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e1ff064e TR |
1 | #!/bin/sh |
2 | ||
3 | USAGE="[-a] [-r] [-m] [-t] [-n] [-b <newname>] <name>" | |
4 | LONG_USAGE="git-resurrect attempts to find traces of a branch tip | |
5 | called <name>, and tries to resurrect it. Currently, the reflog is | |
6 | searched for checkout messages, and with -r also merge messages. With | |
7 | -m and -t, the history of all refs is scanned for Merge <name> into | |
8 | other/Merge <other> into <name> (respectively) commit subjects, which | |
9 | is rather slow but allows you to resurrect other people's topic | |
10 | branches." | |
11 | ||
50ab6558 | 12 | OPTIONS_KEEPDASHDASH= |
51ba8ce3 | 13 | OPTIONS_STUCKLONG= |
e1ff064e TR |
14 | OPTIONS_SPEC="\ |
15 | git resurrect $USAGE | |
16 | -- | |
17 | b,branch= save branch as <newname> instead of <name> | |
18 | a,all same as -l -r -m -t | |
19 | k,keep-going full rev-list scan (instead of first match) | |
20 | l,reflog scan reflog for checkouts (enabled by default) | |
21 | r,reflog-merges scan for merges recorded in reflog | |
22 | m,merges scan for merges into other branches (slow) | |
23 | t,merge-targets scan for merges of other branches into <name> | |
24 | n,dry-run don't recreate the branch" | |
25 | ||
26 | . git-sh-setup | |
27 | ||
28 | search_reflog () { | |
fba275dc | 29 | sed -ne 's~^\([^ ]*\) .* checkout: moving from '"$1"' .*~\1~p' \ |
d047154e | 30 | < "$GIT_DIR"/logs/HEAD |
e1ff064e TR |
31 | } |
32 | ||
33 | search_reflog_merges () { | |
34 | git rev-parse $( | |
fba275dc | 35 | sed -ne 's~^[^ ]* \([^ ]*\) .* merge '"$1"':.*~\1^2~p' \ |
e1ff064e TR |
36 | < "$GIT_DIR"/logs/HEAD |
37 | ) | |
38 | } | |
39 | ||
e37eae0c | 40 | oid_pattern=$(git hash-object --stdin </dev/null | sed -e 's/./[0-9a-f]/g') |
e1ff064e TR |
41 | |
42 | search_merges () { | |
d047154e DL |
43 | git rev-list --all --grep="Merge branch '$1'" \ |
44 | --pretty=tformat:"%P %s" | | |
e37eae0c | 45 | sed -ne "/^$oid_pattern \($oid_pattern\) Merge .*/ {s//\1/p;$early_exit}" |
e1ff064e TR |
46 | } |
47 | ||
48 | search_merge_targets () { | |
49 | git rev-list --all --grep="Merge branch '[^']*' into $branch\$" \ | |
50 | --pretty=tformat:"%H %s" --all | | |
e37eae0c | 51 | sed -ne "/^\($oid_pattern\) Merge .*/ {s//\1/p;$early_exit} " |
e1ff064e TR |
52 | } |
53 | ||
54 | dry_run= | |
55 | early_exit=q | |
56 | scan_reflog=t | |
57 | scan_reflog_merges= | |
58 | scan_merges= | |
59 | scan_merge_targets= | |
60 | new_name= | |
61 | ||
62 | while test "$#" != 0; do | |
63 | case "$1" in | |
64 | -b|--branch) | |
65 | shift | |
66 | new_name="$1" | |
67 | ;; | |
68 | -n|--dry-run) | |
69 | dry_run=t | |
70 | ;; | |
71 | --no-dry-run) | |
72 | dry_run= | |
73 | ;; | |
74 | -k|--keep-going) | |
75 | early_exit= | |
76 | ;; | |
77 | --no-keep-going) | |
78 | early_exit=q | |
79 | ;; | |
80 | -m|--merges) | |
81 | scan_merges=t | |
82 | ;; | |
83 | --no-merges) | |
84 | scan_merges= | |
85 | ;; | |
86 | -l|--reflog) | |
