[Libguestfs] [PATCH 07/13] fish: edit: bring backup extension to file editing w/ editor

Bring the backup extension feature from the perl-like file mode implementation, although currently not making use of it. --- fish/edit.c | 2 +- fish/file-edit.c | 31 ++++++++++++++++++++++++++++++- fish/file-edit.h | 4 +++- 3 files changed, 34 insertions(+), 3 deletions(-) diff --git a/fish/edit.c b/fish/edit.c index 5b851e7..0170daf 100644 --- a/fish/edit.c +++ b/fish/edit.c @@ -58,7 +58,7 @@ run_edit (const char *cmd, size_t argc, char *argv[]) if (remotefilename == NULL) return -1; - r = edit_file_editor (g, remotefilename, editor); + r = edit_file_editor (g, remotefilename, editor, NULL); return r; } diff --git a/fish/file-edit.c b/fish/file-edit.c index 408d20e..8efa452 100644 --- a/fish/file-edit.c +++ b/fish/file-edit.c @@ -35,9 +35,12 @@ #include "guestfs-internal-frontend.h" static char *generate_random_name (const char *filename); +static char *generate_backup_name (const char *filename, + const char *backup_extension); int -edit_file_editor (guestfs_h *g, const char *filename, const char *editor) +edit_file_editor (guestfs_h *g, const char *filename, const char *editor, + const char *backup_extension) { CLEANUP_FREE char *tmpdir = guestfs_get_tmpdir (g); CLEANUP_UNLINK_FREE char *tmpfilename = NULL; @@ -120,6 +123,17 @@ edit_file_editor (guestfs_h *g, const char *filename, const char *editor) GUESTFS_COPY_ATTRIBUTES_ALL, 1, -1) == -1) return -1; + /* Backup or overwrite the file. */ + if (backup_extension) { + CLEANUP_FREE char *backupname = NULL; + + backupname = generate_backup_name (filename, backup_extension); + if (backupname == NULL) + return -1; + + if (guestfs_mv (g, filename, backupname) == -1) + return -1; + } if (guestfs_mv (g, newname, filename) == -1) return -1; @@ -159,3 +173,18 @@ generate_random_name (const char *filename) return ret; /* caller will free */ } + +static char * +generate_backup_name (const char *filename, const char *backup_extension) +{ + char *ret; + + assert (backup_extension != NULL); + + if (asprintf (&ret, "%s%s", filename, backup_extension) == -1) { + perror ("asprintf"); + return NULL; + } + + return ret; /* caller will free */ +} diff --git a/fish/file-edit.h b/fish/file-edit.h index eff1c7d..6622b3a 100644 --- a/fish/file-edit.h +++ b/fish/file-edit.h @@ -23,10 +23,12 @@ /** * Edit 'filename' using the specified 'editor' application. + * If 'backup_extension' is not null, then a copy of 'filename' is saved + * with 'backup_extension' appended to its file name. * * Returns -1 for failure, 0 otherwise. */ extern int edit_file_editor (guestfs_h *g, const char *filename, - const char *editor); + const char *editor, const char *backup_extension); #endif -- 1.9.3