Merge branch 'esr/maint-doc-fast-import'
[git.git] / git-merge-one-file.sh
blobf612cb847aca981e16cb6006fa08d870497c6263
1 #!/bin/sh
3 # Copyright (c) Linus Torvalds, 2005
5 # This is the git per-file merge script, called with
7 # $1 - original file SHA1 (or empty)
8 # $2 - file in branch1 SHA1 (or empty)
9 # $3 - file in branch2 SHA1 (or empty)
10 # $4 - pathname in repository
11 # $5 - original file mode (or empty)
12 # $6 - file in branch1 mode (or empty)
13 # $7 - file in branch2 mode (or empty)
15 # Handle some trivial cases.. The _really_ trivial cases have
16 # been handled already by git read-tree, but that one doesn't
17 # do any merges that might change the tree layout.
19 USAGE='<orig blob> <our blob> <their blob> <path>'
20 USAGE="$USAGE <orig mode> <our mode> <their mode>"
21 LONG_USAGE="Usage: git merge-one-file $USAGE
23 Blob ids and modes should be empty for missing files."
25 SUBDIRECTORY_OK=Yes
26 . git-sh-setup
27 cd_to_toplevel
28 require_work_tree
30 if ! test "$#" -eq 7
31 then
32 echo "$LONG_USAGE"
33 exit 1
36 case "${1:-.}${2:-.}${3:-.}" in
38 # Deleted in both or deleted in one and unchanged in the other
40 "$1.." | "$1.$1" | "$1$1.")
41 if [ "$2" ]; then
42 echo "Removing $4"
43 else
44 # read-tree checked that index matches HEAD already,
45 # so we know we do not have this path tracked.
46 # there may be an unrelated working tree file here,
47 # which we should just leave unmolested. Make sure
48 # we do not have it in the index, though.
49 exec git update-index --remove -- "$4"
51 if test -f "$4"; then
52 rm -f -- "$4" &&
53 rmdir -p "$(expr "z$4" : 'z\(.*\)/')" 2>/dev/null || :
54 fi &&
55 exec git update-index --remove -- "$4"
59 # Added in one.
61 ".$2.")
62 # the other side did not add and we added so there is nothing
63 # to be done, except making the path merged.
64 exec git update-index --add --cacheinfo "$6" "$2" "$4"
66 "..$3")
67 echo "Adding $4"
68 if test -f "$4"
69 then
70 echo "ERROR: untracked $4 is overwritten by the merge."
71 exit 1
73 git update-index --add --cacheinfo "$7" "$3" "$4" &&
74 exec git checkout-index -u -f -- "$4"
78 # Added in both, identically (check for same permissions).
80 ".$3$2")
81 if [ "$6" != "$7" ]; then
82 echo "ERROR: File $4 added identically in both branches,"
83 echo "ERROR: but permissions conflict $6->$7."
84 exit 1
86 echo "Adding $4"
87 git update-index --add --cacheinfo "$6" "$2" "$4" &&
88 exec git checkout-index -u -f -- "$4"
92 # Modified in both, but differently.
94 "$1$2$3" | ".$2$3")
96 case ",$6,$7," in
97 *,120000,*)
98 echo "ERROR: $4: Not merging symbolic link changes."
99 exit 1
101 *,160000,*)
102 echo "ERROR: $4: Not merging conflicting submodule changes."
103 exit 1
105 esac
107 src2=`git-unpack-file $3`
108 case "$1" in
110 echo "Added $4 in both, but differently."
111 # This extracts OUR file in $orig, and uses git apply to
112 # remove lines that are unique to ours.
113 orig=`git-unpack-file $2`
114 sz0=`wc -c <"$orig"`
115 @@DIFF@@ -u -La/$orig -Lb/$orig $orig $src2 | git apply --no-add
116 sz1=`wc -c <"$orig"`
118 # If we do not have enough common material, it is not
119 # worth trying two-file merge using common subsections.
120 expr $sz0 \< $sz1 \* 2 >/dev/null || : >$orig
123 echo "Auto-merging $4"
124 orig=`git-unpack-file $1`
126 esac
128 # Be careful for funny filename such as "-L" in "$4", which
129 # would confuse "merge" greatly.
130 src1=`git-unpack-file $2`
131 git merge-file "$src1" "$orig" "$src2"
132 ret=$?
133 msg=
134 if [ $ret -ne 0 ]; then
135 msg='content conflict'
138 # Create the working tree file, using "our tree" version from the
139 # index, and then store the result of the merge.
140 git checkout-index -f --stage=2 -- "$4" && cat "$src1" >"$4" || exit 1
141 rm -f -- "$orig" "$src1" "$src2"
143 if [ "$6" != "$7" ]; then
144 if [ -n "$msg" ]; then
145 msg="$msg, "
147 msg="${msg}permissions conflict: $5->$6,$7"
148 ret=1
150 if [ "$1" = '' ]; then
151 ret=1
154 if [ $ret -ne 0 ]; then
155 echo "ERROR: $msg in $4"
156 exit 1
158 exec git update-index -- "$4"
162 echo "ERROR: $4: Not handling case $1 -> $2 -> $3"
164 esac
165 exit 1