git/git-rebase--merge.sh

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remove #!interpreter line from shell libraries In a shell snippet meant to be sourced by other shell scripts, an opening #! line does more harm than good. The harm: - When the shell library is sourced, the interpreter and options from the #! line are not used. Specifying a particular shell can confuse the reader into thinking it is safe for the shell library to rely on idiosyncrasies of that shell. - Using #! instead of a plain comment drops a helpful visual clue that this is a shell library and not a self-contained script. - Tools such as lintian can use a #! line to tell when an installation script has failed by forgetting to set a script executable. This check does not work if shell libraries also start with a #! line. The good: - Text editors notice the #! line and use it for syntax highlighting if you try to edit the installed scripts (without ".sh" suffix) in place. The use of the #! for file type detection is not needed because Git's shell libraries are meant to be edited in source form (with ".sh" suffix). Replace the opening #! lines with comments. This involves tweaking the test harness's valgrind support to find shell libraries by looking for "# " in the first line instead of "#!" (see v1.7.6-rc3~7, 2011-06-17). Suggested by Russ Allbery through lintian. Thanks to Jeff King and Clemens Buchacher for further analysis. Tested by searching for non-executable scripts with #! line: find . -name .git -prune -o -type f -not -executable | while read file do read line <"$file" case $line in '#!'*) echo "$file" ;; esac done The only remaining scripts found are templates for shell scripts (unimplemented.sh, wrap-for-bin.sh) and sample input used in tests (t/t4034/perl/{pre,post}). Signed-off-by: Jonathan Nieder <jrnieder@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2013-11-26 01:03:52 +04:00
# This shell script fragment is sourced by git-rebase to implement
# its merge-based non-interactive mode that copes well with renamed
# files.
#
# Copyright (c) 2010 Junio C Hamano.
#
prec=4
read_state () {
onto_name=$(cat "$state_dir"/onto_name) &&
end=$(cat "$state_dir"/end) &&
msgnum=$(cat "$state_dir"/msgnum)
}
continue_merge () {
test -d "$state_dir" || die "$state_dir directory does not exist"
unmerged=$(git ls-files -u)
if test -n "$unmerged"
then
echo "You still have unmerged paths in your index"
echo "did you forget to use git add?"
die "$resolvemsg"
fi
cmt=$(cat "$state_dir/current")
if ! git diff-index --quiet --ignore-submodules HEAD --
then
if ! git commit ${gpg_sign_opt:+"$gpg_sign_opt"} --no-verify -C "$cmt"
then
echo "Commit failed, please do not call \"git commit\""
echo "directly, but instead do one of the following: "
die "$resolvemsg"
fi
if test -z "$GIT_QUIET"
then
printf "Committed: %0${prec}d " $msgnum
fi
echo "$cmt $(git rev-parse HEAD^0)" >> "$state_dir/rewritten"
else
if test -z "$GIT_QUIET"
then
printf "Already applied: %0${prec}d " $msgnum
fi
fi
test -z "$GIT_QUIET" &&
GIT_PAGER='' git log --format=%s -1 "$cmt"
# onto the next patch:
msgnum=$(($msgnum + 1))
echo "$msgnum" >"$state_dir/msgnum"
}
call_merge () {
msgnum="$1"
echo "$msgnum" >"$state_dir/msgnum"
cmt="$(cat "$state_dir/cmt.$msgnum")"
echo "$cmt" > "$state_dir/current"
hd=$(git rev-parse --verify HEAD)
cmt_name=$(git symbolic-ref HEAD 2> /dev/null || echo HEAD)
eval GITHEAD_$cmt='"${cmt_name##refs/heads/}~$(($end - $msgnum))"'
eval GITHEAD_$hd='$onto_name'
export GITHEAD_$cmt GITHEAD_$hd
if test -n "$GIT_QUIET"
then
GIT_MERGE_VERBOSITY=1 && export GIT_MERGE_VERBOSITY
fi
test -z "$strategy" && strategy=recursive
eval 'git-merge-$strategy' $strategy_opts '"$cmt^" -- "$hd" "$cmt"'
rv=$?
case "$rv" in
0)
unset GITHEAD_$cmt GITHEAD_$hd
return
;;
1)
git rerere $allow_rerere_autoupdate
die "$resolvemsg"
;;
2)
echo "Strategy: $strategy failed, try another" 1>&2
die "$resolvemsg"
;;
*)
die "Unknown exit code ($rv) from command:" \
"git-merge-$strategy $cmt^ -- HEAD $cmt"
;;
esac
}
finish_rb_merge () {
move_to_original_branch
if test -s "$state_dir"/rewritten
then
git notes copy --for-rewrite=rebase <"$state_dir"/rewritten
if test -x "$GIT_DIR"/hooks/post-rewrite
then
"$GIT_DIR"/hooks/post-rewrite rebase <"$state_dir"/rewritten
fi
fi
say All done.
