Protect scripted Porcelains from GREP_OPTIONS insanity

If the user has exported the GREP_OPTIONS environment variable, the output
from "grep" and "egrep" in scripted Porcelains may be different from what
they expect.  For example, we may want to count number of matching lines,
by "grep" piped to "wc -l", and GREP_OPTIONS=-C3 will break such use.

The approach taken by this change to address this issue is to protect only
our own use of grep/egrep.  Because we do not unset it at the beginning of
our scripts, hook scripts run from the scripted Porcelains are exposed to
the same insanity this environment variable causes when grep/egrep is used
to implement logic (e.g. "grep | wc -l"), and it is entirely up to the
hook scripts to protect themselves.

On the other hand, applypatch-msg hook may want to show offending words in
the proposed commit log message using grep to the end user, and the user
might want to set GREP_OPTIONS=--color to paint the match more visibly.
The approach to protect only our own use without unsetting the environment
variable globally will allow this use case.

Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/git-am.sh b/git-am.sh
index c132f50..b49f26a 100755 (executable)
--- a/git-am.sh
+++ b/git-am.sh
@@ -205,7 +205,7 @@ check_patch_format () {
                        # and see if it looks like that they all begin with the
                        # header field names...
                        sed -n -e '/^$/q' -e '/^[       ]/d' -e p "$1" |
-                       LC_ALL=C egrep -v '^[!-9;-~]+:' >/dev/null ||
+                       sane_egrep -v '^[!-9;-~]+:' >/dev/null ||
                        patch_format=mbox
                fi
        } < "$1" || clean_abort
@@ -554,7 +554,7 @@ do
                        stop_here $this
 
                # skip pine's internal folder data
-               grep '^Author: Mail System Internal Data$' \
+               sane_grep '^Author: Mail System Internal Data$' \
                        <"$dotest"/info >/dev/null &&
                        go_next && continue
 

diff --git a/git-bisect.sh b/git-bisect.sh
index 6f6f039..0c422d5 100755 (executable)
--- a/git-bisect.sh
+++ b/git-bisect.sh
@@ -393,7 +393,7 @@ bisect_run () {
 
       cat "$GIT_DIR/BISECT_RUN"
 
-      if grep "first bad commit could be any of" "$GIT_DIR/BISECT_RUN" \
+      if sane_grep "first bad commit could be any of" "$GIT_DIR/BISECT_RUN" \
                > /dev/null; then
          echo >&2 "bisect run cannot continue any more"
          exit $res
@@ -405,7 +405,7 @@ bisect_run () {
          exit $res
       fi
 
-      if grep "is the first bad commit" "$GIT_DIR/BISECT_RUN" > /dev/null; then
+      if sane_grep "is the first bad commit" "$GIT_DIR/BISECT_RUN" > /dev/null; then
          echo "bisect run success"
          exit 0;
       fi

diff --git a/git-filter-branch.sh b/git-filter-branch.sh
index a480d6f..8ef1bde 100755 (executable)
--- a/git-filter-branch.sh
+++ b/git-filter-branch.sh
@@ -457,7 +457,7 @@ if [ "$filter_tag_name" ]; then
                                git mktag) ||
                                die "Could not create new tag object for $ref"
                        if git cat-file tag "$ref" | \
-                          grep '^-----BEGIN PGP SIGNATURE-----' >/dev/null 2>&1
+                          sane_grep '^-----BEGIN PGP SIGNATURE-----' >/dev/null 2>&1
                        then
                                warn "gpg signature stripped from tag object $sha1t"
                        fi

diff --git a/git-instaweb.sh b/git-instaweb.sh
index d96eddb..84805c6 100755 (executable)
--- a/git-instaweb.sh
+++ b/git-instaweb.sh
@@ -41,7 +41,7 @@ resolve_full_httpd () {
        case "$httpd" in
        *apache2*|*lighttpd*)
                # ensure that the apache2/lighttpd command ends with "-f"
-               if ! echo "$httpd" | grep -- '-f *$' >/dev/null 2>&1
+               if ! echo "$httpd" | sane_grep -- '-f *$' >/dev/null 2>&1
                then
                        httpd="$httpd -f"
                fi
@@ -297,8 +297,8 @@ EOF
 
        # check to see if Dennis Stosberg's mod_perl compatibility patch
        # (<20060621130708.Gcbc6e5c@leonov.stosberg.net>) has been applied
-       if test -f "$module_path/mod_perl.so" && grep 'MOD_PERL' \
-                               "$GIT_DIR/gitweb/gitweb.cgi" >/dev/null
+       if test -f "$module_path/mod_perl.so" &&
+          sane_grep 'MOD_PERL' "$GIT_DIR/gitweb/gitweb.cgi" >/dev/null
        then
                # favor mod_perl if available
                cat >> "$conf" <<EOF
@@ -316,7 +316,7 @@ EOF
                # plain-old CGI
                resolve_full_httpd
                list_mods=$(echo "$full_httpd" | sed "s/-f$/-l/")
-               $list_mods | grep 'mod_cgi\.c' >/dev/null 2>&1 || \
+               $list_mods | sane_grep 'mod_cgi\.c' >/dev/null 2>&1 || \
                echo "LoadModule cgi_module $module_path/mod_cgi.so" >> "$conf"
                cat >> "$conf" <<EOF
 AddHandler cgi-script .cgi

