name" || {
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echo >&2 "cannot remove $name"
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exit 1
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}
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echo >&2 "deleted $name."
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git-update-cache --remove -- "$name" ;;
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l,f|f,l)
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echo >&2 "cannot change a regular file $name and a symbolic link $name."
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exit 1 ;;
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l,l)
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# symlink to symlink
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current=$(readlink "$name") || {
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echo >&2 "cannot read the target of the symbolic link $name."
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exit 1
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}
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original=$(cat "$tmp1")
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next=$(cat "$tmp2")
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test "$original" != "$current" || {
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echo >&2 "cannot apply symbolic link target change ($original->$next) to $name which points to $current."
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exit 1
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}
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if test "$next" != "$current"
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then
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rm -f "$name" && ln -s "$next" "$name" || {
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echo >&2 "cannot create symbolic link $name."
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exit 1
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}
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echo >&2 "changed symbolic target of $name."
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git-update-cache -- "$name"
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fi ;;
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f,f)
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# changed
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test -e "$name" || {
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echo >&2 "regular file $name to be patched does not exist."
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exit 1
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}
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dir=$(dirname "$name")
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case "$dir" in '' | .) ;; *) mkdir -p "$dir";; esac || {
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echo >&2 "cannot create leading path for $name."
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exit 1
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}
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tmp=.git-apply-patch-$$
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trap "rm -f $tmp-*" 0 1 2 3 15
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# Be careful, in case "$tmp2" is borrowed path from the work tree
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# we are looking at...
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diff -u -L "a/$name" -L "b/$name" "$tmp1" "$tmp2" >$tmp-patch
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# This will say "patching ..." so we do not say anything outselves.
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patch -p1 <$tmp-patch || exit
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rm -f $tmp-patch
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case "$mode1,$mode2" in
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"$mode2,$mode1") ;;
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*)
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chmod "$mode2" "$name"
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echo >&2 "changed mode from $mode1 to $mode2."
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;;
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esac
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git-update-cache -- "$name"
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esac
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