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Automatically upgrade v1 hashes (SHA-1) to v2 (cksum) (#55)

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A new parameter is added to `_autoenv_hash_pair` to specify the version, defaulting to the latest (2). It outputs a `cksum`-based hash for version 2 and `shasum`-based for version 1.
Moves logic to check for an entry in `$AUTOENV_AUTH_FILE` into its own function (`_autoenv_authorized_pair`), as it may need to be called twice.
Modifies `_autoenv_authorized_env_file` to check for v1 entries when v2 fails.

Fixes #53. Alternative implementation to #54.
This commit is contained in:
Rob Speed 2017-01-10 06:07:39 -05:00 committed by Daniel Hahler
parent 398b6f4f54
commit dfb5648505
4 changed files with 97 additions and 26 deletions
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52
autoenv.zsh
View File

@ -168,28 +168,56 @@ _autoenv_debug() {
# }}}
# Generate hash pair for a given file ($1).
# A fixed hash value can be given as 2nd arg, but is used with tests only.
# Generate hash pair for a given file ($1) and version ($2).
# A fixed hash value can be given as 3rd arg, but is used with tests only.
# The format is ":$file:$hash:$version".
_autoenv_hash_pair() {
local env_file=${1:A}
local env_cksum=${2:-}
local cksum_version=${2:-2}
local env_cksum=${3:-}
if [[ -z $env_cksum ]]; then
if ! [[ -e $env_file ]]; then
echo "Missing file argument for _autoenv_hash_pair!" >&2
return 1
fi
# Get the output from `cksum` and join the first two words with a dot.
env_cksum=${(j:.:)${:-$(cksum "$env_file")}[1,2]}
if [ $cksum_version = 2 ]; then
# Get the output from `cksum` and join the first two words with a dot.
env_cksum=${(j:.:)${:-$(cksum "$env_file")}[1,2]}
elif [ $cksum_version = 1 ]; then
env_cksum=$(shasum $env_file | cut -d' ' -f1)
else
echo "Invalid version argument (${cksum_version}) for _autoenv_hash_pair!" >&2
return 1
fi
fi
echo ":${env_file}:${env_cksum}:1"
echo ":${env_file}:${env_cksum}:${cksum_version}"
}
# Checks for the existence of a hash signature in the auth file
_autoenv_authorized_pair() {
local pair=$1
test -f $AUTOENV_AUTH_FILE \
&& \grep -qF $pair $AUTOENV_AUTH_FILE
}
_autoenv_authorized_env_file() {
local env_file=$1
local pair="$(_autoenv_hash_pair $env_file)"
test -f $AUTOENV_AUTH_FILE \
&& \grep -qF $pair $AUTOENV_AUTH_FILE
local pair
pair=$(_autoenv_hash_pair $env_file)
_autoenv_debug "v2 pair: ${pair}"
if ! _autoenv_authorized_pair $pair; then
# Fallback for v1 (SHA-1) pairs
pair=$(_autoenv_hash_pair $env_file 1)
_autoenv_debug "v1 pair: ${pair}"
if _autoenv_authorized_pair $pair; then
# Upgrade v1 entries to v2
_autoenv_authorize $env_file
else
return 1
fi
fi
}
_autoenv_authorize() {
@ -200,12 +228,12 @@ _autoenv_authorize() {
}
# Deauthorize a given filename, by removing it from the auth file.
# This uses `test -s` to only handle non-empty files, and a subshell to
# allow for writing to the same file again.
# This uses `test -s` to only handle non-empty files.
_autoenv_deauthorize() {
local env_file=${1:A}
if [[ -s $AUTOENV_AUTH_FILE ]]; then
echo "$(\grep -vF :${env_file}: $AUTOENV_AUTH_FILE)" >| $AUTOENV_AUTH_FILE
\grep -vF :${env_file}: $AUTOENV_AUTH_FILE >| $AUTOENV_AUTH_FILE.tmp
\mv $AUTOENV_AUTH_FILE.tmp $AUTOENV_AUTH_FILE
fi
}

