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pager: catch startup failures on Windows

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If the user's pager settings are broken, display an error message
rather than crash to avoid confusing them.

Bug: https://crbug.com/gerrit/16173
Change-Id: Idc0891da783c68f3a96ac53a82781e34e40421fb
Reviewed-on: https://gerrit-review.googlesource.com/c/git-repo/+/343437
Reviewed-by: LaMont Jones <lamontjones@google.com>
Tested-by: Mike Frysinger <vapier@google.com>
This commit is contained in:
Mike Frysinger 2022-08-18 07:45:43 -04:00
parent 7fa8eedd8f
commit 3c2d807905
1 changed files with 5 additions and 2 deletions
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7
pager.py
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@ -56,8 +56,11 @@ def _PipePager(pager):
global pager_process, old_stdout, old_stderr global pager_process, old_stdout, old_stderr
assert pager_process is None, "Only one active pager process at a time" assert pager_process is None, "Only one active pager process at a time"
# Create pager process, piping stdout/err into its stdin # Create pager process, piping stdout/err into its stdin
pager_process = subprocess.Popen([pager], stdin=subprocess.PIPE, stdout=sys.stdout, try:
stderr=sys.stderr) pager_process = subprocess.Popen([pager], stdin=subprocess.PIPE, stdout=sys.stdout,
stderr=sys.stderr)
except FileNotFoundError:
sys.exit(f'fatal: cannot start pager "{pager}"')
old_stdout = sys.stdout old_stdout = sys.stdout
old_stderr = sys.stderr old_stderr = sys.stderr
sys.stdout = pager_process.stdin sys.stdout = pager_process.stdin