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Add mtime/atime store/restore.

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Darren 'Tadgy' Austin 2023-12-17 15:39:43 +00:00
commit a7e5c62d2e
2 changed files with 21 additions and 10 deletions
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4
README.md
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@ -1,7 +1,7 @@
GitAttributesDB GitAttributesDB
=============== ===============
This is a git hook to store/restore attributes (ownerships, permissions and - on Linux - ACLs) for files stored in a git repository, and for any extra This is a git hook to store/restore attributes (access/modification times, ownerships, permissions and - on Linux - ACLs) for files stored in a git
files configured for attribute store/restore. repository, and for any extra files configured for attribute store/restore.
This hook can be used in place of programs such as **etckeeper** to automatically (once set up) record and restore the attributes for files in your `/etc` This hook can be used in place of programs such as **etckeeper** to automatically (once set up) record and restore the attributes for files in your `/etc`
directory. directory.

27
gitattributsdb
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@ -11,7 +11,7 @@ DB_EXTRA=".gitattributsdb-extra" # List of base64 encoded filenames (one per lin
# Where '<filename>' is relative to the repository root. # Where '<filename>' is relative to the repository root.
# Variables. # Variables.
declare -A DB_OWNERSHIPS DB_MODES DB_ACLS declare -A DB_ACLS DB_ATIMES DB_MODES DB_MTIMES DB_OWNERSHIPS
# shellcheck disable=SC2155 # shellcheck disable=SC2155
declare PLATFORM="$(uname -s)" declare PLATFORM="$(uname -s)"
@ -49,14 +49,16 @@ show_help() {
# Function to read the database into an array. # Function to read the database into an array.
read_db() { read_db() {
local FILENAME MODE OWNERSHIP ACL local ACL ATIME FILENAME MODE MTIME OWNERSHIP
# Do nothing if the DB file doesn't exist. # Do nothing if the DB file doesn't exist.
[[ ! -e "$DB_FILE" ]] && return 0 [[ ! -e "$DB_FILE" ]] && return 0
# Read the file. # Read the file.
while read -r FILENAME OWNERSHIP MODE ACL; do while read -r FILENAME MTIME ATIME OWNERSHIP MODE ACL; do
# Store the attributes in arrays. # Store the attributes in arrays.
DB_MTIMES[$FILENAME]="$MTIME"
DB_ATIMES[$FILENAME]="$ATIME"
DB_OWNERSHIPS[$FILENAME]="$OWNERSHIP" DB_OWNERSHIPS[$FILENAME]="$OWNERSHIP"
DB_MODES[$FILENAME]="$MODE" DB_MODES[$FILENAME]="$MODE"
DB_ACLS[$FILENAME]="$ACL" DB_ACLS[$FILENAME]="$ACL"
@ -89,12 +91,12 @@ store_attributes() {
if [[ "$PLATFORM" == "Linux" ]]; then if [[ "$PLATFORM" == "Linux" ]]; then
# On Linux, we can handle ACLs too. # On Linux, we can handle ACLs too.
printf "%s %s %s\\n" "$(printf "%s" "$FILE" | base64 -w 0 2>/dev/null)" "$(stat --printf '%U:%G %.4a' -- "$FILE" 2>/dev/null)" \ printf "%s %s %s\\n" "$(printf "%s" "$FILE" | base64 -w 0 2>/dev/null)" "$(stat --printf '%.9Y %.9X %U:%G %.4a' -- "$FILE" 2>/dev/null)" \
"$(getfacl -cEsp -- "$FILE" 2>/dev/null | base64 -w 0 2>/dev/null)" >>"$DB_TMP" "$(getfacl -cEsp -- "$FILE" 2>/dev/null | base64 -w 0 2>/dev/null)" >>"$DB_TMP"
elif [[ "$PLATFORM" == "Darwin" ]]; then elif [[ "$PLATFORM" == "Darwin" ]]; then
# Darwin just has to be different. # Darwin just has to be different.
# Use the full path to Darwin's stat, in case there's a macports/brew/etc version installed. # Use the full path to Darwin's stat, in case there's a macports/brew/etc version installed.
printf "%s %s\\n" "$(printf "%s" "$FILE" | base64 2>/dev/null)" "$(/usr/bin/stat -f "%Su:%Sg %Mp%Lp" -- "$FILE" 2>/dev/null)" >>"$DB_TMP" printf "%s %s\\n" "$(printf "%s" "$FILE" | base64 -b 0 2>/dev/null)" "$(/usr/bin/stat -f '%Fm %Fa %Su:%Sg %Mp%Lp' -- "$FILE" 2>/dev/null)" >>"$DB_TMP"
fi fi
(( COUNT++ )) (( COUNT++ ))
@ -144,9 +146,18 @@ restore_attributes() {
chmod -- "${DB_MODES[$ID]}" "$FILE" 2>/dev/null || warn "Failed to restore permissions: $FILE" chmod -- "${DB_MODES[$ID]}" "$FILE" 2>/dev/null || warn "Failed to restore permissions: $FILE"
# Restore ACLs on Linux. # Restore ACLs on Linux.
[[ "$PLATFORM" == "Linux" ]] && { if [[ "$PLATFORM" == "Linux" ]]; then
printf "%s" "${DB_ACLS[$ID]}" | base64 -d 2>/dev/null | setfacl -M - "$FILE" 2>/dev/null || warn "Failed to restore ACL: $FILE" touch -m --date="$(date --date="19700101 00:00:00 + ${DB_MTIMES[$ID]} seconds" +'%Y/%m/%d %H:%M:%S.%N' 2>/dev/null)" -- "$FILE" 2>/dev/null || \
} warn "Failed to restore mtime: $FILE"
touch -a --date="$(date --date="19700101 00:00:00 + ${DB_ATIMES[$ID]} seconds" +'%Y/%m/%d %H:%M:%S.%N' 2>/dev/null)" -- "$FILE" 2>/dev/null || \
warn "Failed to restore atime: $FILE"
printf "%s" "${DB_ACLS[$ID]}" | base64 -d 2>/dev/null | setfacl -M - -- "$FILE" 2>/dev/null || warn "Failed to restore ACLs: $FILE"
elif [[ "$PLATFORM" == "Darwin" ]]; then
touch -m -d "$(date -j -r "${DB_MTIMES[$ID]%.*}" +"%Y-%m-%dT%H:%M:%S.${DB_MTIMES[$ID]#*.}")" -- "$FILE" 2>/dev/null || \
warn "Failed to restore mtime: $FILE"
touch -a -d "$(date -j -r "${DB_MTIMES[$ID]%.*}" +"%Y-%m-%dT%H:%M:%S.${DB_MTIMES[$ID]#*.}")" -- "$FILE" 2>/dev/null || \
warn "Failed to restore atime: $FILE"
fi
(( COUNT++ )) (( COUNT++ ))
done < <(printf "%s\\n" "${!DB_OWNERSHIPS[@]}") done < <(printf "%s\\n" "${!DB_OWNERSHIPS[@]}")