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pull: do nothing on --dry-run

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Pull was never meant to take --dry-run at all. However, it
passes unknown arguments to git-fetch, which does do a
dry-run. Unfortunately, pull then attempts to merge whatever
cruft was in FETCH_HEAD (which the dry-run fetch will not
have written to).

Even though we never advertise --dry-run as something that
should work, it is still worth being defensive because:

  1. Other commands (including fetch) take --dry-run, so a
     user might try it.

  2. Rather than simply producing an error, it actually
     changes the repository in totally unexpected ways.

This patch makes "pull --dry-run" equivalent to "fetch
--dry-run".

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Jeff King 2010-05-25 02:07:25 -04:00 committed by Junio C Hamano
parent c8b296450e
commit 29609e6822
1 changed files with 6 additions and 1 deletions
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7
git-pull.sh
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@ -43,6 +43,7 @@ merge_args=
curr_branch=$(git symbolic-ref -q HEAD)
curr_branch_short="${curr_branch#refs/heads/}"
rebase=$(git config --bool branch.$curr_branch_short.rebase)
dry_run=
while :
do
case "$1" in
@ -104,6 +105,9 @@ do
--no-r|--no-re|--no-reb|--no-reba|--no-rebas|--no-rebase)
rebase=false
;;
--d|--dr|--dry|--dry-|--dry-r|--dry-ru|--dry-run)
dry_run=--dry-run
;;
-h|--h|--he|--hel|--help)
usage
;;
@ -216,7 +220,8 @@ test true = "$rebase" && {
done
}
orig_head=$(git rev-parse -q --verify HEAD)
git fetch $verbosity $progress --update-head-ok "$@" || exit 1
git fetch $verbosity $progress $dry_run --update-head-ok "$@" || exit 1
test -z "$dry_run" || exit 0
curr_head=$(git rev-parse -q --verify HEAD)
if test -n "$orig_head" && test "$curr_head" != "$orig_head"