24
tests/_autoenv_utils.t
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@ -35,41 +35,41 @@ Now adding some auth pair.
$ echo first > first
$ _autoenv_authorize first
$ cat $AUTOENV_AUTH_FILE
:/tmp/cramtests-*/_autoenv_utils.t/first:2715464726.6:1 (glob)
:/tmp/cramtests-*/_autoenv_utils.t/first:2715464726.6:2 (glob)
And a second one.
$ echo second > second
$ _autoenv_authorize second
$ cat $AUTOENV_AUTH_FILE
:/tmp/cramtests-*/_autoenv_utils.t/first:2715464726.6:1 (glob)
:/tmp/cramtests-*/_autoenv_utils.t/second:594940475.7:1 (glob)
:/tmp/cramtests-*/_autoenv_utils.t/first:2715464726.6:2 (glob)
:/tmp/cramtests-*/_autoenv_utils.t/second:594940475.7:2 (glob)
And a third.
$ echo third > third
$ _autoenv_authorize third
$ cat $AUTOENV_AUTH_FILE
:/tmp/cramtests-*/_autoenv_utils.t/first:2715464726.6:1 (glob)
:/tmp/cramtests-*/_autoenv_utils.t/second:594940475.7:1 (glob)
:/tmp/cramtests-*/_autoenv_utils.t/third:451243482.6:1 (glob)
:/tmp/cramtests-*/_autoenv_utils.t/first:2715464726.6:2 (glob)
:/tmp/cramtests-*/_autoenv_utils.t/second:594940475.7:2 (glob)
:/tmp/cramtests-*/_autoenv_utils.t/third:451243482.6:2 (glob)
Re-add the second one, with the same hash.
$ _autoenv_authorize second
$ cat $AUTOENV_AUTH_FILE
:/tmp/cramtests-*/_autoenv_utils.t/first:2715464726.6:1 (glob)
:/tmp/cramtests-*/_autoenv_utils.t/third:451243482.6:1 (glob)
:/tmp/cramtests-*/_autoenv_utils.t/second:594940475.7:1 (glob)
:/tmp/cramtests-*/_autoenv_utils.t/first:2715464726.6:2 (glob)
:/tmp/cramtests-*/_autoenv_utils.t/third:451243482.6:2 (glob)
:/tmp/cramtests-*/_autoenv_utils.t/second:594940475.7:2 (glob)
Re-add the first one, with a new hash.
$ echo one more line >> first
$ _autoenv_authorize first
$ cat $AUTOENV_AUTH_FILE
:/tmp/cramtests-*/_autoenv_utils.t/third:451243482.6:1 (glob)
:/tmp/cramtests-*/_autoenv_utils.t/second:594940475.7:1 (glob)
:/tmp/cramtests-*/_autoenv_utils.t/first:3620404822.20:1 (glob)
:/tmp/cramtests-*/_autoenv_utils.t/third:451243482.6:2 (glob)
:/tmp/cramtests-*/_autoenv_utils.t/second:594940475.7:2 (glob)
:/tmp/cramtests-*/_autoenv_utils.t/first:3620404822.20:2 (glob)
}}}

4
tests/setup.zsh
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@ -28,9 +28,9 @@ if [[ -f $AUTOENV_AUTH_FILE ]]; then
echo -n >| $AUTOENV_AUTH_FILE
fi
# Add file $1 (with optional hash $2) to authentication file.
# Add file ($1), version ($2), and optional hash ($3) to authentication file.
test_autoenv_add_to_env() {
_autoenv_hash_pair $1 ${2:-} >>| $AUTOENV_AUTH_FILE
_autoenv_hash_pair $1 1 ${2:-} >>| $AUTOENV_AUTH_FILE
}
# Add enter and leave env files to authentication file.

43
tests/upgrade_hash.t Normal file
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@ -0,0 +1,43 @@
Tests for upgrading hashes.
$ source $TESTDIR/setup.zsh || return 1
$ mkdir -p sub
$ mkdir -p ${AUTOENV_AUTH_FILE:h}
Create a single v1 hash entry.
$ echo 'echo ENTERED' > sub/$AUTOENV_FILE_ENTER
$ echo 'echo LEAVE' > sub/$AUTOENV_FILE_LEAVE
$ echo :$PWD/sub/$AUTOENV_FILE_ENTER:4c403f1870af2ab5472370a42b6b2b488cefe83c:1 > $AUTOENV_AUTH_FILE
$ cd sub
ENTERED
Hashes should get upgraded automatically.
This also tests that there are no empty lines being added to the auth file when
de-authenticating the old hash.
$ cat $AUTOENV_AUTH_FILE
:/tmp/cramtests-*/upgrade_hash.t/sub/.autoenv.zsh:3679467995.13:2 (glob)
Re-create auth file with v1 hashes for both auth files.
$ echo :$PWD/$AUTOENV_FILE_LEAVE:882cf0333ea3c35537c9459c08d8987f25087ea9:1 > $AUTOENV_AUTH_FILE
$ echo :$PWD/$AUTOENV_FILE_ENTER:4c403f1870af2ab5472370a42b6b2b488cefe83c:1 >> $AUTOENV_AUTH_FILE
Only the leave file's hash should get updated.
$ cd ..
LEAVE
$ cat $AUTOENV_AUTH_FILE
:/tmp/cramtests-*/upgrade_hash.t/sub/.autoenv.zsh:4c403f1870af2ab5472370a42b6b2b488cefe83c:1 (glob)
:/tmp/cramtests-*/upgrade_hash.t/sub/.autoenv_leave.zsh:803077150.11:2 (glob)
The enter file's hash should get updated.
$ cd sub
ENTERED
$ cat $AUTOENV_AUTH_FILE
:/tmp/cramtests-*/upgrade_hash.t/sub/.autoenv_leave.zsh:803077150.11:2 (glob)
:/tmp/cramtests-*/upgrade_hash.t/sub/.autoenv.zsh:3679467995.13:2 (glob)