diff --git a/git-rebase--interactive.sh b/git-rebase--interactive.sh
index 23ded48..6268e76 100755 (executable)
--- a/git-rebase--interactive.sh
+++ b/git-rebase--interactive.sh
@@ -106,8 +106,8 @@ mark_action_done () {
        sed -e 1q < "$TODO" >> "$DONE"
        sed -e 1d < "$TODO" >> "$TODO".new
        mv -f "$TODO".new "$TODO"
-       count=$(grep -c '^[^#]' < "$DONE")
-       total=$(($count+$(grep -c '^[^#]' < "$TODO")))
+       count=$(sane_grep -c '^[^#]' < "$DONE")
+       total=$(($count+$(sane_grep -c '^[^#]' < "$TODO")))
        if test "$last_count" != "$count"
        then
                last_count=$count
@@ -147,7 +147,7 @@ die_abort () {
 }
 
 has_action () {
-       grep '^[^#]' "$1" >/dev/null
+       sane_grep '^[^#]' "$1" >/dev/null
 }
 
 pick_one () {
@@ -731,7 +731,7 @@ first and then run 'git rebase --continue' again."
                        git rev-list $REVISIONS |
                        while read rev
                        do
-                               if test -f "$REWRITTEN"/$rev -a "$(grep "$rev" "$DOTEST"/not-cherry-picks)" = ""
+                               if test -f "$REWRITTEN"/$rev -a "$(sane_grep "$rev" "$DOTEST"/not-cherry-picks)" = ""
                                then
                                        # Use -f2 because if rev-list is telling us this commit is
                                        # not worthwhile, we don't want to track its multiple heads,
@@ -739,7 +739,7 @@ first and then run 'git rebase --continue' again."
                                        # be rebasing on top of it
                                        git rev-list --parents -1 $rev | cut -d' ' -s -f2 > "$DROPPED"/$rev
                                        short=$(git rev-list -1 --abbrev-commit --abbrev=7 $rev)
-                                       grep -v "^[a-z][a-z]* $short" <"$TODO" > "${TODO}2" ; mv "${TODO}2" "$TODO"
+                                       sane_grep -v "^[a-z][a-z]* $short" <"$TODO" > "${TODO}2" ; mv "${TODO}2" "$TODO"
                                        rm "$REWRITTEN"/$rev
                                fi
                        done

diff --git a/git-rebase.sh b/git-rebase.sh
index 6ec155c..0ec4355 100755 (executable)
--- a/git-rebase.sh
+++ b/git-rebase.sh
@@ -467,7 +467,7 @@ orig_head=$branch
 mb=$(git merge-base "$onto" "$branch")
 if test "$upstream" = "$onto" && test "$mb" = "$onto" &&
        # linear history?
-       ! (git rev-list --parents "$onto".."$branch" | grep " .* ") > /dev/null
+       ! (git rev-list --parents "$onto".."$branch" | sane_grep " .* ") > /dev/null
 then
        if test -z "$force_rebase"
        then

diff --git a/git-sh-setup.sh b/git-sh-setup.sh
index c41c2f7..aa07cc3 100755 (executable)
--- a/git-sh-setup.sh
+++ b/git-sh-setup.sh
@@ -114,6 +114,14 @@ git_editor() {
        eval "${GIT_EDITOR:=vi}" '"$@"'
 }
 
+sane_grep () {
+       GREP_OPTIONS= LC_ALL=C grep "$@"
+}
+
+sane_egrep () {
+       GREP_OPTIONS= LC_ALL=C egrep "$@"
+}
+
 is_bare_repository () {
        git rev-parse --is-bare-repository
 }

diff --git a/git-submodule.sh b/git-submodule.sh
index 0462e52..b7ccd12 100755 (executable)
--- a/git-submodule.sh
+++ b/git-submodule.sh
@@ -57,7 +57,7 @@ resolve_relative_url ()
 #
 module_list()
 {
-       git ls-files --error-unmatch --stage -- "$@" | grep '^160000 '
+       git ls-files --error-unmatch --stage -- "$@" | sane_grep '^160000 '
 }
 
 #
@@ -567,7 +567,7 @@ cmd_summary() {
        cd_to_toplevel
        # Get modified modules cared by user
        modules=$(git $diff_cmd $cached --raw $head -- "$@" |
-               egrep '^:([0-7]* )?160000' |
+               sane_egrep '^:([0-7]* )?160000' |
                while read mod_src mod_dst sha1_src sha1_dst status name
                do
                        # Always show modules deleted or type-changed (blob<->module)
@@ -581,7 +581,7 @@ cmd_summary() {
        test -z "$modules" && return
 
        git $diff_cmd $cached --raw $head -- $modules |
-       egrep '^:([0-7]* )?160000' |
+       sane_egrep '^:([0-7]* )?160000' |
        cut -c2- |
        while read mod_src mod_dst sha1_src sha1_dst status name
        do