Merge branch 'cb/do-not-use-test-cmp-with-a'
[git/git.git] / git-merge-one-file.sh
1 #!/bin/sh
2 #
3 # Copyright (c) Linus Torvalds, 2005
4 #
5 # This is the git per-file merge script, called with
6 #
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 # $7 - file in branch2 mode (or empty)
14 #
15 # Handle some trivial cases.. The _really_ trivial cases have
16 # been handled already by git read-tree, but that one doesn't
17 # do any merges that might change the tree layout.
18
19 USAGE='<orig blob> <our blob> <their blob> <path>'
20 USAGE="$USAGE <orig mode> <our mode> <their mode>"
21 LONG_USAGE="usage: git merge-one-file $USAGE
22
23 Blob ids and modes should be empty for missing files."
24
25 SUBDIRECTORY_OK=Yes
26 . git-sh-setup
27 cd_to_toplevel
28 require_work_tree
29
30 if test $# != 7
31 then
32 echo "$LONG_USAGE"
33 exit 1
34 fi
35
36 case "${1:-.}${2:-.}${3:-.}" in
37 #
38 # Deleted in both or deleted in one and unchanged in the other
39 #
40 "$1.." | "$1.$1" | "$1$1.")
41 if { test -z "$6" && test "$5" != "$7"; } ||
42 { test -z "$7" && test "$5" != "$6"; }
43 then
44 echo "ERROR: File $4 deleted on one branch but had its" >&2
45 echo "ERROR: permissions changed on the other." >&2
46 exit 1
47 fi
48
49 if test -n "$2"
50 then
51 echo "Removing $4"
52 else
53 # read-tree checked that index matches HEAD already,
54 # so we know we do not have this path tracked.
55 # there may be an unrelated working tree file here,
56 # which we should just leave unmolested. Make sure
57 # we do not have it in the index, though.
58 exec git update-index --remove -- "$4"
59 fi
60 if test -f "$4"
61 then
62 rm -f -- "$4" &&
63 rmdir -p "$(expr "z$4" : 'z\(.*\)/')" 2>/dev/null || :
64 fi &&
65 exec git update-index --remove -- "$4"
66 ;;
67
68 #
69 # Added in one.
70 #
71 ".$2.")
72 # the other side did not add and we added so there is nothing
73 # to be done, except making the path merged.
74 exec git update-index --add --cacheinfo "$6" "$2" "$4"
75 ;;
76 "..$3")
77 echo "Adding $4"
78 if test -f "$4"
79 then
80 echo "ERROR: untracked $4 is overwritten by the merge." >&2
81 exit 1
82 fi
83 git update-index --add --cacheinfo "$7" "$3" "$4" &&
84 exec git checkout-index -u -f -- "$4"
85 ;;
86
87 #
88 # Added in both, identically (check for same permissions).
89 #
90 ".$3$2")
91 if test "$6" != "$7"
92 then
93 echo "ERROR: File $4 added identically in both branches," >&2
94 echo "ERROR: but permissions conflict $6->$7." >&2
95 exit 1
96 fi
97 echo "Adding $4"
98 git update-index --add --cacheinfo "$6" "$2" "$4" &&
99 exec git checkout-index -u -f -- "$4"
100 ;;
101
102 #
103 # Modified in both, but differently.
104 #
105 "$1$2$3" | ".$2$3")
106
107 case ",$6,$7," in
108 *,120000,*)
109 echo "ERROR: $4: Not merging symbolic link changes." >&2
110 exit 1
111 ;;
112 *,160000,*)
113 echo "ERROR: $4: Not merging conflicting submodule changes." >&2
114 exit 1
115 ;;
116 esac
117
118 src1=$(git unpack-file $2)
119 src2=$(git unpack-file $3)
120 case "$1" in
121 '')
122 echo "Added $4 in both, but differently."
123 orig=$(git unpack-file $(git hash-object /dev/null))
124 ;;
125 *)
126 echo "Auto-merging $4"
127 orig=$(git unpack-file $1)
128 ;;
129 esac
130
131 git merge-file "$src1" "$orig" "$src2"
132 ret=$?
133 msg=
134 if test $ret != 0 || test -z "$1"
135 then
136 msg='content conflict'
137 ret=1
138 fi
139
140 # Create the working tree file, using "our tree" version from the
141 # index, and then store the result of the merge.
142 git checkout-index -f --stage=2 -- "$4" && cat "$src1" >"$4" || exit 1
143 rm -f -- "$orig" "$src1" "$src2"
144
145 if test "$6" != "$7"
146 then
147 if test -n "$msg"
148 then
149 msg="$msg, "
150 fi
151 msg="${msg}permissions conflict: $5->$6,$7"
152 ret=1
153 fi
154
155 if test $ret != 0
156 then
157 echo "ERROR: $msg in $4" >&2
158 exit 1
159 fi
160 exec git update-index -- "$4"
161 ;;
162
163 *)
164 echo "ERROR: $4: Not handling case $1 -> $2 -> $3" >&2
165 ;;
166 esac
167 exit 1