comparison tests/test-import.t @ 50725:7e5be4a7cda7 stable

tests: use grep -E instead of obsolescent egrep

Testing on Fedora 38 failed with:
  egrep: warning: egrep is obsolescent; using grep -E

The warning comes from
https://git.savannah.gnu.org/cgit/grep.git/commit/?id=a9515624709865d480e3142fd959bccd1c9372d1
. For further anecdotal evidence of the change, see
https://www.phoronix.com/news/GNU-Grep-3.8-Stop-egrep-fgrep .

This reverses the code check that goes back to e7d3b509af8b. grep -E is POSIX,
but there is a risk that it doesn't work the same on all platforms - especially
older Unix versions. It should however always be possible to put a GNU grep in
$PATH before running the tests.

50724:a10d823a8e3d

  adding file changes
  added 1 changesets with 2 changes to 2 files
  new changesets 80971e65b431
  updating to branch default
  2 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ egrep -v '^(Subject|email)' msg.patch | hg --cwd b import -
  applying patch from stdin
  abort: empty commit message
  [10]
  $ rm -r b

50725:7e5be4a7cda7

  adding file changes
  added 1 changesets with 2 changes to 2 files
  new changesets 80971e65b431
  updating to branch default
  2 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ grep -E -v '^(Subject|email)' msg.patch | hg --cwd b import -
  applying patch from stdin
  abort: empty commit message
  [10]
  $ rm -r b