87 | scan_reflog=t | |
88 | ;; | |
89 | --no-reflog) | |
90 | scan_reflog= | |
91 | ;; | |
92 | -r|--reflog_merges) | |
93 | scan_reflog_merges=t | |
94 | ;; | |
95 | --no-reflog_merges) | |
96 | scan_reflog_merges= | |
97 | ;; | |
98 | -t|--merge-targets) | |
99 | scan_merge_targets=t | |
100 | ;; | |
101 | --no-merge-targets) | |
102 | scan_merge_targets= | |
103 | ;; | |
104 | -a|--all) | |
105 | scan_reflog=t | |
106 | scan_reflog_merges=t | |
107 | scan_merges=t | |
108 | scan_merge_targets=t | |
109 | ;; | |
110 | --) | |
111 | shift | |
112 | break | |
113 | ;; | |
114 | *) | |
115 | usage | |
116 | ;; | |
117 | esac | |
118 | shift | |
119 | done | |
120 | ||
121 | test "$#" = 1 || usage | |
122 | ||
123 | all_strategies="$scan_reflog$scan_reflog_merges$scan_merges$scan_merge_targets" | |
124 | if test -z "$all_strategies"; then | |
125 | die "must enable at least one of -lrmt" | |
126 | fi | |
127 | ||
128 | branch="$1" | |
129 | test -z "$new_name" && new_name="$branch" | |
130 | ||
131 | if test ! -z "$scan_reflog"; then | |
132 | if test -r "$GIT_DIR"/logs/HEAD; then | |
133 | candidates="$(search_reflog $branch)" | |
134 | else | |
135 | die 'reflog scanning requested, but' \ | |
136 | '$GIT_DIR/logs/HEAD not readable' | |
137 | fi | |
138 | fi | |
139 | if test ! -z "$scan_reflog_merges"; then | |
140 | if test -r "$GIT_DIR"/logs/HEAD; then | |
141 | candidates="$candidates $(search_reflog_merges $branch)" | |
142 | else | |
143 | die 'reflog scanning requested, but' \ | |
144 | '$GIT_DIR/logs/HEAD not readable' | |
145 | fi | |
146 | fi | |
147 | if test ! -z "$scan_merges"; then | |
148 | candidates="$candidates $(search_merges $branch)" | |
149 | fi | |
150 | if test ! -z "$scan_merge_targets"; then | |
151 | candidates="$candidates $(search_merge_targets $branch)" | |
152 | fi | |
153 | ||
154 | candidates="$(git rev-parse $candidates | sort -u)" | |
155 | ||
156 | if test -z "$candidates"; then | |
157 | hint= | |
158 | test "z$all_strategies" != "ztttt" \ | |
159 | && hint=" (maybe try again with -a)" | |
160 | die "no candidates for $branch found$hint" | |
161 | fi | |
162 | ||
163 | echo "** Candidates for $branch **" | |
164 | for cmt in $candidates; do | |
165 | git --no-pager log --pretty=tformat:"%ct:%h [%cr] %s" --abbrev-commit -1 $cmt | |
166 | done \ | |
167 | | sort -n | cut -d: -f2- | |
168 | ||
169 | newest="$(git rev-list -1 $candidates)" | |
170 | if test ! -z "$dry_run"; then | |
171 | printf "** Most recent: " | |
172 | git --no-pager log -1 --pretty=tformat:"%h %s" $newest | |
173 | elif ! git rev-parse --verify --quiet $new_name >/dev/null; then | |
174 | printf "** Restoring $new_name to " | |
175 | git --no-pager log -1 --pretty=tformat:"%h %s" $newest | |
176 | git branch $new_name $newest | |
177 | else | |
178 | printf "Most recent: " | |
179 | git --no-pager log -1 --pretty=tformat:"%h %s" $newest | |
180 | echo "** $new_name already exists, doing nothing" | |
181 | fi |