tests/printenv.py

purge: abort with missing files avoiding problems with name-mangling fs

In a name mangling filesystem (e.g. a case insensitive one)
dirstate.walk() can yield filenames different from the ones
stored in the dirstate. This already confuses the status and
add commands, but with purge this may cause data loss.

To prevent this purge refuses to work if there are missing
files and has a 'force' option if the user knows it is safe.

Even with the force option purge checks if any of the missing
files is still available in the working dir: if so there
may be some problem with the underlying filesystem, so it
unconditionally aborts.

# simple script to be used in hooks
# copy it to the current directory when the test starts:
#
#     cp "$TESTDIR"/printenv.py .
#
# put something like this in the repo .hg/hgrc:
#
#     [hooks]
#     changegroup = python ../printenv.py <hookname> [exit] [output]
#
#   - <hookname> is a mandatory argument (e.g. "changegroup")
#   - [exit] is the exit code of the hook (default: 0)
#   - [output] is the name of the output file (default: use sys.stdout)
#              the file will be opened in append mode.
#
import os
import sys

exitcode = 0
out = sys.stdout

name = sys.argv[1]
if len(sys.argv) > 2:
    exitcode = int(sys.argv[2])
    if len(sys.argv) > 3:
        out = open(sys.argv[3], "ab")

env = [v for v in os.environ if v.startswith("HG_")]
env.sort()

# edit the variable part of the variable
url = os.environ.get("HG_URL", "")
if url.startswith("file:"):
    os.environ["HG_URL"] = "file:"
elif url.startswith("remote:http"):
    os.environ["HG_URL"] = "remote:http"

out.write("%s hook: " % name)
for v in env:
    out.write("%s=%s " % (v, os.environ[v]))
out.write("\n")
out.close()

sys.exit(exitcode)