}
rebase: avoid non-function use of "return" on FreeBSD Since a1549e10, 15d4bf2e and 01a1e646 (first appearing in v1.8.4) the git-rebase--*.sh scripts have used a "return" to stop execution of the dot-sourced file and return to the "dot" command that dot-sourced it. The /bin/sh utility on FreeBSD however behaves poorly under some circumstances when such a "return" is executed. In particular, if the "dot" command is contained within a function, then when a "return" is executed by the script it runs (that is not itself inside a function), control will return from the function that contains the "dot" command skipping any statements that might follow the dot command inside that function. Commit 99855ddf (first appearing in v1.8.4.1) addresses this by making the "dot" command the last line in the function. Unfortunately the FreeBSD /bin/sh may also execute some statements in the script run by the "dot" command that appear after the troublesome "return". The fix in 99855ddf does not address this problem. For example, if you have script1.sh with these contents: run_script2() { . "$(dirname -- "$0")/script2.sh" _e=$? echo only this line should show [ $_e -eq 5 ] || echo expected status 5 got $_e return 3 } run_script2 e=$? [ $e -eq 3 ] || { echo expected status 3 got $e; exit 1; } And script2.sh with these contents: if [ 5 -gt 3 ]; then return 5 fi case bad in *) echo always shows esac echo should not get here ! : When running script1.sh (e.g. '/bin/sh script1.sh' or './script1.sh' after making it executable), the expected output from a POSIX shell is simply the single line: only this line should show However, when run using FreeBSD's /bin/sh, the following output appears instead: should not get here expected status 3 got 1 Not only did the lines following the "dot" command in the run_script2 function in script1.sh get skipped, but additional lines in script2.sh following the "return" got executed -- but not all of them (e.g. the "echo always shows" line did not run). These issues can be avoided by not using a top-level "return" in script2.sh. If script2.sh is changed to this: main() { if [ 5 -gt 3 ]; then return 5 fi case bad in *) echo always shows esac echo should not get here ! : } main Then it behaves the same when using FreeBSD's /bin/sh as when using other more POSIX compliant /bin/sh implementations. We fix the git-rebase--*.sh scripts in a similar fashion by moving the top-level code that contains "return" statements into its own function and then calling that as the last line in the script. Signed-off-by: Kyle J. McKay <mackyle@gmail.com> Acked-by: Matthieu Moy <Matthieu.Moy@imag.fr> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2014-04-11 12:28:17 +04:00
# The whole contents of this file is run by dot-sourcing it from
# inside a shell function. It used to be that "return"s we see
# below were not inside any function, and expected to return
# to the function that dot-sourced us.
#
# However, FreeBSD /bin/sh misbehaves on such a construct and
# continues to run the statements that follow such a "return".
# As a work-around, we introduce an extra layer of a function
# here, and immediately call it after defining it.
git_rebase__merge () {
case "$action" in
continue)
read_state
continue_merge
while test "$msgnum" -le "$end"
do
call_merge "$msgnum"
continue_merge
done
finish_rb_merge
return
;;
skip)
read_state
git rerere clear
msgnum=$(($msgnum + 1))
while test "$msgnum" -le "$end"
do
call_merge "$msgnum"
continue_merge
done
finish_rb_merge
return
;;
esac
mkdir -p "$state_dir"
echo "$onto_name" > "$state_dir/onto_name"
write_basic_state
msgnum=0
for cmt in $(git rev-list --reverse --no-merges "$revisions")
do
msgnum=$(($msgnum + 1))
echo "$cmt" > "$state_dir/cmt.$msgnum"
done
echo 1 >"$state_dir/msgnum"
echo $msgnum >"$state_dir/end"
end=$msgnum
msgnum=1
while test "$msgnum" -le "$end"
do
call_merge "$msgnum"
continue_merge
done
finish_rb_merge
rebase: avoid non-function use of "return" on FreeBSD Since a1549e10, 15d4bf2e and 01a1e646 (first appearing in v1.8.4) the git-rebase--*.sh scripts have used a "return" to stop execution of the dot-sourced file and return to the "dot" command that dot-sourced it. The /bin/sh utility on FreeBSD however behaves poorly under some circumstances when such a "return" is executed. In particular, if the "dot" command is contained within a function, then when a "return" is executed by the script it runs (that is not itself inside a function), control will return from the function that contains the "dot" command skipping any statements that might follow the dot command inside that function. Commit 99855ddf (first appearing in v1.8.4.1) addresses this by making the "dot" command the last line in the function. Unfortunately the FreeBSD /bin/sh may also execute some statements in the script run by the "dot" command that appear after the troublesome "return". The fix in 99855ddf does not address this problem. For example, if you have script1.sh with these contents: run_script2() { . "$(dirname -- "$0")/script2.sh" _e=$? echo only this line should show [ $_e -eq 5 ] || echo expected status 5 got $_e return 3 } run_script2 e=$? [ $e -eq 3 ] || { echo expected status 3 got $e; exit 1; } And script2.sh with these contents: if [ 5 -gt 3 ]; then return 5 fi case bad in *) echo always shows esac echo should not get here ! : When running script1.sh (e.g. '/bin/sh script1.sh' or './script1.sh' after making it executable), the expected output from a POSIX shell is simply the single line: only this line should show However, when run using FreeBSD's /bin/sh, the following output appears instead: should not get here expected status 3 got 1 Not only did the lines following the "dot" command in the run_script2 function in script1.sh get skipped, but additional lines in script2.sh following the "return" got executed -- but not all of them (e.g. the "echo always shows" line did not run). These issues can be avoided by not using a top-level "return" in script2.sh. If script2.sh is changed to this: main() { if [ 5 -gt 3 ]; then return 5 fi case bad in *) echo always shows esac echo should not get here ! : } main Then it behaves the same when using FreeBSD's /bin/sh as when using other more POSIX compliant /bin/sh implementations. We fix the git-rebase--*.sh scripts in a similar fashion by moving the top-level code that contains "return" statements into its own function and then calling that as the last line in the script. Signed-off-by: Kyle J. McKay <mackyle@gmail.com> Acked-by: Matthieu Moy <Matthieu.Moy@imag.fr> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2014-04-11 12:28:17 +04:00
}
# ... and then we call the whole thing.
git_rebase__merge